Merge branch 'new-impl'

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>org.warp</groupId>
     <artifactId>jcwdb</artifactId>
-  <version>1.0-SNAPSHOT</version>
+    <version>1.3</version>
 
     <name>jcwdb</name>
     <!-- FIXME change it to the project's website -->
@@ -14,10 +14,18 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.source>10</maven.compiler.source>
-    <maven.compiler.target>11</maven.compiler.target>
+        <maven.compiler.target>10</maven.compiler.target>
     </properties>
 
+    <repositories>
+        <repository>
+            <id>sonatype-snapshots</id>
+            <name>sonatype snapshots repo</name>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+        </repository>
+    </repositories>
+
     <dependencies>
         <dependency>
             <groupId>junit</groupId>
@@ -40,6 +48,18 @@
             <artifactId>zero-allocation-hashing</artifactId>
             <version>0.8</version>
         </dependency>
+        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.5</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains</groupId>
+            <artifactId>annotations</artifactId>
+            <version>RELEASE</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 
     <build>

src/main/java/org/warp/cowdb/BlockInfo.java

@@ -0,0 +1,44 @@
+package org.warp.cowdb;
+
+import java.util.Objects;
+import java.util.StringJoiner;
+
+public class BlockInfo {
+	private final long index;
+	private final int size;
+
+	public BlockInfo(long index, int size) {
+		this.index = index;
+		this.size = size;
+	}
+
+	public long getIndex() {
+		return index;
+	}
+
+	public int getSize() {
+		return size;
+	}
+
+	@Override
+	public boolean equals(Object o) {
+		if (this == o) return true;
+		if (o == null || getClass() != o.getClass()) return false;
+		BlockInfo blockInfo = (BlockInfo) o;
+		return index == blockInfo.index &&
+						size == blockInfo.size;
+	}
+
+	@Override
+	public int hashCode() {
+		return Objects.hash(index, size);
+	}
+
+	@Override
+	public String toString() {
+		return new StringJoiner(", ", BlockInfo.class.getSimpleName() + "[", "]")
+						.add("index=" + index)
+						.add("size=" + size)
+						.toString();
+	}
+}

src/main/java/org/warp/cowdb/ByteBufferBackedInputStream.java

@@ -0,0 +1,33 @@
+package org.warp.cowdb;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+
+public class ByteBufferBackedInputStream extends InputStream {
+
+	ByteBuffer buf;
+
+	public ByteBufferBackedInputStream(ByteBuffer buf) {
+		this.buf = buf;
+	}
+
+	public int read() throws IOException {
+		if (!buf.hasRemaining()) {
+			return -1;
+		}
+		return buf.get() & 0xFF;
+	}
+
+	public int read(byte[] bytes, int off, int len)
+					throws IOException {
+		if (!buf.hasRemaining()) {
+			return -1;
+		}
+
+		len = Math.min(len, buf.remaining());
+		buf.get(bytes, off, len);
+		return len;
+
+	}
+}

src/main/java/org/warp/cowdb/Database.java

@@ -0,0 +1,906 @@
+package org.warp.cowdb;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.io.ByteBufferInput;
+import com.esotericsoftware.kryo.io.ByteBufferInputStream;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+import it.unimi.dsi.fastutil.booleans.BooleanArrayList;
+import it.unimi.dsi.fastutil.bytes.ByteArrayList;
+import it.unimi.dsi.fastutil.chars.CharArrayList;
+import it.unimi.dsi.fastutil.ints.IntArrayList;
+import it.unimi.dsi.fastutil.longs.LongArrayList;
+import it.unimi.dsi.fastutil.shorts.ShortArrayList;
+import org.apache.commons.lang3.reflect.FieldUtils;
+import org.warp.jcwdb.ann.*;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOError;
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.nio.ByteBuffer;
+import java.nio.channels.SeekableByteChannel;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import java.util.*;
+import java.util.function.Supplier;
+
+import static org.warp.cowdb.IBlocksMetadata.EMPTY_BLOCK_ID;
+import static org.warp.cowdb.IBlocksMetadata.EMPTY_BLOCK_INFO;
+
+public class Database implements IDatabase {
+
+	private final DatabaseFileIO fileIO;
+	private final DatabaseBlocksIO blocksIO;
+	private final DatabaseBlocksMetadata blocksMetadata;
+	private final DatabaseReferencesIO referencesIO;
+	private final DatabaseReferencesMetadata referencesMetadata;
+	private final DatabaseObjectsIO objectsIO;
+	private final DatabaseDataInitializer dataInitializer;
+	private EnhancedObject loadedRootObject;
+
+	public Database(Path dataFile, Path blocksMetaFile, Path referencesMetaFile) throws IOException {
+		if (Files.notExists(dataFile)) {
+			Files.createFile(dataFile);
+		}
+		if (Files.notExists(blocksMetaFile)) {
+			Files.createFile(blocksMetaFile);
+		}
+		if (Files.notExists(referencesMetaFile)) {
+			Files.createFile(referencesMetaFile);
+		}
+		this.fileIO = new DatabaseFileIO(dataFile);
+		this.blocksMetadata = new DatabaseBlocksMetadata(blocksMetaFile);
+		this.blocksIO = new DatabaseBlocksIO(fileIO, blocksMetadata);
+		this.referencesMetadata = new DatabaseReferencesMetadata(referencesMetaFile);
+		this.referencesIO = new DatabaseReferencesIO(blocksIO, referencesMetadata);
+		this.objectsIO = new DatabaseObjectsIO(this, referencesIO);
+		this.dataInitializer = new DatabaseDataInitializer(objectsIO);
+	}
+
+	@Override
+	public IDataInitializer getDataInitializer() {
+		return dataInitializer;
+	}
+
+	@Override
+	public IObjectsIO getObjectsIO() {
+		return objectsIO;
+	}
+
+	@Override
+	public void close() throws IOException {
+		this.objectsIO.setEnhancedObject(0, loadedRootObject);
+		this.referencesMetadata.close();
+		this.blocksMetadata.close();
+		this.fileIO.close();
+	}
+
+	public <T extends EnhancedObject> T loadRoot(Class<T> type) throws IOException {
+		return loadRoot(type, () -> {
+			T obj = objectsIO.instantiateEnhancedObject(type);
+			dataInitializer.initializeDBObject(obj);
+			return obj;
+		});
+	}
+
+	public <T extends EnhancedObject> T loadRoot(Class<T> type, SupplierWithIO<T> ifAbsent) throws IOException {
+		if (loadedRootObject != null) {
+			throw new RuntimeException("Root already set!");
+		}
+		T root;
+		if (referencesMetadata.firstFreeReference > 0) {
+			root = objectsIO.loadEnhancedObject(0, type);
+		} else {
+			if (objectsIO.newNullObject() != 0) {
+				throw new IOException("Can't allocate root!");
+			} else {
+				root = ifAbsent.getWithIO();
+				objectsIO.setEnhancedObject(0, root);
+			}
+		}
+		loadedRootObject = root;
+		return root;
+	}
+
+	protected void registerClass(Class<?> type, int id) {
+		this.objectsIO.registerClass(type, id);
+	}
+
+	public static class DatabaseDataInitializer implements IDataInitializer {
+
+		private final DatabaseObjectsIO objectsIO;
+
+		public DatabaseDataInitializer(DatabaseObjectsIO objectsIO) {
+			this.objectsIO = objectsIO;
+		}
+
+		@Override
+		public void initializeDBObject(EnhancedObject obj) throws IOException {
+			initializeDBObjectFields(obj);
+			initializeDBObjectProperties(obj);
+			obj.initialize();
+		}
+
+		private void initializeDBObjectFields(EnhancedObject obj) throws IOException {
+			// Declare the variables needed to get the biggest field Id
+			Field[] unorderedFields = objectsIO.getFields(obj);
+			// Find the biggest field Id
+			int biggestFieldId = objectsIO.getBiggestFieldId(unorderedFields);
+
+			// Allocate new UIDs
+			long[] fieldUIDs = objectsIO.allocateNewUIDs(biggestFieldId + 1);
+
+			// Declare the other variables
+			Field[] fields = new Field[biggestFieldId + 1];
+			DBDataType[] orderedFieldTypes = new DBDataType[biggestFieldId + 1];
+
+			// Load all fields metadata and load them
+			for (Field field : unorderedFields) {
+				DBField fieldAnnotation = field.getAnnotation(DBField.class);
+				int fieldId = fieldAnnotation.id();
+				DBDataType fieldType = fieldAnnotation.type();
+				objectsIO.loadField(obj, field, fieldType, fieldUIDs[fieldId]);
+				fields[fieldId] = field;
+				orderedFieldTypes[fieldId] = fieldType;
+			}
+			// Set fields metadata
+			obj.setFields(fields, orderedFieldTypes, fieldUIDs);
+		}
+
+		private void initializeDBObjectProperties(EnhancedObject obj) throws IOException {
+			// Declare the variables needed to get the biggest property Id
+			Method[] unorderedPropertyGetters = obj.getPropertyGetters();
+			Method[] unorderedPropertySetters = obj.getPropertySetters();
+
+			// Find the biggest property Id
+			int biggestGetter = objectsIO.getBiggestPropertyGetterId(unorderedPropertyGetters);
+			int biggestSetter = objectsIO.getBiggestPropertySetterId(unorderedPropertySetters);
+			int biggestPropertyId = biggestGetter > biggestSetter ? biggestGetter : biggestSetter;
+
+			// Allocate new UIDs
+			long[] propertyUIDs = objectsIO.allocateNewUIDs(biggestPropertyId + 1);
+
+			for (Method property : unorderedPropertySetters) {
+				DBPropertySetter fieldAnnotation = property.getAnnotation(DBPropertySetter.class);
+				int propertyId = fieldAnnotation.id();
+				if (propertyId > biggestPropertyId) {
+					biggestPropertyId = propertyId;
+				}
+			}
+
+			// Declare the other variables
+			DBDataType[] propertyTypes = new DBDataType[biggestPropertyId + 1];
+			Method[] propertyGetters = new Method[biggestPropertyId + 1];
+			Method[] propertySetters = new Method[biggestPropertyId + 1];
+			Map<String, DBPropertySetter> setterMethods = new LinkedHashMap<>();
+			Map<String, DBPropertyGetter> getterMethods = new LinkedHashMap<>();
+
+			// Load the properties metadata
+			for (Method property : unorderedPropertyGetters) {
+				DBPropertyGetter propertyAnnotation = property.getAnnotation(DBPropertyGetter.class);
+				int propertyId = propertyAnnotation.id();
+				DBDataType propertyType = propertyAnnotation.type();
+				propertyTypes[propertyId] = propertyType;
+				propertyGetters[propertyId] = property;
+				getterMethods.put(property.getName(), propertyAnnotation);
+			}
+			for (Method property : unorderedPropertySetters) {
+				DBPropertySetter propertyAnnotation = property.getAnnotation(DBPropertySetter.class);
+				int propertyId = propertyAnnotation.id();
+				DBDataType propertyType = propertyAnnotation.type();
+				propertyTypes[propertyId] = propertyType;
+				propertySetters[propertyId] = property;
+				setterMethods.put(property.getName(), propertyAnnotation);
+			}
+			// Set properties metadata
+			obj.setProperties(propertyGetters, propertySetters, propertyTypes, propertyUIDs, setterMethods, getterMethods);
+		}
+	}
+
+	public static class DatabaseObjectsIO implements IObjectsIO {
+
+		private final IDatabase database;
+		private final DatabaseReferencesIO referencesIO;
+
+		private Kryo kryo = new Kryo();
+
+		private DatabaseObjectsIO(IDatabase database, DatabaseReferencesIO referencesIO) {
+			this.database = database;
+			this.referencesIO = referencesIO;
+			kryo.setRegistrationRequired(false);
+			int id = -90;
+			registerClass(boolean[].class, id++);
+			registerClass(byte[].class, id++);
+			registerClass(short[].class, id++);
+			registerClass(char[].class, id++);
+			registerClass(int[].class, id++);
+			registerClass(long[].class, id++);
+			registerClass(Boolean[].class, id++);
+			registerClass(Byte[].class, id++);
+			registerClass(Short[].class, id++);
+			registerClass(Character[].class, id++);
+			registerClass(Integer[].class, id++);
+			registerClass(Long[].class, id++);
+			registerClass(String.class, id++);
+			registerClass(String[].class, id++);
+			registerClass(Boolean.class, id++);
+			registerClass(Byte.class, id++);
+			registerClass(Short.class, id++);
+			registerClass(Character.class, id++);
+			registerClass(Integer.class, id++);
+			registerClass(Class.class, id++);
+			registerClass(Object.class, id++);
+			registerClass(Object[].class, id++);
+			registerClass(Long.class, id++);
+			registerClass(String.class, id++);
+			registerClass(String[].class, id++);
+			registerClass(boolean[][].class, id++);
+			registerClass(byte[][].class, id++);
+			registerClass(short[][].class, id++);
+			registerClass(char[][].class, id++);
+			registerClass(int[][].class, id++);
+			registerClass(long[][].class, id++);
+			registerClass(String[][].class, id++);
+			registerClass(List.class, id++);
+			registerClass(ArrayList.class, id++);
+			registerClass(LinkedList.class, id++);
+			registerClass(Set.class, id++);
+			registerClass(HashSet.class, id++);
+			registerClass(LinkedHashSet.class, id++);
+			registerClass(Map.class, id++);
+			registerClass(HashMap.class, id++);
+			registerClass(LinkedHashMap.class, id++);
+			registerClass(TreeMap.class, id++);
+			registerClass(BooleanArrayList.class, id++);
+			registerClass(ByteArrayList.class, id++);
+			registerClass(ShortArrayList.class, id++);
+			registerClass(CharArrayList.class, id++);
+			registerClass(IntArrayList.class, id++);
+			registerClass(LongArrayList.class, id++);
+			registerClass(TreeSet.class, id++);
+			registerClass(SortedSet.class, id++);
+			registerClass(SortedMap.class, id++);
+		}
+
+		@Override
+		public <T extends EnhancedObject> T loadEnhancedObject(long reference, Class<T> objectType) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return null;
+			}
+			int fieldsCount = buffer.getInt();
+			int methodsCount = buffer.getInt();
+			long[] fieldRefs = new long[fieldsCount];
+			long[] methodRefs = new long[methodsCount];
+			for (int i = 0; i < fieldsCount; i++) {
+				fieldRefs[i] = buffer.getLong();
+			}
+			for (int i = 0; i < methodsCount; i++) {
+				methodRefs[i] = buffer.getLong();
+			}
+			return preloadEnhancedObject(objectType, fieldRefs, methodRefs);
+		}
+
+
+		@SuppressWarnings("unchecked")
+		private Object loadData(DBDataType propertyType, long dataReference, Supplier<Class<?>> returnType) throws IOException {
+			switch (propertyType) {
+				case DATABASE_OBJECT:
+					return loadEnhancedObject(dataReference, (Class<? extends EnhancedObject>) returnType.get());
+				case OBJECT:
+					return loadObject(dataReference);
+				case REFERENCES_LIST:
+					return loadReferencesList(dataReference);
+				case BOOLEAN:
+					return loadBoolean(dataReference);
+				case BYTE:
+					return loadByte(dataReference);
+				case SHORT:
+					return loadShort(dataReference);
+				case CHAR:
+					return loadChar(dataReference);
+				case INTEGER:
+					return loadInt(dataReference);
+				case LONG:
+					return loadLong(dataReference);
+				default:
+					throw new NullPointerException("Unknown data type");
+			}
+		}
+
+		private <T> void setData(long reference, DBDataType propertyType, T loadedPropertyValue) throws IOException {
+			switch (propertyType) {
+				case BOOLEAN:
+					setBoolean(reference, loadedPropertyValue != null && (boolean) loadedPropertyValue);
+					break;
+				case BYTE:
+					setByte(reference, loadedPropertyValue == null ? 0 : (byte) loadedPropertyValue);
+					break;
+				case SHORT:
+					setShort(reference, loadedPropertyValue == null ? 0 : (short) loadedPropertyValue);
+					break;
+				case CHAR:
+					setChar(reference, loadedPropertyValue == null ? 0 : (char) loadedPropertyValue);
+					break;
+				case INTEGER:
+					setInt(reference, loadedPropertyValue == null ? 0 : (int) loadedPropertyValue);
+					break;
+				case LONG:
+					setLong(reference, loadedPropertyValue == null ? 0 : (long) loadedPropertyValue);
+					break;
+				case OBJECT:
+					setObject(reference, loadedPropertyValue);
+					break;
+				case REFERENCES_LIST:
+					setReferencesList(reference, (LongArrayList) loadedPropertyValue);
+					break;
+				case DATABASE_OBJECT:
+					setEnhancedObject(reference, (EnhancedObject) loadedPropertyValue);
+					break;
+			}
+		}
+
+		@Override
+		public <T extends EnhancedObject> void setEnhancedObject(long reference, T value) throws IOException {
+			if (value != null) {
+				EnhancedObjectFullInfo objectFullInfo = value.getAllInfo();
+				int totalSize = Integer.BYTES * 2 + objectFullInfo.getFieldReferences().length * Long.BYTES + objectFullInfo.getPropertyReferences().length * Long.BYTES;
+				ByteBuffer buffer = ByteBuffer.allocate(totalSize);
+				buffer.putInt(objectFullInfo.getFieldReferences().length);
+				buffer.putInt(objectFullInfo.getPropertyReferences().length);
+				for (int i = 0; i < objectFullInfo.getFieldReferences().length; i++) {
+					buffer.putLong(objectFullInfo.getFieldReferences()[i]);
+				}
+				for (int i = 0; i < objectFullInfo.getPropertyReferences().length; i++) {
+					buffer.putLong(objectFullInfo.getPropertyReferences()[i]);
+				}
+				for (int i = 0; i < objectFullInfo.getFieldReferences().length; i++) {
+					try {
+						setData(objectFullInfo.getFieldReferences()[i], objectFullInfo.getFieldTypes()[i], objectFullInfo.getFields()[i].get(value));
+					} catch (IllegalAccessException e) {
+						throw new IOException(e);
+					}
+				}
+				for (int i = 0; i < objectFullInfo.getPropertyReferences().length; i++) {
+					setData(objectFullInfo.getPropertyReferences()[i], objectFullInfo.getPropertyTypes()[i], objectFullInfo.getLoadedPropertyValues()[i]);
+				}
+				buffer.flip();
+				referencesIO.writeToReference(reference, totalSize, buffer);
+			} else {
+				referencesIO.writeToReference(reference, 0, null);
+			}
+		}
+
+		@SuppressWarnings("unchecked")
+		@Override
+		public <T> T loadObject(long reference) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return null;
+			}
+			buffer.rewind();
+			byte[] data = buffer.array();
+			return (T) kryo.readClassAndObject(new Input(data));
+		}
+
+		@Override
+		public LongArrayList loadReferencesList(long reference) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return null;
+			}
+			int itemsCount = buffer.getInt();
+			LongArrayList arrayList = new LongArrayList();
+			for (int i = 0; i < itemsCount; i++) {
+				arrayList.add(buffer.getLong());
+			}
+			return arrayList;
+		}
+
+		@Override
+		public boolean loadBoolean(long reference) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return false;
+			}
+			return buffer.get() == 1;
+		}
+
+		@Override
+		public byte loadByte(long reference) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return 0;
+			}
+			return buffer.get();
+		}
+
+		@Override
+		public short loadShort(long reference) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return 0;
+			}
+			return buffer.getShort();
+		}
+
+		@Override
+		public char loadChar(long reference) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return 0;
+			}
+			return buffer.getChar();
+		}
+
+		@Override
+		public int loadInt(long reference) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return 0;
+			}
+			return buffer.getInt();
+		}
+
+		@Override
+		public long loadLong(long reference) throws IOException {
+			ByteBuffer buffer = referencesIO.readFromReference(reference);
+			if (buffer.limit() == 0) {
+				return 0;
+			}
+			return buffer.getLong();
+		}
+
+		@Override
+		public <T> void setObject(long reference, T value) throws IOException {
+			if (value != null) {
+				ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+				Output output = new Output(outputStream);
+				kryo.writeClassAndObject(output, value);
+				output.flush();
+				byte[] data = outputStream.toByteArray();
+				ByteBuffer dataByteBuffer = ByteBuffer.wrap(data);
+				referencesIO.writeToReference(reference, data.length, dataByteBuffer);
+			} else {
+				referencesIO.writeToReference(reference, 0, null);
+			}
+		}
+
+		@Override
+		public void setReferencesList(long reference, LongArrayList value) throws IOException {
+			if (value != null) {
+				int items = value.size();
+				ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES * items + Integer.BYTES);
+				buffer.putInt(items);
+				for (int i = 0; i < items; i++) {
+					buffer.putLong(value.getLong(i));
+				}
+				buffer.flip();
+				referencesIO.writeToReference(reference, buffer.limit(), buffer);
+			} else {
+				referencesIO.writeToReference(reference, 0, null);
+			}
+		}
+
+		@Override
+		public void setBoolean(long reference, boolean value) throws IOException {
+			ByteBuffer buffer = ByteBuffer.allocate(Byte.BYTES);
+			buffer.put(value ? (byte) 1 : (byte) 0);
+			buffer.flip();
+			referencesIO.writeToReference(reference, Byte.BYTES, buffer);
+		}
+
+		@Override
+		public void setByte(long reference, byte value) throws IOException {
+			ByteBuffer buffer = ByteBuffer.allocate(Byte.BYTES);
+			buffer.put(value);
+			buffer.flip();
+			referencesIO.writeToReference(reference, Byte.BYTES, buffer);
+		}
+
+		@Override
+		public void setShort(long reference, short value) throws IOException {
+			ByteBuffer buffer = ByteBuffer.allocate(Short.BYTES);
+			buffer.putShort(value);
+			buffer.flip();
+			referencesIO.writeToReference(reference, Short.BYTES, buffer);
+		}
+
+		@Override
+		public void setChar(long reference, char value) throws IOException {
+			ByteBuffer buffer = ByteBuffer.allocate(Character.BYTES);
+			buffer.putChar(value);
+			buffer.flip();
+			referencesIO.writeToReference(reference, Character.BYTES, buffer);
+		}
+
+		@Override
+		public void setInt(long reference, int value) throws IOException {
+			ByteBuffer buffer = ByteBuffer.allocate(Integer.BYTES);
+			buffer.putInt(value);
+			buffer.flip();
+			referencesIO.writeToReference(reference, Integer.BYTES, buffer);
+		}
+
+		@Override
+		public void setLong(long reference, long value) throws IOException {
+			ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
+			buffer.putLong(value);
+			buffer.flip();
+			referencesIO.writeToReference(reference, Long.BYTES, buffer);
+		}
+
+		@Override
+		public long newNullObject() throws IOException {
+			return referencesIO.allocateReference();
+		}
+
+		@Override
+		public void loadProperty(EnhancedObject obj, int propertyId, Method property, DBDataType propertyType, long propertyUID) throws IOException {
+			obj.setProperty(propertyId, loadData(propertyType, propertyUID, property::getReturnType));
+		}
+
+		@Override
+		public void registerClass(Class<?> type, int id) {
+			if (id < -100) {
+				throw new IllegalArgumentException();
+			}
+			kryo.register(type, 100 + id);
+		}
+
+		private <T extends EnhancedObject> void preloadEnhancedObjectProperties(T obj, long[] propertyReferences) {
+			// Declare the variables needed to get the biggest property Id
+			Method[] unorderedPropertyGetters = obj.getPropertyGetters();
+			Method[] unorderedPropertySetters = obj.getPropertySetters();
+
+			// Find the biggest property Id
+			int biggestGetter = getBiggestPropertyGetterId(unorderedPropertyGetters);
+			int biggestSetter = getBiggestPropertySetterId(unorderedPropertySetters);
+			int biggestPropertyId = biggestGetter > biggestSetter ? biggestGetter : biggestSetter;
+
+			for (Method property : unorderedPropertySetters) {
+				DBPropertySetter fieldAnnotation = property.getAnnotation(DBPropertySetter.class);
+				int propertyId = fieldAnnotation.id();
+				if (propertyId > biggestPropertyId) {
+					biggestPropertyId = propertyId;
+				}
+			}
+
+			// Declare the other variables
+			DBDataType[] propertyTypes = new DBDataType[biggestPropertyId + 1];
+			Method[] propertyGetters = new Method[biggestPropertyId + 1];
+			Method[] propertySetters = new Method[biggestPropertyId + 1];
+			Map<String, DBPropertySetter> setterMethods = new LinkedHashMap<>();
+			Map<String, DBPropertyGetter> getterMethods = new LinkedHashMap<>();
+
+			// Load the properties metadata
+			for (Method property : unorderedPropertyGetters) {
+				DBPropertyGetter propertyAnnotation = property.getAnnotation(DBPropertyGetter.class);
+				int propertyId = propertyAnnotation.id();
+				DBDataType propertyType = propertyAnnotation.type();
+				propertyTypes[propertyId] = propertyType;
+				propertyGetters[propertyId] = property;
+				getterMethods.put(property.getName(), propertyAnnotation);
+			}
+			for (Method property : unorderedPropertySetters) {
+				DBPropertySetter propertyAnnotation = property.getAnnotation(DBPropertySetter.class);
+				int propertyId = propertyAnnotation.id();
+				DBDataType propertyType = propertyAnnotation.type();
+				propertyTypes[propertyId] = propertyType;
+				propertySetters[propertyId] = property;
+				setterMethods.put(property.getName(), propertyAnnotation);
+			}
+			// Set properties metadata
+			obj.setProperties(propertyGetters, propertySetters, propertyTypes, propertyReferences, setterMethods, getterMethods);
+		}
+
+		private int getBiggestPropertyGetterId(Method[] unorderedPropertyGetters) {
+			int biggestPropertyId = -1;
+			for (Method property : unorderedPropertyGetters) {
+				DBPropertyGetter fieldAnnotation = property.getAnnotation(DBPropertyGetter.class);
+				int propertyId = fieldAnnotation.id();
+				if (propertyId > biggestPropertyId) {
+					biggestPropertyId = propertyId;
+				}
+			}
+			return biggestPropertyId;
+		}
+
+		private int getBiggestPropertySetterId(Method[] unorderedPropertySetters) {
+			int biggestPropertyId = -1;
+			for (Method property : unorderedPropertySetters) {
+				DBPropertySetter fieldAnnotation = property.getAnnotation(DBPropertySetter.class);
+				int propertyId = fieldAnnotation.id();
+				if (propertyId > biggestPropertyId) {
+					biggestPropertyId = propertyId;
+				}
+			}
+			return biggestPropertyId;
+		}
+
+		private <T extends EnhancedObject> void preloadEnhancedObjectFields(T obj, long[] fieldReferences) throws IOException {
+			// Declare the variables needed to get the biggest field Id
+			Field[] unorderedFields = getFields(obj);
+			// Find the biggest field Id
+			int biggestFieldId = getBiggestFieldId(unorderedFields);
+
+			// Declare the other variables
+			Field[] fields = new Field[biggestFieldId + 1];
+			DBDataType[] orderedFieldTypes = new DBDataType[biggestFieldId + 1];
+
+			// Load all fields metadata and load them
+			for (Field field : unorderedFields) {
+				DBField fieldAnnotation = field.getAnnotation(DBField.class);
+				int fieldId = fieldAnnotation.id();
+				DBDataType fieldType = fieldAnnotation.type();
+				loadField(obj, field, fieldType, fieldReferences[fieldId]);
+				fields[fieldId] = field;
+				orderedFieldTypes[fieldId] = fieldType;
+			}
+			// Set fields metadata
+			obj.setFields(fields, orderedFieldTypes, fieldReferences);
+		}
+
+		private <T extends EnhancedObject> void loadField(T obj, Field field, DBDataType fieldType, long fieldReference) throws IOException {
+			Object data = loadData(fieldType, fieldReference, field::getType);
+			try {
+				if (fieldType == DBDataType.OBJECT && data != null) {
+					if (!field.getType().isInstance(data)) {
+						throw new IOException("There is an attempt to load an object of type " + data.getClass() + " into a field of type " + field.getType());
+					}
+				}
+				FieldUtils.writeField(field, obj, data, true);
+			} catch (IllegalAccessException e) {
+				throw new RuntimeException(e);
+			}
+		}
+
+		private <T extends EnhancedObject> Field[] getFields(T obj) {
+			return FieldUtils.getFieldsWithAnnotation(obj.getClass(), DBField.class);
+		}
+
+		private int getBiggestFieldId(Field[] unorderedFields) {
+			int biggestFieldId = -1;
+			for (Field field : unorderedFields) {
+				DBField fieldAnnotation = field.getAnnotation(DBField.class);
+				int propertyId = fieldAnnotation.id();
+				if (propertyId > biggestFieldId) {
+					biggestFieldId = propertyId;
+				}
+			}
+			return biggestFieldId;
+		}
+
+		private <T extends EnhancedObject> T instantiateEnhancedObject(Class<T> type) throws IOException {
+			try {
+				T obj = type.getConstructor().newInstance();
+				obj.database = database;
+				return obj;
+			} catch (NoSuchMethodException e) {
+				throw new IOException("You must declare a public empty constructor in class " + type + ": public " + type.getSimpleName() + "()", e);
+			} catch (IllegalAccessException | InvocationTargetException | InstantiationException e) {
+				throw new IOException(e);
+			}
+		}
+
+		private <T extends EnhancedObject> T preloadEnhancedObject(Class<T> objectType, long[] fieldRefs, long[] methodRefs) throws IOException {
+			T obj = instantiateEnhancedObject(objectType);
+			preloadEnhancedObjectFields(obj, fieldRefs);
+			preloadEnhancedObjectProperties(obj, methodRefs);
+			return obj;
+		}
+
+		public long[] allocateNewUIDs(int quantity) throws IOException {
+			long[] ids = new long[quantity];
+			for (int i = 0; i < quantity; i++) {
+				ids[i] = newNullObject();
+			}
+			return ids;
+		}
+	}
+
+	public static class DatabaseReferencesIO implements IReferencesIO {
+
+		private final DatabaseBlocksIO blocksIO;
+		private final DatabaseReferencesMetadata referencesMetadata;
+
+		public DatabaseReferencesIO(DatabaseBlocksIO blocksIO, DatabaseReferencesMetadata referencesMetadata) {
+			this.blocksIO = blocksIO;
+			this.referencesMetadata = referencesMetadata;
+		}
+
+		@Override
+		public long allocateReference() throws IOException {
+			return referencesMetadata.newReference(EMPTY_BLOCK_ID);
+		}
+
+		@Override
+		public long allocateReference(int size, ByteBuffer data) throws IOException {
+			long blockId = (size == 0) ? EMPTY_BLOCK_ID : blocksIO.newBlock(size, data);
+			return referencesMetadata.newReference(blockId);
+		}
+
+		@Override
+		public void writeToReference(long reference, int size, ByteBuffer data) throws IOException {
+			long blockId = (size == 0) ? EMPTY_BLOCK_ID : blocksIO.newBlock(size, data);
+			referencesMetadata.editReference(reference, blockId);
+		}
+
+		@Override
+		public ByteBuffer readFromReference(long reference) throws IOException {
+			long blockId = referencesMetadata.getReference(reference);
+			return blocksIO.readBlock(blockId);
+		}
+	}
+
+	public static class DatabaseReferencesMetadata implements IReferencesMetadata {
+		private final SeekableByteChannel metaFileChannel;
+		private final int REF_META_BYTES_COUNT = Long.BYTES;
+		private long firstFreeReference;
+
+		private DatabaseReferencesMetadata(Path refMetaFile) throws IOException {
+			metaFileChannel = Files.newByteChannel(refMetaFile, StandardOpenOption.READ, StandardOpenOption.WRITE);
+			firstFreeReference = metaFileChannel.size() / REF_META_BYTES_COUNT;
+		}
+
+		@Override
+		public long getReference(long reference) throws IOException {
+			ByteBuffer buffer = ByteBuffer.allocate(REF_META_BYTES_COUNT);
+			if (reference >= firstFreeReference) {
+				return EMPTY_BLOCK_ID;
+			}
+			SeekableByteChannel currentFileChannel = metaFileChannel.position(reference * REF_META_BYTES_COUNT);
+			currentFileChannel.read(buffer);
+			buffer.flip();
+			return buffer.getLong();
+		}
+
+		@Override
+		public long newReference(long blockId) throws IOException {
+			long newReference = firstFreeReference++;
+			editReference(newReference, blockId);
+			return newReference;
+		}
+
+		@Override
+		public void editReference(long reference, long blockId) throws IOException {
+			ByteBuffer data = ByteBuffer.allocate(REF_META_BYTES_COUNT);
+			data.putLong(blockId);
+			SeekableByteChannel currentFileChannel = metaFileChannel.position(reference * REF_META_BYTES_COUNT);
+			data.flip();
+			currentFileChannel.write(data);
+		}
+
+		@Override
+		public void close() throws IOException {
+			metaFileChannel.close();
+		}
+	}
+
+	public static class DatabaseBlocksIO implements IBlocksIO {
+
+		private final DatabaseFileIO fileIO;
+		private final IBlocksMetadata blocksMetadata;
+
+		private DatabaseBlocksIO(DatabaseFileIO fileIO, IBlocksMetadata blocksMetadata) {
+			this.fileIO = fileIO;
+			this.blocksMetadata = blocksMetadata;
+		}
+
+		@Override
+		public long newBlock(int size, ByteBuffer data) throws IOException {
+			long index = fileIO.writeAtEnd(size, data);
+			return blocksMetadata.newBlock(index, size);
+		}
+
+		@Override
+		public ByteBuffer readBlock(long blockId) throws IOException {
+			if (blockId == EMPTY_BLOCK_ID) {
+				return ByteBuffer.wrap(new byte[0]);
+			}
+			BlockInfo blockInfo = blocksMetadata.getBlockInfo(blockId);
+			return fileIO.readAt(blockInfo.getIndex(), blockInfo.getSize());
+		}
+
+		@Override
+		public void close() {
+
+		}
+	}
+
+	public static class DatabaseBlocksMetadata implements IBlocksMetadata {
+		private final SeekableByteChannel metaFileChannel;
+		private final int BLOCK_META_BYTES_COUNT = Long.BYTES + Integer.BYTES;
+		private long firstFreeBlock;
+
+		private DatabaseBlocksMetadata(Path metaFile) throws IOException {
+			metaFileChannel = Files.newByteChannel(metaFile, StandardOpenOption.READ, StandardOpenOption.WRITE);
+			firstFreeBlock = metaFileChannel.size() / BLOCK_META_BYTES_COUNT;
+		}
+
+		@Override
+		public BlockInfo getBlockInfo(long blockId) throws IOException {
+			if (blockId == EMPTY_BLOCK_ID) {
+				return EMPTY_BLOCK_INFO;
+			}
+			ByteBuffer buffer = ByteBuffer.allocate(BLOCK_META_BYTES_COUNT);
+			metaFileChannel.position(blockId * BLOCK_META_BYTES_COUNT).read(buffer);
+			buffer.flip();
+			long index = buffer.getLong();
+			int size = buffer.getInt();
+			return new BlockInfo(index, size);
+		}
+
+		@Override
+		public long newBlock(long index, int size) throws IOException {
+			long newBlockId = firstFreeBlock++;
+			ByteBuffer data = ByteBuffer.allocate(BLOCK_META_BYTES_COUNT);
+			data.putLong(index);
+			data.putInt(size);
+			data.flip();
+			metaFileChannel.position(newBlockId * BLOCK_META_BYTES_COUNT).write(data);
+			return newBlockId;
+		}
+
+		@Override
+		public void close() throws IOException {
+			metaFileChannel.close();
+		}
+	}
+
+	public static class DatabaseFileIO implements IFileIO {
+
+		private final SeekableByteChannel dataFileChannel;
+		private final Object dataAccessLock = new Object();
+		private long firstFreeIndex;
+
+		private DatabaseFileIO(Path dataFile) throws IOException {
+			synchronized (dataAccessLock) {
+				dataFileChannel = Files.newByteChannel(dataFile, StandardOpenOption.READ, StandardOpenOption.WRITE);
+				firstFreeIndex = dataFileChannel.size();
+			}
+		}
+
+		@Override
+		public ByteBuffer readAt(long index, int length) throws IOException {
+			ByteBuffer dataBuffer = ByteBuffer.allocate(length);
+			dataFileChannel.position(index).read(dataBuffer);
+			dataBuffer.flip();
+			return dataBuffer;
+		}
+
+		@Override
+		public void writeAt(long index, int length, ByteBuffer data) throws IOException {
+			synchronized (dataAccessLock) {
+				if (data.position() != 0) {
+					throw new IOException("You didn't flip the ByteBuffer!");
+				}
+				if (firstFreeIndex < index + length) {
+					firstFreeIndex = index + length;
+				}
+				dataFileChannel.position(index).write(data);
+			}
+		}
+
+		@Override
+		public long writeAtEnd(int length, ByteBuffer data) throws IOException {
+			synchronized (dataAccessLock) {
+				long index = firstFreeIndex;
+				firstFreeIndex += length;
+				writeAt(index, length, data);
+				return index;
+			}
+		}
+
+		@Override
+		public void close() throws IOException {
+			synchronized (dataAccessLock) {
+				dataFileChannel.close();
+			}
+		}
+	}
+}

src/main/java/org/warp/cowdb/EnhancedObject.java

@@ -0,0 +1,101 @@
+package org.warp.cowdb;
+
+import org.apache.commons.lang3.reflect.MethodUtils;
+import org.warp.jcwdb.ann.DBDataType;
+import org.warp.jcwdb.ann.DBPropertyGetter;
+import org.warp.jcwdb.ann.DBPropertySetter;
+
+import java.io.IOError;
+import java.io.IOException;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.Map;
+
+public abstract class EnhancedObject {
+	protected IDatabase database;
+	private Field[] fields;
+	private DBDataType[] fieldTypes;
+	private long[] fieldReferences;
+	private Method[] propertyGetters;
+	private Method[] propertySetters;
+	private DBDataType[] propertyTypes;
+	private long[] propertyReferences;
+	private boolean[] loadedProperties;
+	private Object[] loadedPropertyValues;
+	private Map<String, DBPropertySetter> setterMethods;
+	private Map<String, DBPropertyGetter> getterMethods;
+
+	public EnhancedObject() {
+
+	}
+
+	public EnhancedObject(IDatabase database) throws IOException {
+		this.database = database;
+		database.getDataInitializer().initializeDBObject(this);
+	}
+
+	public abstract void initialize() throws IOException;
+
+
+	public void setFields(Field[] fields, DBDataType[] fieldTypes, long[] fieldReferences) {
+		this.fields = fields;
+		this.fieldTypes = fieldTypes;
+		this.fieldReferences = fieldReferences;
+	}
+
+	public Method[] getPropertyGetters() {
+		return MethodUtils.getMethodsWithAnnotation(this.getClass(), DBPropertyGetter.class);
+	}
+
+	public Method[] getPropertySetters() {
+		return MethodUtils.getMethodsWithAnnotation(this.getClass(), DBPropertySetter.class);
+	}
+
+	public void setProperties(Method[] propertyGetters, Method[] propertySetters, DBDataType[] propertyTypes, long[] propertyReferences, Map<String, DBPropertySetter> setterMethods, Map<String, DBPropertyGetter> getterMethods) {
+		this.propertyGetters = propertyGetters;
+		this.propertySetters = propertySetters;
+		this.propertyTypes = propertyTypes;
+		this.propertyReferences = propertyReferences;
+		this.loadedProperties = new boolean[this.propertyReferences.length];
+		this.loadedPropertyValues = new Object[this.propertyReferences.length];
+		this.setterMethods = setterMethods;
+		this.getterMethods = getterMethods;
+	}
+
+	public EnhancedObjectFullInfo getAllInfo() {
+		return new EnhancedObjectFullInfo(fieldReferences, fieldTypes, fields, propertyReferences, propertyTypes, loadedPropertyValues);
+	}
+
+
+	public <T> T getProperty() {
+		StackWalker walker = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
+		StackWalker.StackFrame stackFrame = walker.walk(f -> f.skip(1).findFirst().orElse(null));
+		try {
+			int propertyId = stackFrame.getDeclaringClass().getDeclaredMethod(stackFrame.getMethodName()).getAnnotation(DBPropertyGetter.class).id();
+			return getProperty(propertyId);
+		} catch (IOException | NoSuchMethodException e) {
+			throw new RuntimeException(e);
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	private <T> T getProperty(int propertyId) throws IOException {
+		if (!loadedProperties[propertyId]) {
+			long propertyUID = propertyReferences[propertyId];
+			database.getObjectsIO().loadProperty(this, propertyId, propertyGetters[propertyId], propertyTypes[propertyId], propertyUID);
+		}
+		return (T) loadedPropertyValues[propertyId];
+	}
+
+	public <T> void setProperty(T value) {
+		StackWalker walker = StackWalker.getInstance(StackWalker.Option.RETAIN_CLASS_REFERENCE);
+		StackWalker.StackFrame stackFrame = walker.walk(f -> f.skip(1).findFirst().orElse(null));
+		DBPropertySetter propertyAnnotation = setterMethods.get(stackFrame.getMethodName());
+		setProperty(propertyAnnotation.id(), value);
+	}
+
+	public <T> void setProperty(int propertyId, T value) {
+		loadedPropertyValues[propertyId] = value;
+		loadedProperties[propertyId] = true;
+	}
+}

src/main/java/org/warp/cowdb/EnhancedObjectFullInfo.java

@@ -0,0 +1,47 @@
+package org.warp.cowdb;
+
+import org.warp.jcwdb.ann.DBDataType;
+
+import java.lang.reflect.Field;
+
+public class EnhancedObjectFullInfo {
+	private final long[] fieldReferences;
+	private final DBDataType[] fieldTypes;
+	private final Field[] fields;
+	private final long[] propertyReferences;
+	private final DBDataType[] propertyTypes;
+	private final Object[] loadedPropertyValues;
+
+	EnhancedObjectFullInfo(long[] fieldReferences, DBDataType[] fieldTypes, Field[] fields, long[] propertyReferences, DBDataType[] propertyTypes, Object[] loadedPropertyValues) {
+		this.fieldReferences = fieldReferences;
+		this.fieldTypes = fieldTypes;
+		this.fields = fields;
+		this.propertyReferences = propertyReferences;
+		this.propertyTypes = propertyTypes;
+		this.loadedPropertyValues = loadedPropertyValues;
+	}
+
+	long[] getFieldReferences() {
+		return fieldReferences;
+	}
+
+	DBDataType[] getFieldTypes() {
+		return fieldTypes;
+	}
+
+	public Field[] getFields() {
+		return fields;
+	}
+
+	long[] getPropertyReferences() {
+		return propertyReferences;
+	}
+
+	DBDataType[] getPropertyTypes() {
+		return propertyTypes;
+	}
+
+	Object[] getLoadedPropertyValues() {
+		return loadedPropertyValues;
+	}
+}

src/main/java/org/warp/cowdb/IBlocksIO.java

@@ -0,0 +1,28 @@
+package org.warp.cowdb;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+
+public interface IBlocksIO {
+	/**
+	 * Allocate a block
+	 * @param size block size
+	 * @param data block data
+	 * @return the block id
+	 */
+	long newBlock(int size, ByteBuffer data) throws IOException;
+
+	/**
+	 * Read a block
+	 * @param blockId block id
+	 * @return block data
+	 */
+	ByteBuffer readBlock(long blockId) throws IOException;
+
+	/**
+	 * Close file
+	 */
+	void close();
+}

src/main/java/org/warp/cowdb/IBlocksMetadata.java

@@ -0,0 +1,44 @@
+package org.warp.cowdb;
+
+import java.io.IOException;
+
+public interface IBlocksMetadata {
+	long EMPTY_BLOCK_ID = -1;
+	BlockInfo EMPTY_BLOCK_INFO = new BlockInfo(0, 0);
+
+	/**
+	 * Get block info
+	 * @param blockId block id
+	 * @return block metadata
+	 */
+	BlockInfo getBlockInfo(long blockId) throws IOException;
+
+	/**
+	 * New empty block info
+	 * @return block id
+	 */
+	default long newBlock() {
+		return EMPTY_BLOCK_ID;
+	}
+
+	/**
+	 * Set block info
+	 * @param index block index
+	 * @param size block size
+	 * @return block id
+	 */
+	long newBlock(long index, int size) throws IOException;
+
+	/**
+	 * Set block info
+	 * @param blockInfo block info
+	 * @return block id
+	 */
+	default long newBlock(BlockInfo blockInfo) throws IOException {
+		return this.newBlock(blockInfo.getIndex(), blockInfo.getSize());
+	}
+	/**
+	 * Close file
+	 */
+	void close() throws IOException;
+}

src/main/java/org/warp/cowdb/IDataInitializer.java

@@ -0,0 +1,7 @@
+package org.warp.cowdb;
+
+import java.io.IOException;
+
+public interface IDataInitializer {
+	void initializeDBObject(EnhancedObject obj) throws IOException;
+}

src/main/java/org/warp/cowdb/IDatabase.java

@@ -0,0 +1,10 @@
+package org.warp.cowdb;
+
+import java.io.IOException;
+
+public interface IDatabase {
+
+	void close() throws IOException;
+	IDataInitializer getDataInitializer();
+	IObjectsIO getObjectsIO();
+}

src/main/java/org/warp/cowdb/IFileIO.java

@@ -0,0 +1,35 @@
+package org.warp.cowdb;
+
+import java.io.*;
+import java.nio.ByteBuffer;
+
+public interface IFileIO {
+	/**
+	 * Read *length* bytes in position *index*
+	 * @param index index
+	 * @param length length
+	 * @return bytes
+	 */
+	ByteBuffer readAt(long index, int length) throws IOException;
+
+	/**
+	 * Write *length* bytes in position *index*
+	 * @param index index
+	 * @param length length
+	 * @param data bytes
+	 */
+	void writeAt(long index, int length, ByteBuffer data) throws IOException;
+
+	/**
+	 * Write *length* bytes in position *index*
+	 * @param length length
+	 * @param data bytes
+	 * @return index
+	 */
+	long writeAtEnd(int length, ByteBuffer data) throws IOException;
+
+	/**
+	 * Close the file
+	 */
+	void close() throws IOException;
+}

src/main/java/org/warp/cowdb/IObjectsIO.java

@@ -0,0 +1,111 @@
+package org.warp.cowdb;
+
+import it.unimi.dsi.fastutil.longs.LongArrayList;
+import org.warp.jcwdb.ann.DBDataType;
+
+import java.io.IOException;
+import java.lang.reflect.Method;
+
+public interface IObjectsIO {
+	<T extends EnhancedObject> T loadEnhancedObject(long reference, Class<T> objectType) throws IOException;
+
+	<T> T loadObject(long reference) throws IOException;
+
+	LongArrayList loadReferencesList(long reference) throws IOException;
+
+	boolean loadBoolean(long reference) throws IOException;
+
+	byte loadByte(long reference) throws IOException;
+
+	short loadShort(long reference) throws IOException;
+
+	char loadChar(long reference) throws IOException;
+
+	int loadInt(long reference) throws IOException;
+
+	long loadLong(long reference) throws IOException;
+
+	<T extends EnhancedObject> void setEnhancedObject(long reference, T value) throws IOException;
+
+	<T> void setObject(long reference, T value) throws IOException;
+
+	void setReferencesList(long reference, LongArrayList value) throws IOException;
+
+	void setBoolean(long reference, boolean value) throws IOException;
+
+	void setByte(long reference, byte value) throws IOException;
+
+	void setShort(long reference, short value) throws IOException;
+
+	void setChar(long reference, char value) throws IOException;
+
+	void setInt(long reference, int value) throws IOException;
+
+	void setLong(long reference, long value) throws IOException;
+
+	long newNullObject() throws IOException;
+
+	default <T extends EnhancedObject> long newEnhancedObject(T value) throws IOException {
+		long reference = newNullObject();
+		if (value != null) {
+			setEnhancedObject(reference, value);
+		}
+		return reference;
+	}
+
+	default <T> long newObject(T value) throws IOException {
+		long reference = newNullObject();
+		if (value != null) {
+			setObject(reference, value);
+		}
+		return reference;
+	}
+
+	default long newReferencesList(LongArrayList value) throws IOException {
+		long reference = newNullObject();
+		if (value != null) {
+			setReferencesList(reference, value);
+		}
+		return reference;
+	}
+
+	default long newBoolean(boolean value) throws IOException {
+		long reference = newNullObject();
+		setBoolean(reference, value);
+		return reference;
+	}
+
+	default long newByte(byte value) throws IOException {
+		long reference = newNullObject();
+		setByte(reference, value);
+		return reference;
+	}
+
+	default long newShort(short value) throws IOException {
+		long reference = newNullObject();
+		setShort(reference, value);
+		return reference;
+	}
+
+	default long newChar(char value) throws IOException {
+		long reference = newNullObject();
+		setChar(reference, value);
+		return reference;
+	}
+
+	default long newInt(int value) throws IOException {
+		long reference = newNullObject();
+		setInt(reference, value);
+		return reference;
+	}
+
+	default long newLong(long value) throws IOException {
+		long reference = newNullObject();
+		setLong(reference, value);
+		return reference;
+	}
+
+	void loadProperty(EnhancedObject enhancedObject, int propertyId, Method propertyGetter, DBDataType propertyType, long propertyUID) throws IOException;
+
+	void registerClass(Class<?> type, int id);
+}

src/main/java/org/warp/cowdb/IReferencesIO.java

@@ -0,0 +1,37 @@
+package org.warp.cowdb;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.ByteBuffer;
+
+public interface IReferencesIO {
+	/**
+	 * Allocate a new empty reference
+	 * @return the new reference
+	 */
+	long allocateReference() throws IOException;
+
+	/**
+	 * Allocate a new reference with that data
+	 * @param size data size
+	 * @param data bytes
+	 * @return the new reference
+	 */
+	long allocateReference(int size, ByteBuffer data) throws IOException;
+
+	/**
+	 * Write some data to the reference
+	 * @param reference reference
+	 * @param size data size
+	 * @param data bytes
+	 */
+	void writeToReference(long reference, int size, ByteBuffer data) throws IOException;
+
+	/**
+	 * Read data from the reference
+	 * @param reference reference
+	 * @return bytes
+	 */
+	ByteBuffer readFromReference(long reference) throws IOException;
+}

src/main/java/org/warp/cowdb/IReferencesMetadata.java

@@ -0,0 +1,31 @@
+package org.warp.cowdb;
+
+import java.io.IOException;
+
+public interface IReferencesMetadata {
+	/**
+	 * Get block of reference
+	 * @param reference reference
+	 * @return block id
+	 */
+	long getReference(long reference) throws IOException;
+
+	/**
+	 * Allocate a block for a new reference
+	 * @param blockId block id
+	 * @return reference
+	 */
+	long newReference(long blockId) throws IOException;
+
+	/**
+	 * Change reference size
+	 * @param reference reference
+	 * @param blockId block id
+	 */
+	void editReference(long reference, long blockId) throws IOException;
+
+	/**
+	 * Close file
+	 */
+	void close() throws IOException;
+}

src/main/java/org/warp/cowdb/lists/CowList.java

@@ -0,0 +1,101 @@
+package org.warp.cowdb.lists;
+
+import it.unimi.dsi.fastutil.longs.LongArrayList;
+import org.warp.cowdb.EnhancedObject;
+import org.warp.cowdb.IDatabase;
+import org.warp.jcwdb.ann.DBDataType;
+import org.warp.jcwdb.ann.DBField;
+
+import java.io.IOException;
+import java.util.StringJoiner;
+
+public abstract class CowList<T> extends EnhancedObject {
+
+	private final Object indicesAccessLock = new Object();
+
+	@DBField(id = 0, type = DBDataType.REFERENCES_LIST)
+	private LongArrayList indices;
+
+	public CowList() {
+
+	}
+
+	public CowList(IDatabase database) throws IOException {
+		super(database);
+	}
+
+	@Override
+	public void initialize() throws IOException {
+		indices = new LongArrayList();
+	}
+
+	public T get(int index) throws IOException {
+		synchronized (indicesAccessLock) {
+			long uid = indices.getLong(index);
+			return loadItem(uid);
+		}
+	}
+
+	public void add(T value) throws IOException {
+		long uid = database.getObjectsIO().newNullObject();
+		synchronized (indicesAccessLock) {
+			indices.add(uid);
+			writeItemToDisk(uid, value);
+		}
+	}
+
+	public void update(int index, T value) throws IOException {
+		synchronized (indicesAccessLock) {
+			set(index, value);
+		}
+	}
+
+	public void set(int index, T value) throws IOException {
+		long uid = database.getObjectsIO().newNullObject();
+		synchronized (indicesAccessLock) {
+			indices.set(index, uid);
+			writeItemToDisk(uid, value);
+		}
+	}
+
+	public void add(int index, T value) throws IOException {
+		long uid = database.getObjectsIO().newNullObject();
+		synchronized (indicesAccessLock) {
+			indices.add(index, uid);
+			writeItemToDisk(uid, value);
+		}
+	}
+
+	public T getLast() throws IOException {
+		synchronized (indicesAccessLock) {
+			if (indices.size() > 0) {
+				return get(indices.size() - 1);
+			} else {
+				return null;
+			}
+		}
+	}
+
+	public boolean isEmpty() {
+		synchronized (indicesAccessLock) {
+			return indices.size() <= 0;
+		}
+	}
+
+	public int size() {
+		synchronized (indicesAccessLock) {
+			return indices.size();
+		}
+	}
+
+	protected abstract T loadItem(long uid) throws IOException;
+
+	protected abstract void writeItemToDisk(long uid, T item) throws IOException;
+
+	@Override
+	public String toString() {
+		return new StringJoiner(", ", CowList.class.getSimpleName() + "[", "]")
+						.add(indices.size() + " items")
+						.toString();
+	}
+}

src/main/java/org/warp/cowdb/lists/EnhancedObjectCowList.java

@@ -0,0 +1,33 @@
+package org.warp.cowdb.lists;
+
+import org.warp.cowdb.EnhancedObject;
+import org.warp.cowdb.IDatabase;
+import org.warp.jcwdb.ann.DBDataType;
+import org.warp.jcwdb.ann.DBField;
+
+import java.io.IOException;
+
+public class EnhancedObjectCowList<T extends EnhancedObject> extends CowList<T> {
+
+	@DBField(id = 1, type = DBDataType.OBJECT)
+	private Class<T> type;
+
+	public EnhancedObjectCowList() {
+		super();
+	}
+
+	public EnhancedObjectCowList(IDatabase database, Class<T> type) throws IOException {
+		super(database);
+		this.type = type;
+	}
+
+	@Override
+	protected T loadItem(long uid) throws IOException {
+		return database.getObjectsIO().loadEnhancedObject(uid, type);
+	}
+
+	@Override
+	protected void writeItemToDisk(long uid, T item) throws IOException {
+		database.getObjectsIO().setEnhancedObject(uid, item);
+	}
+}

src/main/java/org/warp/cowdb/lists/ObjectCowList.java

@@ -0,0 +1,29 @@
+package org.warp.cowdb.lists;
+
+import org.warp.cowdb.EnhancedObject;
+import org.warp.cowdb.IDatabase;
+import org.warp.jcwdb.ann.DBDataType;
+import org.warp.jcwdb.ann.DBField;
+
+import java.io.IOException;
+
+public class ObjectCowList<T> extends CowList<T> {
+
+	public ObjectCowList() {
+		super();
+	}
+
+	public ObjectCowList(IDatabase database) throws IOException {
+		super(database);
+	}
+
+	@Override
+	protected T loadItem(long uid) throws IOException {
+		return database.getObjectsIO().loadObject(uid);
+	}
+
+	@Override
+	protected void writeItemToDisk(long uid, T item) throws IOException {
+		database.getObjectsIO().setObject(uid, item);
+	}
+}

src/main/java/org/warp/jcwdb/CacheIndexManager.java

@@ -1,73 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.IOException;
-import java.util.function.BiConsumer;
-import java.util.function.Consumer;
-
-public class CacheIndexManager implements IndexManager {
-	
-	public CacheIndexManager() {
-	}
-
-	@Override
-	public <T> T get(long index, DBReader<T> reader) {
-		// TODO: implement
-		return null;
-	}
-
-	@Override
-	public int getType(long index) {
-		// TODO: implement
-		return 0;
-	}
-
-	@Override
-	public long getHash(long index) {
-		// TODO: implement
-		return 0;
-	}
-
-	@Override
-	public <T> long add(DBDataOutput<T> writer) {
-		// TODO: implement
-		return 0;
-	}
-
-	@Override
-	public <T>  FullIndexDetails addAndGetDetails(DBDataOutput<T> writer) {
-		// TODO: implement
-		return null;
-	}
-
-	@Override
-	public <T> IndexDetails set(long index, DBDataOutput<T> writer) {
-		// TODO: implement
-		return null;
-	}
-
-	@Override
-	public void setFlushingAllowed(long index, boolean isUnloadingAllowed) {
-		// TODO: implement
-	}
-
-	@Override
-	public void delete(long index) {
-		// TODO: implement
-	}
-
-	@Override
-	public boolean has(long index) {
-		// TODO: implement
-		return false;
-	}
-
-	@Override
-	public void close() {
-		// TODO: implement
-	}
-
-	@Override
-	public long clean() {
-		return 0;
-	}
-}

src/main/java/org/warp/jcwdb/Castable.java

@@ -1,5 +0,0 @@
-package org.warp.jcwdb;
-
-public interface Castable {
-	<T> T cast();
-}

src/main/java/org/warp/jcwdb/Cleanable.java

@@ -1,9 +0,0 @@
-package org.warp.jcwdb;
-
-public interface Cleanable {
-	/**
-	 * Clean the object
-	 * @return the approximated number of cleaned items
-	 */
-	public long clean();
-}

src/main/java/org/warp/jcwdb/Cleaner.java

@@ -1,122 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.IOException;
-import java.lang.ref.WeakReference;
-import java.nio.channels.ClosedChannelException;
-
-import it.unimi.dsi.fastutil.longs.Long2ObjectMap.Entry;
-
-public class Cleaner {
-
-	public static final boolean DISABLE_CLEANER = false;
-	public static final boolean ENABLE_CLEANER_LOGGING = false;
-	private static final double MAXIMUM_SLEEP_INTERVAL = 8d * 1000d; // 8 seconds
-	private static final double MINIMUM_SLEEP_INTERVAL = 1d * 1000d; // 1 second
-	private static final double NORMAL_REMOVED_ITEMS = 2500l;
-	private static final double REMOVED_ITEMS_RATIO = 2.5d; // 250%
-
-	private final Cleanable[] objectsToClean;
-	private final Thread cleanerThread;
-	private int sleepInterval = (int) MINIMUM_SLEEP_INTERVAL;
-	private volatile boolean stopRequest = false;
-	
-	public Cleaner(Cleanable... objectsToClean) {
-		this.objectsToClean = objectsToClean;
-		this.cleanerThread = new Thread(new CleanLoop());
-		this.cleanerThread.setName("Cleaner thread");
-		this.cleanerThread.setDaemon(true);
-	}
-
-	public void start() {
-		if (!DISABLE_CLEANER) {
-			this.cleanerThread.start();
-		}
-	}
-	
-	/**
-	 * Clean
-	 * @return number of removed items
-	 */
-	private long clean() {
-		long cleanedItems = 0;
-		for (Cleanable cleanable : objectsToClean) {
-			cleanedItems += cleanable.clean();
-		}
-		//System.gc();
-		return cleanedItems;
-	}
-
-	public void stop() {
-		if (cleanerThread != null) {
-			stopRequest = true;
-			while (cleanerThread.isAlive()) {
-				try {
-					Thread.sleep(100);
-				} catch (InterruptedException e) {
-					e.printStackTrace();
-				}
-			}
-		}
-	}
-	
-	private class CleanLoop implements Runnable {
-		
-		@Override
-		public void run() {
-			while(!stopRequest) {
-				try {
-					if (ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] Waiting " + sleepInterval + "ms.");
-					sleepFor(sleepInterval);
-					final long time1 = System.currentTimeMillis();
-					final double removedItems = clean();
-					final long time2 = System.currentTimeMillis();
-					if (ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] CLEAN_TIME " + (time2 - time1));
-					double suggestedExecutionTimeByItemsCalculations = (sleepInterval + MAXIMUM_SLEEP_INTERVAL) / 2;
-
-					if (ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] REMOVED_ITEMS: " + removedItems);
-					if (removedItems > 0) {
-						final double removedItemsRatio = removedItems / NORMAL_REMOVED_ITEMS;
-						if (ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] REMOVED_ITEMS_RATIO: " + removedItemsRatio);
-						if (removedItemsRatio < 1d / REMOVED_ITEMS_RATIO || removedItemsRatio >= REMOVED_ITEMS_RATIO) {
-							suggestedExecutionTimeByItemsCalculations = sleepInterval / removedItemsRatio;
-						}
-					}
-
-					if (ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] Items: SUGGESTING SLEEP_INTERVAL FROM " + sleepInterval + "ms TO " + suggestedExecutionTimeByItemsCalculations + "ms");
-
-					double newSleepInterval = suggestedExecutionTimeByItemsCalculations;
-					if (ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] Total: SUGGESTING SLEEP_INTERVAL FROM " + sleepInterval + "ms TO " + newSleepInterval + "ms");
-					if (newSleepInterval > MAXIMUM_SLEEP_INTERVAL) {
-						sleepInterval = (int) MAXIMUM_SLEEP_INTERVAL;
-					} else if (newSleepInterval < MINIMUM_SLEEP_INTERVAL) {
-						sleepInterval = (int) MINIMUM_SLEEP_INTERVAL;
-					} else {
-						if (ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] CHANGED SLEEP_INTERVAL FROM " + sleepInterval + "ms TO " + newSleepInterval + "ms");
-						sleepInterval = (int) newSleepInterval;
-					}
-
-
-					if (ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] Cleaned " + removedItems + " items.");
-				}catch (InterruptedException e) {
-
-				}
-			}
-		}
-
-		private void sleepFor(int sleepInterval) throws InterruptedException {
-			int lastI = (int) Math.ceil(((double) sleepInterval) / 1000d);
-			for (int i = 0; i < lastI; i++) {
-				if (stopRequest) {
-					return;
-				}
-				if (i == lastI) {
-					Thread.sleep(sleepInterval % 1000);
-				} else {
-					Thread.sleep(lastI);
-				}
-				Thread.sleep(sleepInterval);
-			}
-		}
-		
-	}
-}

src/main/java/org/warp/jcwdb/DBDataOutput.java

@@ -1,34 +0,0 @@
-package org.warp.jcwdb;
-
-public interface DBDataOutput<T> {
-	int getSize();
-	int getType();
-	long calculateHash();
-	DBWriter<T> getWriter();
-	
-	static <T> DBDataOutput<T> create(DBWriter<T> writer, int type, int size, long hash) {
-		return new DBDataOutput<T>() {
-
-			@Override
-			public int getSize() {
-				return size;
-			}
-
-			@Override
-			public int getType() {
-				return type;
-			}
-			
-			@Override
-			public long calculateHash() {
-				return hash;
-			}
-
-			@Override
-			public DBWriter<T> getWriter() {
-				return writer;
-			}
-			
-		};
-	}
-}

src/main/java/org/warp/jcwdb/DBGenericObjectParser.java

@@ -1,58 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.ByteArrayOutputStream;
-
-import com.esotericsoftware.kryo.Kryo;
-import com.esotericsoftware.kryo.io.Output;
-
-import net.openhft.hashing.LongHashFunction;
-
-public class DBGenericObjectParser extends DBTypeParserImpl<Object> implements DBTypedObjectParser<Object> {
-	private static final LongHashFunction hashFunction = net.openhft.hashing.LongHashFunction.xx();
-	private static final Kryo kryo = new Kryo();
-	static {
-		kryo.setRegistrationRequired(false);
-	}
-	
-	private static final DBReader<Object> defaultReader = (i, size) -> {
-		return kryo.readClassAndObject(i);
-	};
-	
-	public DBReader<Object> getReader() {
-		return defaultReader;
-	}
-	
-	public DBDataOutput<Object> getWriter(final Object value) {
-		ByteArrayOutputStream baos = new ByteArrayOutputStream();
-		Output tmpO = new Output(baos);
-		kryo.writeClassAndObject(tmpO, value);
-		tmpO.flush();
-		final byte[] bytes = baos.toByteArray();
-		final long hash = hashFunction.hashBytes(bytes);
-		tmpO.close();
-		return DBDataOutput.create((o) -> {
-			o.write(bytes);
-		}, DBStandardTypes.GENERIC_OBJECT, bytes.length, hash);
-	}
-
-	@Override
-	public long calculateHash(Object value) {
-		ByteArrayOutputStream baos = new ByteArrayOutputStream();
-		Output tmpO = new Output(baos);
-		kryo.writeClassAndObject(tmpO, value);
-		tmpO.flush();
-		final byte[] bytes = baos.toByteArray();
-		final long hash = hashFunction.hashBytes(bytes);
-		tmpO.close();
-		return hash;
-	}
-
-
-	@Override
-	public <U> void registerClass(Class<U> clazz, int id) {
-		if (id >= Integer.MAX_VALUE - 100) {
-			throw new IndexOutOfBoundsException();
-		}
-		kryo.register(clazz, id + 100);
-	}
-}

src/main/java/org/warp/jcwdb/DBLightArrayListParser.java

@@ -1,45 +0,0 @@
-package org.warp.jcwdb;
-
-import it.unimi.dsi.fastutil.longs.LongArrayList;
-
-public class DBLightArrayListParser<T> extends DBTypeParserImpl<LightArrayList<T>> {
-	private final JCWDatabase db;
-
-	public DBLightArrayListParser(JCWDatabase db) {
-		this.db = db;
-	}
-
-	public DBReader<LightArrayList<T>> getReader() {
-		return (i, size) -> {
-			LongArrayList internalList = new LongArrayList();
-			long max = size / Long.BYTES;
-			for (int item = 0; item < max; item++) {
-				long itm = i.readLong();
-				internalList.add(itm);
-			}
-			return new LightArrayList<T>(db, internalList);
-		};
-	}
-
-	public DBDataOutput<LightArrayList<T>> getWriter(final LightArrayList<T> value) {
-		final int elementsCount = value.size();
-		return DBDataOutput.create((o) -> {
-			LongArrayList list = value.internalList;
-			for (int i = 0; i < elementsCount; i++) {
-				o.writeLong(list.getLong(i));
-			}
-		}, DBStandardTypes.LIGHT_LIST_ARRAY, elementsCount * Long.BYTES, calculateHash(value));
-	}
-
-	@Override
-	public long calculateHash(LightArrayList<T> value) {
-		return value.internalList.hashCode();
-	}
-
-	@Override
-	public String toString() {
-		return "DBLightArrayListParser{" +
-						"db=" + db +
-						'}';
-	}
-}

src/main/java/org/warp/jcwdb/DBLightBigListParser.java

@@ -1,44 +0,0 @@
-package org.warp.jcwdb;
-
-import it.unimi.dsi.fastutil.ints.IntArrayList;
-import it.unimi.dsi.fastutil.longs.LongArrayList;
-
-public class DBLightBigListParser<T> extends DBTypeParserImpl<LightBigList<T>> {
-	private final JCWDatabase db;
-
-	public DBLightBigListParser(JCWDatabase db) {
-		this.db = db;
-	}
-
-	public DBReader<LightBigList<T>> getReader() {
-		return (i, size) -> {
-			LongArrayList chunks = new LongArrayList();
-			IntArrayList chunkSizes = new IntArrayList();
-			long max = size / (Long.BYTES + Integer.BYTES);
-			for (int item = 0; item < max; item++) {
-				long itm = i.readLong();
-				int itm2 = i.readInt();
-				chunks.add(itm);
-				chunkSizes.add(itm2);
-			}
-			return new LightBigList<>(db, chunks, chunkSizes);
-		};
-	}
-
-	public DBDataOutput<LightBigList<T>> getWriter(final LightBigList<T> value) {
-		final int elementsCount = value.chunksCount();
-		return DBDataOutput.create((o) -> {
-			LongArrayList list = value.chunks;
-			IntArrayList list2 = value.chunkSizes;
-			for (int i = 0; i < elementsCount; i++) {
-				o.writeLong(list.getLong(i));
-				o.writeInt(list2.getInt(i));
-			}
-		}, DBStandardTypes.LIGHT_LIST_BIG, elementsCount * (Long.BYTES + Integer.BYTES), calculateHash(value));
-	}
-
-	@Override
-	public long calculateHash(LightBigList<T> value) {
-		return (((long)value.chunks.hashCode()) << 32) | (value.chunkSizes.hashCode() & 0xffffffffL);
-	}
-}

src/main/java/org/warp/jcwdb/DBReader.java

@@ -1,7 +0,0 @@
-package org.warp.jcwdb;
-
-import com.esotericsoftware.kryo.io.Input;
-
-public interface DBReader<T> {
-	T read(Input i, int size);
-}

src/main/java/org/warp/jcwdb/DBStandardTypes.java

@@ -1,24 +0,0 @@
-package org.warp.jcwdb;
-
-public class DBStandardTypes {
-	private static final int STD =							0xFFFFF000;
-	public static final int BOOLEAN =						STD|	0x000;
-	public static final int BYTE =							STD|	0x001;
-	public static final int SHORT =							STD|	0x002;
-	public static final int CHAR =							STD|	0x003;
-	public static final int INTEGER =						STD|	0x004;
-	public static final int FLOAT =			 				STD|	0x005;
-	public static final int DOUBLE =		 				STD|	0x006;
-	public static final int STRING =						STD|	0x007;
-	public static final int BYTE_ARRAY =				STD|	0x008;
-	public static final int LIGHT_LIST_ARRAY =	STD|	0x009;
-	public static final int LIGHT_LIST_BIG =		STD|	0x00A;
-	public static final int GENERIC_OBJECT =		STD|	0x00B;
-
-	public static void registerStandardTypes(JCWDatabase db, TypesManager typesManager) {
-		typesManager.registerType(String.class, STRING, new DBStringParser());
-		typesManager.registerType(LightArrayList.class, LIGHT_LIST_ARRAY, new DBLightArrayListParser(db));
-		typesManager.registerType(LightBigList.class, LIGHT_LIST_BIG, new DBLightBigListParser(db));
-		typesManager.registerTypeFallback(new DBGenericObjectParser());
-	}
-}

src/main/java/org/warp/jcwdb/DBStringParser.java

@@ -1,27 +0,0 @@
-package org.warp.jcwdb;
-
-import java.nio.charset.StandardCharsets;
-
-import net.openhft.hashing.LongHashFunction;
-
-public class DBStringParser extends DBTypeParserImpl<String> {
-	private static final LongHashFunction hashFunction = net.openhft.hashing.LongHashFunction.xx();
-	private static final DBReader<String> defaultReader = (i, size) -> {
-		return new String(i.readBytes(size), StandardCharsets.UTF_16LE);
-	};
-	
-	public DBReader<String> getReader() {
-		return defaultReader;
-	}
-	
-	public DBDataOutput<String> getWriter(final String value) {
-		return DBDataOutput.create((o) -> {
-			o.write(value.getBytes(StandardCharsets.UTF_16LE));
-		}, DBStandardTypes.STRING, value.length() * 2, calculateHash(value));
-	}
-
-	@Override
-	public long calculateHash(String value) {
-		return hashFunction.hashBytes(value.getBytes(StandardCharsets.UTF_16LE));
-	}
-}

src/main/java/org/warp/jcwdb/DBTypeParser.java

@@ -1,7 +0,0 @@
-package org.warp.jcwdb;
-
-public interface DBTypeParser<T> extends Castable {	
-	DBReader<T> getReader();
-	DBDataOutput<T> getWriter(final T value);
-	long calculateHash(final T value);
-}

src/main/java/org/warp/jcwdb/DBTypeParserImpl.java

@@ -1,9 +0,0 @@
-package org.warp.jcwdb;
-
-public abstract class DBTypeParserImpl<T> implements DBTypeParser<T> {
-	@SuppressWarnings("unchecked")
-	@Override
-	public T cast() {
-		return (T) this;
-	}
-}

src/main/java/org/warp/jcwdb/DBTypedObjectParser.java

@@ -1,5 +0,0 @@
-package org.warp.jcwdb;
-
-public interface DBTypedObjectParser<T> extends DBTypeParser<T> {
-	public <U> void registerClass(Class<U> clazz, int type);
-}

src/main/java/org/warp/jcwdb/DBWriter.java

@@ -1,7 +0,0 @@
-package org.warp.jcwdb;
-
-import com.esotericsoftware.kryo.io.Output;
-
-public interface DBWriter<T> {
-	void write(Output o);
-}

src/main/java/org/warp/jcwdb/Editable.java

@@ -1,60 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.IOException;
-import java.util.function.BiConsumer;
-import java.util.function.BiFunction;
-import java.util.function.Consumer;
-import java.util.function.Function;
-
-public interface Editable<T> {
-	/**
-	 * Reccomended way to edit the value
-	 *
-	 * @param editFunction
-	 * @throws IOException
-	 */
-	void editValue(BiFunction<T, Saveable, T> editFunction);
-
-	/**
-	 * Reccomended way to edit the value
-	 * @param editFunction
-	 * @throws IOException
-	 */
-	void editValue(Function<T, T> editFunction);
-
-	/**
-	 * Reccomended way to edit the value
-	 * @param editFunction
-	 * @throws IOException
-	 */
-	void editValue(BiConsumer<T, Saveable> editFunction);
-
-	/**
-	 * Reccomended way to edit the value
-	 * @param editFunction
-	 * @throws IOException
-	 */
-	void editValue(Consumer<T> editFunction);
-
-	/**
-	 * Reccomended way to view the value
-	 * @param viewFunction
-	 * @throws IOException
-	 */
-	void viewValue(Consumer<T> viewFunction);
-
-	/**
-	 * Substitute the old value with a new one
-	 * @param val
-	 * @throws IOException
-	 */
-	void setValue(T val);
-
-
-	/**
-	 * DO NOT ATTEMPT TO MODIFY THE VALUE RETURNED
-	 * @return
-	 */
-	T getValueReadOnlyUnsafe();
-
-}

src/main/java/org/warp/jcwdb/EntryReference.java

@@ -1,266 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.IOException;
-import java.util.function.BiConsumer;
-import java.util.function.BiFunction;
-import java.util.function.Consumer;
-import java.util.function.Function;
-
-/**
- * You must have only a maximum of 1 reference for each index
- * @param <T>
- */
-public class EntryReference<T> implements Editable<T>, Saveable, Castable {
-	private final JCWDatabase.EntryReferenceTools db;
-	private final long entryIndex;
-	private final DBTypeParser<T> parser;
-	private T value;
-	private long cachedHash;
-	private volatile boolean isHashCached;
-	private volatile boolean loaded;
-	private volatile boolean closed;
-	private volatile boolean isFlushingAllowed;
-	private final Object hashCacheLock = new Object();
-	private final Object accessLock = new Object();
-	private final Object closeLock = new Object();
-
-	public EntryReference(JCWDatabase.EntryReferenceTools db, long entryId, long hash, DBTypeParser<T> parser) {
-		this.loaded = false;
-		this.isHashCached = false;
-		this.db = db;
-		this.entryIndex = entryId;
-		this.parser = parser;
-		this.value = null;
-	}
-
-	public EntryReference(JCWDatabase.EntryReferenceTools db, long entryId, long hash, DBTypeParser<T> parser, T value) {
-		this.loaded = true;
-		this.isHashCached = true;
-		this.db = db;
-		this.entryIndex = entryId;
-		this.parser = parser;
-		this.cachedHash = hash;
-		this.value = value;
-	}
-
-	public DBTypeParser<T> getParser() {
-		return parser;
-	}
-
-	public long getIndex() {
-		return entryIndex;
-	}
-	
-	public long calculateHash() {
-		synchronized(accessLock) {
-			load();
-			synchronized(hashCacheLock) {
-				if (isHashCached) {
-					return cachedHash;
-				}
-			}
-			return parser.calculateHash(this.value);
-		}
-	}
-
-	public boolean isClosed() {
-		return closed;
-	}
-
-	/**
-	 * Note that this method won't be called when closing without saving
-	 */
-	public void save() {
-		this.save(false);
-	}
-
-	public void saveAndFlush() {
-		this.save(true);
-	}
-
-	private void save(boolean flush) {
-		synchronized(accessLock) {
-			if (loaded && !closed) {
-				try {
-					if (value instanceof Saveable) {
-						if (flush) {
-							((Saveable)value).saveAndFlush();
-						} else {
-							((Saveable)value).save();
-						}
-					}
-					IndexDetails returnedDetails = this.db.write(entryIndex, parser.getWriter(value));
-					synchronized(hashCacheLock) {
-						this.cachedHash = returnedDetails.getHash();
-						this.isHashCached = true;
-					}
-					if (flush) {
-						if (!isFlushingAllowed) {
-							this.db.setFlushingAllowed(entryIndex, true);
-							this.isFlushingAllowed = true;
-						}
-					}
-				} catch (IOException e) {
-					e.printStackTrace();
-				}
-			}
-		}
-	}
-
-	/**
-	 * Reccomended way to edit the value
-	 * @param editFunction
-	 * @throws IOException
-	 */
-	public void editValue(BiFunction<T, Saveable, T> editFunction) {
-		synchronized(accessLock) {
-			load();
-			this.value = editFunction.apply(this.value, this);
-			this.save(true);
-		}
-	}
-
-	/**
-	 * Reccomended way to edit the value
-	 * @param editFunction
-	 * @throws IOException
-	 */
-	public void editValue(Function<T, T> editFunction) {
-		synchronized(accessLock) {
-			load();
-			this.value = editFunction.apply(this.value);
-			this.save(true);
-		}
-	}
-
-	/**
-	 * Reccomended way to edit the value
-	 * @param editFunction
-	 * @throws IOException
-	 */
-	public void editValue(BiConsumer<T, Saveable> editFunction) {
-		synchronized(accessLock) {
-			load();
-			editFunction.accept(this.value, this);
-			this.save(true);
-		}
-	}
-
-	/**
-	 * Reccomended way to edit the value
-	 * @param editFunction
-	 * @throws IOException
-	 */
-	public void editValue(Consumer<T> editFunction) {
-		synchronized(accessLock) {
-			load();
-			editFunction.accept(this.value);
-			this.save(true);
-		}
-	}
-
-	/**
-	 * Reccomended way to edit the value
-	 * DO NOT EDIT THE VALUE
-	 * @param viewFunction
-	 * @throws IOException
-	 */
-	public void viewValue(Consumer<T> viewFunction) {
-		synchronized(accessLock) {
-			load();
-			viewFunction.accept(this.value);
-		}
-	}
-
-	/**
-	 * Substitute the old value with a new one
-	 * @param val
-	 * @throws IOException
-	 */
-	public void setValue(T val) {
-		synchronized(accessLock) {
-			this.loaded = true;
-			this.value = val;
-			synchronized(hashCacheLock) {
-				this.isHashCached = false;
-			}
-			this.save(true);
-		}
-	}
-
-	/**
-	 * Use editValue instead. READ ONLY!!
-	 * @return
-	 */
-	@Deprecated()
-	public T getValue() {
-		return getValueReadOnlyUnsafe();
-	}
-
-	/**
-	 * DO NOT ATTEMPT TO MODIFY THE VALUE RETURNED
-	 * @return
-	 */
-	public T getValueReadOnlyUnsafe() {
-		synchronized(accessLock) {
-			load();
-			return this.value;
-		}
-		
-	}
-
-	private void load() {
-		synchronized(accessLock) {
-			if (!loaded) {
-				try {
-					if (this.isFlushingAllowed) {
-						this.db.setFlushingAllowed(entryIndex, false);
-						this.isFlushingAllowed = false;
-					}
-					this.value = db.read(entryIndex, parser.getReader());
-					this.loaded = true;
-				} catch (IOException e) {
-					throw (NullPointerException) new NullPointerException(e.getLocalizedMessage()).initCause(e);
-				}
-			}
-		}
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public <U> U cast() {
-		return (U) this;
-	}
-
-	protected void close() throws IOException {
-		if (closed) {
-			return;
-		}
-		synchronized (closeLock) {
-			if (closed) {
-				return;
-			}
-
-			save(true);
-
-			closed = true;
-		}
-	}
-
-	public void closeWithoutSaving() {
-		if (closed) {
-			return;
-		}
-		synchronized (closeLock) {
-			if (closed) {
-				return;
-			}
-
-			closed = true;
-		}
-	}
-	
-	public Object getAccessLock() {
-		return accessLock;
-	}
-}

src/main/java/org/warp/jcwdb/FileAllocator.java

@@ -1,147 +0,0 @@
-package org.warp.jcwdb;
-
-import it.unimi.dsi.fastutil.longs.*;
-import it.unimi.dsi.fastutil.objects.ObjectBidirectionalIterator;
-
-import java.io.IOException;
-import java.nio.channels.SeekableByteChannel;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Map;
-import java.util.Optional;
-import java.util.stream.Stream;
-
-public class FileAllocator implements AutoCloseable {
-	private static final int MAXIMUM_UNALLOCATED_ENTRIES = 50000;
-
-	private final SeekableByteChannel dataFileChannel;
-	private volatile long fileSize;
-	private volatile boolean closed;
-	private final Object closeLock = new Object();
-	private final Object allocateLock = new Object();
-	/**
-	 * index -> free space size
-	 */
-	private final Long2IntMap freeBytes = new Long2IntLinkedOpenHashMap();
-
-	public FileAllocator(SeekableByteChannel dataFileChannel) throws IOException {
-		this.dataFileChannel = dataFileChannel;
-		this.fileSize = this.dataFileChannel.size();
-	}
-
-	public FileAllocator(SeekableByteChannel dataFileChannel, long fileSize, Long2IntMap freeBytes) throws IOException {
-		this.dataFileChannel = dataFileChannel;
-		this.fileSize = fileSize;
-		this.freeBytes.putAll(freeBytes);
-	}
-
-	/**
-	 * TODO: not implemented
-	 *
-	 * @param size
-	 * @return offset
-	 */
-	public long allocate(int size) {
-		checkClosed();
-		synchronized (allocateLock) {
-			long offset = allocateIntoUnusedParts(size);
-			if (offset == -1) {
-				return allocateToEnd(size);
-			} else {
-				return offset;
-			}
-		}
-	}
-
-	private long allocateIntoUnusedParts(int size) {
-		Stream<Map.Entry<Long,Integer>> sorted =
-						freeBytes.entrySet().stream()
-										.sorted(Collections.reverseOrder(Map.Entry.comparingByValue()));
-		final VariableWrapper<Long> holeOffset = new VariableWrapper<>(-1L);
-		final VariableWrapper<Integer> holeSize = new VariableWrapper<>(0);
-		sorted.anyMatch((entry) -> {
-			int currentHoleSize = entry.getValue();
-			if (currentHoleSize < size) {
-				return true;
-			}
-			holeOffset.var = entry.getKey();
-			holeSize.var = currentHoleSize;
-			return false;
-		});
-		if (holeOffset.var != -1L) {
-			freeBytes.remove(holeOffset.var);
-			if (holeSize.var > size) {
-				freeBytes.put(holeOffset.var + size, holeSize.var - size);
-			}
-		}
-		return holeOffset.var;
-	}
-
-	private long allocateToEnd(int size) {
-		long allocatedOffset = fileSize;
-		fileSize += size;
-		return allocatedOffset;
-	}
-
-
-	public void close() throws IOException {
-		if (closed) {
-			return;
-		}
-		synchronized (closeLock) {
-			if (closed) {
-				return;
-			}
-			closed = true;
-		}
-	}
-
-	/**
-	 * Frees the unused bytes
-	 *
-	 * @param startPosition
-	 * @param length
-	 */
-	public void markFree(long startPosition, int length) {
-		checkClosed();
-
-		if (freeBytes.containsKey(startPosition + length)) {
-			int secondLength = freeBytes.remove(startPosition + length);
-			freeBytes.put(startPosition, length + secondLength);
-		} else {
-			boolean addedToList = false;
-			for (Long2IntMap.Entry entry : freeBytes.long2IntEntrySet()) {
-				if (entry.getLongKey() + entry.getIntValue() == startPosition) {
-					freeBytes.put(entry.getLongKey(), entry.getIntValue() + length);
-					addedToList = true;
-					break;
-				}
-			}
-			if (!addedToList && length > 0) {
-				freeBytes.put(startPosition, length);
-			}
-		}
-
-		if (startPosition + length >= fileSize) {
-			fileSize = startPosition;
-		}
-
-		// Remove the smallest hole in the file
-		if (freeBytes.size() > MAXIMUM_UNALLOCATED_ENTRIES) {
-			Stream<Map.Entry<Long,Integer>> sorted =
-							freeBytes.entrySet().stream()
-											.sorted(Map.Entry.comparingByValue());
-			Optional<Map.Entry<Long, Integer>> first = sorted.findFirst();
-			if (first.isPresent()) {
-				freeBytes.remove(first.get().getKey());
-			}
-		}
-	}
-
-
-	private void checkClosed() {
-		if (closed) {
-			throw new RuntimeException("Index Manager is closed.");
-		}
-	}
-}

src/main/java/org/warp/jcwdb/FileIndexManager.java

@@ -1,539 +0,0 @@
-package org.warp.jcwdb;
-
-import com.esotericsoftware.kryo.io.Input;
-import com.esotericsoftware.kryo.io.Output;
-import it.unimi.dsi.fastutil.longs.*;
-import it.unimi.dsi.fastutil.objects.ObjectIterator;
-
-import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.nio.channels.Channels;
-import java.nio.channels.SeekableByteChannel;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.StandardOpenOption;
-
-public class FileIndexManager implements IndexManager {
-	private final SeekableByteChannel dataFileChannel, metadataFileChannel;
-	private volatile long metadataFileChannelSize;
-	private final FileAllocator fileAllocator;
-	private final ByteBuffer metadataByteBuffer = ByteBuffer.allocateDirect(IndexDetails.TOTAL_BYTES);
-	private final ByteBuffer maskByteBuffer = ByteBuffer.allocateDirect(Integer.BYTES);
-	private volatile boolean closed;
-	private final Object closeLock = new Object();
-	private final Object metadataByteBufferLock = new Object();
-	private final Object maskByteBufferLock = new Object();
-	private final Object indicesMapsAccessLock = new Object();
-
-	/**
-	 * Edit this using editIndex()
-	 * Get using getIndexMetadata()
-	 * This hashmap must contain all indices.
-	 */
-	private final Long2ObjectMap<IndexDetails> loadedIndices;
-	/**
-	 * Edit this using editIndex()
-	 */
-	private final LongSet dirtyLoadedIndices, flushingAllowedIndices, removedIndices;
-	private long firstAllocableIndex;
-
-	public FileIndexManager(Path dataFile, Path metadataFile) throws IOException {
-		if (Cleaner.DISABLE_CLEANER) {
-			loadedIndices = new Long2ObjectOpenHashMap<>();
-			dirtyLoadedIndices = new LongOpenHashSet();
-			flushingAllowedIndices = new LongOpenHashSet();
-			removedIndices = new LongOpenHashSet();
-		} else {
-			loadedIndices = new Long2ObjectLinkedOpenHashMap<>();
-			dirtyLoadedIndices = new LongLinkedOpenHashSet();
-			flushingAllowedIndices = new LongLinkedOpenHashSet();
-			removedIndices = new LongLinkedOpenHashSet();
-		}
-		if (Files.notExists(dataFile)) {
-			Files.createFile(dataFile);
-		}
-		if (Files.notExists(metadataFile)) {
-			Files.createFile(metadataFile);
-		}
-		dataFileChannel = Files.newByteChannel(dataFile, StandardOpenOption.READ, StandardOpenOption.WRITE);
-		metadataFileChannel = Files.newByteChannel(metadataFile, StandardOpenOption.READ, StandardOpenOption.WRITE);
-		fileAllocator = createFileAllocator(dataFileChannel, metadataFileChannel.position(0));
-		metadataFileChannelSize = metadataFileChannel.size();
-		firstAllocableIndex = getMetadataFileChannelSize() / (long) IndexDetails.TOTAL_BYTES;
-		if (firstAllocableIndex == 0) {
-			firstAllocableIndex = 1;
-		}
-	}
-
-	private long getMetadataFileChannelSize() throws IOException {
-		return metadataFileChannelSize;
-	}
-
-	private FileAllocator createFileAllocator(final SeekableByteChannel dataFileChannel, final SeekableByteChannel metadataFileChannel) throws IOException {
-		Long2IntMap freeBytes = new Long2IntRBTreeMap();
-		Long2IntMap usedBytes = new Long2IntRBTreeMap();
-		long firstOffset = 0;
-		while (metadataFileChannel.position() + IndexDetails.TOTAL_BYTES <= getMetadataFileChannelSize()) {
-			IndexDetails indexDetails = readIndexDetailsAt(metadataFileChannel);
-			if (indexDetails != null) {
-				long offset = indexDetails.getOffset();
-				usedBytes.put(offset, indexDetails.getSize());
-				if (offset < firstOffset) {
-					firstOffset = offset;
-				}
-			}
-		}
-
-		long previousEntryOffset = 0;
-		long previousEntrySize = 0;
-		ObjectIterator<Long2IntMap.Entry> it = usedBytes.long2IntEntrySet().iterator();
-		while (it.hasNext()) {
-			final Long2IntMap.Entry entry = it.next();
-			final long entryOffset = entry.getLongKey();
-			final long entrySize = entry.getIntValue();
-			it.remove();
-
-			if (previousEntryOffset + previousEntrySize < entryOffset) {
-				freeBytes.put(previousEntryOffset + previousEntrySize, (int) (entryOffset - (previousEntryOffset + previousEntrySize)));
-			}
-
-			previousEntryOffset = entryOffset;
-			previousEntrySize = entrySize;
-		}
-
-		final long fileSize = previousEntryOffset + previousEntrySize;
-
-		return new FileAllocator(dataFileChannel, fileSize, freeBytes);
-	}
-
-	@Override
-	public <T> T get(long index, DBReader<T> reader) throws IOException {
-		checkClosed();
-		IndexDetails details = getIndexMetadata(index);
-		Input i = new Input(Channels.newInputStream(dataFileChannel.position(details.getOffset())));
-		T result = reader.read(i, details.getSize());
-		return result;
-	}
-
-	@Override
-	public int getType(long index) throws IOException {
-		return getIndexMetadata(index).getType();
-	}
-
-	@Override
-	public long getHash(long index) throws IOException {
-		return getIndexMetadata(index).getHash();
-	}
-
-	@Override
-	public <T> IndexDetails set(long index, DBDataOutput<T> data) throws IOException {
-		checkClosed();
-		final int dataSize = data.getSize();
-		IndexDetails indexDetails = getIndexMetadataUnsafe(index);
-		if (indexDetails == null || indexDetails.getSize() < dataSize) {
-			// Allocate new space
-			IndexDetails newDetails = allocateAndWrite(index, data);
-			if (indexDetails != null) {
-				// Mark free the old bytes
-				fileAllocator.markFree(indexDetails.getOffset(), indexDetails.getSize());
-			}
-			return newDetails;
-		} else {
-			// Check if size changed
-			if (dataSize < indexDetails.getSize()) {
-				// Mark free the unused bytes
-				fileAllocator.markFree(indexDetails.getOffset() + dataSize, dataSize);
-			}
-			// Update index details
-			indexDetails = editIndex(index, indexDetails, indexDetails.getOffset(), dataSize, indexDetails.getType(), data.calculateHash());
-			// Write data
-			writeExact(indexDetails, data);
-			// Before returning, return IndexDetails
-			return indexDetails;
-		}
-	}
-
-	@Override
-	public void setFlushingAllowed(long index, boolean isUnloadingAllowed) {
-		checkClosed();
-		if (isUnloadingAllowed) {
-			flushingAllowedIndices.add(index);
-		} else {
-			flushingAllowedIndices.remove(index);
-		}
-	}
-
-	@Override
-	public <T> long add(DBDataOutput<T> data) throws IOException {
-		checkClosed();
-		final int size = data.getSize();
-		final long offset = fileAllocator.allocate(size);
-		final int type = data.getType();
-		final long hash = data.calculateHash();
-		final IndexDetails indexDetails = new IndexDetails(offset, size, type, hash);
-		final long index = createIndexMetadata(indexDetails);
-		writeExact(indexDetails, data);
-		return index;
-	}
-
-	@Override
-	public <T> FullIndexDetails addAndGetDetails(DBDataOutput<T> data) throws IOException {
-		checkClosed();
-		final int size = data.getSize();
-		final long offset = fileAllocator.allocate(size);
-		final int type = data.getType();
-		final long hash = data.calculateHash();
-		final IndexDetails indexDetails = new IndexDetails(offset, size, type, hash);
-		final long index = createIndexMetadata(indexDetails);
-		writeExact(indexDetails, data);
-		return new FullIndexDetails(index, indexDetails);
-	}
-
-	/**
-	 * Write the data at index.
-	 * The input size must be equal to the index size!
-	 *
-	 * @param indexDetails
-	 * @param data
-	 * @throws IOException
-	 */
-	private void writeExact(final IndexDetails indexDetails, DBDataOutput<?> data) throws IOException {
-		final int dataSize = data.getSize();
-		if (indexDetails.getSize() != dataSize) {
-			throw new IOException("Unable to write " + dataSize + " in a space of " + indexDetails.getSize());
-		}
-		final long offset = indexDetails.getOffset();
-
-		final Output o = new Output(Channels.newOutputStream(dataFileChannel.position(offset)), dataSize);
-		data.getWriter().write(o);
-		o.flush();
-	}
-
-	private IndexDetails allocateAndWrite(final long index, DBDataOutput<?> w) throws IOException {
-		final int size = w.getSize();
-		final int type = w.getType();
-		final long hash = w.calculateHash();
-		final long offset = fileAllocator.allocate(size);
-		IndexDetails details = editIndex(index, offset, size, type, hash);
-		writeExact(details, w);
-		return details;
-	}
-
-	@Override
-	public void delete(long index) throws IOException {
-		checkClosed();
-		IndexDetails indexDetails = getIndexMetadataUnsafe(index);
-		if (indexDetails != null) {
-			fileAllocator.markFree(indexDetails.getOffset(), indexDetails.getSize());
-		}
-		synchronized (indicesMapsAccessLock) {
-			dirtyLoadedIndices.remove(index);
-			flushingAllowedIndices.remove(index);
-			loadedIndices.remove(index);
-			removedIndices.add(index);
-		}
-	}
-
-	public void flushAndUnload(long index) throws IOException {
-		if (removedIndices.contains(index)) {
-			synchronized (indicesMapsAccessLock) {
-				removedIndices.remove(index);
-				dirtyLoadedIndices.remove(index);
-				flushingAllowedIndices.remove(index);
-				loadedIndices.remove(index);
-			}
-			// Update indices metadata
-			SeekableByteChannel metadata = metadataFileChannel.position(index * IndexDetails.TOTAL_BYTES);
-			eraseIndexDetails(metadata);
-		}
-		boolean isDirty = false;
-		IndexDetails indexDetails = null;
-		synchronized (indicesMapsAccessLock) {
-			if (dirtyLoadedIndices.contains(index)) {
-				indexDetails = loadedIndices.get(index);
-				dirtyLoadedIndices.remove(index);
-				flushingAllowedIndices.remove(index);
-			}
-		}
-		if (isDirty) {
-			// Update indices metadata
-			long position = index * IndexDetails.TOTAL_BYTES;
-			resizeMetadataFileChannel(position);
-			SeekableByteChannel metadata = metadataFileChannel.position(position);
-			writeIndexDetails(metadata, indexDetails);
-		}
-		synchronized (indicesMapsAccessLock) {
-			loadedIndices.remove(index);
-		}
-	}
-
-	@Override
-	public boolean has(long index) {
-		checkClosed();
-		try {
-			return getIndexMetadataUnsafe(index) != null;
-		} catch (IOException ex) {
-			ex.printStackTrace();
-			return false;
-		}
-	}
-
-	/**
-	 * Edit index data if a change is detected
-	 * @param index
-	 * @param oldData Old index data to check
-	 * @param offset offset
-	 * @param size size
-	 * @param type type
-	 * @param hash hash
-	 * @return
-	 */
-	private IndexDetails editIndex(long index, IndexDetails oldData, long offset, int size, int type, long hash) {
-		if (oldData.getOffset() != offset || oldData.getSize() != size || oldData.getType() != type || oldData.getHash() != hash) {
-			return editIndex(index, offset, size, type, hash);
-		} else {
-			return oldData;
-		}
-	}
-
-	/**
-	 * Edit index data
-	 * @param index
-	 * @param offset
-	 * @param size
-	 * @param type
-	 * @param hash
-	 * @return
-	 */
-	private IndexDetails editIndex(long index, long offset, int size, int type, long hash) {
-		IndexDetails indexDetails = new IndexDetails(offset, size, type, hash);
-		editIndex(index, indexDetails);
-		return indexDetails;
-	}
-
-	/**
-	 * Edit index data
-	 * @param index
-	 * @param details
-	 */
-	private void editIndex(long index, IndexDetails details) {
-		synchronized (indicesMapsAccessLock) {
-			loadedIndices.put(index, details);
-			dirtyLoadedIndices.add(index);
-			flushingAllowedIndices.remove(index);
-		}
-	}
-
-	private long createIndexMetadata(IndexDetails indexDetails) {
-		synchronized (indicesMapsAccessLock) {
-			long newIndex = firstAllocableIndex++;
-			loadedIndices.put(newIndex, indexDetails);
-			dirtyLoadedIndices.add(newIndex);
-			flushingAllowedIndices.remove(newIndex);
-			removedIndices.remove(newIndex);
-			return newIndex;
-		}
-	}
-
-	private IndexDetails getIndexMetadataUnsafe(long index) throws IOException {
-		// Return index details if loaded
-		IndexDetails details;
-		synchronized (indicesMapsAccessLock) {
-			details = loadedIndices.getOrDefault(index, null);
-		}
-		if (details != null) return details;
-
-		// Try to load the details from file
-		final long metadataPosition = index * IndexDetails.TOTAL_BYTES;
-		if (metadataPosition + IndexDetails.TOTAL_BYTES > getMetadataFileChannelSize()) {
-			// Avoid underflow exception
-			return null;
-		}
-		SeekableByteChannel currentMetadataFileChannel = metadataFileChannel.position(metadataPosition);
-		IndexDetails indexDetails = readIndexDetailsAt(currentMetadataFileChannel);
-
-		if (indexDetails != null) {
-			editIndex(index, indexDetails);
-			return indexDetails;
-		}
-
-		// No results found. Returning null
-		return null;
-	}
-
-	private IndexDetails readIndexDetailsAt(SeekableByteChannel currentMetadataFileChannel) throws IOException {
-		IndexDetails indexDetails = null;
-		synchronized (metadataByteBufferLock) {
-			metadataByteBuffer.rewind();
-			currentMetadataFileChannel.read(metadataByteBuffer);
-			metadataByteBuffer.rewind();
-			// If it's not deleted continue
-			if ((metadataByteBuffer.getInt() & IndexDetails.MASK_DELETED) == 0) {
-				final long offset = metadataByteBuffer.getLong();
-//				final long sizeAndType = metadataByteBuffer.getLong();
-//				final int size = (int)(sizeAndType >> 32);
-//				final int type = (int)sizeAndType;
-				final int size = metadataByteBuffer.getInt();
-				final int type = metadataByteBuffer.getInt();
-				final long hash = metadataByteBuffer.getLong();
-				indexDetails = new IndexDetails(offset, size, type, hash);
-			}
-		}
-		return indexDetails;
-	}
-
-	private IndexDetails getIndexMetadata(long index) throws IOException {
-		IndexDetails details = getIndexMetadataUnsafe(index);
-		if (details == null)
-			throw new IOException("Index " + index + " not found");
-		else
-			return details;
-	}
-
-	@Override
-	public void close() throws IOException {
-		if (closed) {
-			return;
-		}
-		synchronized (closeLock) {
-			if (closed) {
-				return;
-			}
-			closed = true;
-		}
-
-		// Update indices metadata
-		flushAllFlushableIndices();
-
-		// Remove removed indices
-		removeRemovedIndices();
-		fileAllocator.close();
-	}
-
-	private void writeIndexDetails(SeekableByteChannel position, IndexDetails indexDetails) throws IOException {
-		synchronized (metadataByteBufferLock) {// FIXXXX cleaner3
-			final int size = indexDetails.getSize();
-			final int type = indexDetails.getType();
-			final long offset = indexDetails.getOffset();
-			final long hash = indexDetails.getHash();
-			metadataByteBuffer.rewind();
-			metadataByteBuffer.putInt(0);
-			metadataByteBuffer.putLong(offset);
-			metadataByteBuffer.putInt(size);
-			metadataByteBuffer.putInt(type);
-			//metadataByteBuffer.putLong((long)size << 32 | type & 0xFFFFFFFFL);
-			metadataByteBuffer.putLong(hash);
-			metadataByteBuffer.rewind();
-			position.write(metadataByteBuffer);
-		}
-	}
-
-	private void eraseIndexDetails(SeekableByteChannel position) throws IOException {
-		synchronized (maskByteBufferLock) {
-			maskByteBuffer.rewind();
-			maskByteBuffer.putInt(IndexDetails.MASK_DELETED);
-			maskByteBuffer.rewind();
-			position.write(maskByteBuffer);
-		}
-	}
-
-	private void checkClosed() {
-		if (closed) {
-			throw new RuntimeException("Index Manager is closed.");
-		}
-	}
-
-	@Override
-	public long clean() {
-		long cleaned = 0;
-		long tim1 = System.currentTimeMillis();
-		try {
-			cleaned += flushAllFlushableIndices();
-		} catch (IOException ex) {
-			ex.printStackTrace();
-		}
-		long tim2 = System.currentTimeMillis();
-		try {
-			cleaned += removeRemovedIndices();
-		} catch (IOException ex) {
-			ex.printStackTrace();
-		}
-		long tim3 = System.currentTimeMillis();
-		cleaned += cleanExtraIndices();
-		long tim4 = System.currentTimeMillis();
-		if (Cleaner.ENABLE_CLEANER_LOGGING) System.out.println("[CLEANER] FileIndexManager CLEAN_TIME: " + (tim2-tim1) + "," + (tim3-tim2) + "," + (tim4-tim3));
-		return cleaned;
-	}
-
-	private long flushAllFlushableIndices() throws IOException {
-		long flushedIndices = 0;
-		SeekableByteChannel metadata = metadataFileChannel;
-		long lastIndex = -2;
-		synchronized (indicesMapsAccessLock) {
-			for (long index : dirtyLoadedIndices) {
-				if (!flushingAllowedIndices.contains(index)) {
-					IndexDetails indexDetails = loadedIndices.get(index);
-					long position = index * IndexDetails.TOTAL_BYTES;
-					resizeMetadataFileChannel(position);
-					if (index - lastIndex != 1) {
-						metadata = metadata.position(position);
-					}
-					writeIndexDetails(metadata, indexDetails);
-					lastIndex = index;
-					flushedIndices++;
-				}
-			}
-			dirtyLoadedIndices.clear();
-			dirtyLoadedIndices.addAll(flushingAllowedIndices);
-			flushingAllowedIndices.clear();
-		}
-		return flushedIndices;
-	}
-
-	private void resizeMetadataFileChannel(long position) {
-		if (position + IndexDetails.TOTAL_BYTES > metadataFileChannelSize) {
-			metadataFileChannelSize = position + IndexDetails.TOTAL_BYTES;
-		}
-	}
-
-	private long removeRemovedIndices() throws IOException {
-		SeekableByteChannel metadata = metadataFileChannel;
-		synchronized (indicesMapsAccessLock) {
-			long removed = this.removedIndices.size();
-			for (long index : this.removedIndices) {
-					metadata = metadata.position(index * IndexDetails.TOTAL_BYTES);
-					eraseIndexDetails(metadata);
-			}
-			this.removedIndices.clear();
-			return removed;
-		}
-	}
-
-	private long cleanExtraIndices() {
-		long removedIndices = 0;
-		LongArrayList toUnload = new LongArrayList();
-		synchronized (indicesMapsAccessLock) {
-			if (loadedIndices.size() > JCWDatabase.MAX_LOADED_INDICES) {
-				long count = loadedIndices.size();
-				LongIterator it = loadedIndices.keySet().iterator();
-				while (it.hasNext()) {
-					long loadedIndex = it.nextLong();
-					if (count < JCWDatabase.MAX_LOADED_INDICES * 3l / 2l) {
-						break;
-					}
-					toUnload.add(loadedIndex);
-					removedIndices++;
-					count--;
-				}
-			}
-		}
-		for (long index : toUnload.elements()) {
-			try {
-				flushAndUnload(index);
-			} catch (IOException e) {
-				e.printStackTrace();
-			}
-		}
-		return removedIndices;
-	}
-}

src/main/java/org/warp/jcwdb/FullIndexDetails.java

@@ -1,14 +0,0 @@
-package org.warp.jcwdb;
-
-public class FullIndexDetails extends IndexDetails {
-	private final long index;
-
-	public FullIndexDetails(long index, IndexDetails details) {
-		super(details);
-		this.index = index;
-	}
-
-	public long getIndex() {
-		return index;
-	}
-}

src/main/java/org/warp/jcwdb/IndexDetails.java

@@ -1,88 +0,0 @@
-package org.warp.jcwdb;
-
-import java.util.Objects;
-
-public class IndexDetails {
-	/**
-	 * The bitmask is used to determine if an index has been deleted
-	 */
-	public static final int BITMASK_SIZE = Integer.BYTES;
-	public static final int OFFSET_BYTES = Long.BYTES;
-	public static final int DATA_SIZE_BYTES = Integer.BYTES;
-	public static final int TYPE_BYTES = Integer.BYTES;
-	public static final int HASH_BYTES = Long.BYTES;
-	public static final int TOTAL_BYTES = BITMASK_SIZE + OFFSET_BYTES + DATA_SIZE_BYTES + TYPE_BYTES + HASH_BYTES;
-	public static final int MASK_DELETED = 0b00000001;
-	private final long offset;
-	private final int size;
-	private final int type;
-	private final long hash;
-
-	public IndexDetails(long offset, int size, int type, long hash) {
-		this.offset = offset;
-		this.size = size;
-		this.type = type;
-		this.hash = hash;
-	}
-
-	public IndexDetails(IndexDetails indexDetails) {
-		this.offset = indexDetails.offset;
-		this.size = indexDetails.size;
-		this.type = indexDetails.type;
-		this.hash = indexDetails.hash;
-	}
-
-	public long getOffset() {
-		return offset;
-	}
-
-	public int getSize() {
-		return size;
-	}
-
-	public int getType() {
-		return type;
-	}
-	
-	public long getHash() {
-		return hash;
-	}
-
-	@Override
-	public int hashCode() {
-		final int prime = 31;
-		int result = 1;
-		result = prime * result + (int) (hash ^ (hash >>> 32));
-		result = prime * result + (int) (offset ^ (offset >>> 32));
-		result = prime * result + size;
-		result = prime * result + type;
-		return result;
-	}
-
-	@Override
-	public boolean equals(Object obj) {
-		if (this == obj)
-			return true;
-		if (obj == null)
-			return false;
-		if (getClass() != obj.getClass())
-			return false;
-		IndexDetails other = (IndexDetails) obj;
-		if (hash != other.hash)
-			return false;
-		if (offset != other.offset)
-			return false;
-		if (size != other.size)
-			return false;
-		if (type != other.type)
-			return false;
-		return true;
-	}
-
-	@Override
-	public String toString() {
-		return "IndexDetails [offset=" + offset + ", size=" + size + ", type=" + type + ", hash=" + hash + "]";
-	}
-	
-
-}

src/main/java/org/warp/jcwdb/IndexManager.java

@@ -1,19 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.IOException;
-import java.util.function.BiConsumer;
-import java.util.function.BiPredicate;
-import java.util.function.Consumer;
-
-public interface IndexManager extends Cleanable {
-	<T> T get(long index, DBReader<T> reader) throws IOException;
-	int getType(long index) throws IOException;
-	long getHash(long index) throws IOException;
-	<T> long add(DBDataOutput<T> writer) throws IOException;
-	<T> FullIndexDetails addAndGetDetails(DBDataOutput<T> writer) throws IOException;
-	<T> IndexDetails set(long index, DBDataOutput<T> writer) throws IOException;
-	void setFlushingAllowed(long index, boolean isUnloadingAllowed);
-	void delete(long index) throws IOException;
-	boolean has(long index);
-	void close() throws IOException;
-}

src/main/java/org/warp/jcwdb/JCWDatabase.java

@@ -1,197 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.IOError;
-import java.io.IOException;
-import java.nio.file.Path;
-import java.util.Iterator;
-import java.util.LinkedList;
-import java.util.function.Supplier;
-
-public class JCWDatabase implements AutoCloseable, Cleanable {
-	public final static long MAX_LOADED_INDICES = 1000;
-
-	private final TypesManager typesManager;
-	private final MixedIndexDatabase indices;
-	private final Cleaner databaseCleaner;
-	private final EntryReferenceTools entryReferenceTools = new EntryReferenceTools();
-	private volatile boolean closed;
-	private final Object closeLock = new Object();
-	private final Object indicesAccessLock = new Object();
-	private final LinkedList<EntryReference<?>> usedReferences = new LinkedList<>();
-
-	public JCWDatabase(Path dataFile, Path metadataFile) throws IOException {
-		this.typesManager = new TypesManager(this);
-		this.indices = new MixedIndexDatabase(dataFile, metadataFile);
-		Runtime.getRuntime().addShutdownHook(new Thread(() -> {
-			try {
-				JCWDatabase.this.close();
-			} catch (Exception e) {
-				e.printStackTrace();
-			}
-		}));
-		this.databaseCleaner = new Cleaner(this);
-
-		this.databaseCleaner.start();
-	}
-
-	public <T> EntryReference<LightList<T>> getRoot() {
-		try {
-			checkClosed();
-			if (exists(0)) {
-				return get(0);
-			} else {
-				LightList<T> newRoot = new LightBigList<>(this);
-				return set(0, newRoot);
-			}
-		} catch (IOException e) {
-			throw new IOError(e);
-		}
-	}
-
-	@SuppressWarnings("unchecked")
-	public <T> EntryReference<T> getRootItem(int index) {
-		return ((LightList<T>) getRoot().getValueReadOnlyUnsafe()).getReference(index);
-	}
-
-	@SuppressWarnings("unchecked")
-	public <T> EntryReference<T> getRootItem(int index, Supplier<T> defaultValue) {
-		return ((LightList<T>) getRoot().getValueReadOnlyUnsafe()).getReferenceOrInitialize(index, defaultValue);
-	}
-
-	public <T> EntryReference<LightList<T>> getRoot(Class<T> clazz) {
-		return getRoot().cast();
-	}
-
-	public <T> EntryReference<T> get(long index) throws IOException {
-		checkClosed();
-		int type;
-		long hash;
-		synchronized (indicesAccessLock) {
-			type = this.indices.getType(index);
-			hash = this.indices.getHash(index);
-		}
-		DBTypeParser<T> typeParser = this.typesManager.get(type);
-		return new EntryReference<>(entryReferenceTools, index, hash, typeParser);
-	}
-
-	protected <T> EntryReference<T> add(T value) throws IOException {
-		checkClosed();
-		DBTypeParser<T> typeParser = this.typesManager.get((Class<T>) value.getClass());
-		long index;
-		long hash;
-		synchronized (indicesAccessLock) {
-			FullIndexDetails fullIndexDetails = indices.addAndGetDetails(typeParser.getWriter(value));
-			index = fullIndexDetails.getIndex();
-			hash = fullIndexDetails.getHash();
-		}
-		return new EntryReference<>(entryReferenceTools, index, hash, typeParser, value);
-	}
-
-	protected boolean exists(long index) {
-		checkClosed();
-		synchronized (indicesAccessLock) {
-			return this.indices.has(index);
-		}
-	}
-
-	protected <T> EntryReference<T> set(long index, T value) throws IOException {
-		checkClosed();
-		EntryReference<T> ref;
-		if (exists(index)) {
-			ref = get(index);
-			ref.setValue(value);
-			return ref;
-		} else {
-			@SuppressWarnings("unchecked")
-			DBTypeParser<T> typeParser = this.typesManager.get((Class<T>) value.getClass());
-			long hash;
-			synchronized (indicesAccessLock) {
-				IndexDetails returnedDetails = indices.set(index, typeParser.getWriter(value));
-				hash = returnedDetails.getHash();
-			}
-			return new EntryReference<>(entryReferenceTools, index, hash, typeParser);
-		}
-	}
-
-	public <U> void registerType(Class<U> clazz, short type, DBTypeParser<U> parser) {
-		final int addition = 0xEFFF8000;
-		int extendedType = addition | (type & 0x7FFF);
-		typesManager.registerType(clazz, extendedType, parser);
-	}
-
-	public <U> void registerClass(Class<U> clazz, int type) {
-		typesManager.registerGenericClass(clazz, type);
-	}
-
-	public boolean isOpen() {
-		return !closed;
-	}
-
-	@Override
-	public void close() throws IOException {
-		if (closed) {
-			return;
-		}
-		synchronized (closeLock) {
-			if (closed) {
-				return;
-			}
-			closed = true;
-		}
-
-		this.databaseCleaner.stop();
-
-		synchronized (indicesAccessLock) {
-			this.indices.close();
-		}
-		System.out.println("Database closed.");
-	}
-
-	private void checkClosed() {
-		if (closed) {
-			throw new RuntimeException("Index Manager is closed.");
-		}
-	}
-
-	@Override
-	public long clean() {
-		long removedItems = indices.clean();
-		Iterator<EntryReference<?>> usedReferencesIterator = usedReferences.iterator();
-		while(usedReferencesIterator.hasNext()) {
-			EntryReference<?> entryReference = usedReferencesIterator.next();
-			if (entryReference.isClosed()) {
-				usedReferencesIterator.remove();
-				removedItems += 1;
-			}
-		}
-		return removedItems;
-	}
-
-	public class EntryReferenceTools {
-		private EntryReferenceTools() {
-
-		}
-
-		public <T> T read(long index, DBReader<T> reader) throws IOException {
-			return indices.get(index, reader);
-		}
-
-		public <T> IndexDetails write(long index, DBDataOutput<T> writer) throws IOException {
-			return indices.set(index, writer);
-		}
-
-		public void setFlushingAllowed(long index, boolean isFlushingAllowed) {
-			indices.setFlushingAllowed(index, isFlushingAllowed);
-		}
-
-		public <T> void setUsed(EntryReference<T> ref) {
-			usedReferences.add(ref);
-		}
-	}
-
-	@SuppressWarnings("unchecked")
-	protected <T> long calculateHash(T o) {
-		return ((DBTypeParser<T>) typesManager.get(o.getClass())).calculateHash(o);
-	}
-
-}

src/main/java/org/warp/jcwdb/LightArrayList.java

@@ -1,455 +0,0 @@
-package org.warp.jcwdb;
-
-import it.unimi.dsi.fastutil.longs.LongArrayList;
-import it.unimi.dsi.fastutil.objects.ObjectArrayList;
-
-import java.io.IOError;
-import java.io.IOException;
-import java.util.*;
-import java.util.function.Consumer;
-import java.util.function.Predicate;
-
-public class LightArrayList<T> implements LightList<T> {
-
-	public final LongArrayList internalList;
-	private final transient JCWDatabase db;
-
-	/**
-	 * @param db Database reference
-	 */
-	public LightArrayList(JCWDatabase db) {
-		this.db = db;
-		this.internalList = new LongArrayList();
-	}
-
-	/**
-	 * @param db       Database reference
-	 * @param elements Elements to add
-	 */
-	public LightArrayList(JCWDatabase db, LongArrayList elements) {
-		this.db = db;
-		this.internalList = new LongArrayList(elements);
-	}
-
-	@Override
-	public int size() {
-		return internalList.size();
-	}
-
-	@Override
-	public boolean isEmpty() {
-		return internalList.isEmpty();
-	}
-
-	@Override
-	public boolean contains(Object o) {
-		if (o != null) {
-			for (long element : internalList) {
-				EntryReference<T> ref = null;
-				try {
-					ref = db.get(element);
-					if (o.equals(ref.getValueReadOnlyUnsafe())) {
-						return true;
-					}
-				} catch (IOException e) {
-					e.printStackTrace();
-				}
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Use iteratorReferences()
-	 */
-	@Deprecated
-	@SuppressWarnings("unchecked")
-	@Override
-	public Iterator<T> iterator() {
-		System.out.println("WARNING! YOU ARE USING iterator()! PLEASE USE ITERATORREFERENCES TO AVOID OUTOFMEMORY!");
-		final ArrayList<T> elements = new ArrayList<>();
-		for (long element : internalList) {
-			try {
-				elements.add((T) db.get(element).getValueReadOnlyUnsafe());
-			} catch (IOException e) {
-				e.printStackTrace();
-			}
-		}
-		return elements.iterator();
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public Iterator<EntryReference<T>> iteratorReferences() {
-		final ArrayList<EntryReference<T>> elements = new ArrayList<>();
-		for (long element : internalList) {
-			try {
-				elements.add(db.get(element));
-			} catch (IOException e) {
-				e.printStackTrace();
-			}
-		}
-		return elements.iterator();
-	}
-
-	/**
-	 * USE forEachReference INSTEAD, TO AVOID OUTOFMEMORY
-	 *
-	 * @param action
-	 */
-	@Deprecated
-	@Override
-	public void forEach(Consumer<? super T> action) {
-		Objects.requireNonNull(action);
-		for (T t : this) {
-			action.accept(t);
-		}
-	}
-
-	@Override
-	public void forEachReference(Consumer<? super EntryReference<T>> action) {
-		Objects.requireNonNull(action);
-		for (long index : this.internalList) {
-			try {
-				action.accept(db.get(index));
-			} catch (IOException e) {
-				throw new IOError(e);
-			}
-		}
-	}
-
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public T[] toArray() {
-		final T[] elements = (T[]) new Object[internalList.size()];
-		for (int i = 0; i < elements.length; i++) {
-			try {
-				T element = (T) db.get(internalList.getLong(i)).getValueReadOnlyUnsafe();
-				elements[i] = element;
-			} catch (IOException e) {
-				e.printStackTrace();
-			}
-		}
-		return elements;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public <T1> T1[] toArray(T1[] a) {
-		final T1[] elements = (T1[]) new Objects[internalList.size()];
-		for (int i = 0; i < elements.length; i++) {
-			try {
-				elements[i] = (T1) db.get(internalList.getLong(i)).getValueReadOnlyUnsafe();
-			} catch (IOException e) {
-				e.printStackTrace();
-			}
-		}
-		return elements;
-	}
-
-	@Override
-	public boolean add(T o) {
-		EntryReference<T> ref = addEntry(o);
-		return ref != null;
-	}
-
-	@Override
-	public EntryReference<T> addEntry(T o) {
-		EntryReference<T> ref = addToDatabase(o);
-		if (internalList.add(ref.getIndex())) {
-			return ref;
-		} else {
-			return null;
-		}
-	}
-
-	@Override
-	public boolean remove(Object o) {
-		int removeIndex = indexOf(o);
-		if (removeIndex >= 0) {
-			internalList.removeLong(removeIndex);
-			return true;
-		}
-		return false;
-	}
-
-	@Override
-	public boolean remove(EntryReference<T> ref) {
-		int removeIndex = indexOfEntry(ref);
-		if (removeIndex >= 0) {
-			internalList.removeLong(removeIndex);
-			return true;
-		}
-		return false;
-	}
-
-	@Override
-	public boolean containsAll(Collection<?> c) {
-		for (Object o : c) {
-			int objIndex = indexOf(o);
-			if (objIndex < 0) {
-				return false;
-			}
-		}
-		return true;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public boolean addAll(Collection<? extends T> c) {
-		boolean result = false;
-		for (Object o : c) {
-			result |= add((T) o);
-		}
-		return result;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public boolean addAll(int index, Collection<? extends T> c) {
-		boolean result = false;
-		int delta = 0;
-		for (Object o : c) {
-			add(index + delta, (T) o);
-			result = true;
-			delta++;
-		}
-		return result;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public boolean removeAll(Collection<?> c) {
-		boolean result = false;
-		for (Object o : c) {
-			result |= remove((T) o);
-		}
-		return result;
-	}
-
-	@Override
-	public boolean retainAll(Collection<?> c) {
-		boolean result = false;
-		LongArrayList collectionHashes = new LongArrayList();
-		ObjectArrayList<Object> collection = new ObjectArrayList<>();
-		collection.addAll(c);
-		for (Object o : c) {
-			collectionHashes.add(db.calculateHash(o));
-		}
-		for (int i = 0; i < internalList.size(); i++) {
-			long hash = internalList.getLong(i);
-			int positionInCollection = collectionHashes.indexOf(hash);
-			if (positionInCollection == -1) {
-				remove(collection.get(positionInCollection));
-				result = true;
-			}
-		}
-		return result;
-	}
-
-	@Override
-	public void clear() {
-		internalList.clear();
-	}
-
-	/**
-	 * Use getReference or getReadOnlyValue
-	 */
-	@Deprecated
-	@Override
-	public T get(int index) {
-		return getReadOnlyValue(index);
-	}
-
-	@SuppressWarnings("unchecked")
-	public T getReadOnlyValue(int index) {
-		try {
-			return (T) db.get(internalList.getLong(index)).getValueReadOnlyUnsafe();
-		} catch (IOException e) {
-			e.printStackTrace();
-			return null;
-		}
-	}
-
-	@Override
-	public EntryReference<T> getReference(int index) {
-		try {
-			return db.get(internalList.getLong(index)).cast();
-		} catch (IOException e) {
-			e.printStackTrace();
-			return null;
-		}
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public T set(int index, T element) {
-		EntryReference<T> ref = addToDatabase(element);
-		long oldIndex = internalList.set(index, ref.getIndex());
-		try {
-			ref.close();
-			return ((EntryReference<T>) (db.get(oldIndex))).getValueReadOnlyUnsafe();
-		} catch (IOException e) {
-			throw (NullPointerException) new NullPointerException().initCause(e);
-		}
-	}
-
-	@Override
-	public void add(int index, T element) {
-		EntryReference<T> ref = addToDatabase(element);
-		internalList.add(index, ref.getIndex());
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public T remove(int index) {
-		long oldIndex = internalList.removeLong(index);
-		try {
-			return ((EntryReference<T>) (db.get(oldIndex))).getValueReadOnlyUnsafe();
-		} catch (IOException e) {
-			throw (NullPointerException) new NullPointerException().initCause(e);
-		}
-	}
-
-	@Override
-	public int indexOf(Object o) {
-		EntryReference<?> ref = addToDatabase(o);
-		long objToRemoveHash = ref.calculateHash();
-		LongArrayList hashes = new LongArrayList();
-
-
-		for (int i = 0; i < hashes.size(); i++) {
-			long hash = hashes.getLong(i);
-			if (objToRemoveHash == hash) {
-				try {
-					if (ref.equals(db.get(internalList.getLong(i)))) {
-						return i;
-					}
-				} catch (IOException e) {
-					throw (NullPointerException) new NullPointerException().initCause(e);
-				}
-			}
-		}
-		return -1;
-	}
-
-	@Override
-	public int indexOfEntry(EntryReference<T> ref) {
-		for (int i = 0; i < internalList.size(); i++) {
-			long index = internalList.getLong(i);
-			try {
-				EntryReference<?> ref2 = db.get(index);
-				if (ref.getValueReadOnlyUnsafe().equals(ref2.getValueReadOnlyUnsafe())) {
-					return i;
-				}
-			} catch (IOException e) {
-				throw (NullPointerException) new NullPointerException().initCause(e);
-			}
-		}
-		return -1;
-	}
-
-	@Override
-	public void appendIndex(long elementIndex) {
-		internalList.add(elementIndex);
-	}
-
-	@Override
-	public int lastIndexOf(Object o) {
-		EntryReference<T> ref = addToDatabase(o).cast();
-		return lastIndexOfEntry(ref);
-	}
-
-	@Override
-	public int lastIndexOfEntry(EntryReference<T> ref) {
-		long objToRemoveHash = ref.calculateHash();
-
-		int lastValue = -1;
-
-		for (int i = 0; i < internalList.size(); i++) {
-			long index2 = internalList.getLong(i);
-			try {
-				EntryReference<?> ref2 = db.get(index2);
-				if (objToRemoveHash == ref2.calculateHash()) {
-					if (ref.getValueReadOnlyUnsafe().equals(ref2.getValueReadOnlyUnsafe())) {
-						lastValue = i;
-					}
-				}
-			} catch (IOException e) {
-				throw (NullPointerException) new NullPointerException().initCause(e);
-			}
-		}
-		return lastValue;
-	}
-
-	@Deprecated
-	@Override
-	public ListIterator<T> listIterator() {
-		// TODO: implement
-		throw new RuntimeException("Not implemented!");
-	}
-
-	@Deprecated
-	@Override
-	public ListIterator<T> listIterator(int index) {
-		// TODO: implement
-		throw new RuntimeException("Not implemented!");
-	}
-
-	@Deprecated
-	@Override
-	public List<T> subList(int fromIndex, int toIndex) {
-		// TODO: implement
-		throw new RuntimeException("Not implemented!");
-	}
-
-	private <U> EntryReference<U> addToDatabase(U obj) {
-		EntryReference<U> ref;
-		try {
-			ref = db.add(obj);
-		} catch (IOException e) {
-			throw (NullPointerException) new NullPointerException().initCause(e);
-		}
-		return ref;
-	}
-
-	@Deprecated
-	@Override
-	public int hashCode() {
-		final int prime = 31;
-		int result = 1;
-		result = prime * result + ((internalList == null) ? 0 : internalList.hashCode());
-		return result;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public boolean removeIf(Predicate<? super T> filter) {
-		Objects.requireNonNull(filter);
-		boolean removed = false;
-		for (int i = 0; i < internalList.size(); ) {
-			T obj;
-			try {
-				obj = ((EntryReference<T>) (db.get(internalList.getLong(i)).cast())).getValueReadOnlyUnsafe();
-			} catch (IOException e) {
-				throw (NullPointerException) new NullPointerException().initCause(e);
-			}
-			if (filter.test(obj)) {
-				internalList.removeLong(i);
-				removed = true;
-			} else {
-				i++;
-			}
-		}
-		return removed;
-	}
-
-	@Override
-	public String toString() {
-		return "LightArrayList{" +
-						"internalList=" + internalList +
-						", db=" + db +
-						'}';
-	}
-}

src/main/java/org/warp/jcwdb/LightBigList.java

@@ -1,607 +0,0 @@
-package org.warp.jcwdb;
-
-import it.unimi.dsi.fastutil.ints.IntArrayList;
-import it.unimi.dsi.fastutil.longs.LongArrayList;
-import it.unimi.dsi.fastutil.objects.ObjectArrayList;
-
-import java.io.IOException;
-import java.util.*;
-import java.util.function.Consumer;
-import java.util.function.Predicate;
-import java.util.function.Supplier;
-
-public class LightBigList<T> implements LightList<T>, Saveable {
-
-	public static final int MAX_ELEMENTS_PER_CHUNK = 200000;
-
-	public final LongArrayList chunks;
-	public final IntArrayList chunkSizes;
-	private final JCWDatabase db;
-	private LightArrayList<T> cachedChunk;
-	private EntryReference<LightArrayList<T>> cachedChunkRef;
-	private long cachedChunkIndex = -1;
-	private int cachedChunkNumber = -1;
-	private final Object cachedChunkLock = new Object();
-
-	/**
-	 * @param db Database reference
-	 */
-	public LightBigList(JCWDatabase db) {
-		this.db = db;
-		this.chunks = new LongArrayList();
-		this.chunkSizes = new IntArrayList();
-	}
-
-	/**
-	 * @param db       Database reference
-	 * @param elements Elements to add
-	 */
-	public LightBigList(JCWDatabase db, LongArrayList elements) {
-		this.db = db;
-		this.chunks = new LongArrayList();
-		this.chunkSizes = new IntArrayList();
-		elements.forEach((long element) -> {
-			this.appendIndex(element);
-		});
-	}
-
-	public LightBigList(JCWDatabase db, LongArrayList chunks, IntArrayList chunkSizes) {
-		this.db = db;
-		this.chunks = chunks;
-		this.chunkSizes = chunkSizes;
-		if (this.chunks.size() > 0) {
-			prepareAccessToChunk(0);
-		}
-	}
-
-	private void prepareAccessToChunk(int chunkNumber) {
-		if (this.cachedChunkRef != null) {
-			this.cachedChunkRef.save();
-		}
-		this.cachedChunkNumber = chunkNumber;
-		this.cachedChunkIndex = this.chunks.getLong(chunkNumber);
-		try {
-			this.cachedChunkRef = db.get(this.cachedChunkIndex);
-		} catch (IOException ex) {
-			throw (NullPointerException) new NullPointerException().initCause(ex);
-		}
-		this.cachedChunk = this.cachedChunkRef.getValueReadOnlyUnsafe();
-	}
-
-	/**
-	 * Append an index to the first free chunk
-	 * @param elementIndex
-	 */
-	public void appendIndex(long elementIndex) {
-		for (int i = 0; i < chunks.size(); i++) {
-			final int chunkNumber = i;
-			if (MAX_ELEMENTS_PER_CHUNK - chunkSizes.getInt(i) > 0) {
-				synchronized (cachedChunkLock) {
-					if (cachedChunkNumber != i) {
-						prepareAccessToChunk(i);
-					}
-					cachedChunk.appendIndex(elementIndex);
-					chunkSizes.set(chunkNumber, cachedChunk.size());
-					return;
-				}
-			}
-		}
-		LightList<T> newChunk = new LightArrayList<>(db);
-		newChunk.appendIndex(elementIndex);
-		long newChunkIndex;
-		try {
-			newChunkIndex = db.add(newChunk).getIndex();
-		} catch (IOException ex) {
-			throw (NullPointerException) new NullPointerException().initCause(ex);
-		}
-		chunks.add(newChunkIndex);
-		chunkSizes.add(1);
-	}
-
-	/**
-	 * Get the elements count
-	 * @return the size of the list
-	 */
-	@Override
-	public int size() {
-		int size = 0;
-		for (int chunkSize : this.chunkSizes) {
-			size += chunkSize;
-		}
-		return size;
-	}
-
-	/**
-	 *
-	 * @return the count of chunks
-	 */
-	public int chunksCount() {
-		return this.chunkSizes.size();
-	}
-
-	/**
-	 * Check if the list is empty
-	 * @return true if the list is empty
-	 */
-	@Override
-	public boolean isEmpty() {
-		return this.size() <= 0;
-	}
-
-	@Override
-	public boolean contains(Object o) {
-		if (o != null) {
-			for (long chunkIndex : chunks) {
-				try {
-					EntryReference<LightArrayList<T>> chunkRef = db.get(chunkIndex);
-					LightArrayList<T> chunk = chunkRef.getValueReadOnlyUnsafe();
-					if (chunk.contains(o)) {
-						return true;
-					}
-				} catch (IOException ex) {
-					throw (NullPointerException) new NullPointerException().initCause(ex);
-				}
-			}
-		}
-		return false;
-	}
-
-	/**
-	 * Use iteratorReferences()
-	 */
-	@Deprecated
-	@Override
-	public Iterator<T> iterator()
-	{
-		throw new RuntimeException("iterator() isn't implemented!");
-	}
-
-	@Deprecated
-	@Override
-	public Iterator<EntryReference<T>> iteratorReferences() {
-		throw new RuntimeException("iteratorReferences() isn't implemented!");
-	}
-
-	/**
-	 * USE forEachReference INSTEAD, TO AVOID OUTOFMEMORY
-	 *
-	 * @param action
-	 */
-	@Deprecated
-	@Override
-	public void forEach(Consumer<? super T> action) {
-		throw new RuntimeException("forEach() isn't implemented! Use forEachReferences() instead");
-	}
-
-	@Override
-	public void forEachReference(Consumer<? super EntryReference<T>> action) {
-		Objects.requireNonNull(action);
-		// Iterate through all chunks
-		for (int i = 0; i < chunks.size(); i++) {
-			synchronized (cachedChunkLock) {
-				if (cachedChunkNumber != i) {
-					prepareAccessToChunk(i);
-				}
-				cachedChunk.forEachReference(action);
-			}
-		}
-	}
-
-	/**
-	 * toArray() isn't implemented! DO NOT USE IT.
-	 * @return
-	 */
-	@SuppressWarnings("unchecked")
-	@Deprecated
-	@Override
-	public T[] toArray() {
-		if (true) {
-			throw new RuntimeException("toArray() isn't implemented!");
-		}
-		T[] result = (T[]) new Object[this.size()];
-
-		long currentOffset = 0;
-		// Iterate through all chunks
-		for (int i = 0; i < chunks.size(); i++) {
-			final int currentChunkSize = chunkSizes.getInt(i);
-			final long chunkStartOffset = currentOffset;
-			currentOffset += currentChunkSize;
-			// Get chunk index
-			final long chunkIndex = chunks.getLong(i);
-
-			try {
-				EntryReference<LightArrayList<T>> chunkRef = db.get(chunkIndex);
-				LightArrayList<T> chunk = chunkRef.getValueReadOnlyUnsafe();
-				for (int i1 = 0; i1 < chunk.size(); i1++) {
-					result[(int)(chunkStartOffset + i1)] = chunk.get(i);
-				}
-			} catch (IOException ex) {
-				throw (NullPointerException) new NullPointerException().initCause(ex);
-			}
-		}
-		return result;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public <T1> T1[] toArray(T1[] a) {
-		throw new RuntimeException("toArray() isn't implemented!");
-	}
-
-	/**
-	 * Use addEntry(o)
-	 * @param o
-	 * @return
-	 */
-	@Deprecated
-	@Override
-	public boolean add(T o) {
-		EntryReference<T> ref = addEntry(o);
-		return ref != null;
-	}
-
-	@Override
-	public EntryReference<T> addEntry(T o) {
-		EntryReference<T> ref = addToDatabase(o);
-		appendIndex(ref.getIndex());
-		return ref;
-	}
-
-	@Override
-	public boolean remove(Object o) {
-		final int removeOffset = indexOf(o);
-		return removeAt(removeOffset) != null;
-	}
-
-	@Override
-	public boolean remove(EntryReference<T> ref) {
-		final int removeOffset = indexOfEntry(ref);
-		return removeAt(removeOffset) != null;
-	}
-
-	private T removeAt(int removeOffset) {
-		final VariableWrapper<T> result = new VariableWrapper<>(null);
-		long currentOffset = 0;
-		if (removeOffset >= 0) {
-			// Iterate through all chunks
-			for (int i = 0; i < chunks.size(); i++) {
-				final int currentChunkSize = chunkSizes.getInt(i);
-				final long chunkStartOffset = currentOffset;
-				currentOffset += currentChunkSize;
-				// If the offset to remove is in the current chunk
-				if (currentOffset > removeOffset) {
-					// Get chunk index
-					final long chunkIndex = chunks.getLong(i);
-					// Get the offset relative to the current chunk
-					final int relativeOffset = (int) (removeOffset - chunkStartOffset);
-
-					if (relativeOffset < 0) {
-						return null;
-					}
-
-					try {
-						EntryReference<LightArrayList<T>> chunkRef = db.get(chunkIndex);
-						chunkRef.editValue((chunk) -> {
-							result.var = chunk.remove(relativeOffset);
-						});
-					} catch (IOException ex) {
-						throw (NullPointerException) new NullPointerException().initCause(ex);
-					}
-					chunkSizes.set(removeOffset, currentChunkSize - 1);
-					break;
-				}
-			}
-			return result.var;
-		}
-		return null;
-	}
-
-	@Override
-	public boolean containsAll(Collection<?> c) {
-		for (Object o : c) {
-			int objIndex = indexOf(o);
-			if (objIndex < 0) {
-				return false;
-			}
-		}
-		return true;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public boolean addAll(Collection<? extends T> c) {
-		boolean result = false;
-		for (Object o : c) {
-			result |= add((T) o);
-		}
-		return result;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public boolean addAll(int index, Collection<? extends T> c) {
-		boolean result = false;
-		int delta = 0;
-		for (Object o : c) {
-			add(index + delta, (T) o);
-			result = true;
-			delta++;
-		}
-		return result;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public boolean removeAll(Collection<?> c) {
-		boolean result = false;
-		for (Object o : c) {
-			result |= remove((T) o);
-		}
-		return result;
-	}
-
-	@Override
-	public boolean retainAll(Collection<?> c) {
-		boolean result = false;
-		LongArrayList collectionHashes = new LongArrayList();
-		ObjectArrayList<Object> collection = new ObjectArrayList<>();
-		collection.addAll(c);
-		for (Object o : c) {
-			collectionHashes.add(db.calculateHash(o));
-		}
-		for (int i = 0; i < chunks.size(); i++) {
-			long hash = chunks.getLong(i);
-			int positionInCollection = collectionHashes.indexOf(hash);
-			if (positionInCollection == -1) {
-				remove(collection.get(positionInCollection));
-				result = true;
-			}
-		}
-		return result;
-	}
-
-	@Override
-	public void clear() {
-		chunks.clear();
-		chunkSizes.clear();
-	}
-
-	/**
-	 * Use getReference or getReadOnlyValue
-	 */
-	@Deprecated
-	@Override
-	public T get(int index) {
-		return getReadOnlyValue(index);
-	}
-
-	@SuppressWarnings("unchecked")
-	public T getReadOnlyValue(int index) {
-		try {
-			return (T) db.get(chunks.getLong(index)).getValueReadOnlyUnsafe();
-		} catch (IOException e) {
-			e.printStackTrace();
-			return null;
-		}
-	}
-
-	@Override
-	public EntryReference<T> getReference(int index) {
-		return getReferenceUnsafe(index, true);
-	}
-
-	@Override
-	public EntryReference<T> getReferenceOrInitialize(int index, Supplier<T> initializer) {
-		EntryReference<T> value = getReferenceUnsafe(index, false);
-		if (value != null) {
-			return value;
-		} else {
-			T initializedData = initializer.get();
-			EntryReference<T> initializedDataRef = addToDatabase(initializedData);
-			return set(index, initializedDataRef);
-		}
-	}
-
-	private EntryReference<T> getReferenceUnsafe(int index, boolean throwError) {
-		try {
-			return db.get(chunks.getLong(index)).cast();
-		} catch (IOException e) {
-			if (throwError) e.printStackTrace();
-			return null;
-		}
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public T set(int setOffset, final T element) {
-		return set(setOffset, addToDatabase(element)).getValueReadOnlyUnsafe();
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public EntryReference<T> set(int setOffset, final EntryReference<T> element) {
-		long nextChunkOffset = 0;
-		VariableWrapper<EntryReference<T>> wrapper = new VariableWrapper<>(null);
-		if (setOffset >= 0) {
-			// Iterate through all chunks
-			for (int i = 0; i < chunks.size(); i++) {
-				final int currentChunkSize = chunkSizes.getInt(i);
-				final long chunkStartOffset = nextChunkOffset;
-				nextChunkOffset += currentChunkSize;
-				// If the offset to remove is in the current chunk
-				if (nextChunkOffset > setOffset) {
-					// Get chunk index
-					final long chunkIndex = chunks.getLong(i);
-					// Get the offset relative to the current chunk
-					final int relativeOffset = (int) (setOffset - chunkStartOffset);
-
-					if (relativeOffset < 0) {
-						throw new NullPointerException("Relative Offset < 0");
-					}
-
-					try {
-						EntryReference<LightArrayList<T>> chunkRef = db.get(chunkIndex);
-						chunkRef.editValue((chunk) -> {
-							wrapper.var = chunk.set(relativeOffset, element);
-						});
-					} catch (IOException ex) {
-						throw (NullPointerException) new NullPointerException().initCause(ex);
-					}
-					break;
-				}
-			}
-			return wrapper.var;
-		}
-		return null;
-	}
-
-	@Override
-	public void add(int index, T element) {
-		throw new RuntimeException("add() isn't implemented!");
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public T remove(int index) {
-		return this.removeAt(index);
-	}
-
-	@Override
-	public int indexOf(Object o) {
-		EntryReference<T> ref = addToDatabase(o).cast();
-		return indexOfEntry(ref);
-	}
-
-	@Override
-	public int indexOfEntry(EntryReference<T> ref) {
-		int currentOffset = 0;
-		// Iterate through all chunks
-		for (int i = 0; i < chunks.size(); i++) {
-			try {
-				final int currentChunkSize = chunkSizes.getInt(i);
-				// If the offset to remove is in the current chunk
-
-				// Get chunk index
-				final long chunkIndex = chunks.getLong(i);
-				EntryReference<LightArrayList<T>> chunkRef = db.get(chunkIndex);
-				final int foundIndex = chunkRef.getValueReadOnlyUnsafe().indexOfEntry(ref);
-				if (foundIndex >= 0) {
-					return currentOffset + foundIndex;
-				}
-				currentOffset += currentChunkSize;
-			} catch (IOException ex) {
-				throw (NullPointerException) new NullPointerException().initCause(ex);
-			}
-		}
-		return -1;
-	}
-
-	@Override
-	public int lastIndexOf(Object o) {
-	return lastIndexOfEntry(addToDatabase(o).cast());
-	}
-
-	@Override
-	public int lastIndexOfEntry(EntryReference<T> ref) {
-		int currentOffset = 0;
-		// Iterate through all chunks
-		for (int i = chunks.size() - 1; i >= 0; i--) {
-			try {
-				final int currentChunkSize = chunkSizes.getInt(i);
-				// If the offset to remove is in the current chunk
-
-				// Get chunk index
-				final long chunkIndex = chunks.getLong(i);
-				EntryReference<LightArrayList<T>> chunkRef = db.get(chunkIndex);
-				final int foundIndex = chunkRef.getValueReadOnlyUnsafe().lastIndexOfEntry(ref);
-				if (foundIndex >= 0) {
-					return currentOffset + foundIndex;
-				}
-				currentOffset += currentChunkSize;
-			} catch (IOException ex) {
-				throw (NullPointerException) new NullPointerException().initCause(ex);
-			}
-		}
-		return -1;
-	}
-
-	@Deprecated
-	@Override
-	public ListIterator<T> listIterator() {
-		// TODO: implement
-		throw new RuntimeException("Not implemented!");
-	}
-
-	@Deprecated
-	@Override
-	public ListIterator<T> listIterator(int index) {
-		// TODO: implement
-		throw new RuntimeException("Not implemented!");
-	}
-
-	@Deprecated
-	@Override
-	public List<T> subList(int fromIndex, int toIndex) {
-		// TODO: implement
-		throw new RuntimeException("Not implemented!");
-	}
-
-	private <U> EntryReference<U> addToDatabase(U obj) {
-		EntryReference<U> ref;
-		try {
-			ref = db.add(obj);
-		} catch (IOException e) {
-			throw (NullPointerException) new NullPointerException().initCause(e);
-		}
-		return ref;
-	}
-
-	@Override
-	public int hashCode() {
-		final int prime = 31;
-		int result = 1;
-		result = prime * result + ((chunks == null) ? 0 : chunks.hashCode());
-		return result;
-	}
-
-	@SuppressWarnings("unchecked")
-	@Override
-	public boolean removeIf(Predicate<? super T> filter) {
-		Objects.requireNonNull(filter);
-		boolean result = false;
-		// Iterate through all chunks
-		for (int i = 0; i < chunks.size(); i++) {
-			synchronized (cachedChunkLock) {
-				if (cachedChunkNumber != i) {
-					prepareAccessToChunk(i);
-				}
-				if (cachedChunk.removeIf(filter)) {
-					result = true;
-					chunkSizes.set(cachedChunkNumber, cachedChunk.size());
-				}
-			}
-		}
-		return result;
-	}
-
-	@Override
-	public String toString() {
-		return "LightBigList{" +
-						"chunks=" + chunks +
-						", chunkSizes=" + chunkSizes +
-						", db=" + db +
-						'}';
-	}
-
-	@Override
-	public void save() {
-		if (this.cachedChunkRef != null) {
-			this.cachedChunkRef.save();
-		}
-	}
-
-	@Override
-	public void saveAndFlush() {
-		save();
-	}
-}

src/main/java/org/warp/jcwdb/LightList.java

@@ -1,29 +0,0 @@
-package org.warp.jcwdb;
-
-import java.util.Iterator;
-import java.util.List;
-import java.util.function.Consumer;
-import java.util.function.Supplier;
-
-public interface LightList<T> extends List<T> {
-
-	Iterator<EntryReference<T>> iteratorReferences();
-
-	void forEachReference(Consumer<? super EntryReference<T>> action);
-
-	EntryReference<T> addEntry(T o);
-
-	EntryReference<T> set(int setOffset, final EntryReference<T> element);
-
-	boolean remove(EntryReference<T> ref);
-
-	EntryReference<T> getReference(int index);
-
-	EntryReference<T> getReferenceOrInitialize(int index, Supplier<T> initializer);
-
-	int indexOfEntry(EntryReference<T> ref);
-
-	int lastIndexOfEntry(EntryReference<T> ref);
-
-	void appendIndex(long elementIndex);
-}

src/main/java/org/warp/jcwdb/MixedIndexDatabase.java

@@ -1,92 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.IOException;
-import java.nio.file.Path;
-
-public class MixedIndexDatabase implements IndexManager {
-	private final FileIndexManager fileIndices;
-	private final CacheIndexManager cacheIndices;
-
-	public MixedIndexDatabase(Path dataFile, Path metadataFile) throws IOException {
-		this.fileIndices = new FileIndexManager(dataFile, metadataFile);
-		this.cacheIndices = new CacheIndexManager();
-	}
-
-	@Override
-	public <T> T get(long index, DBReader<T> reader) throws IOException {
-		if (cacheIndices.has(index)) {
-			return cacheIndices.get(index, reader);
-		} else {
-			return fileIndices.get(index, reader);
-		}
-	}
-
-	@Override
-	public int getType(long index) throws IOException {
-		if (cacheIndices.has(index)) {
-			return cacheIndices.getType(index);
-		} else {
-			return fileIndices.getType(index);
-		}
-	}
-
-	@Override
-	public long getHash(long index) throws IOException {
-		if (cacheIndices.has(index)) {
-			return cacheIndices.getHash(index);
-		} else {
-			return fileIndices.getHash(index);
-		}
-	}
-
-	@Override
-	public <T> long add(DBDataOutput<T> writer) throws IOException {
-		return fileIndices.add(writer);
-	}
-
-
-	@Override
-	public <T> FullIndexDetails addAndGetDetails(DBDataOutput<T> writer) throws IOException {
-		return fileIndices.addAndGetDetails(writer);
-	}
-	@Override
-	public <T> IndexDetails set(long index, DBDataOutput<T> writer) throws IOException {
-		if (cacheIndices.has(index)) {
-			return cacheIndices.set(index, writer);
-		} else {
-			return fileIndices.set(index, writer);
-		}
-	}
-	@Override
-	public void setFlushingAllowed(long index, boolean isFlushingAllowed) {
-		if (cacheIndices.has(index)) {
-			cacheIndices.setFlushingAllowed(index, isFlushingAllowed);
-		} else {
-			fileIndices.setFlushingAllowed(index, isFlushingAllowed);
-		}
-	}
-
-	@Override
-	public void delete(long index) throws IOException {
-		cacheIndices.delete(index);
-		fileIndices.delete(index);
-	}
-
-	@Override
-	public boolean has(long index) {
-		return cacheIndices.has(index) || fileIndices.has(index);
-	}
-
-	@Override
-	public void close() throws IOException {
-		// TODO: move all cached indices to filesIndices before closing.
-		this.cacheIndices.close();
-		this.fileIndices.close();
-	}
-
-	@Override
-	public long clean() {
-		return fileIndices.clean()
-				+ cacheIndices.clean();
-	}
-}

src/main/java/org/warp/jcwdb/NoParserFoundException.java

@@ -1,14 +0,0 @@
-package org.warp.jcwdb;
-
-public class NoParserFoundException extends NullPointerException {
-
-	public NoParserFoundException(String string) {
-		super(string);
-	}
-
-	/**
-	 * 
-	 */
-	private static final long serialVersionUID = 701010818132241139L;
-
-}

src/main/java/org/warp/jcwdb/Saveable.java

@@ -1,8 +0,0 @@
-package org.warp.jcwdb;
-
-import java.io.IOException;
-
-public interface Saveable {
-	void save();
-	void saveAndFlush();
-}

src/main/java/org/warp/jcwdb/TypesManager.java

@@ -1,59 +0,0 @@
-package org.warp.jcwdb;
-
-import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
-import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
-import it.unimi.dsi.fastutil.objects.Object2ObjectMap;
-import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
-
-public class TypesManager {
-	private final Int2ObjectMap<DBTypeParser<?>> types;
-	private final Object2ObjectMap<Class<?>, DBTypeParser<?>> typesByClass;
-	private DBTypedObjectParser<?> fallbackParser;
-
-	public TypesManager(JCWDatabase db) {
-		types = new Int2ObjectOpenHashMap<>();
-		typesByClass = new Object2ObjectOpenHashMap<>();
-		DBStandardTypes.registerStandardTypes(db, this);
-	}
-
-	public <T> void registerType(Class<T> clazz, int type, DBTypeParser<T> parser) {
-		this.types.put(type, parser);
-		this.typesByClass.put(clazz, parser);
-	}
-
-	/**
-	 * Use this method with the most used classes to save disk space.
-	 * @param clazz
-	 * @param id
-	 * @param <T>
-	 */
-	public <T> void registerGenericClass(Class<T> clazz, int id) {
-		this.fallbackParser.registerClass(clazz, id);
-	}
-
-	public void registerTypeFallback(DBTypedObjectParser<?> parser) {
-		this.fallbackParser = parser;
-	}
-
-	public <T> DBTypeParser<T> get(int type) {
-		if (types.containsKey(type) == false) {
-			if (fallbackParser == null) {
-				throw new NoParserFoundException("The type " + type + " can't be parsed.");
-			} else {
-				return fallbackParser.cast();
-			}
-		}
-		return types.get(type).cast();
-	}
-
-	public <T> DBTypeParser<T> get(Class<T> type) {
-		if (typesByClass.containsKey(type) == false) {
-			if (fallbackParser == null) {
-				throw new NoParserFoundException("The class " + type.getSimpleName() + " can't be parsed.");
-			} else {
-				return fallbackParser.cast();
-			}
-		}
-		return typesByClass.get(type).cast();
-	}
-}

src/main/java/org/warp/jcwdb/VariableWrapper.java

@@ -1,7 +1,5 @@
 package org.warp.jcwdb;
 
-import java.nio.channels.SeekableByteChannel;
-
 public class VariableWrapper<T> {
 
 	public T var;

src/main/java/org/warp/jcwdb/ann/ConsumerWithIO.java

@@ -0,0 +1,15 @@
+package org.warp.jcwdb.ann;
+
+import java.io.IOException;
+import java.util.Objects;
+
+@FunctionalInterface
+public interface ConsumerWithIO<T> {
+
+	void accept(T t) throws IOException;
+
+	default ConsumerWithIO<T> andThen(ConsumerWithIO<? super T> after) {
+		Objects.requireNonNull(after);
+		return (T t) -> { accept(t); after.accept(t); };
+	}
+}

src/main/java/org/warp/jcwdb/ann/DBDataType.java

@@ -0,0 +1,13 @@
+package org.warp.jcwdb.ann;
+
+public enum DBDataType {
+	DATABASE_OBJECT,
+	OBJECT,
+	BOOLEAN,
+	BYTE,
+	SHORT,
+	CHAR,
+	INTEGER,
+	LONG,
+	REFERENCES_LIST
+}

src/main/java/org/warp/jcwdb/ann/DBField.java

@@ -0,0 +1,13 @@
+package org.warp.jcwdb.ann;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD})
+public @interface DBField {
+	int id();
+	DBDataType type() default DBDataType.OBJECT;
+}

src/main/java/org/warp/jcwdb/ann/DBPropertyGetter.java

@@ -0,0 +1,13 @@
+package org.warp.jcwdb.ann;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface DBPropertyGetter {
+	int id();
+	DBDataType type() default DBDataType.OBJECT;
+}

src/main/java/org/warp/jcwdb/ann/DBPropertySetter.java

@@ -0,0 +1,13 @@
+package org.warp.jcwdb.ann;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface DBPropertySetter {
+	int id();
+	DBDataType type() default DBDataType.OBJECT;
+}

src/main/java/org/warp/jcwdb/ann/RunnableWithIO.java

@@ -0,0 +1,19 @@
+package org.warp.jcwdb.ann;
+
+import java.io.IOException;
+
+@FunctionalInterface
+public interface RunnableWithIO {
+	/**
+	 * When an object implementing interface <code>Runnable</code> is used
+	 * to create a thread, starting the thread causes the object's
+	 * <code>run</code> method to be called in that separately executing
+	 * thread.
+	 * <p>
+	 * The general contract of the method <code>run</code> is that it may
+	 * take any action whatsoever.
+	 *
+	 * @see     java.lang.Thread#run()
+	 */
+	public abstract void run() throws IOException;
+}

src/main/java/org/warp/jcwdb/ann/SupplierWithIO.java

@@ -0,0 +1,8 @@
+package org.warp.jcwdb.ann;
+
+import java.io.IOException;
+
+@FunctionalInterface
+public interface SupplierWithIO<T> {
+	public T getWithIO() throws IOException;
+}

src/main/java/org/warp/jcwdb/exampleimpl/Animal.java

@@ -1,9 +0,0 @@
-package org.warp.jcwdb.exampleimpl;
-
-public abstract class Animal {
-	protected int legsCount;
-	
-	public static boolean hasFourLegs(Animal a) {
-		return a.legsCount == 4;
-	}
-}

src/main/java/org/warp/jcwdb/exampleimpl/App.java

@@ -1,101 +0,0 @@
-package org.warp.jcwdb.exampleimpl;
-
-import org.warp.jcwdb.EntryReference;
-import org.warp.jcwdb.JCWDatabase;
-import org.warp.jcwdb.LightList;
-
-import it.unimi.dsi.fastutil.objects.ObjectArrayList;
-import it.unimi.dsi.fastutil.objects.ObjectList;
-
-import java.io.IOException;
-import java.nio.file.Files;
-import java.nio.file.Paths;
-import java.util.function.Predicate;
-
-public class App {
-	static long time3;
-	public static void main(String[] args) throws IOException {
-		if (args.length > 2 && Boolean.parseBoolean(args[2])) {
-			Files.delete(Paths.get(args[0]));
-			Files.delete(Paths.get(args[1]));
-		}
-		System.out.println("Loading database...");
-		long time0 = System.currentTimeMillis();
-		JCWDatabase db = new JCWDatabase(Paths.get(args[0]), Paths.get(args[1]));
-		db.registerClass(StrangeAnimal.class, 0);
-		try {
-			long time01 = System.currentTimeMillis();
-			System.out.println("Time elapsed: " + (time01 - time0));
-			System.out.println("Loading root...");
-			EntryReference<LightList<Animal>> rootRef = db.getRoot(Animal.class);
-			rootRef.editValue((root, saver) -> {
-				long time1 = System.currentTimeMillis();
-				System.out.println("Time elapsed: " + (time1 - time01));
-				System.out.println("Root size: " + root.size());
-				System.out.println("Root:");
-//		for (int i = 0; i < root.size(); i++) {
-//			System.out.println(" - " + root.get(i));
-//		}
-				long prectime = System.currentTimeMillis();
-				for (int i = 0; i < 2000000/* 2000000 */; i++) {
-					Animal animal = new StrangeAnimal(i % 40);
-					root.addEntry(animal);
-					if (i > 0 && i % 200000 == 0) {
-						long precprectime = prectime;
-						prectime = System.currentTimeMillis();
-						System.out.println("Element " + i + " (" + (prectime - precprectime) + "ms)" + " Total Time: " + (prectime - time1));
-					}
-				}
-				long time2 = System.currentTimeMillis();
-				saver.save();
-				System.out.println("Root size: " + root.size());
-				System.out.println("Time elapsed: " + (time2 - time1));
-				System.out.println("Used memory: "
-								+ ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024) + "MB");
-				long time2_0 = System.currentTimeMillis();
-				System.out.println("Filtering strings...");
-				long oldSize = root.size();
-				root.removeIf(Animal::hasFourLegs);
-				long time2_1 = System.currentTimeMillis();
-				System.out.println("RemoveIf(x) removed items: " + (oldSize - root.size()));
-				System.out.println("Time elapsed: " + (time2_1 - time2_0));
-				ObjectList<Animal> results = new ObjectArrayList<>();
-
-				System.out.println("Retrieving items...");
-				root.forEachReference((valueReference) -> {
-					Animal value = valueReference.getValueReadOnlyUnsafe();
-					if (Animal.hasFourLegs(value)) {
-						results.add(value);
-					}
-					//System.out.println("val:" + value);
-				});
-				long time2_2 = System.currentTimeMillis();
-				System.out.println("Matches: " + results.size());
-				System.out.println("Time elapsed: " + (time2_2 - time2_1));
-				System.out.println("Used memory: "
-								+ ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024) + "MB");
-				System.out.println("Used memory: " + ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024) + "MB");
-				System.out.println("Cleaning database (to reduce the amount of used memory and detect memory leaks)...");
-				db.clean();
-				time3 = System.currentTimeMillis();
-				System.out.println("Used memory: " + ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / 1024 / 1024) + "MB");
-				System.out.println("Time elapsed: " + (time3 - time2_2));
-				System.out.println("Saving database...");
-				System.out.println("Root size: " + root.size());
-			});
-			db.close();
-			long time4 = System.currentTimeMillis();
-			System.out.println("Time elapsed: " + (time4 - time3));
-		} catch (Exception ex) {
-			ex.printStackTrace();
-		} finally {
-			if (db.isOpen()) {
-				db.close();
-			}
-		}
-	}
-
-	public static <T> Predicate<T> not(Predicate<T> t) {
-		return t.negate();
-	}
-}

src/main/java/org/warp/jcwdb/exampleimpl/Cat.java

@@ -1,12 +0,0 @@
-package org.warp.jcwdb.exampleimpl;
-
-public class Cat extends Animal {
-	public Cat() {
-		this.legsCount = 12;
-	}
-
-	@Override
-	public String toString() {
-		return "Cat [legsCount=" + legsCount + "]";
-	}
-}

src/main/java/org/warp/jcwdb/exampleimpl/Dog.java

@@ -1,12 +0,0 @@
-package org.warp.jcwdb.exampleimpl;
-
-public class Dog extends Animal {
-	public Dog() {
-		this.legsCount = 4;
-	}
-
-	@Override
-	public String toString() {
-		return "Dog [legsCount=" + legsCount + "]";
-	}
-}

src/main/java/org/warp/jcwdb/exampleimpl/StrangeAnimal.java

@@ -1,15 +0,0 @@
-package org.warp.jcwdb.exampleimpl;
-
-public class StrangeAnimal extends Animal {
-	public StrangeAnimal() {
-		super();
-	}
-	public StrangeAnimal(int legs) {
-		super();
-		this.legsCount = legs;
-	}
-	@Override
-	public String toString() {
-		return "StrangeAnimal [legsCount=" + legsCount + "]";
-	}
-}

src/test/java/org/warp/jcwdb/AppTest.java

@@ -1,18 +0,0 @@
-package org.warp.jcwdb;
-
-import org.junit.Test;
-
-import static org.junit.Assert.assertTrue;
-
-/**
- * Unit test for simple App.
- */
-public class AppTest {
-	/**
-	 * Rigorous Test :-)
-	 */
-	@Test
-	public void shouldAnswerWithTrue() {
-		assertTrue(true);
-	}
-}

src/test/java/org/warp/jcwdb/FileAllocatorTest.java

@@ -1,51 +0,0 @@
-package org.warp.jcwdb;
-
-import org.junit.Test;
-
-import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.nio.channels.SeekableByteChannel;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.StandardOpenOption;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertTrue;
-
-public class FileAllocatorTest {
-
-	@Test
-	public void shouldAllocateAtZero() throws IOException {
-		Path tempFile = Files.createTempFile("", "");
-		SeekableByteChannel byteCh = Files.newByteChannel(tempFile);
-		FileAllocator allocator = new FileAllocator(byteCh);
-		long offset1 = allocator.allocate(512);
-		assertEquals(0, offset1);
-	}
-
-	@Test
-	public void shouldAllocateAt512() throws IOException {
-		Path tempFile = Files.createTempFile("", "");
-		SeekableByteChannel byteCh = Files.newByteChannel(tempFile, StandardOpenOption.WRITE);
-		byteCh.write(ByteBuffer.wrap(new byte[512]));
-		FileAllocator allocator = new FileAllocator(byteCh);
-		long offset1 = allocator.allocate(512);
-		assertEquals(512, offset1);
-	}
-
-	@Test
-	public void shouldAllocateUnusedSpace() throws IOException {
-		Path tempFile = Files.createTempFile("", "");
-		SeekableByteChannel byteCh = Files.newByteChannel(tempFile, StandardOpenOption.WRITE);
-		FileAllocator allocator = new FileAllocator(byteCh);
-		long offset1 = allocator.allocate(512);
-		allocator.markFree(offset1, 512);
-		long offset2 = allocator.allocate(128);
-		long offset3 = allocator.allocate(512-128);
-		long offset4 = allocator.allocate(128);
-		assertEquals(0, offset2);
-		assertEquals(128, offset3);
-		assertEquals(512, offset4);
-	}
-
-}

src/test/java/org/warp/jcwdb/tests/NDBMultipleEnhancedObjects.java

@@ -0,0 +1,90 @@
+package org.warp.jcwdb.tests;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.warp.cowdb.EnhancedObject;
+import org.warp.cowdb.IDatabase;
+import org.warp.jcwdb.ann.DBDataType;
+import org.warp.jcwdb.ann.DBField;
+import org.warp.jcwdb.ann.DBPropertyGetter;
+import org.warp.jcwdb.ann.DBPropertySetter;
+import org.warp.jcwdb.utils.NTestUtils;
+
+import java.io.IOException;
+
+public class NDBMultipleEnhancedObjects {
+	private NTestUtils.WrappedDb db;
+	private RootTwoClasses root;
+
+	@Before
+	public void setUp() throws Exception {
+		db = NTestUtils.wrapDb().create((db) -> {
+			root = db.get().loadRoot(RootTwoClasses.class);
+		});
+		root.class1 = new NTestUtils.RootClass(db.get());
+		db.setRootClassValues(root.class1);
+		root.class2 = new NTestUtils.RootClass(db.get());
+		db.setRootClassValues(root.class2);
+		root.setClass3(new NTestUtils.RootClass(db.get()));
+		db.setRootClassValues(root.getClass3());
+		root.setClass4(new NTestUtils.RootClass(db.get()));
+		db.setRootClassValues(root.getClass4());
+		db.closeAndReopen();
+	}
+
+	@Test
+	public void shouldMatchMultipleEnhancedObjects() {
+		db.testRootClassValues(root.class1);
+		db.testRootClassValues(root.class2);
+		db.testRootClassValues(root.getClass3());
+		db.testRootClassValues(root.getClass4());
+	}
+
+	@After
+	public void tearDown() throws Exception {
+		db.delete();
+	}
+
+	public static class RootTwoClasses extends EnhancedObject {
+
+		@DBField(id = 0, type = DBDataType.DATABASE_OBJECT)
+		public NTestUtils.RootClass class1;
+
+		@DBField(id = 1, type = DBDataType.DATABASE_OBJECT)
+		public NTestUtils.RootClass class2;
+
+		public RootTwoClasses() {
+			super();
+		}
+
+		public RootTwoClasses(IDatabase database) throws IOException {
+			super(database);
+		}
+
+		@DBPropertyGetter(id = 0, type = DBDataType.DATABASE_OBJECT)
+		public NTestUtils.RootClass getClass3() {
+			return getProperty();
+		}
+
+		@DBPropertySetter(id = 0, type = DBDataType.DATABASE_OBJECT)
+		public void setClass3(NTestUtils.RootClass value) {
+			setProperty(value);
+		}
+
+		@DBPropertyGetter(id = 1, type = DBDataType.DATABASE_OBJECT)
+		public NTestUtils.RootClass getClass4() {
+			return getProperty();
+		}
+
+		@DBPropertySetter(id = 1, type = DBDataType.DATABASE_OBJECT)
+		public void setClass4(NTestUtils.RootClass value) {
+			setProperty(value);
+		}
+
+		@Override
+		public void initialize() throws IOException {
+
+		}
+	}
+}

src/test/java/org/warp/jcwdb/utils/ConsumerWithIO.java

@@ -0,0 +1,32 @@
+package org.warp.jcwdb.utils;
+
+import java.io.IOException;
+import java.util.Objects;
+
+@FunctionalInterface
+public interface ConsumerWithIO<T> {
+
+	/**
+	 * Performs this operation on the given argument.
+	 *
+	 * @param t the input argument
+	 */
+	void accept(T t) throws IOException;
+
+	/**
+	 * Returns a composed {@code Consumer} that performs, in sequence, this
+	 * operation followed by the {@code after} operation. If performing either
+	 * operation throws an exception, it is relayed to the caller of the
+	 * composed operation.  If performing this operation throws an exception,
+	 * the {@code after} operation will not be performed.
+	 *
+	 * @param after the operation to perform after this operation
+	 * @return a composed {@code Consumer} that performs in sequence this
+	 * operation followed by the {@code after} operation
+	 * @throws NullPointerException if {@code after} is null
+	 */
+	default ConsumerWithIO<T> andThen(ConsumerWithIO<? super T> after) {
+		Objects.requireNonNull(after);
+		return (T t) -> { accept(t); after.accept(t); };
+	}
+}

src/test/java/org/warp/jcwdb/utils/NSimplestClass.java

@@ -0,0 +1,27 @@
+package org.warp.jcwdb.utils;
+
+import org.warp.cowdb.Database;
+import org.warp.cowdb.EnhancedObject;
+import org.warp.jcwdb.ann.DBDataType;
+import org.warp.jcwdb.ann.DBField;
+
+import java.io.IOException;
+
+public class NSimplestClass extends EnhancedObject {
+
+	@DBField(id = 0, type = DBDataType.BOOLEAN)
+	public boolean field1;
+
+	public NSimplestClass() {
+
+	}
+
+	public NSimplestClass(Database database) throws IOException {
+		super(database);
+	}
+
+	@Override
+	public void initialize() throws IOException {
+		field1 = true;
+	}
+}

src/test/java/org/warp/jcwdb/utils/NTestUtils.java

@@ -0,0 +1,383 @@
+package org.warp.jcwdb.utils;
+
+import it.unimi.dsi.fastutil.longs.LongArrayList;
+import org.warp.cowdb.Database;
+import org.warp.cowdb.EnhancedObject;
+import org.warp.cowdb.IDatabase;
+import org.warp.jcwdb.ann.*;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Comparator;
+
+import static org.junit.Assert.*;
+
+public class NTestUtils {
+	public static WrappedDb wrapDb() {
+		return new WrappedDb();
+	}
+
+	public static class WrappedDb {
+
+		private Database db;
+		private Path tempDir;
+		private RunnableWithIO r;
+
+		private WrappedDb() {
+
+		}
+
+		public WrappedDb create() throws IOException {
+			tempDir = Files.createTempDirectory("tests-");
+			db = openDatabase();
+			if (r != null) {
+				r.run();
+			}
+			return this;
+		}
+
+		public WrappedDb create(ConsumerWithIO<NTestUtils.WrappedDb> r) throws IOException {
+			this.r = () -> r.accept(WrappedDb.this);
+			this.create();
+			return this;
+		}
+
+		private Database openDatabase() throws IOException {
+			return new Database(tempDir.resolve(Paths.get("data.db")), tempDir.resolve(Paths.get("blocks.dat")), tempDir.resolve(Paths.get("references.dat")));
+		}
+
+		public void delete() throws IOException {
+			db.close();
+			deleteDir(tempDir);
+		}
+
+		public Database get() {
+			return db;
+		}
+
+		private void deleteDir(Path p) throws IOException {
+			Files.walk(p)
+							.sorted(Comparator.reverseOrder())
+							.map(Path::toFile)
+							.forEach(File::delete);
+		}
+
+		public void closeAndReopen() throws IOException {
+			db.close();
+			db = openDatabase();
+			r.run();
+		}
+
+		public void setRootClassValues(RootClass root) throws IOException {
+			setRootClassFields(root);
+			setRootClassProperties(root);
+		}
+
+		public void setRootClassFields(RootClass root) throws IOException {
+			root.field1 = true;
+			root.field2 = 2;
+			root.field3 = 3;
+			root.field4 = 4;
+			root.field5 = 5;
+			root.field6 = 6;
+			root.field7 = "Test";
+			root.field8 = new LongArrayList();
+			root.field8.add(0);
+			root.field8.add(1);
+			root.field8.add(2);
+			root.field8.add(Long.MAX_VALUE/2);
+			root.field8.add(Long.MIN_VALUE/2);
+			root.field8.add(Long.MAX_VALUE);
+			root.field8.add(Long.MIN_VALUE);
+			root.field9 = new NSimplestClass(db);
+			root.field9.field1 = true;
+
+		}
+
+		public void setRootClassProperties(RootClass root) throws IOException {
+			root.set1(true);
+			root.set2((byte)2);
+			root.set3((short)3);
+			root.set4((char)4);
+			root.set5(5);
+			root.set6(6);
+			root.set7("Test");
+			LongArrayList lArrayList = new LongArrayList();
+			lArrayList.add(0);
+			lArrayList.add(1);
+			lArrayList.add(2);
+			lArrayList.add(Long.MAX_VALUE/2);
+			lArrayList.add(Long.MIN_VALUE/2);
+			lArrayList.add(Long.MAX_VALUE);
+			lArrayList.add(Long.MIN_VALUE);
+			root.set8(lArrayList);
+			NSimplestClass simplestClass9 = new NSimplestClass(db);
+			simplestClass9.field1 = true;
+			root.set9(simplestClass9);
+		}
+
+		public void testRootClassValues(RootClass root) {
+			testRootClassFields(root);
+			testRootClassProperties(root);
+		}
+
+		public void testRootClassFields(RootClass root) {
+			shouldGetFieldBoolean(root);
+			shouldGetFieldByte(root);
+			shouldGetFieldShort(root);
+			shouldGetFieldCharacter(root);
+			shouldGetFieldInteger(root);
+			shouldGetFieldLong(root);
+			shouldGetFieldObject(root);
+			shouldGetFieldUID(root);
+			shouldGetFieldDBObject(root);
+		}
+
+		public void testRootClassProperties(RootClass root) {
+			shouldGetPropertyBoolean(root);
+			shouldGetPropertyByte(root);
+			shouldGetPropertyShort(root);
+			shouldGetPropertyCharacter(root);
+			shouldGetPropertyInteger(root);
+			shouldGetPropertyLong(root);
+			shouldGetPropertyObject(root);
+			shouldGetPropertyUID(root);
+			shouldGetPropertyDBObject(root);
+		}
+
+
+		private void shouldGetFieldBoolean(RootClass root) {
+			assertTrue(root.field1);
+		}
+
+		private void shouldGetPropertyBoolean(RootClass root) {
+			assertTrue(root.get1());
+		}
+
+		private void shouldGetFieldByte(RootClass root) {
+			assertEquals(2, root.field2);
+		}
+
+		private void shouldGetPropertyByte(RootClass root) {
+			assertEquals(2, root.get2());
+		}
+
+		private void shouldGetFieldShort(RootClass root) {
+			assertEquals(3, root.field3);
+		}
+
+		private void shouldGetPropertyShort(RootClass root) {
+			assertEquals(3, root.get3());
+		}
+
+		private void shouldGetFieldCharacter(RootClass root) {
+			assertEquals(4, root.field4);
+		}
+
+		private void shouldGetPropertyCharacter(RootClass root) {
+			assertEquals(4, root.get4());
+		}
+
+		private void shouldGetFieldInteger(RootClass root) {
+			assertEquals(5, root.field5);
+		}
+
+		private void shouldGetPropertyInteger(RootClass root) {
+			assertEquals(5, root.get5());
+		}
+
+		private void shouldGetFieldLong(RootClass root) {
+			assertEquals(6, root.field6);
+		}
+
+		private void shouldGetPropertyLong(RootClass root) {
+			assertEquals(6, root.get6());
+		}
+
+		private void shouldGetFieldObject(RootClass root) {
+			shouldGetObject(root.field7);
+		}
+
+		private void shouldGetPropertyObject(RootClass root) {
+			shouldGetObject(root.get7());
+		}
+
+		private void shouldGetFieldDBObject(RootClass root) {
+			assertTrue(root.field9.field1);
+		}
+
+		private void shouldGetPropertyDBObject(RootClass root) {
+			assertTrue(root.get9().field1);
+		}
+
+		private void shouldGetObject(String val) {
+			assertNotNull(val);
+			assertEquals("Test", val);
+		}
+
+		private void shouldGetDBObject(NSimplestClass val) {
+			assertNotNull(val);
+			assertTrue(val.field1);
+		}
+
+		private void shouldGetFieldUID(RootClass root) {
+			shouldGetUID(root.field8);
+		}
+
+		private void shouldGetPropertyUID(RootClass root) {
+			shouldGetUID(root.get8());
+		}
+
+		private void shouldGetUID(LongArrayList val) {
+			assertNotNull(val);
+			assertEquals(7, val.size());
+			assertEquals(0, val.getLong(0));
+			assertEquals(val.getLong(5), Long.MAX_VALUE);
+			assertEquals(val.getLong(6), Long.MIN_VALUE);
+		}
+
+		public void onLoad(RunnableWithIO r) {
+			this.r = r;
+		}
+	}
+
+	public static class RootClass extends EnhancedObject {
+
+		@DBField(id = 0, type = DBDataType.BOOLEAN)
+		public boolean field1;
+
+		@DBField(id = 1, type = DBDataType.BYTE)
+		public byte field2;
+
+		@DBField(id = 2, type = DBDataType.SHORT)
+		public short field3;
+
+		@DBField(id = 3, type = DBDataType.CHAR)
+		public char field4;
+
+		@DBField(id = 4, type = DBDataType.INTEGER)
+		public int field5;
+
+		@DBField(id = 5, type = DBDataType.LONG)
+		public long field6;
+
+		@DBField(id = 6, type = DBDataType.OBJECT)
+		public String field7;
+
+		@DBField(id = 7, type = DBDataType.REFERENCES_LIST)
+		public LongArrayList field8;
+
+		@DBField(id = 8, type = DBDataType.DATABASE_OBJECT)
+		public NSimplestClass field9;
+
+		public RootClass() {
+
+		}
+
+		public RootClass(IDatabase database) throws IOException {
+			super(database);
+		}
+
+		@DBPropertyGetter(id = 0, type = DBDataType.BOOLEAN)
+		public boolean get1() {
+			return getProperty();
+		}
+
+		@DBPropertyGetter(id = 1, type = DBDataType.BYTE)
+		public byte get2() {
+			return getProperty();
+		}
+
+		@DBPropertyGetter(id = 2, type = DBDataType.SHORT)
+		public short get3() {
+			return getProperty();
+		}
+
+		@DBPropertyGetter(id = 3, type = DBDataType.CHAR)
+		public char get4() {
+			return getProperty();
+		}
+
+		@DBPropertyGetter(id = 4, type = DBDataType.INTEGER)
+		public int get5() {
+			return getProperty();
+		}
+
+		@DBPropertyGetter(id = 5, type = DBDataType.LONG)
+		public long get6() {
+			return getProperty();
+		}
+
+		@DBPropertyGetter(id = 6, type = DBDataType.OBJECT)
+		public String get7() {
+			return getProperty();
+		}
+
+		@DBPropertyGetter(id = 7, type = DBDataType.REFERENCES_LIST)
+		public LongArrayList get8() {
+			return getProperty();
+		}
+
+		@DBPropertyGetter(id = 8, type = DBDataType.DATABASE_OBJECT)
+		public NSimplestClass get9() {
+			return getProperty();
+		}
+
+		@DBPropertySetter(id = 0, type = DBDataType.BOOLEAN)
+		public void set1(boolean val) {
+			setProperty(val);
+		}
+
+		@DBPropertySetter(id = 1, type = DBDataType.BYTE)
+		public void set2(byte val) {
+			setProperty(val);
+		}
+
+		@DBPropertySetter(id = 2, type = DBDataType.SHORT)
+		public void set3(short val) {
+			setProperty(val);
+		}
+
+		@DBPropertySetter(id = 3, type = DBDataType.CHAR)
+		public void set4(char val) {
+			setProperty(val);
+		}
+
+		@DBPropertySetter(id = 4, type = DBDataType.INTEGER)
+		public void set5(int val) {
+			setProperty(val);
+		}
+
+		@DBPropertySetter(id = 5, type = DBDataType.LONG)
+		public void set6(long val) {
+			setProperty(val);
+		}
+
+		@DBPropertySetter(id = 6, type = DBDataType.OBJECT)
+		public void set7(String val) {
+			setProperty(val);
+		}
+
+		@DBPropertySetter(id = 7, type = DBDataType.REFERENCES_LIST)
+		public void set8(LongArrayList val) {
+			setProperty(val);
+		}
+
+		@DBPropertySetter(id = 8, type = DBDataType.DATABASE_OBJECT)
+		public void set9(NSimplestClass val) {
+			setProperty(val);
+		}
+
+		public boolean test() {
+			return true;
+		}
+
+		@Override
+		public void initialize() throws IOException {
+
+		}
+	}
+}