111 lines
3.3 KiB
Java
111 lines
3.3 KiB
Java
package it.cavallium.dbengine.database.disk;
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import static it.cavallium.dbengine.database.disk.LLLocalDictionary.getRocksIterator;
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import io.netty.buffer.api.Buffer;
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import io.netty.buffer.api.BufferAllocator;
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import io.netty.buffer.api.Send;
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import io.netty.util.IllegalReferenceCountException;
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import it.cavallium.dbengine.database.LLRange;
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import it.cavallium.dbengine.database.LLUtils;
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import it.cavallium.dbengine.database.collections.DatabaseMapDictionaryDeep;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicInteger;
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import org.jetbrains.annotations.NotNull;
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import org.rocksdb.ColumnFamilyHandle;
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import org.rocksdb.ReadOptions;
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import org.rocksdb.RocksDB;
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import org.rocksdb.RocksDBException;
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import org.rocksdb.RocksIterator;
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import org.rocksdb.RocksMutableObject;
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import reactor.core.publisher.Flux;
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import reactor.util.function.Tuple3;
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import static io.netty.buffer.Unpooled.*;
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import static it.cavallium.dbengine.database.disk.LLLocalDictionary.logger;
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public abstract class LLLocalReactiveRocksIterator<T> {
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private final AtomicBoolean released = new AtomicBoolean(false);
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private final RocksDB db;
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private final BufferAllocator alloc;
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private final ColumnFamilyHandle cfh;
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private final LLRange range;
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private final boolean allowNettyDirect;
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private final ReadOptions readOptions;
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private final boolean readValues;
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private final String debugName;
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public LLLocalReactiveRocksIterator(RocksDB db,
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BufferAllocator alloc,
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ColumnFamilyHandle cfh,
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Send<LLRange> range,
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boolean allowNettyDirect,
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ReadOptions readOptions,
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boolean readValues,
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String debugName) {
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this.db = db;
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this.alloc = alloc;
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this.cfh = cfh;
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this.range = range.receive();
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this.allowNettyDirect = allowNettyDirect;
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this.readOptions = readOptions;
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this.readValues = readValues;
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this.debugName = debugName;
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}
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public Flux<T> flux() {
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return Flux
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.generate(() -> {
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var readOptions = new ReadOptions(this.readOptions);
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if (!range.hasMin() || !range.hasMax()) {
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readOptions.setReadaheadSize(32 * 1024); // 32KiB
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readOptions.setFillCache(false);
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}
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return getRocksIterator(allowNettyDirect, readOptions, range.copy().send(), db, cfh);
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}, (tuple, sink) -> {
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try {
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var rocksIterator = tuple.getT1();
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rocksIterator.status();
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if (rocksIterator.isValid()) {
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try (Buffer key = LLUtils.readDirectNioBuffer(alloc, rocksIterator::key)) {
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Buffer value;
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if (readValues) {
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value = LLUtils.readDirectNioBuffer(alloc, rocksIterator::value);
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} else {
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value = alloc.allocate(0);
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}
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try {
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rocksIterator.next();
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rocksIterator.status();
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sink.next(getEntry(key.send(), value.send()));
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} finally {
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value.close();
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}
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}
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} else {
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sink.complete();
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}
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} catch (RocksDBException ex) {
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sink.error(ex);
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}
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return tuple;
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}, tuple -> {
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var rocksIterator = tuple.getT1();
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rocksIterator.close();
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tuple.getT2().close();
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tuple.getT3().close();
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});
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}
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public abstract T getEntry(Send<Buffer> key, Send<Buffer> value);
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public void release() {
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if (released.compareAndSet(false, true)) {
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range.close();
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} else {
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throw new IllegalReferenceCountException(0, -1);
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}
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}
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}
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