132 lines
4.5 KiB
Java
132 lines
4.5 KiB
Java
package it.cavallium.dbengine.database.disk;
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import static it.cavallium.dbengine.database.LLUtils.MARKER_ROCKSDB;
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import static it.cavallium.dbengine.database.LLUtils.generateCustomReadOptions;
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import static it.cavallium.dbengine.database.LLUtils.isBoundedRange;
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import static it.cavallium.dbengine.utils.StreamUtils.resourceStream;
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import it.cavallium.buffer.Buf;
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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.disk.rocksdb.LLReadOptions;
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import it.cavallium.dbengine.database.disk.rocksdb.RocksIteratorObj;
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import it.cavallium.dbengine.utils.DBException;
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import it.cavallium.dbengine.utils.StreamUtils;
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import it.unimi.dsi.fastutil.objects.ObjectArrayList;
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import java.io.IOException;
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import java.util.List;
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import java.util.Objects;
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import java.util.concurrent.CompletionException;
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import java.util.function.Supplier;
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import java.util.stream.Stream;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.jetbrains.annotations.NotNull;
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import org.jetbrains.annotations.Nullable;
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import org.rocksdb.ReadOptions;
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import org.rocksdb.RocksDBException;
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public abstract class LLLocalGroupedReactiveRocksIterator<T> {
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protected static final Logger logger = LogManager.getLogger(LLLocalGroupedReactiveRocksIterator.class);
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private final RocksDBColumn db;
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private final int prefixLength;
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private final LLRange range;
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private final Supplier<LLReadOptions> readOptions;
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private final boolean canFillCache;
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private final boolean readValues;
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private final boolean smallRange;
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public LLLocalGroupedReactiveRocksIterator(RocksDBColumn db,
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int prefixLength,
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LLRange range,
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Supplier<LLReadOptions> readOptions,
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boolean canFillCache,
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boolean readValues,
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boolean smallRange) {
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this.db = db;
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this.prefixLength = prefixLength;
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this.range = range;
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this.readOptions = readOptions != null ? readOptions : LLReadOptions::new;
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this.canFillCache = canFillCache;
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this.readValues = readValues;
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this.smallRange = smallRange;
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}
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public final Stream<List<T>> stream() {
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try {
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return resourceStream(
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() -> generateCustomReadOptions(this.readOptions.get(), canFillCache, isBoundedRange(range), smallRange),
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readOptions -> StreamUtils.resourceStream(
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() -> db.newRocksIterator(readOptions, range, false),
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rocksIterator -> StreamUtils.streamWhileNonNull(() -> {
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try {
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} started", LLUtils.toStringSafe(range));
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}
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ObjectArrayList<T> values = new ObjectArrayList<>();
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Buf firstGroupKey = null;
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while (rocksIterator.isValid()) {
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// Note that the underlying array is subject to changes!
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Buf key = rocksIterator.keyBuf();
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if (firstGroupKey == null) {
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firstGroupKey = key.copy();
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} else if (!LLUtils.equals(firstGroupKey, 0, key, 0, prefixLength)) {
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break;
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}
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// Note that the underlying array is subject to changes!
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@Nullable Buf value;
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if (readValues) {
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value = rocksIterator.valueBuf();
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} else {
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value = null;
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}
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB,
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"Range {} is reading {}: {}",
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LLUtils.toStringSafe(range),
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LLUtils.toStringSafe(key),
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LLUtils.toStringSafe(value)
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);
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}
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rocksIterator.next();
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T entry = getEntry(key, value);
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values.add(entry);
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}
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if (!values.isEmpty()) {
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return values;
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} else {
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} ended", LLUtils.toStringSafe(range));
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}
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return null;
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}
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} catch (RocksDBException ex) {
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throw new CompletionException(generateRangeFailedException(ex));
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}
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})
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)
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);
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} catch (RocksDBException ex) {
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throw generateRangeFailedException(ex);
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}
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}
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private DBException generateRangeFailedException(RocksDBException ex) {
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} failed", LLUtils.toStringSafe(range));
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}
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throw new DBException("Range failed", ex);
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}
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/**
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* @param key this buffer content will be changed during the next iteration
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* @param value this buffer content will be changed during the next iteration
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*/
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public abstract T getEntry(@Nullable Buf key, @Nullable Buf value);
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}
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