115 lines
3.3 KiB
Java
115 lines
3.3 KiB
Java
package it.cavallium.dbengine.database.disk;
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import io.net5.buffer.api.Buffer;
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import io.net5.buffer.api.BufferAllocator;
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import io.net5.buffer.api.Send;
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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.unimi.dsi.fastutil.objects.ObjectArrayList;
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import java.util.List;
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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 reactor.core.publisher.Flux;
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public abstract class LLLocalGroupedReactiveRocksIterator<T> {
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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 int prefixLength;
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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 canFillCache;
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private final boolean readValues;
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public LLLocalGroupedReactiveRocksIterator(RocksDB db, BufferAllocator alloc, ColumnFamilyHandle cfh,
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int prefixLength,
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Send<LLRange> range,
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boolean allowNettyDirect,
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ReadOptions readOptions,
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boolean canFillCache,
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boolean readValues) {
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try (range) {
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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.prefixLength = prefixLength;
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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.canFillCache = canFillCache;
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this.readValues = readValues;
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}
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}
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public Flux<List<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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readOptions.setFillCache(canFillCache && range.hasMin() && range.hasMax());
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return LLLocalDictionary.getRocksIterator(alloc, 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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ObjectArrayList<T> values = new ObjectArrayList<>();
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Buffer firstGroupKey = null;
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try {
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rocksIterator.status();
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while (rocksIterator.isValid()) {
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try (Buffer key = LLUtils.readDirectNioBuffer(alloc, rocksIterator::key).receive()) {
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if (firstGroupKey == null) {
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firstGroupKey = key.copy();
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} else if (!LLUtils.equals(firstGroupKey, firstGroupKey.readerOffset(),
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key, key.readerOffset(), prefixLength)) {
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break;
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}
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Buffer value;
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if (readValues) {
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value = LLUtils.readDirectNioBuffer(alloc, rocksIterator::value).receive();
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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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T entry = getEntry(key.send(), value.send());
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values.add(entry);
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} finally {
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value.close();
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}
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}
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}
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} finally {
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if (firstGroupKey != null) {
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firstGroupKey.close();
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}
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}
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if (!values.isEmpty()) {
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sink.next(values);
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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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tuple.getT4().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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range.close();
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}
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}
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