177 lines
5.0 KiB
Java
177 lines
5.0 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 io.net5.buffer.api.Buffer;
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import io.net5.buffer.api.Drop;
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import io.net5.buffer.api.Owned;
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import io.net5.buffer.api.Send;
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import io.net5.buffer.api.internal.ResourceSupport;
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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 org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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import org.rocksdb.ReadOptions;
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import org.rocksdb.RocksDBException;
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import reactor.core.publisher.Flux;
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public class LLLocalKeyPrefixReactiveRocksIterator extends
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ResourceSupport<LLLocalKeyPrefixReactiveRocksIterator, LLLocalKeyPrefixReactiveRocksIterator> {
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protected static final Logger logger = LogManager.getLogger(LLLocalKeyPrefixReactiveRocksIterator.class);
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private static final Drop<LLLocalKeyPrefixReactiveRocksIterator> DROP = new Drop<>() {
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@Override
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public void drop(LLLocalKeyPrefixReactiveRocksIterator obj) {
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try {
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if (obj.rangeShared != null) {
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obj.rangeShared.close();
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}
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} catch (Throwable ex) {
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logger.error("Failed to close range", ex);
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}
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try {
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if (obj.readOptions != null) {
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if (!(obj.readOptions instanceof UnreleasableReadOptions)) {
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obj.readOptions.close();
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}
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}
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} catch (Throwable ex) {
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logger.error("Failed to close readOptions", ex);
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}
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}
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@Override
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public Drop<LLLocalKeyPrefixReactiveRocksIterator> fork() {
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return this;
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}
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@Override
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public void attach(LLLocalKeyPrefixReactiveRocksIterator obj) {
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}
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};
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private final RocksDBColumn db;
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private final int prefixLength;
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private LLRange rangeShared;
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private final boolean allowNettyDirect;
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private ReadOptions readOptions;
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private final boolean canFillCache;
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public LLLocalKeyPrefixReactiveRocksIterator(RocksDBColumn db,
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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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super(DROP);
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try (range) {
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this.db = db;
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this.prefixLength = prefixLength;
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this.rangeShared = 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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}
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}
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public Flux<Send<Buffer>> flux() {
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return Flux.generate(() -> {
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var readOptions = new ReadOptions(this.readOptions);
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if (!rangeShared.hasMin() || !rangeShared.hasMax()) {
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readOptions.setReadaheadSize(32 * 1024); // 32KiB
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readOptions.setFillCache(canFillCache);
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}
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} started", LLUtils.toStringSafe(rangeShared));
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}
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return LLLocalDictionary.getRocksIterator(allowNettyDirect, readOptions, rangeShared, db);
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}, (tuple, sink) -> {
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try {
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var rocksIterator = tuple.iterator();
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rocksIterator.status();
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Buffer firstGroupKey = null;
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try {
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while (rocksIterator.isValid()) {
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Buffer key;
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if (allowNettyDirect) {
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key = LLUtils.readDirectNioBuffer(db.getAllocator(), rocksIterator::key);
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} else {
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key = LLUtils.fromByteArray(db.getAllocator(), rocksIterator.key());
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}
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try (key) {
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if (firstGroupKey == null) {
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firstGroupKey = key.copy();
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} else if (!LLUtils.equals(firstGroupKey,
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firstGroupKey.readerOffset(),
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key,
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key.readerOffset(),
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prefixLength
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)) {
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break;
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}
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rocksIterator.next();
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rocksIterator.status();
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}
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}
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if (firstGroupKey != null) {
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assert firstGroupKey.isAccessible();
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var groupKeyPrefix = firstGroupKey.copy(firstGroupKey.readerOffset(), prefixLength);
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assert groupKeyPrefix.isAccessible();
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB,
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"Range {} is reading prefix {}",
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LLUtils.toStringSafe(rangeShared),
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LLUtils.toStringSafe(groupKeyPrefix)
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);
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}
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sink.next(groupKeyPrefix.send());
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} else {
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} ended", LLUtils.toStringSafe(rangeShared));
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}
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sink.complete();
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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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} catch (RocksDBException ex) {
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if (logger.isTraceEnabled()) {
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logger.trace(MARKER_ROCKSDB, "Range {} failed", LLUtils.toStringSafe(rangeShared));
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}
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sink.error(ex);
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}
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return tuple;
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}, RocksIteratorTuple::close);
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}
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@Override
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protected final RuntimeException createResourceClosedException() {
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return new IllegalStateException("Closed");
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}
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@Override
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protected Owned<LLLocalKeyPrefixReactiveRocksIterator> prepareSend() {
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var range = this.rangeShared.send();
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var readOptions = new ReadOptions(this.readOptions);
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return drop -> new LLLocalKeyPrefixReactiveRocksIterator(db,
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prefixLength,
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range,
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allowNettyDirect,
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readOptions,
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canFillCache
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);
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}
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protected void makeInaccessible() {
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this.rangeShared = null;
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this.readOptions = null;
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}
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}
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