112 lines
3.1 KiB
Java
112 lines
3.1 KiB
Java
package it.cavallium.dbengine.database.disk;
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import static it.cavallium.dbengine.database.LLUtils.generateCustomReadOptions;
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import io.netty5.buffer.api.Drop;
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import io.netty5.buffer.api.Owned;
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import io.netty5.buffer.api.Send;
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import io.netty5.buffer.api.internal.ResourceSupport;
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import it.cavallium.dbengine.database.LLRange;
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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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import reactor.util.function.Tuples;
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public final class LLLocalMigrationReactiveRocksIterator extends
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ResourceSupport<LLLocalMigrationReactiveRocksIterator, LLLocalMigrationReactiveRocksIterator> {
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protected static final Logger logger = LogManager.getLogger(LLLocalMigrationReactiveRocksIterator.class);
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private static final Drop<LLLocalMigrationReactiveRocksIterator> DROP = new Drop<>() {
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@Override
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public void drop(LLLocalMigrationReactiveRocksIterator 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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obj.readOptions.close();
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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<LLLocalMigrationReactiveRocksIterator> fork() {
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return this;
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}
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@Override
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public void attach(LLLocalMigrationReactiveRocksIterator obj) {
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}
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};
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private final RocksDBColumn db;
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private LLRange rangeShared;
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private ReadOptions readOptions;
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@SuppressWarnings({"unchecked", "rawtypes"})
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public LLLocalMigrationReactiveRocksIterator(RocksDBColumn db,
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Send<LLRange> range,
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ReadOptions readOptions) {
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super((Drop<LLLocalMigrationReactiveRocksIterator>) (Drop) DROP);
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try (range) {
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this.db = db;
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this.rangeShared = range.receive();
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this.readOptions = readOptions;
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}
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}
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public record ByteEntry(byte[] key, byte[] value) {}
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public Flux<ByteEntry> flux() {
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return Flux.generate(() -> {
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var readOptions = generateCustomReadOptions(this.readOptions, false, false, false);
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return new RocksIterWithReadOpts(readOptions, db.newRocksIterator(false, readOptions, rangeShared, false));
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}, (tuple, sink) -> {
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try {
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//noinspection resource
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var rocksIterator = tuple.iter().iterator();
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if (rocksIterator.isValid()) {
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byte[] key = rocksIterator.key();
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byte[] value = rocksIterator.value();
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rocksIterator.next(false);
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sink.next(new ByteEntry(key, value));
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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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}, RocksIterWithReadOpts::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<LLLocalMigrationReactiveRocksIterator> prepareSend() {
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var range = this.rangeShared.send();
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var readOptions = this.readOptions;
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return drop -> new LLLocalMigrationReactiveRocksIterator(db,
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range,
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readOptions
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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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