59 lines
1.9 KiB
Java
59 lines
1.9 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.Drop;
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import io.netty5.buffer.Owned;
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import io.netty5.util.Send;
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import io.netty5.buffer.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 it.cavallium.dbengine.utils.SimpleResource;
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import java.util.function.Supplier;
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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.core.publisher.Mono;
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import reactor.util.function.Tuples;
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public final class LLLocalMigrationReactiveRocksIterator {
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private final RocksDBColumn db;
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private Mono<LLRange> rangeMono;
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private Supplier<ReadOptions> readOptions;
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public LLLocalMigrationReactiveRocksIterator(RocksDBColumn db,
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Mono<LLRange> rangeMono,
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Supplier<ReadOptions> readOptions) {
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this.db = db;
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this.rangeMono = rangeMono;
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this.readOptions = readOptions;
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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.usingWhen(rangeMono, range -> Flux.generate(() -> {
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var readOptions = generateCustomReadOptions(this.readOptions.get(), false, false, false);
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return new RocksIterWithReadOpts(readOptions, db.newRocksIterator(false, readOptions, range, false));
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}, (tuple, sink) -> {
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try {
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var rocksIterator = tuple.iter();
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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), LLUtils::finalizeResource);
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}
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}
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