131 lines
3.9 KiB
Java
131 lines
3.9 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 io.netty5.buffer.Buffer;
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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 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.jetbrains.annotations.Nullable;
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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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public abstract class LLLocalReactiveRocksIterator<T> {
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protected static final Logger logger = LogManager.getLogger(LLLocalReactiveRocksIterator.class);
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private final RocksDBColumn db;
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private final Mono<LLRange> rangeMono;
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private final boolean allowNettyDirect;
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private final Supplier<ReadOptions> readOptions;
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private final boolean readValues;
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private final boolean reverse;
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private final boolean smallRange;
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public LLLocalReactiveRocksIterator(RocksDBColumn db,
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Mono<LLRange> rangeMono,
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boolean allowNettyDirect,
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Supplier<ReadOptions> readOptions,
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boolean readValues,
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boolean reverse,
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boolean smallRange) {
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this.db = db;
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this.rangeMono = rangeMono;
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this.allowNettyDirect = allowNettyDirect;
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this.readOptions = readOptions != null ? readOptions : ReadOptions::new;
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this.readValues = readValues;
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this.reverse = reverse;
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this.smallRange = smallRange;
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}
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public final Flux<T> flux() {
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return Flux.usingWhen(rangeMono, range -> Flux.generate(() -> {
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var readOptions = generateCustomReadOptions(this.readOptions.get(), true, isBoundedRange(range), smallRange);
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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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return new RocksIterWithReadOpts(readOptions, db.newRocksIterator(allowNettyDirect, readOptions, range, reverse));
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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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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 {
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Buffer value;
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if (readValues) {
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if (allowNettyDirect) {
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value = LLUtils.readDirectNioBuffer(db.getAllocator(), rocksIterator::value);
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} else {
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value = LLUtils.fromByteArray(db.getAllocator(), rocksIterator.value());
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}
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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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try {
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if (reverse) {
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rocksIterator.prev();
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} else {
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rocksIterator.next();
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}
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sink.next(getEntry(key, value));
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} catch (Throwable ex) {
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if (value != null && value.isAccessible()) {
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try {
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value.close();
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} catch (Throwable ex2) {
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logger.error(ex2);
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}
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}
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throw ex;
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}
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} catch (Throwable ex) {
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if (key.isAccessible()) {
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try {
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key.close();
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} catch (Throwable ex2) {
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logger.error(ex2);
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}
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}
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throw ex;
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}
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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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sink.complete();
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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(range));
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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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}, RocksIterWithReadOpts::close), LLUtils::finalizeResource);
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}
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public abstract T getEntry(@Nullable Buffer key, @Nullable Buffer value);
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}
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