70 lines
2.0 KiB
Java
70 lines
2.0 KiB
Java
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package it.cavallium.dbengine.database.disk;
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import it.cavallium.dbengine.database.LLRange;
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import org.jetbrains.annotations.NotNull;
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import org.rocksdb.AbstractImmutableNativeReference;
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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.Slice;
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import reactor.core.CoreSubscriber;
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import reactor.core.publisher.Flux;
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public abstract class LLLocalLuceneReactiveIterator<T> extends Flux<T> {
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private static final byte[] EMPTY = new byte[0];
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private final RocksDB db;
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private final ColumnFamilyHandle cfh;
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private final LLRange range;
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private final ReadOptions readOptions;
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private final boolean readValues;
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public LLLocalLuceneReactiveIterator(RocksDB db,
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ColumnFamilyHandle cfh,
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LLRange range,
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ReadOptions readOptions,
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boolean readValues) {
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this.db = db;
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this.cfh = cfh;
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this.range = range;
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this.readOptions = readOptions;
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this.readValues = readValues;
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}
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@Override
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public void subscribe(@NotNull CoreSubscriber<? super T> actual) {
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Flux<T> flux = Flux
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.generate(() -> {
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var readOptions = new ReadOptions(this.readOptions);
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readOptions.setFillCache(range.hasMin() && range.hasMax());
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if (range.hasMin()) {
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readOptions.setIterateLowerBound(new Slice(range.getMin()));
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}
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if (range.hasMax()) {
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readOptions.setIterateUpperBound(new Slice(range.getMax()));
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}
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var rocksIterator = db.newIterator(cfh, readOptions);
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if (range.hasMin()) {
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rocksIterator.seek(range.getMin());
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} else {
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rocksIterator.seekToFirst();
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}
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return rocksIterator;
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}, (rocksIterator, sink) -> {
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if (rocksIterator.isValid()) {
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byte[] key = rocksIterator.key();
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byte[] value = readValues ? rocksIterator.value() : EMPTY;
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rocksIterator.next();
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sink.next(getEntry(key, value));
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} else {
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sink.complete();
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}
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return rocksIterator;
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}, AbstractImmutableNativeReference::close);
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flux.subscribe(actual);
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}
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public abstract T getEntry(byte[] key, byte[] value);
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}
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