65 lines
2.1 KiB
Java
65 lines
2.1 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 static it.cavallium.dbengine.utils.StreamUtils.resourceStream;
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import static it.cavallium.dbengine.utils.StreamUtils.streamWhileNonNull;
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import it.cavallium.buffer.Buf;
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import it.cavallium.dbengine.database.LLEntry;
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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.database.disk.rocksdb.LLReadOptions;
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import it.cavallium.dbengine.database.disk.rocksdb.RocksIteratorObj;
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import it.cavallium.dbengine.utils.DBException;
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import java.io.IOException;
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import java.util.Objects;
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import java.util.concurrent.CompletionException;
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import java.util.function.Supplier;
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import java.util.stream.Stream;
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import org.jetbrains.annotations.NotNull;
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import org.rocksdb.ReadOptions;
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import org.rocksdb.RocksDBException;
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public final class LLLocalMigrationReactiveRocksIterator {
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private final RocksDBColumn db;
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private final LLRange range;
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private final Supplier<LLReadOptions> readOptions;
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public LLLocalMigrationReactiveRocksIterator(RocksDBColumn db,
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LLRange range,
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Supplier<LLReadOptions> readOptions) {
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this.db = db;
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this.range = range;
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this.readOptions = readOptions;
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}
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public Stream<LLEntry> stream() {
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try {
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return resourceStream(
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// Create the read options
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() -> generateCustomReadOptions(this.readOptions.get(), false, false, false),
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readOptions -> resourceStream(
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// Create the iterator
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() -> db.newRocksIterator(readOptions, range, false),
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// Stream the iterator values until null is returned
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iterator -> streamWhileNonNull(() -> {
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if (iterator.isValid()) {
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var key = iterator.keyBuf().copy();
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var value = iterator.valueBuf().copy();
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try {
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iterator.next(false);
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} catch (RocksDBException e) {
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throw new CompletionException(e);
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}
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return LLEntry.of(key, value);
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} else {
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return null;
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}
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})));
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} catch (RocksDBException e) {
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throw new DBException("Failed to open iterator", e);
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}
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}
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}
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