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SirixDB is a hybrid on-disk and in-memory document oriented, versioned database system. It has a lightweight buffer manager, stores everything in a huge persistent and durable tree and allows efficient reconstruction of every revision. Furthermore, SirixDB implements change tracking, diffing and supports time travel queries.
package io.sirix.node;
import io.sirix.node.interfaces.DeweyIdSerializer;
import net.openhft.chronicle.bytes.BytesIn;
import net.openhft.chronicle.bytes.BytesOut;
import org.checkerframework.checker.index.qual.NonNegative;
import org.checkerframework.checker.nullness.qual.NonNull;
import io.sirix.access.ResourceConfiguration;
import io.sirix.api.PageReadOnlyTrx;
import io.sirix.node.interfaces.DataRecord;
import java.nio.ByteBuffer;
import java.util.Arrays;
/**
* Serialize and deserialize nodes.
*
* @author Johannes Lichtenberger
*/
public final class NodeSerializerImpl implements DeweyIdSerializer {
@Override
public @NonNull DataRecord deserialize(final BytesIn> source, final @NonNegative long recordID, final byte[] deweyID,
final PageReadOnlyTrx pageReadTrx) {
final byte id = source.readByte();
final NodeKind enumKind = NodeKind.getKind(id);
return enumKind.deserialize(source, recordID, deweyID, pageReadTrx);
}
@Override
public void serialize(final BytesOut sink, final DataRecord record, final PageReadOnlyTrx pageReadTrx) {
final NodeKind nodeKind = (NodeKind) record.getKind();
final byte id = nodeKind.getId();
sink.writeByte(id);
nodeKind.serialize(sink, record, pageReadTrx);
}
@Override
public byte[] deserializeDeweyID(BytesIn> source, byte[] previousDeweyID,
ResourceConfiguration resourceConfig) {
if (resourceConfig.areDeweyIDsStored) {
if (previousDeweyID != null) {
final int cutOffSize = source.readByte();
final int size = source.readByte();
final byte[] deweyIDBytes = new byte[size];
source.read(deweyIDBytes);
final byte[] bytes = new byte[cutOffSize + deweyIDBytes.length];
final ByteBuffer target = ByteBuffer.wrap(bytes);
target.put(Arrays.copyOfRange(previousDeweyID, 0, cutOffSize));
target.put(deweyIDBytes);
return bytes;
} else {
final byte deweyIDLength = source.readByte();
final byte[] deweyIDBytes = new byte[deweyIDLength];
source.read(deweyIDBytes, 0, deweyIDLength);
return deweyIDBytes;
}
}
return null;
}
@Override
public void serializeDeweyID(BytesOut> sink, byte[] deweyID, byte[] nextDeweyID,
ResourceConfiguration resourceConfig) {
if (resourceConfig.areDeweyIDsStored) {
if (nextDeweyID != null) {
//assert deweyIDBytes.length <= nextDeweyIDBytes.length;
int i = 0;
for (; i < deweyID.length && i < nextDeweyID.length; i++) {
if (deweyID[i] != nextDeweyID[i]) {
break;
}
}
writeDeweyID(sink, nextDeweyID, i);
} else {
sink.writeByte((byte) deweyID.length);
sink.write(deweyID);
}
}
}
private static void writeDeweyID(final BytesOut> sink, final byte[] deweyID, @NonNegative final int i) {
sink.writeByte((byte) i);
sink.writeByte((byte) (deweyID.length - i));
final var bytes = Arrays.copyOfRange(deweyID, i, deweyID.length);
sink.write(bytes);
}
}
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