KryoValuesSerializer.java

package backtype.storm.serialization;

import backtype.storm.utils.ListDelegate;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.Output;
import java.io.IOException;
import java.util.List;
import java.util.Map;

public class KryoValuesSerializer {
	Kryo _kryo;
	ListDelegate _delegate;
	Output _kryoOut;

	public KryoValuesSerializer(Map conf) {
		_kryo = SerializationFactory.getKryo(conf);
		_delegate = new ListDelegate();
		_kryoOut = new Output(2000, 2000000000);
	}

	public void serializeInto(List<Object> values, Output out)
			throws IOException {
		// this ensures that list of values is always written the same way,
		// regardless
		// of whether it's a java collection or one of clojure's persistent
		// collections
		// (which have different serializers)
		// Doing this lets us deserialize as ArrayList and avoid writing the
		// class here
		_delegate.setDelegate(values);
		_kryo.writeObject(out, _delegate);
	}

	public byte[] serialize(List<Object> values) throws IOException {
		_kryoOut.clear();
		serializeInto(values, _kryoOut);
		return _kryoOut.toBytes();
	}

	public byte[] serializeObject(Object obj) {
		_kryoOut.clear();
		_kryo.writeClassAndObject(_kryoOut, obj);
		return _kryoOut.toBytes();
	}
}