storm-client/src/jvm/org/apache/storm/serialization/KryoValuesSerializer.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The ASF licenses this file to you under the Apache License, Version
 * 2.0 (the "License"); you may not use this file except in compliance with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions
 * and limitations under the License.
 */

package org.apache.storm.serialization;

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

public class KryoValuesSerializer {
    Kryo kryo;
    ListDelegate delegate;
    Output kryoOut;

    public KryoValuesSerializer(Map<String, Object> conf) {
        kryo = SerializationFactory.getKryo(conf);
        delegate = new ListDelegate();
        kryoOut = new Output(2000, 2000000000);
    }

    public void serializeInto(List<Object> values, Output out) {
        // 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) {
        kryoOut.clear();
        serializeInto(values, kryoOut);
        return kryoOut.toBytes();
    }

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