subprojects/s4-comm/src/main/java/org/apache/s4/comm/topology/ZNRecordSerializer.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.s4.comm.topology;

import org.I0Itec.zkclient.exception.ZkMarshallingError;
import org.I0Itec.zkclient.serialize.ZkSerializer;

import com.google.common.base.Preconditions;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

/**
 * 
 * Utility to serialize/deserialize data in ZK. <br/>
 * Using Json format and Gson library. TODO: Explore other libraries like jackson much richer features. Gson needs
 * no-arg constructor to work with without additional work
 */
public class ZNRecordSerializer implements ZkSerializer {

    @Override
    public byte[] serialize(Object data) throws ZkMarshallingError {
        if (data != null) {
            Gson gson = new GsonBuilder().setPrettyPrinting().create();
            String json = gson.toJson(data);
            if (json != null) {
                return json.getBytes();
            }
        }
        return new byte[0];
    }

    @Override
    public Object deserialize(byte[] bytes) throws ZkMarshallingError {
        ZNRecord record = null;
        if (bytes != null) {
            Gson gson = new Gson();
            record = gson.fromJson(new String(bytes), ZNRecord.class);
        }
        return record;
    }

}