Source code

001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.reef.wake.remote.impl;
020
021import org.apache.reef.wake.remote.Codec;
022import org.apache.reef.wake.remote.Decoder;
023import org.apache.reef.wake.remote.Encoder;
024
025import java.util.HashMap;
026import java.util.Map;
027
028/**
029 * Codec using the WakeTuple protocol buffer
030 * (class name and bytes)
031 *
032 * @param <T>
033 */
034public class MultiCodec<T> implements Codec<T> {
035
036  private final Encoder<T> encoder;
037  private final Decoder<T> decoder;
038
039  /**
040   * Constructs a codec that encodes/decodes an object to/from bytes based on the class name
041   *
042   * @param clazzToDecoderMap
043   */
044  public MultiCodec(Map<Class<? extends T>, Codec<? extends T>> clazzToCodecMap) {
045    Map<Class<? extends T>, Encoder<? extends T>> clazzToEncoderMap = new HashMap<Class<? extends T>, Encoder<? extends T>>();
046    Map<Class<? extends T>, Decoder<? extends T>> clazzToDecoderMap = new HashMap<Class<? extends T>, Decoder<? extends T>>();
047    for (Class<? extends T> clazz : clazzToCodecMap.keySet()) {
048      clazzToEncoderMap.put(clazz, clazzToCodecMap.get(clazz));
049      clazzToDecoderMap.put(clazz, clazzToCodecMap.get(clazz));
050    }
051    encoder = new MultiEncoder<T>(clazzToEncoderMap);
052    decoder = new MultiDecoder<T>(clazzToDecoderMap);
053  }
054
055  /**
056   * Encodes an object to a byte array
057   *
058   * @param obj
059   */
060  @Override
061  public byte[] encode(T obj) {
062    return encoder.encode(obj);
063  }
064
065  /**
066   * Decodes byte array
067   *
068   * @param data class name and byte payload
069   */
070  @Override
071  public T decode(byte[] data) {
072    return decoder.decode(data);
073  }
074
075}