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 com.google.protobuf.InvalidProtocolBufferException;
022import org.apache.reef.wake.remote.Decoder;
023import org.apache.reef.wake.remote.exception.RemoteRuntimeException;
024import org.apache.reef.wake.remote.proto.WakeRemoteProtos.WakeMessagePBuf;
025
026/**
027 * Remote event decoder using the WakeMessage protocol buffer.
028 *
029 * @param <T> type
030 */
031public class RemoteEventDecoder<T> implements Decoder<RemoteEvent<T>> {
032
033  private final Decoder<T> decoder;
034
035  /**
036   * Constructs a remote event decoder.
037   *
038   * @param decoder the decoder of the event
039   */
040  public RemoteEventDecoder(final Decoder<T> decoder) {
041    this.decoder = decoder;
042  }
043
044  /**
045   * Decodes a remote event from the byte array data.
046   *
047   * @param data the byte array data
048   * @return a remote event object
049   * @throws RemoteRuntimeException
050   */
051  @Override
052  public RemoteEvent<T> decode(final byte[] data) {
053    final WakeMessagePBuf pbuf;
054    try {
055      pbuf = WakeMessagePBuf.parseFrom(data);
056      return new RemoteEvent<T>(null, null, pbuf.getSeq(), decoder.decode(pbuf.getData().toByteArray()));
057    } catch (final InvalidProtocolBufferException e) {
058      throw new RemoteRuntimeException(e);
059    }
060  }
061
062}