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.transport.netty;
020
021import io.netty.buffer.Unpooled;
022import io.netty.channel.Channel;
023import org.apache.reef.wake.remote.Encoder;
024import org.apache.reef.wake.remote.transport.Link;
025import org.apache.reef.wake.remote.transport.LinkListener;
026
027import java.io.IOException;
028import java.net.SocketAddress;
029import java.util.logging.Level;
030import java.util.logging.Logger;
031
032/**
033 * Link implementation with Netty
034 */
035public class NettyLink<T> implements Link<T> {
036
037  public static final int INT_SIZE = Integer.SIZE / Byte.SIZE;
038  private static final Logger LOG = Logger.getLogger(NettyLink.class.getName());
039  private final Channel channel;
040  private final Encoder<? super T> encoder;
041  private final LinkListener<? super T> listener;
042
043  /**
044   * Constructs a link
045   *
046   * @param channel the channel
047   * @param encoder the encoder
048   */
049  public NettyLink(final Channel channel, final Encoder<? super T> encoder) {
050    this(channel, encoder, null);
051  }
052
053  /**
054   * Constructs a link
055   *
056   * @param channel  the channel
057   * @param encoder  the encoder
058   * @param listener the link listener
059   */
060  public NettyLink(final Channel channel,
061                   final Encoder<? super T> encoder, final LinkListener<? super T> listener) {
062    this.channel = channel;
063    this.encoder = encoder;
064    this.listener = listener;
065  }
066
067
068  /**
069   * Writes the message to this link
070   *
071   * @param message the message
072   */
073  @Override
074  public void write(final T message) throws IOException {
075    LOG.log(Level.FINEST, "write {0} {1}", new Object[]{channel, message});
076    byte[] allData = encoder.encode(message);
077    // byte[] -> ByteBuf
078    channel.writeAndFlush(Unpooled.wrappedBuffer(allData));
079  }
080
081  /**
082   * Handles the message received
083   *
084   * @param message the message
085   */
086  @Override
087  public void messageReceived(final T message) {
088    if (listener != null) {
089      listener.messageReceived(message);
090    }
091  }
092
093  /**
094   * Gets a local address of the link
095   *
096   * @return a local socket address
097   */
098  @Override
099  public SocketAddress getLocalAddress() {
100    return channel.localAddress();
101  }
102
103  /**
104   * Gets a remote address of the link
105   *
106   * @return a remote socket address
107   */
108  @Override
109  public SocketAddress getRemoteAddress() {
110    return channel.remoteAddress();
111  }
112
113  @Override
114  public String toString() {
115    return "localAddr: " + getLocalAddress() + " remoteAddr: " + getRemoteAddress();
116  }
117}