| /* |
| * 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.reef.wake.remote.transport.netty; |
| |
| import io.netty.buffer.Unpooled; |
| import io.netty.channel.Channel; |
| import io.netty.channel.ChannelFuture; |
| import io.netty.channel.ChannelFutureListener; |
| import org.apache.reef.wake.remote.Encoder; |
| import org.apache.reef.wake.remote.transport.Link; |
| import org.apache.reef.wake.remote.transport.LinkListener; |
| |
| import java.net.SocketAddress; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| |
| /** |
| * Link implementation with Netty. |
| * |
| * If you set a {@code LinkListener<T>}, it keeps message until writeAndFlush operation completes |
| * and notifies whether the sent message transferred successfully through the listener. |
| */ |
| public class NettyLink<T> implements Link<T> { |
| |
| public static final int INT_SIZE = Integer.SIZE / Byte.SIZE; |
| |
| private static final Logger LOG = Logger.getLogger(NettyLink.class.getName()); |
| |
| private final Channel channel; |
| private final Encoder<? super T> encoder; |
| private final LinkListener<? super T> listener; |
| |
| /** |
| * Constructs a link. |
| * |
| * @param channel the channel |
| * @param encoder the encoder |
| */ |
| public NettyLink(final Channel channel, final Encoder<? super T> encoder) { |
| this(channel, encoder, null); |
| } |
| |
| /** |
| * Constructs a link. |
| * |
| * @param channel the channel |
| * @param encoder the encoder |
| * @param listener the link listener |
| */ |
| public NettyLink(final Channel channel, final Encoder<? super T> encoder, final LinkListener<? super T> listener) { |
| this.channel = channel; |
| this.encoder = encoder; |
| this.listener = listener; |
| } |
| |
| /** |
| * Writes the message to this link. |
| * |
| * @param message the message |
| */ |
| @Override |
| public void write(final T message) { |
| LOG.log(Level.FINEST, "write {0} :: {1}", new Object[] {channel, message}); |
| final ChannelFuture future = channel.writeAndFlush(Unpooled.wrappedBuffer(encoder.encode(message))); |
| if (listener != null) { |
| future.addListener(new NettyChannelFutureListener<>(message, listener)); |
| } |
| } |
| |
| /** |
| * Gets a local address of the link. |
| * |
| * @return a local socket address |
| */ |
| @Override |
| public SocketAddress getLocalAddress() { |
| return channel.localAddress(); |
| } |
| |
| /** |
| * Gets a remote address of the link. |
| * |
| * @return a remote socket address |
| */ |
| @Override |
| public SocketAddress getRemoteAddress() { |
| return channel.remoteAddress(); |
| } |
| |
| @Override |
| public String toString() { |
| return "NettyLink: " + channel; // Channel has good .toString() implementation |
| } |
| } |
| |
| class NettyChannelFutureListener<T> implements ChannelFutureListener { |
| |
| private final T message; |
| private LinkListener<T> listener; |
| |
| NettyChannelFutureListener(final T message, final LinkListener<T> listener) { |
| this.message = message; |
| this.listener = listener; |
| } |
| |
| @Override |
| public void operationComplete(final ChannelFuture channelFuture) throws Exception { |
| if (channelFuture.isSuccess()) { |
| listener.onSuccess(message); |
| } else { |
| listener.onException(channelFuture.cause(), channelFuture.channel().remoteAddress(), message); |
| } |
| } |
| } |