| /** |
| * 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.hadoop.oncrpc; |
| |
| import java.net.InetSocketAddress; |
| import java.util.concurrent.Executors; |
| |
| import org.jboss.netty.bootstrap.ConnectionlessBootstrap; |
| import org.jboss.netty.channel.Channel; |
| import org.jboss.netty.channel.Channels; |
| import org.jboss.netty.channel.SimpleChannelUpstreamHandler; |
| import org.jboss.netty.channel.socket.DatagramChannelFactory; |
| import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Simple UDP server implemented based on netty. |
| */ |
| public class SimpleUdpServer { |
| public static final Logger LOG = |
| LoggerFactory.getLogger(SimpleUdpServer.class); |
| private final int SEND_BUFFER_SIZE = 65536; |
| private final int RECEIVE_BUFFER_SIZE = 65536; |
| |
| protected final int port; |
| protected final SimpleChannelUpstreamHandler rpcProgram; |
| protected final int workerCount; |
| protected int boundPort = -1; // Will be set after server starts |
| private ConnectionlessBootstrap server; |
| private Channel ch; |
| |
| public SimpleUdpServer(int port, SimpleChannelUpstreamHandler program, |
| int workerCount) { |
| this.port = port; |
| this.rpcProgram = program; |
| this.workerCount = workerCount; |
| } |
| |
| public void run() { |
| // Configure the client. |
| DatagramChannelFactory f = new NioDatagramChannelFactory( |
| Executors.newCachedThreadPool(), workerCount); |
| |
| server = new ConnectionlessBootstrap(f); |
| server.setPipeline(Channels.pipeline(RpcUtil.STAGE_RPC_MESSAGE_PARSER, |
| rpcProgram, RpcUtil.STAGE_RPC_UDP_RESPONSE)); |
| |
| server.setOption("broadcast", "false"); |
| server.setOption("sendBufferSize", SEND_BUFFER_SIZE); |
| server.setOption("receiveBufferSize", RECEIVE_BUFFER_SIZE); |
| server.setOption("reuseAddress", true); |
| |
| // Listen to the UDP port |
| ch = server.bind(new InetSocketAddress(port)); |
| InetSocketAddress socketAddr = (InetSocketAddress) ch.getLocalAddress(); |
| boundPort = socketAddr.getPort(); |
| |
| LOG.info("Started listening to UDP requests at port " + boundPort + " for " |
| + rpcProgram + " with workerCount " + workerCount); |
| } |
| |
| // boundPort will be set only after server starts |
| public int getBoundPort() { |
| return this.boundPort; |
| } |
| |
| public void shutdown() { |
| if (ch != null) { |
| ch.close().awaitUninterruptibly(); |
| } |
| if (server != null) { |
| server.releaseExternalResources(); |
| } |
| } |
| } |