/**
* 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.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jboss.netty.bootstrap.ConnectionlessBootstrap;
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;
/**
* Simple UDP server implemented based on netty.
*/
public class SimpleUdpServer {
public static final Log LOG = LogFactory.getLog(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;
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);
ConnectionlessBootstrap b = new ConnectionlessBootstrap(f);
b.setPipeline(Channels.pipeline(
RpcUtil.STAGE_RPC_MESSAGE_PARSER, rpcProgram,
RpcUtil.STAGE_RPC_UDP_RESPONSE));
b.setOption("broadcast", "false");
b.setOption("sendBufferSize", SEND_BUFFER_SIZE);
b.setOption("receiveBufferSize", RECEIVE_BUFFER_SIZE);
// Listen to the UDP port
b.bind(new InetSocketAddress(port));
LOG.info("Started listening to UDP requests at port " + port + " for "
+ rpcProgram + " with workerCount " + workerCount);
}
}