/**
* 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.ServerBootstrap;
import org.jboss.netty.channel.ChannelFactory;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
/**
* Simple UDP server implemented using netty.
*/
public class SimpleTcpServer {
public static final Log LOG = LogFactory.getLog(SimpleTcpServer.class);
protected final int port;
protected final ChannelPipelineFactory pipelineFactory;
protected final RpcProgram rpcProgram;
/** The maximum number of I/O worker threads */
protected final int workerCount;
/**
* @param port TCP port where to start the server at
* @param program RPC program corresponding to the server
* @param workercount Number of worker threads
*/
public SimpleTcpServer(int port, RpcProgram program, int workercount) {
this.port = port;
this.rpcProgram = program;
this.workerCount = workercount;
this.pipelineFactory = getPipelineFactory();
}
public ChannelPipelineFactory getPipelineFactory() {
return new ChannelPipelineFactory() {
@Override
public ChannelPipeline getPipeline() {
return Channels.pipeline(new RpcFrameDecoder(),
new SimpleTcpServerHandler(rpcProgram));
}
};
}
public void run() {
// Configure the Server.
ChannelFactory factory;
if (workerCount == 0) {
// Use default workers: 2 * the number of available processors
factory = new NioServerSocketChannelFactory(
Executors.newCachedThreadPool(), Executors.newCachedThreadPool());
} else {
factory = new NioServerSocketChannelFactory(
Executors.newCachedThreadPool(), Executors.newCachedThreadPool(),
workerCount);
}
ServerBootstrap bootstrap = new ServerBootstrap(factory);
bootstrap.setPipelineFactory(pipelineFactory);
bootstrap.setOption("child.tcpNoDelay", true);
bootstrap.setOption("child.keepAlive", true);
// Listen to TCP port
bootstrap.bind(new InetSocketAddress(port));
LOG.info("Started listening to TCP requests at port " + port + " for "
+ rpcProgram + " with workerCount " + workerCount);
}
}