/*
* Copyright 2009 Red Hat, Inc.
*
* Red Hat 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.jboss.netty.example.uptime;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;
import org.jboss.netty.bootstrap.ClientBootstrap;
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.NioClientSocketChannelFactory;
import org.jboss.netty.handler.timeout.ReadTimeoutHandler;
import org.jboss.netty.util.HashedWheelTimer;
import org.jboss.netty.util.Timer;
/**
* Connects to a server periodically to measure and print the uptime of the
* server. This example demonstrates how to implement reliable reconnection
* mechanism in Netty.
*
* @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
* @author <a href="http://gleamynode.net/">Trustin Lee</a>
*
* @version $Rev: 2080 $, $Date: 2010-01-26 18:04:19 +0900 (Tue, 26 Jan 2010) $
*/
public class UptimeClient {
// Sleep 5 seconds before a reconnection attempt.
static final int RECONNECT_DELAY = 5;
// Reconnect when the server sends nothing for 10 seconds.
private static final int READ_TIMEOUT = 10;
public static void main(String[] args) throws Exception {
// Print usage if no argument is specified.
if (args.length != 2) {
System.err.println(
"Usage: " + UptimeClient.class.getSimpleName() +
" <host> <port>");
return;
}
// Parse options.
String host = args[0];
int port = Integer.parseInt(args[1]);
// Initialize the timer that schedules subsequent reconnection attempts.
final Timer timer = new HashedWheelTimer();
// Configure the client.
final ClientBootstrap bootstrap = new ClientBootstrap(
new NioClientSocketChannelFactory(
Executors.newCachedThreadPool(),
Executors.newCachedThreadPool()));
// Configure the pipeline factory.
bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
public ChannelPipeline getPipeline() throws Exception {
return Channels.pipeline(
new ReadTimeoutHandler(timer, READ_TIMEOUT),
new UptimeClientHandler(bootstrap, timer));
}
});
bootstrap.setOption(
"remoteAddress", new InetSocketAddress(host, port));
// Initiate the first connection attempt - the rest is handled by
// UptimeClientHandler.
bootstrap.connect();
}
}