ba28679775
Motivation:
The examples have not been updated since long time ago, showing various
issues fixed in this commit.
Modifications:
- Overall simplification to reduce LoC
- Use system properties to get options instead of parsing args.
- Minimize option validation
- Just use System.out/err instead of Logger
- Do not pass config as parameters - just access it directly
- Move the main logic to main(String[]) instead of creating a new
instance meaninglessly
- Update netty-build-21 to make checkstyle not complain
- Remove 'throws Exception' clause if possible
- Line wrap at 120 (previously at 80)
- Add an option to enable SSL for most examples
- Use ChannelFuture.sync() instead of await()
- Use System.out for the actual result. Use System.err otherwise.
- Delete examples that are not very useful:
- websocket/html5
- websocketx/sslserver
- localecho/multithreaded
- Add run-example.sh which simplifies launching an example from command
line
Result:
Shorter and simpler examples. A user can focus more on what it actually
does than miscellaneous stuff. A user can launch an example very
easily.
74 lines
3.0 KiB
Java
74 lines
3.0 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package org.jboss.netty.example.uptime;
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import org.jboss.netty.bootstrap.ClientBootstrap;
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import org.jboss.netty.channel.ChannelHandler;
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import org.jboss.netty.channel.ChannelPipeline;
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import org.jboss.netty.channel.ChannelPipelineFactory;
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import org.jboss.netty.channel.Channels;
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import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
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import org.jboss.netty.handler.timeout.ReadTimeoutHandler;
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import org.jboss.netty.util.HashedWheelTimer;
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import org.jboss.netty.util.Timer;
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import java.net.InetSocketAddress;
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import java.util.concurrent.Executors;
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/**
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* Connects to a server periodically to measure and print the uptime of the
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* server. This example demonstrates how to implement reliable reconnection
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* mechanism in Netty.
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*/
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public final class UptimeClient {
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static final String HOST = System.getProperty("host", "127.0.0.1");
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static final int PORT = Integer.parseInt(System.getProperty("port", "8080"));
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// Sleep 5 seconds before a reconnection attempt.
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static final int RECONNECT_DELAY = Integer.parseInt(System.getProperty("reconnectDelay", "5"));
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// Reconnect when the server sends nothing for 10 seconds.
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static final int READ_TIMEOUT = Integer.parseInt(System.getProperty("readTimeout", "10"));
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public static void main(String[] args) throws Exception {
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// Initialize the timer that schedules subsequent reconnection attempts.
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final Timer timer = new HashedWheelTimer();
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// Configure the client.
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final ClientBootstrap bootstrap = new ClientBootstrap(
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new NioClientSocketChannelFactory(
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Executors.newCachedThreadPool(),
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Executors.newCachedThreadPool()));
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// Configure the pipeline factory.
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bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
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private final ChannelHandler timeoutHandler = new ReadTimeoutHandler(timer, READ_TIMEOUT);
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private final ChannelHandler uptimeHandler = new UptimeClientHandler(bootstrap, timer);
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public ChannelPipeline getPipeline() {
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return Channels.pipeline(timeoutHandler, uptimeHandler);
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}
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});
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bootstrap.setOption("remoteAddress", new InetSocketAddress(HOST, PORT));
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// Initiate the first connection attempt - the rest is handled by
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// UptimeClientHandler.
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bootstrap.connect();
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}
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}
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