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.
100 lines
3.4 KiB
Java
100 lines
3.4 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.ChannelHandlerContext;
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import org.jboss.netty.channel.ChannelStateEvent;
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import org.jboss.netty.channel.ExceptionEvent;
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import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
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import org.jboss.netty.handler.timeout.ReadTimeoutException;
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import org.jboss.netty.util.Timeout;
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import org.jboss.netty.util.Timer;
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import org.jboss.netty.util.TimerTask;
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import java.net.ConnectException;
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import java.net.InetSocketAddress;
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import java.util.concurrent.TimeUnit;
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/**
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* Keep reconnecting to the server while printing out the current uptime and
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* connection attempt status.
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*/
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public class UptimeClientHandler extends SimpleChannelUpstreamHandler {
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final ClientBootstrap bootstrap;
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private final Timer timer;
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private long startTime = -1;
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public UptimeClientHandler(ClientBootstrap bootstrap, Timer timer) {
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this.bootstrap = bootstrap;
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this.timer = timer;
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}
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InetSocketAddress getRemoteAddress() {
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return (InetSocketAddress) bootstrap.getOption("remoteAddress");
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}
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@Override
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public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
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println("Disconnected from: " + getRemoteAddress());
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}
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@Override
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public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) {
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println("Sleeping for: " + UptimeClient.RECONNECT_DELAY + 's');
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timer.newTimeout(new TimerTask() {
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public void run(Timeout timeout) {
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println("Reconnecting to: " + getRemoteAddress());
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bootstrap.connect();
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}
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}, UptimeClient.RECONNECT_DELAY, TimeUnit.SECONDS);
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}
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@Override
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public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
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if (startTime < 0) {
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startTime = System.currentTimeMillis();
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}
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println("Connected to: " + getRemoteAddress());
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
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Throwable cause = e.getCause();
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if (cause instanceof ConnectException) {
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startTime = -1;
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println("Failed to connect: " + cause.getMessage());
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}
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if (cause instanceof ReadTimeoutException) {
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// The connection was OK but there was no traffic for last period.
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println("Disconnecting due to no inbound traffic");
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} else {
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cause.printStackTrace();
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}
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ctx.getChannel().close();
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}
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private void println(String msg) {
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if (startTime < 0) {
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System.err.format("[SERVER IS DOWN] %s%n", msg);
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} else {
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System.err.format("[UPTIME: %5ds] %s%n", (System.currentTimeMillis() - startTime) / 1000, msg);
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}
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}
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}
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