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.
120 lines
4.3 KiB
Java
120 lines
4.3 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.securechat;
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import org.jboss.netty.channel.Channel;
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import org.jboss.netty.channel.ChannelEvent;
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import org.jboss.netty.channel.ChannelFuture;
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import org.jboss.netty.channel.ChannelFutureListener;
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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.MessageEvent;
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import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
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import org.jboss.netty.channel.group.ChannelGroup;
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import org.jboss.netty.channel.group.DefaultChannelGroup;
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import org.jboss.netty.handler.ssl.SslHandler;
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import java.net.InetAddress;
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/**
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* Handles a server-side channel.
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*/
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public class SecureChatServerHandler extends SimpleChannelUpstreamHandler {
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static final ChannelGroup channels = new DefaultChannelGroup();
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@Override
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public void handleUpstream(ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
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if (e instanceof ChannelStateEvent) {
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System.err.println(e);
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}
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super.handleUpstream(ctx, e);
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}
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@Override
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public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
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// Get the SslHandler in the current pipeline.
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// We added it in SecureChatPipelineFactory.
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final SslHandler sslHandler = ctx.getPipeline().get(SslHandler.class);
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// Get notified when SSL handshake is done.
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ChannelFuture handshakeFuture = sslHandler.handshake();
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handshakeFuture.addListener(new Greeter(sslHandler));
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}
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@Override
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public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
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// Unregister the channel from the global channel list
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// so the channel does not receive messages anymore.
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channels.remove(e.getChannel());
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}
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@Override
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public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
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// Convert to a String first.
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String request = (String) e.getMessage();
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// Send the received message to all channels but the current one.
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for (Channel c: channels) {
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if (c != e.getChannel()) {
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c.write("[" + e.getChannel().getRemoteAddress() + "] " +
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request + '\n');
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} else {
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c.write("[you] " + request + '\n');
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}
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}
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// Close the connection if the client has sent 'bye'.
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if ("bye".equals(request.toLowerCase())) {
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e.getChannel().close();
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
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e.getCause().printStackTrace();
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e.getChannel().close();
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}
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private static final class Greeter implements ChannelFutureListener {
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private final SslHandler sslHandler;
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Greeter(SslHandler sslHandler) {
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this.sslHandler = sslHandler;
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}
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public void operationComplete(ChannelFuture future) throws Exception {
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if (future.isSuccess()) {
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// Once session is secured, send a greeting.
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future.getChannel().write(
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"Welcome to " + InetAddress.getLocalHost().getHostName() + " secure chat service!\n");
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future.getChannel().write(
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"Your session is protected by " + sslHandler.getEngine().getSession().getCipherSuite() +
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" cipher suite.\n");
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// Register the channel to the global channel list
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// so the channel received the messages from others.
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channels.add(future.getChannel());
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} else {
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future.getChannel().close();
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}
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}
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}
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}
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