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.
168 lines
6.1 KiB
Java
168 lines
6.1 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.proxy;
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import org.jboss.netty.bootstrap.ClientBootstrap;
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import org.jboss.netty.buffer.ChannelBuffer;
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import org.jboss.netty.buffer.ChannelBuffers;
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import org.jboss.netty.channel.Channel;
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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.socket.ClientSocketChannelFactory;
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import java.net.InetSocketAddress;
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public class HexDumpProxyInboundHandler extends SimpleChannelUpstreamHandler {
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private final ClientSocketChannelFactory cf;
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// This lock guards against the race condition that overrides the
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// OP_READ flag incorrectly.
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// See the related discussion: http://markmail.org/message/x7jc6mqx6ripynqf
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final Object trafficLock = new Object();
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private volatile Channel outboundChannel;
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public HexDumpProxyInboundHandler(ClientSocketChannelFactory cf) {
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this.cf = cf;
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}
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@Override
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public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) {
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// Suspend incoming traffic until connected to the remote host.
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final Channel inboundChannel = e.getChannel();
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inboundChannel.setReadable(false);
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// Start the connection attempt.
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ClientBootstrap cb = new ClientBootstrap(cf);
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cb.getPipeline().addLast("handler", new OutboundHandler(e.getChannel()));
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ChannelFuture f = cb.connect(new InetSocketAddress(HexDumpProxy.REMOTE_HOST, HexDumpProxy.REMOTE_PORT));
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outboundChannel = f.getChannel();
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f.addListener(new ChannelFutureListener() {
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public void operationComplete(ChannelFuture future) {
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if (future.isSuccess()) {
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// Connection attempt succeeded:
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// Begin to accept incoming traffic.
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inboundChannel.setReadable(true);
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} else {
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// Close the connection if the connection attempt has failed.
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inboundChannel.close();
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}
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}
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});
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}
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@Override
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public void messageReceived(ChannelHandlerContext ctx, final MessageEvent e) {
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ChannelBuffer msg = (ChannelBuffer) e.getMessage();
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//System.err.println(">>> " + ChannelBuffers.hexDump(msg));
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synchronized (trafficLock) {
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outboundChannel.write(msg);
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// If outboundChannel is saturated, do not read until notified in
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// OutboundHandler.channelInterestChanged().
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if (!outboundChannel.isWritable()) {
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e.getChannel().setReadable(false);
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}
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}
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}
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@Override
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public void channelInterestChanged(ChannelHandlerContext ctx, ChannelStateEvent e) {
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// If inboundChannel is not saturated anymore, continue accepting
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// the incoming traffic from the outboundChannel.
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synchronized (trafficLock) {
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if (e.getChannel().isWritable()) {
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if (outboundChannel != null) {
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outboundChannel.setReadable(true);
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}
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}
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}
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}
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@Override
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public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) {
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if (outboundChannel != null) {
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closeOnFlush(outboundChannel);
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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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closeOnFlush(e.getChannel());
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}
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private class OutboundHandler extends SimpleChannelUpstreamHandler {
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private final Channel inboundChannel;
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OutboundHandler(Channel inboundChannel) {
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this.inboundChannel = inboundChannel;
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}
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@Override
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public void messageReceived(ChannelHandlerContext ctx, final MessageEvent e) {
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ChannelBuffer msg = (ChannelBuffer) e.getMessage();
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//System.err.println("<<< " + ChannelBuffers.hexDump(msg));
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synchronized (trafficLock) {
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inboundChannel.write(msg);
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// If inboundChannel is saturated, do not read until notified in
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// HexDumpProxyInboundHandler.channelInterestChanged().
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if (!inboundChannel.isWritable()) {
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e.getChannel().setReadable(false);
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}
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}
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}
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@Override
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public void channelInterestChanged(ChannelHandlerContext ctx, ChannelStateEvent e) {
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// If outboundChannel is not saturated anymore, continue accepting
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// the incoming traffic from the inboundChannel.
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synchronized (trafficLock) {
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if (e.getChannel().isWritable()) {
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inboundChannel.setReadable(true);
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}
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}
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}
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@Override
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public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) {
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closeOnFlush(inboundChannel);
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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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closeOnFlush(e.getChannel());
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}
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}
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/**
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* Closes the specified channel after all queued write requests are flushed.
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*/
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static void closeOnFlush(Channel ch) {
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if (ch.isConnected()) {
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ch.write(ChannelBuffers.EMPTY_BUFFER).addListener(ChannelFutureListener.CLOSE);
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}
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}
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}
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