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.
106 lines
3.5 KiB
Java
106 lines
3.5 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.discard;
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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.ChannelEvent;
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import org.jboss.netty.channel.ChannelHandlerContext;
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import org.jboss.netty.channel.ChannelState;
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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.WriteCompletionEvent;
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/**
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* Handles a client-side channel.
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*/
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public class DiscardClientHandler extends SimpleChannelUpstreamHandler {
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private long transferredBytes;
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private final byte[] content;
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public DiscardClientHandler() {
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content = new byte[DiscardClient.SIZE];
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}
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public long getTransferredBytes() {
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return transferredBytes;
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}
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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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if (((ChannelStateEvent) e).getState() != ChannelState.INTEREST_OPS) {
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System.err.println(e);
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}
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}
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// Let SimpleChannelHandler call actual event handler methods below.
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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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// Send the initial messages.
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generateTraffic(e);
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}
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@Override
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public void channelInterestChanged(ChannelHandlerContext ctx, ChannelStateEvent e) {
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// Keep sending messages whenever the current socket buffer has room.
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generateTraffic(e);
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}
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@Override
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public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
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// Server is supposed to send nothing. Therefore, do nothing.
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}
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@Override
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public void writeComplete(ChannelHandlerContext ctx, WriteCompletionEvent e) {
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transferredBytes += e.getWrittenAmount();
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
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// Close the connection when an exception is raised.
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e.getCause().printStackTrace();
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e.getChannel().close();
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}
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private void generateTraffic(ChannelStateEvent e) {
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// Keep generating traffic until the channel is unwritable.
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// A channel becomes unwritable when its internal buffer is full.
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// If you keep writing messages ignoring this property,
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// you will end up with an OutOfMemoryError.
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Channel channel = e.getChannel();
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while (channel.isWritable()) {
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ChannelBuffer m = nextMessage();
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if (m == null) {
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break;
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}
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channel.write(m);
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}
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}
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private ChannelBuffer nextMessage() {
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return ChannelBuffers.wrappedBuffer(content);
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}
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}
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