b57d9f307f
- write() now accepts a ChannelPromise and returns ChannelFuture as most users expected. It makes the user's life much easier because it is now much easier to get notified when a specific message has been written. - flush() does not create a ChannelPromise nor returns ChannelFuture. It is now similar to what read() looks like.
97 lines
3.0 KiB
Java
97 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 io.netty.example.discard;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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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 SimpleChannelInboundHandler<Object> {
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private static final Logger logger = Logger.getLogger(
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DiscardClientHandler.class.getName());
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private final int messageSize;
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private ByteBuf content;
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private ChannelHandlerContext ctx;
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public DiscardClientHandler(int messageSize) {
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if (messageSize <= 0) {
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throw new IllegalArgumentException(
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"messageSize: " + messageSize);
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}
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this.messageSize = messageSize;
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}
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@Override
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public void channelActive(ChannelHandlerContext ctx)
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throws Exception {
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this.ctx = ctx;
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// Initialize the message.
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content = ctx.alloc().directBuffer(messageSize).writeZero(messageSize);
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// Send the initial messages.
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generateTraffic();
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}
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@Override
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public void channelInactive(ChannelHandlerContext ctx) throws Exception {
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content.release();
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}
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@Override
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public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception {
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// Server is supposed to send nothing, but if it sends something, discard it.
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx,
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Throwable cause) throws Exception {
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// Close the connection when an exception is raised.
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logger.log(
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Level.WARNING,
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"Unexpected exception from downstream.",
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cause);
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ctx.close();
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}
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long counter;
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private void generateTraffic() {
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// Flush the outbound buffer to the socket.
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// Once flushed, generate the same amount of traffic again.
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ctx.writeAndFlush(content.duplicate().retain()).addListener(trafficGenerator);
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}
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private final ChannelFutureListener trafficGenerator = new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture future) throws Exception {
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if (future.isSuccess()) {
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generateTraffic();
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}
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}
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};
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}
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