Java tutorial
/* * Copyright 2012 The Netty Project * * The Netty Project licenses this file to you under the Apache License, * version 2.0 (the "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. */ package com.chen.opensourceframework.netty.discard; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelFutureListener; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; /** * Handles a client-side channel. */ public class DiscardClientHandler extends SimpleChannelInboundHandler<Object> { private ByteBuf content; private ChannelHandlerContext ctx; @Override public void channelActive(ChannelHandlerContext ctx) { this.ctx = ctx; content = Unpooled.buffer(DiscardClient.SIZE); String src = "Hello World"; content.writeBytes(src.getBytes()); ctx.writeAndFlush(content); // Send the initial messages. // generateTraffic(); } @Override public void channelInactive(ChannelHandlerContext ctx) { content.release(); } @Override public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception { // Server is supposed to send nothing, but if it sends something, discard it. } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { // Close the connection when an exception is raised. cause.printStackTrace(); ctx.close(); } long counter; private void generateTraffic() { // Flush the outbound buffer to the socket. // Once flushed, generate the same amount of traffic again. ctx.writeAndFlush(content.retainedDuplicate()).addListener(trafficGenerator); } private final ChannelFutureListener trafficGenerator = new ChannelFutureListener() { @Override public void operationComplete(ChannelFuture future) { if (future.isSuccess()) { generateTraffic(); } else { future.cause().printStackTrace(); future.channel().close(); } } }; }