/*
* 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 io.netty.example.discard;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundByteHandlerAdapter;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Handles a client-side channel.
*/
public class DiscardClientHandler extends ChannelInboundByteHandlerAdapter {
private static final Logger logger = Logger.getLogger(
DiscardClientHandler.class.getName());
private final int messageSize;
private ByteBuf content;
private ChannelHandlerContext ctx;
public DiscardClientHandler(int messageSize) {
if (messageSize <= 0) {
throw new IllegalArgumentException(
"messageSize: " + messageSize);
}
this.messageSize = messageSize;
}
@Override
public void channelActive(ChannelHandlerContext ctx)
throws Exception {
this.ctx = ctx;
// Initialize the message.
content = ctx.alloc().directBuffer(messageSize).writeZero(messageSize);
// Send the initial messages.
generateTraffic();
}
@Override
public void inboundBufferUpdated(ChannelHandlerContext ctx, ByteBuf in)
throws Exception {
// Server is supposed to send nothing, but if it sends something, discard it.
in.clear();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx,
Throwable cause) throws Exception {
// Close the connection when an exception is raised.
logger.log(
Level.WARNING,
"Unexpected exception from downstream.",
cause);
ctx.close();
}
long counter;
private void generateTraffic() {
// Fill the outbound buffer up to 64KiB
ByteBuf out = ctx.nextOutboundByteBuffer();
while (out.readableBytes() < 65536) {
out.writeBytes(content, 0, content.readableBytes());
}
// Flush the outbound buffer to the socket.
// Once flushed, generate the same amount of traffic again.
ctx.flush().addListener(trafficGenerator);
}
private final ChannelFutureListener trafficGenerator = new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
generateTraffic();
}
}
};
}