/*
* Copyright 2011 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 org.jboss.netty.example.echo;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
/**
* Handler implementation for the echo client. It initiates the ping-pong
* traffic between the echo client and server by sending the first message to
* the server.
*/
public class EchoClientHandler extends SimpleChannelUpstreamHandler {
private static final Logger logger = Logger.getLogger(
EchoClientHandler.class.getName());
private final ChannelBuffer firstMessage;
private final AtomicLong transferredBytes = new AtomicLong();
/**
* Creates a client-side handler.
*/
public EchoClientHandler(int firstMessageSize) {
if (firstMessageSize <= 0) {
throw new IllegalArgumentException(
"firstMessageSize: " + firstMessageSize);
}
firstMessage = ChannelBuffers.buffer(firstMessageSize);
for (int i = 0; i < firstMessage.capacity(); i ++) {
firstMessage.writeByte((byte) i);
}
}
public long getTransferredBytes() {
return transferredBytes.get();
}
@Override
public void channelConnected(
ChannelHandlerContext ctx, ChannelStateEvent e) {
// Send the first message. Server will not send anything here
// because the firstMessage's capacity is 0.
e.getChannel().write(firstMessage);
}
@Override
public void messageReceived(
ChannelHandlerContext ctx, MessageEvent e) {
// Send back the received message to the remote peer.
transferredBytes.addAndGet(((ChannelBuffer) e.getMessage()).readableBytes());
e.getChannel().write(e.getMessage());
}
@Override
public void exceptionCaught(
ChannelHandlerContext ctx, ExceptionEvent e) {
// Close the connection when an exception is raised.
logger.log(
Level.WARNING,
"Unexpected exception from downstream.",
e.getCause());
e.getChannel().close();
}
}