io.netty.example.objectecho.ObjectEchoClientHandler Maven / Gradle / Ivy
/*
* 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.objectecho;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandlerAdapter;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Handler implementation for the object echo client. It initiates the
* ping-pong traffic between the object echo client and server by sending the
* first message to the server.
*/
public class ObjectEchoClientHandler extends ChannelInboundMessageHandlerAdapter> {
private static final Logger logger = Logger.getLogger(
ObjectEchoClientHandler.class.getName());
private final List firstMessage;
/**
* Creates a client-side handler.
*/
public ObjectEchoClientHandler(int firstMessageSize) {
if (firstMessageSize <= 0) {
throw new IllegalArgumentException(
"firstMessageSize: " + firstMessageSize);
}
firstMessage = new ArrayList(firstMessageSize);
for (int i = 0; i < firstMessageSize; i ++) {
firstMessage.add(Integer.valueOf(i));
}
}
@Override
public void channelActive(ChannelHandlerContext ctx) throws Exception {
// Send the first message if this handler is a client-side handler.
ctx.write(firstMessage);
}
@Override
public void messageReceived(ChannelHandlerContext ctx, List msg) throws Exception {
// Echo back the received object to the server.
ctx.write(msg);
}
@Override
public void exceptionCaught(
ChannelHandlerContext ctx, Throwable cause) throws Exception {
logger.log(
Level.WARNING,
"Unexpected exception from downstream.", cause);
ctx.close();
}
}