/*
* 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.sctp;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.MessageBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandlerAdapter;
import io.netty.channel.sctp.SctpMessage;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Handler implementation for the SCTP echo client. It initiates the ping-pong
* traffic between the echo client and server by sending the first message to
* the server.
*/
public class SctpEchoClientHandler extends ChannelInboundMessageHandlerAdapter<SctpMessage> {
private static final Logger logger = Logger.getLogger(
SctpEchoClientHandler.class.getName());
private final ByteBuf firstMessage;
/**
* Creates a client-side handler.
*/
public SctpEchoClientHandler(int firstMessageSize) {
if (firstMessageSize <= 0) {
throw new IllegalArgumentException("firstMessageSize: " + firstMessageSize);
}
firstMessage = Unpooled.buffer(firstMessageSize);
for (int i = 0; i < firstMessage.capacity(); i++) {
firstMessage.writeByte((byte) i);
}
}
@Override
public void channelActive(ChannelHandlerContext ctx) {
ctx.write(new SctpMessage(0, 0, firstMessage));
}
@Override
public void messageReceived(ChannelHandlerContext ctx, SctpMessage msg) throws Exception {
MessageBuf<Object> out = ctx.nextOutboundMessageBuffer();
out.add(msg);
ctx.flush();
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
// Close the connection when an exception is raised.
logger.log(Level.WARNING, "Unexpected exception from downstream.", cause);
ctx.close();
}
}