Java tutorial
/* * Copyright 2013-2018 Lilinfeng. * * Licensed 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.lampard.netty4.protocol.netty.server; import com.lampard.netty4.protocol.netty.MessageType; import com.lampard.netty4.protocol.netty.struct.Header; import io.netty.channel.ChannelHandlerAdapter; import io.netty.channel.ChannelHandlerContext; import com.lampard.netty4.protocol.netty.struct.NettyMessage; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * @author Lilinfeng * @date 2014315 * @version 1.0 */ public class HeartBeatRespHandler extends ChannelHandlerAdapter { private static final Log LOG = LogFactory.getLog(HeartBeatRespHandler.class); @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { NettyMessage message = (NettyMessage) msg; // ? if (message.getHeader() != null && message.getHeader().getType() == MessageType.HEARTBEAT_REQ.value()) { LOG.info("Receive client heart beat message : ---> " + message); NettyMessage heartBeat = buildHeatBeat(); LOG.info("Send heart beat response message to client : ---> " + heartBeat); ctx.writeAndFlush(heartBeat); } else ctx.fireChannelRead(msg); } private NettyMessage buildHeatBeat() { NettyMessage message = new NettyMessage(); Header header = new Header(); header.setType(MessageType.HEARTBEAT_RESP.value()); message.setHeader(header); return message; } }