GameNetProtoMessageTcpServerChannleInitializer.java

package com.snowcattle.game.service.net;

/**
 * Created by jiangwenping on 17/2/7.
 */

import com.snowcattle.game.common.constant.GlobalConstants;
import com.snowcattle.game.service.net.message.encoder.NetProtoBufMessageTCPEncoder;
import com.snowcattle.game.service.net.message.decoder.NetProtoBufMessageTCPDecoder;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.IdleStateHandler;

/**
 * Created by jwp on 2017/1/26.
 *  * LengthFieldBasedFrameDecoder 使用
 *  head+messagelength+serial+body
 *
 *  参数maxFrameLength 为数据帧最大长度
 *  参数lengthFieldOffset为version长度表示 从第几个字段开始读取长度，表示同意为head的长度
 *  参数lengthFieldLength表示占用了多少个字节数 具体可查看LengthFieldBasedFrameDecoder的getUnadjustedFrameLength方法
 *  参数lengthAdjustment表示还需要拓展长度，具体表示为serial的长度
 *  参数initialBytesToStrip表示 传递给下个coder的时候跳过多少字节 如果从0开始为 head+messagelength+serial+body全部给下个coder
 */
public class GameNetProtoMessageTcpServerChannleInitializer extends ChannelInitializer<NioSocketChannel> {
    @Override
    protected void initChannel(NioSocketChannel nioSocketChannel) throws Exception {

        ChannelPipeline channelPipLine = nioSocketChannel.pipeline();
        int maxLength = Integer.MAX_VALUE;
        channelPipLine.addLast("frame", new LengthFieldBasedFrameDecoder(maxLength, 2, 4, 0, 0));
        channelPipLine.addLast("encoder", new NetProtoBufMessageTCPEncoder());
        channelPipLine.addLast("decoder", new NetProtoBufMessageTCPDecoder());
//        int readerIdleTimeSeconds = GlobalConstants.Net.SESSION_HEART_READ_TIMEOUT;
//        int writerIdleTimeSeconds = GlobalConstants.Net.SESSION_HEART_WRITE_TIMEOUT;
        int readerIdleTimeSeconds = GlobalConstants.Net.SESSION_HEART_ALL_TIMEOUT;
        int writerIdleTimeSeconds = GlobalConstants.Net.SESSION_HEART_ALL_TIMEOUT;
        int allIdleTimeSeconds = GlobalConstants.Net.SESSION_HEART_ALL_TIMEOUT;
        channelPipLine.addLast("idleStateHandler", new IdleStateHandler(readerIdleTimeSeconds, writerIdleTimeSeconds, allIdleTimeSeconds));
        channelPipLine.addLast("logger", new LoggingHandler(LogLevel.DEBUG));
        channelPipLine.addLast("handler", new GameNetMessageTcpServerHandler());
    }
}