package com.snowcattle.game.common.socket.server;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
/**
* Created by jiangwenping on 17/1/24.
* 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 ProtoServerChannelInitializer extends ChannelInitializer<NioSocketChannel> {
@Override
protected void initChannel(NioSocketChannel nioSocketChannel) throws Exception {
ChannelPipeline channelPipLine = nioSocketChannel.pipeline();
short maxLength = Short.MAX_VALUE;
nioSocketChannel.pipeline().addLast(new LengthFieldBasedFrameDecoder(maxLength, 0, 4, 0, 0));
nioSocketChannel.pipeline().addLast(new ProtoStringDecoder());
// channelPipLine.addLast(new LineBasedFrameDecoder(1024));
// channelPipLine.addLast(new StringDecoder());
// channelPipLine.addLast(new StringEncoder());
channelPipLine.addLast(new ProtoSocketServerHandler());
}
}