LengthBasedInitializer.java

package com.manning.nettyinaction.chapter8;

import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.LengthFieldBasedFrameDecoder;

/**
 * @author <a href="mailto:norman.maurer@googlemail.com">Norman Maurer</a>
 */
public class LengthBasedInitializer extends ChannelInitializer<Channel> {

    @Override
    protected void initChannel(Channel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        pipeline.addLast(new LengthFieldBasedFrameDecoder(65 * 1024, 0, 8));
        pipeline.addLast(new FrameHandler());
    }

    public static final class FrameHandler extends SimpleChannelInboundHandler<ByteBuf> {
        @Override
        public void channelRead0(ChannelHandlerContext ctx, ByteBuf msg) throws Exception {
            // Do something with the frame
        }
    }
}