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    • cn.t.tool.nettytool.decoder.NettyB2mDecoder Maven / Gradle / Ivy

    package cn.t.tool.nettytool.decoder;

import cn.t.tool.nettytool.analyser.ByteBufAnalyser;
import cn.t.tool.nettytool.util.NullMessage;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;

public class NettyB2mDecoder extends ByteToMessageDecoder {

    private static final Logger logger = LoggerFactory.getLogger(NettyB2mDecoder.class);

    private ByteBufAnalyser byteBufAnalyser;

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List out) {
        if(in.isReadable()) {
            int readerIndex = in.readerIndex();
            Object msg = byteBufAnalyser.analyse(in, ctx);
            if(msg == null) {
                logger.info("[{}]: message is incomplete, reader index reset", ctx.channel().remoteAddress());
                in.readerIndex(readerIndex);
            } else {
                if(NullMessage.getNullMessage() != msg) {
                    logger.info("[{}]: decode success, type: {}", ctx.channel().remoteAddress(), msg.getClass().getSimpleName());
                    out.add(msg);
                } else {
                    logger.info("[{}]： read a null message，reader index will not reset", ctx.channel().remoteAddress());
                }
            }
        }
    }

    public NettyB2mDecoder(ByteBufAnalyser byteBufAnalyser) {
        this.byteBufAnalyser = byteBufAnalyser;
    }

    public void setByteBufAnalyser(ByteBufAnalyser byteBufAnalyser) {
        this.byteBufAnalyser = byteBufAnalyser;
    }
}
    
    
    
    

    




    
    
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