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package org.fz.nettyx.codec;

import cn.hutool.core.util.TypeUtil;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ByteToMessageCodec;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import lombok.Getter;
import org.fz.nettyx.serializer.struct.StructSerializer;

import java.lang.reflect.Type;
import java.util.List;

/**
 * struct codec
 * @author fengbinbin
 * @version 1.0
 * @since 2024/7/26 18:58
 */

@Getter
public abstract class StructCodec extends ByteToMessageCodec {

    private static final InternalLogger log = InternalLoggerFactory.getInstance(StructCodec.class);

    private static final boolean DEFAULT_SKIP_LEFT_BYTES = true;

    private final Type type = TypeUtil.getTypeArgument(this.getClass());

    private final boolean skipLeftBytes;

    protected StructCodec() {
        this.skipLeftBytes = DEFAULT_SKIP_LEFT_BYTES;
    }

    protected StructCodec(boolean skipLeftBytes) {
        this.skipLeftBytes = skipLeftBytes;
    }

    @Override
    protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List out) {
        try {
            out.add(StructSerializer.toStruct(type, msg));
        } finally {
            // If there is still readable data in the buffer after serialization, it will be skipped if skipLeftBytes is true
            if (skipLeftBytes && msg.readableBytes() > 0) {
                int readableLength = msg.readableBytes();
                log.debug("There is still readable bytes in the buffer after serialization, it will be skipped, length is [{}]", readableLength);
                msg.skipBytes(readableLength);
            }
        }
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, T msg, ByteBuf out) {
        out.writeBytes(StructSerializer.toByteBuf(type, msg));
    }
}    

    

    

            

    

            



    
    






    
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