its-library/its-cluster/src/main/java/com/its/common/cluster/codec/ClusterMessageEncoder.java

package com.its.common.cluster.codec;

import com.its.common.cluster.vo.ClusterMessage;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;
import lombok.extern.slf4j.Slf4j;

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;

@Slf4j
public class ClusterMessageEncoder extends MessageToByteEncoder<ClusterMessage> {

    private final boolean isLogging;

    public ClusterMessageEncoder(boolean isLogging) {
        this.isLogging = isLogging;
    }

    @Override
    protected void encode(ChannelHandlerContext ctx, ClusterMessage msg, ByteBuf out) throws Exception {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(msg);
        oos.flush();

        byte[] bytes = bos.toByteArray();

        if (this.isLogging) {
            log.info("ClusterMessageEncoder.encode: SEND {} Bytes.", bytes.length + 4);
        }

        out.writeInt(bytes.length); // 길이 필드 추가
        out.writeBytes(bytes);

        oos.close();
        bos.close();
    }
}