com.github.javaclub.mq.common.netty.protocol.AckSubMsgProtocol Maven / Gradle / Ivy

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package com.github.javaclub.mq.common.netty.protocol;

import io.netty.buffer.ByteBuf;

/**
 * 	customer向broker发送消息ack
 */
public class AckSubMsgProtocol extends AbstractProtocol{
	private static byte code = CodeProtocol.ack_sub_msg;  
	private byte ack;    // 1: 成功， 0 ： 失败
	private int subId;  // 订阅者
	private byte msgIdLength;  // msgid长度（byte）
	private byte[] msgid;
	
	public void encode(ByteBuf out) {
		super.setCode(code);
		super.encode(out);
		out.writeByte(ack);
		out.writeInt(subId);
		out.writeByte(msgIdLength);
		out.writeBytes(msgid);
	}

	public int decode(ByteBuf in){
		int readindex = super.decode(in);
		if(readindex != -1){  
			if(in.readableBytes() >= 1 + 4 + 1){
				readindex = in.readerIndex();
				ack = in.readByte();
				subId = in.readInt();
				msgIdLength = in.readByte();
				if(in.readableBytes() >= msgIdLength){
					msgid = new byte[msgIdLength];
					in.readBytes(msgid);
					return 0;
				}else{
					in.readerIndex(readindex); // 恢复readindex
					return -1;
				}
			}else{
				in.readerIndex(readindex); // 恢复readindex
				return -1;
			}
		}
		return -1;
	}
	public byte getCode() {
		return code;
	}

	public void setCode(byte code) {
		AckSubMsgProtocol.code = code;
	}

	public byte getMsgIdLength() {
		return msgIdLength;
	}

	public void setMsgIdLength(byte msgIdLength) {
		this.msgIdLength = msgIdLength;
	}

	public byte[] getMsgid() {
		return msgid;
	}

	public void setMsgid(byte[] msgid) {
		this.msgid = msgid;
	}

	public int getSubId() {
		return subId;
	}

	public void setSubId(int subId) {
		this.subId = subId;
	}

	public byte getAck() {
		return ack;
	}

	public void setAck(byte ack) {
		this.ack = ack;
	}
	
	
}