package com.ard.tianyu.netty.handler;// MessageProtocolDecoder.java
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import com.ard.tianyu.netty.command.BaseCommand;
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import com.ard.tianyu.netty.command.HeartbeatReplyCommand;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.handler.codec.ByteToMessageDecoder;
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import lombok.extern.slf4j.Slf4j;
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import java.util.List;
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@Slf4j
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public class MessageProtocolDecoder extends ByteToMessageDecoder {
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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// 检查可读字节数是否足够
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if (in.readableBytes() < 4) {
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return; // 不足以读取头部
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}
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in.markReaderIndex(); // 标记当前读取位置
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short dataHead = in.readShort();
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if(dataHead != 0x6A77){
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return;
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}
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short dataLength = in.readShort();
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if (in.readableBytes() < dataLength) {
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in.resetReaderIndex(); // 如果不足，重置读取位置
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return;
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}
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byte cmdCode = in.readByte();
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BaseCommand command = null;
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// 根据 cmdCode 创建相应消息对象
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if (cmdCode == 0x01) { // 注册回复消息
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byte success = in.readByte(); // 读取是否成功
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log.info("注册回复: {}", success == 0x01 ? "成功" : "失败");
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}
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if (cmdCode == 0x02) { // 注册回复消息
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long timestamp = in.readLong(); // 读取时间戳
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command = new HeartbeatReplyCommand(timestamp); // 创建心跳回复对象
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log.info("心跳回复: 时间戳 {}", timestamp);
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}
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if (command != null) {
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out.add(command); // 添加解码的命令对象到输出列表
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} else {
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// log.warn("无法识别的命令码: {}", cmdCode);
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}
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}
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}
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