/
Packet.java
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/
Packet.java
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package com.shinemo.mpush.api.protocol;
import com.shinemo.mpush.api.Constants;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import java.io.Serializable;
import java.util.Arrays;
/**
* Created by ohun on 2015/12/19.
* length(4)+cmd(1)+cc(2)+flags(1)+sessionId(4)+lrc(1)+body(n)
*/
public final class Packet implements Serializable {
public static final byte HB_PACKET = '\n';
private static final long serialVersionUID = -2725825199998223372L;
public byte cmd; //命令
public short cc; //校验码 暂时没有用到
public byte flags; //特性,如是否加密,是否压缩等
public int sessionId; // 会话id。客户端生成。
public byte lrc; // 校验,纵向冗余校验。只校验body
public byte[] body;
public Packet(byte cmd) {
this.cmd = cmd;
}
public Packet(byte cmd, int sessionId) {
this.cmd = cmd;
this.sessionId = sessionId;
}
public int getBodyLength() {
return body == null ? 0 : body.length;
}
public String getStringBody() {
return body == null ? "" : new String(body, Constants.UTF_8);
}
public void setFlag(byte flag) {
this.flags |= flag;
}
public boolean hasFlag(byte flag) {
return (flags & flag) != 0;
}
@Override
public String toString() {
return "Packet{" +
"cmd=" + cmd +
", cc=" + cc +
", flags=" + flags +
", sessionId=" + sessionId +
", lrc=" + lrc +
", body=" + Arrays.toString(body) +
'}';
}
public static ByteBuf getHBPacket() {
return Unpooled.buffer(1).writeByte(HB_PACKET);
}
}