org.jgroups.protocols.TpHeader Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package org.jgroups.protocols;


import org.jgroups.Global;
import org.jgroups.Header;
import org.jgroups.util.AsciiString;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.function.Supplier;


/**
 * Generic transport header, used by TP.
 * @author Bela Ban
 */
public class TpHeader extends Header {
    protected byte[] cluster_name;

    // the next 2 fields are used to measure round-trip times
    public static final byte REQ=1, RSP=2;
    protected byte   flag;  // default: 0, 1: RTT request, 2: RTT response (https://issues.redhat.com/browse/JGRP-2812)
    protected int    index; // used when flag > 0

    public TpHeader() { // used for externalization
    }

    public TpHeader(String n) {
        int len=n.length();
        cluster_name=new byte[len];
        for(int i=0; i < len; i++)
            cluster_name[i]=(byte)n.charAt(i);
    }

    public TpHeader(String n, byte flag, int index) {
        int len=n.length();
        cluster_name=new byte[len];
        for(int i=0; i < len; i++)
            cluster_name[i]=(byte)n.charAt(i);
        this.flag=flag;
        this.index=index;
    }

    public TpHeader(AsciiString n) {
        cluster_name=n != null? n.chars() : null;
    }

    public TpHeader(AsciiString n, byte flag, int index) {
        cluster_name=n != null? n.chars() : null;
        this.flag=flag;
        this.index=index;
    }

    public byte[] getClusterName() {return cluster_name;}
    public byte[] clusterName()    {return cluster_name;}
    public byte   flag()           {return flag;}
    public int    index()          {return index;}


    public TpHeader(byte[] n) {
        cluster_name=n;
    }

    public Supplier create() {return TpHeader::new;}

    public short getMagicId() {return 60;}

    public String toString() {
        return String.format("[cluster=%s]", cluster_name != null ? new String(cluster_name) : "null");
    }


    @Override
    public int serializedSize() {
        int retval=cluster_name != null? Global.SHORT_SIZE + cluster_name.length : Global.SHORT_SIZE;
        return retval+Byte.BYTES + (flag > 0? Integer.BYTES : 0);
    }

    @Override
    public void writeTo(DataOutput out) throws IOException {
        int length=cluster_name != null? cluster_name.length : -1;
        out.writeShort(length);
        if(cluster_name != null)
            out.write(cluster_name, 0, cluster_name.length);
        out.writeByte(flag);
        if(flag > 0)
            out.writeInt(index);
    }

    @Override
    public void readFrom(DataInput in) throws IOException {
        int len=in.readShort();
        if(len >= 0) {
            cluster_name=new byte[len];
            in.readFully(cluster_name, 0, cluster_name.length);
        }
        flag=in.readByte();
        if(flag > 0)
            index=in.readInt();
    }
}