org.jgroups.protocols.pbcast.NakAckHeader2 Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS 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.pbcast;


import org.jgroups.Address;
import org.jgroups.Global;
import org.jgroups.Header;
import org.jgroups.util.Bits;
import org.jgroups.util.Util;

import java.io.DataInput;
import java.io.DataOutput;


/**
 * Header used by {@link org.jgroups.protocols.pbcast.NAKACK2}
 * @author Bela Ban
 */
public class NakAckHeader2 extends Header {
    public static final byte MSG           = 1;  // regular msg
    public static final byte XMIT_REQ      = 2;  // retransmit request
    public static final byte XMIT_RSP      = 3;  // retransmit response (contains one or more messages)
    public static final byte HIGHEST_SEQNO = 4;  // the highest sent seqno

    byte      type;
    long      seqno=-1;        // seqno of regular message (MSG, HIGHEST_SEQNO)
    Address   sender;          // the original sender of the message (for XMIT_REQ)


    public NakAckHeader2() {
    }


    public static NakAckHeader2 createMessageHeader(long seqno) {
        return new NakAckHeader2(MSG, seqno);
    }

    public static NakAckHeader2 createXmitRequestHeader(Address orginal_sender) {
        return new NakAckHeader2(XMIT_REQ, orginal_sender);
    }

    public static NakAckHeader2 createXmitResponseHeader() {
        return new NakAckHeader2(XMIT_RSP, -1);
    }

    public static NakAckHeader2 createHighestSeqnoHeader(long seqno) {return new NakAckHeader2(HIGHEST_SEQNO, seqno);}


    /**
     * Constructor for regular messages or XMIT responses
     */
    private NakAckHeader2(byte type, long seqno) {
        this.type=type;
        this.seqno=seqno;
    }


    /**
     * Constructor for retransmit requests (XMIT_REQs) (low and high define the range of msgs)
     */
    private NakAckHeader2(byte type, Address sender) {
        this.type=type;
        this.sender=sender;
    }

    public byte      getType()    {return type;}
    public long      getSeqno()   {return seqno;}
    public Address   getSender()  {return sender;}


    public void writeTo(DataOutput out) throws Exception {
        out.writeByte(type);
        switch(type) {
            case MSG:
            case XMIT_RSP:
            case HIGHEST_SEQNO:
                Bits.writeLong(seqno, out);
                break;
            case XMIT_REQ:
                Util.writeAddress(sender, out);
                break;
        }
    }

    public void readFrom(DataInput in) throws Exception {
        type=in.readByte();
        switch(type) {
            case MSG:
            case XMIT_RSP:
            case HIGHEST_SEQNO:
                seqno=Bits.readLong(in);
                break;
            case XMIT_REQ:
                sender=Util.readAddress(in);
                break;
        }
    }
    

    public int size() {
        int retval=Global.BYTE_SIZE; // type
        switch(type) {
            case MSG:
            case XMIT_RSP:
            case HIGHEST_SEQNO:
                return retval + Bits.size(seqno);

            case XMIT_REQ:
                retval+=Util.size(sender);
                return retval;
        }
        return retval;
    }


    public NakAckHeader2 copy() {
        NakAckHeader2 ret=new NakAckHeader2();
        ret.type=type;
        ret.seqno=seqno;
        ret.sender=sender;
        return ret;
    }


    public static String type2Str(byte t) {
        switch(t) {
            case MSG:           return "MSG";
            case XMIT_REQ:      return "XMIT_REQ";
            case XMIT_RSP:      return "XMIT_RSP";
            case HIGHEST_SEQNO: return "HIGHEST_SEQNO";
            default:            return "";
        }
    }


    public String toString() {
        StringBuilder ret=new StringBuilder();
        ret.append("[").append(type2Str(type));
        switch(type) {
            case MSG:
            case XMIT_RSP: // seqno and sender
            case HIGHEST_SEQNO:
                ret.append(", seqno=").append(seqno);
                break;
            case XMIT_REQ:  // range and sender
                break;
        }

        if(sender != null) ret.append(", sender=").append(sender);
        ret.append(']');
        return ret.toString();
    }


}