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

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

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).

There is a newer version: 35.0.0.Beta1

Show newest version


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.Range;
import org.jgroups.util.Util;

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


/**
 * @author Bela Ban
 */
public class NakAckHeader 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)

    byte  type=0;
    long  seqno=-1;        // seqno of regular message (MSG)
    Range range=null;      // range of msgs to be retransmitted (XMIT_REQ)
    Address sender;        // the original sender of the message (for XMIT_REQ)


    public NakAckHeader() {
    }


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

    public static NakAckHeader createXmitRequestHeader(long low, long high, Address orginal_sender) {
        return new NakAckHeader(XMIT_REQ, low, high, orginal_sender);
    }

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


    /**
     * Constructor for regular messages or XMIT responses
     */
    private NakAckHeader(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 NakAckHeader(byte type, long low, long high, Address sender) {
        this.type=type;
        range=new Range(low, high);
        this.sender=sender;
    }

    public byte getType() {
        return type;
    }

    public long getSeqno() {
        return seqno;
    }

    public Range getRange() {
        return range;
    }

    public Address getSender() {
        return sender;
    }


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

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

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

            case XMIT_REQ:
                retval+=Global.BYTE_SIZE; // presence for range
                if(range != null)
                    retval+=range.serializedSize();
                retval+=Util.size(sender);
                return retval;
        }
        return retval;
    }


    public NakAckHeader copy() {
        NakAckHeader ret=new NakAckHeader();
        ret.type=type;
        ret.seqno=seqno;
        ret.range=range;
        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";
            default:
                return "";
        }
    }


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

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


}