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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.annotations.MBean;
import org.jgroups.annotations.ManagedOperation;
import org.jgroups.stack.Protocol;
import org.jgroups.Event;
import org.jgroups.Message;
import org.jgroups.Address;
import org.jgroups.View;
import org.jgroups.annotations.ManagedAttribute;
import org.jgroups.util.MessageBatch;

import java.util.*;

/**
 * Provides various stats
 * @author Bela Ban
 */
@MBean(description="Protocol which exposes various statistics")
public class STATS extends Protocol {
    long sent_msgs, sent_bytes, sent_ucasts, sent_mcasts, received_ucasts, received_mcasts;
    long received_msgs, received_bytes, sent_ucast_bytes, sent_mcast_bytes, received_ucast_bytes, received_mcast_bytes;

    /** HashMap, maintains stats per target destination */
    HashMap sent=new HashMap();

    /** HashMap, maintains stats per receiver */
    HashMap received=new HashMap();

    static final short UP=1;
    static final short DOWN=2;


    public void resetStats() {
        sent_msgs=sent_bytes=sent_ucasts=sent_mcasts=received_ucasts=received_mcasts=0;
        received_msgs=received_bytes=sent_ucast_bytes=sent_mcast_bytes=received_ucast_bytes=received_mcast_bytes=0;
        sent.clear();
        received.clear();
    }

    @ManagedAttribute
    public long getSentMessages() {return sent_msgs;}
    @ManagedAttribute
    public long getSentBytes() {return sent_bytes;}
    @ManagedAttribute
    public long getSentUnicastMessages() {return sent_ucasts;}
    @ManagedAttribute
    public long getSentUnicastBytes() {return sent_ucast_bytes;}
    @ManagedAttribute
    public long getSentMcastMessages() {return sent_mcasts;}
    @ManagedAttribute
    public long getSentMcastBytes() {return sent_mcast_bytes;}

    @ManagedAttribute
    public long getReceivedMessages() {return received_msgs;}
    @ManagedAttribute
    public long getReceivedBytes() {return received_bytes;}
    @ManagedAttribute
    public long getReceivedUnicastMessages() {return received_ucasts;}
    @ManagedAttribute
    public long getReceivedUnicastBytes() {return received_ucast_bytes;}
    @ManagedAttribute
    public long getReceivedMcastMessages() {return received_mcasts;}
    @ManagedAttribute
    public long getReceivedMcastBytes() {return received_mcast_bytes;}


    public Object up(Event evt) {
        if(evt.getType() == Event.VIEW_CHANGE)
            handleViewChange(evt.getArg());
        return up_prot.up(evt);
    }

    public Object up(Message msg) {
        updateStats(msg, UP);
        return up_prot.up(msg);
    }

    public void up(MessageBatch batch) {
        for(Message msg: batch)
            updateStats(msg, UP);
        up_prot.up(batch);
    }

    public Object down(Event evt) {
        if(evt.getType() == Event.VIEW_CHANGE)
            handleViewChange(evt.getArg());
        return down_prot.down(evt);
    }

    public Object down(Message msg) {
        updateStats(msg, DOWN);
        return down_prot.down(msg);
    }

    @ManagedOperation
    public String printStats() {
        Map.Entry entry;
        Object key, val;
        StringBuilder sb=new StringBuilder();
        sb.append("sent:\n");
        for(Iterator it=sent.entrySet().iterator(); it.hasNext();) {
            entry=(Map.Entry)it.next();
            key=entry.getKey();
            if(key == null) key="";
            val=entry.getValue();
            sb.append(key).append(": ").append(val).append("\n");
        }
        sb.append("\nreceived:\n");
        for(Iterator it=received.entrySet().iterator(); it.hasNext();) {
            entry=(Map.Entry)it.next();
            key=entry.getKey();
            val=entry.getValue();
            sb.append(key).append(": ").append(val).append("\n");
        }

        return sb.toString();
    }

    private void handleViewChange(View view) {
        List members=view.getMembers();
        Set tmp=new LinkedHashSet(members);
        tmp.add(null); // for null destination (= mcast)
        sent.keySet().retainAll(tmp);
        received.keySet().retainAll(tmp);
    }

    private void updateStats(Message msg, short direction) {
        int     length;
        HashMap map;
        boolean mcast;
        Address dest, src;

        if(msg == null) return;
        length=msg.getLength();
        dest=msg.getDest();
        src=msg.getSrc();
        mcast=dest == null;

        if(direction == UP) { // received
            received_msgs++;
            received_bytes+=length;
            if(mcast) {
                received_mcasts++;
                received_mcast_bytes+=length;
            }
            else {
                received_ucasts++;
                received_ucast_bytes+=length;
            }
        }
        else {                // sent
            sent_msgs++;
            sent_bytes+=length;
            if(mcast) {
                sent_mcasts++;
                sent_mcast_bytes+=length;
            }
            else {
                sent_ucasts++;
                sent_ucast_bytes+=length;
            }
        }

        Address key=direction == UP? src : dest;
        map=direction == UP? received : sent;
        Entry entry=(Entry)map.get(key);
        if(entry == null) {
            entry=new Entry();
            map.put(key, entry);
        }
        entry.msgs++;
        entry.bytes+=length;
        if(mcast) {
            entry.mcasts++;
            entry.mcast_bytes+=length;
        }
        else {
            entry.ucasts++;
            entry.ucast_bytes+=length;
        }
    }




    static class Entry {
        long msgs, bytes, ucasts, mcasts, ucast_bytes, mcast_bytes;

        public String toString() {
            StringBuilder sb=new StringBuilder();
            sb.append(msgs).append(" (").append(bytes).append(" bytes)")
                    .append(": ").append(ucasts).append(" ucasts (").append(ucast_bytes)
                    .append(" bytes), ").append(mcasts).append(" mcasts (").append(mcast_bytes).append(" bytes)");
            return sb.toString();
        }
    }



}