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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.tom;

import java.util.EnumMap;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

/**
 * This collects the stats and some profiling information
 *
 * @author Pedro Ruivo
 * @since 3.1
 */
public class StatsCollector {

    private enum Counter {
        PROPOSE_MESSAGE_RECEIVED,
        LAST_PROPOSE_MESSAGE_RECEIVED,
        FINAL_MESSAGE_RECEIVED,
        DATA_MESSAGE_RECEIVED,
        ANYCAST_MESSAGE_SENT,
        ANYCAST_MESSAGE_DELIVERED,
        UNICAST_MESSAGE_SENT
    }

    private enum Duration {
        PROPOSE_MESSAGE,
        LAST_PROPOSE_MESSAGE,
        FINAL_MESSAGE,
        DATA_MESSAGE,
        ANYCAST_MESSAGE_SENT
    }

    //from javadoc: Enum maps are represented internally as arrays. This representation is extremely compact and efficient. 
    //this way is simple to add new stats and avoids create N field with atomic long or atomic integer. 
    private EnumMap counters;
    private EnumMap durations;

    public StatsCollector() {
        counters = new EnumMap<>(Counter.class);
        durations = new EnumMap<>(Duration.class);

        for (Counter counter : Counter.values()) {
            counters.put(counter, new AtomicInteger(0));
        }

        for (Duration duration : Duration.values()) {
            durations.put(duration, new AtomicLong(0));
        }
    }

    private volatile boolean statsEnabled;

    private boolean shouldCollectStats(long... values) {
        if (!statsEnabled) {
            return false;
        }
        for (long value : values) {
            if (value < 0) {
                return false;
            }
        }
        return true;
    }

    private static double convertNanosToMillis(long nanos) {
        return nanos / 1000000.0;
    }

    public void setStatsEnabled(boolean statsEnabled) {
        this.statsEnabled = statsEnabled;
    }

    public void clearStats() {
        for (AtomicInteger counter : counters.values()) {
            counter.set(0);
        }

        for (AtomicLong duration : durations.values()) {
            duration.set(0);
        }
    }

    public long now() {
        return statsEnabled ? System.nanoTime() : -1;
    }

    public void addProposeSequenceNumberDuration(long durationValue, boolean isLastProposeMessage) {
        if (!shouldCollectStats(durationValue)) {
            return;
        }
        Counter counter = isLastProposeMessage ? Counter.LAST_PROPOSE_MESSAGE_RECEIVED :
                Counter.PROPOSE_MESSAGE_RECEIVED;
        Duration duration = isLastProposeMessage ? Duration.LAST_PROPOSE_MESSAGE :
                Duration.PROPOSE_MESSAGE;

        counters.get(counter).incrementAndGet();
        durations.get(duration).addAndGet(durationValue);
    }

    public void addFinalSequenceNumberDuration(long duration) {
        if (!shouldCollectStats(duration)) {
            return;
        }

        counters.get(Counter.FINAL_MESSAGE_RECEIVED).incrementAndGet();
        durations.get(Duration.FINAL_MESSAGE).addAndGet(duration);
    }

    public void addDataMessageDuration(long duration) {
        if (!shouldCollectStats(duration)) {
            return;
        }

        counters.get(Counter.DATA_MESSAGE_RECEIVED).incrementAndGet();
        durations.get(Duration.DATA_MESSAGE).addAndGet(duration);
    }

    public void addAnycastSentDuration(long duration, int numberOfUnicasts) {
        if (!shouldCollectStats(duration)) {
            return;
        }

        counters.get(StatsCollector.Counter.UNICAST_MESSAGE_SENT).addAndGet(numberOfUnicasts);
        counters.get(Counter.ANYCAST_MESSAGE_SENT).incrementAndGet();
        durations.get(Duration.ANYCAST_MESSAGE_SENT).addAndGet(duration);
    }

    public void incrementMessageDeliver() {
        if (!shouldCollectStats()) {
            return ;
        }
        counters.get(Counter.ANYCAST_MESSAGE_DELIVERED).incrementAndGet();
    }

    public double getAvgDataMessageReceivedDuration() {
        int count = counters.get(Counter.DATA_MESSAGE_RECEIVED).get();
        if (count > 0) {
            long dur = durations.get(Duration.DATA_MESSAGE).get();
            return convertNanosToMillis(dur) / count;
        }
        return 0D;
    }

    public double getAvgAnycastSentDuration() {
        int count = counters.get(Counter.ANYCAST_MESSAGE_SENT).get();
        if (count > 0) {
            long dur = durations.get(Duration.ANYCAST_MESSAGE_SENT).get();
            return convertNanosToMillis(dur) / count;
        }
        return 0D;
    }

    public double getAvgProposeMesageReceivedDuration() {
        int count = counters.get(Counter.PROPOSE_MESSAGE_RECEIVED).get();
        if (count > 0) {
            long dur = durations.get(Duration.PROPOSE_MESSAGE).get();
            return convertNanosToMillis(dur) / count;
        }
        return 0D;
    }

    public double getAvgLastProposeMessageReceivedDuration() {
        int count = counters.get(Counter.LAST_PROPOSE_MESSAGE_RECEIVED).get();
        if (count > 0) {
            long dur = durations.get(Duration.LAST_PROPOSE_MESSAGE).get();
            return convertNanosToMillis(dur) / count;
        }
        return 0D;
    }

    public double getAvgFinalMessageReceivedDuration() {
        int count = counters.get(Counter.FINAL_MESSAGE_RECEIVED).get();
        if (count > 0) {
            long dur = durations.get(Duration.FINAL_MESSAGE).get();
            return convertNanosToMillis(dur) / count;
        }
        return 0D;
    }

    public int getNumberOfAnycastMessagesSent() {
        return counters.get(Counter.ANYCAST_MESSAGE_SENT).get();
    }

    public int getAnycastDelivered() {
        return counters.get(Counter.ANYCAST_MESSAGE_DELIVERED).get();
    }

    public int getNumberOfProposeMessagesReceived() {
        return counters.get(Counter.PROPOSE_MESSAGE_RECEIVED).get() +
                counters.get(Counter.LAST_PROPOSE_MESSAGE_RECEIVED).get();
    }

    public int getNumberOfProposeMessagesSent() {
        //we send a propose message for each data message received
        return counters.get(Counter.DATA_MESSAGE_RECEIVED).get();
    }

    public int getNumberOfFinalAnycastsSent() {
        //we send 1 final group message when the last propose is received
        return counters.get(Counter.LAST_PROPOSE_MESSAGE_RECEIVED).get();
    }

    public int getNumberOfFinalMessagesDelivered() {
        return counters.get(Counter.FINAL_MESSAGE_RECEIVED).get();
    }

    public double getAvgNumberOfUnicastSentPerAnycast() {
        int multicast = counters.get(Counter.ANYCAST_MESSAGE_SENT).get();
        if (multicast > 0) {
            int unicast = counters.get(Counter.UNICAST_MESSAGE_SENT).get();
            return unicast * 1.0 / multicast;
        }
        return 0D;
    }
}