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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.util;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static org.jgroups.util.Util.printTime;

/**
 * Maintains averages for time values measured between {@link #start} and {@link #stop}.
 * @author Bela Ban
 * @since  5.2.13
 */
public class Profiler {
    protected final AverageMinMax    avg=new AverageMinMax().unit(NANOSECONDS);
    protected final Map threads=new ConcurrentHashMap<>();
    protected boolean                print_details=true;


    public Profiler() {
    }

    public boolean  details()          {return print_details;}
    public Profiler details(boolean d) {print_details=d; return this;}

    public void reset() {
        threads.clear();
        synchronized(avg) {
            avg.clear();
        }
    }

    public void start() {
        Thread curr=Thread.currentThread();
        threads.put(curr, System.nanoTime());
    }

    public void stop() {
        Thread curr_thread=Thread.currentThread();
        Long start=threads.remove(curr_thread);
        if(start != null) {
            long time=System.nanoTime() - start;
            synchronized(avg) {
                avg.add(time);
            }
        }
    }

    @Override
    public String toString() {
        if(avg.count() == 0)
            return "n/a";
        return print_details? String.format("min/avg/max=%s/%s/%s", printTime(avg.min(), NANOSECONDS),
                                            printTime(avg.average(), NANOSECONDS), printTime(avg.max(), NANOSECONDS))
          : String.format("avg=%s", printTime(avg.average(), NANOSECONDS));
    }
}