org.jgroups.util.Profiler Maven / Gradle / Ivy

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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));
    }
}