*
   * @since 15.0
   */
  public static Stopwatch createStarted() {
    return new Stopwatch().start();
  }

  /**
   * Creates (and starts) a new stopwatch, using the specified time source.
   *
   * @since 15.0
   */
  public static Stopwatch createStarted(Ticker ticker) {
    return new Stopwatch(ticker).start();
  }

  Stopwatch() {

 *
 * @author Kevin Bourrillion
 */
public class StopwatchBenchmark {
  @Benchmark
  long stopwatch(int reps) {
    long total = 0;
    for (int i = 0; i < reps; i++) {
      Stopwatch s = Stopwatch.createStarted();
      // here is where you would do something
      total += s.elapsed(NANOSECONDS);
    }
    return total;
  }

  @Benchmark
  long manual(int reps) {
    long total = 0;

 *
 * @author Kevin Bourrillion
 */
public class StopwatchBenchmark {
  @Benchmark
  long stopwatch(int reps) {
    long total = 0;
    for (int i = 0; i < reps; i++) {
      Stopwatch s = Stopwatch.createStarted();
      // here is where you would do something
      total += s.elapsed(NANOSECONDS);
    }
    return total;
  }

  @Benchmark
  long manual(int reps) {
    long total = 0;

  private final FakeTicker ticker = new FakeTicker();
  private final Stopwatch stopwatch = new Stopwatch(ticker);

  public void testCreateStarted() {
    Stopwatch startedStopwatch = Stopwatch.createStarted();
    assertTrue(startedStopwatch.isRunning());
  }

  public void testCreateUnstarted() {
    Stopwatch unstartedStopwatch = Stopwatch.createUnstarted();
    assertFalse(unstartedStopwatch.isRunning());

      // producing one, will ask for two
      Future<?> producerThread = threadPool.submit(producer);
      producer.beganProducing.await();

      // make sure we time out
      Stopwatch timer = Stopwatch.createStarted();

      int drained = drain(q, newArrayList(), 2, 10, MILLISECONDS, interruptibly);
      assertThat(drained).isAtMost(1);

      assertThat(timer.elapsed(MILLISECONDS)).isAtLeast(10L);

  private final FakeTicker ticker = new FakeTicker();
  private final Stopwatch stopwatch = new Stopwatch(ticker);

  public void testCreateStarted() {
    Stopwatch startedStopwatch = Stopwatch.createStarted();
    assertTrue(startedStopwatch.isRunning());
  }

  public void testCreateUnstarted() {
    Stopwatch unstartedStopwatch = Stopwatch.createUnstarted();
    assertFalse(unstartedStopwatch.isRunning());

    void tryStartTiming(Service service) {
      monitor.enter();
      try {
        Stopwatch stopwatch = startupTimers.get(service);
        if (stopwatch == null) {
          startupTimers.put(service, Stopwatch.createStarted());
        }
      } finally {
        monitor.leave();
      }
    }

    /**
     * Marks the {@link State} as ready to receive transitions. Returns true if no transitions have

    void tryStartTiming(Service service) {
      monitor.enter();
      try {
        Stopwatch stopwatch = startupTimers.get(service);
        if (stopwatch == null) {
          startupTimers.put(service, Stopwatch.createStarted());
        }
      } finally {
        monitor.leave();
      }
    }

    /**
     * Marks the {@link State} as ready to receive transitions. Returns true if no transitions have

      bloomFilter.put(getNonGoldenRandomKey());
    }
    bloomFilter.put(GOLDEN_PRESENT_KEY);

    int numThreads = 12;
    final double safetyFalsePositiveRate = 0.1;
    final Stopwatch stopwatch = Stopwatch.createStarted();

    Runnable task =
        new Runnable() {
          @Override
          public void run() {
            do {
              // We can't have a GOLDEN_NOT_PRESENT_KEY because false positives are

    protected abstract void sleepMicrosUninterruptibly(long micros);

    public static SleepingStopwatch createFromSystemTimer() {
      return new SleepingStopwatch() {
        final Stopwatch stopwatch = Stopwatch.createStarted();

        @Override
        protected long readMicros() {
          return stopwatch.elapsed(MICROSECONDS);
        }

        @Override