//      last modified: 105 seconds ago
    //             served:   5 seconds ago
    //   default lifetime: (105 - 5) / 10 = 10 seconds
    //            expires:  10 seconds from served date = 5 seconds from now
    server.enqueue(
      MockResponse
        .Builder()
        .addHeader("Last-Modified: " + formatDate(-105, TimeUnit.SECONDS))
        .addHeader("Date: " + formatDate(-5, TimeUnit.SECONDS))

     */
    private long determinePollInterval(ChangeNotificationHandle handle) {
        int failures = getFailureCount(handle);

        // Base interval starts at 1 second, increases with failures
        // Max interval is 30 seconds for inactive directories
        return Math.min(MAX_POLL_INTERVAL, BASE_POLL_INTERVAL + (failures * 2000));
    }

    /**
     * Get failure count for a handle
     *

		avg = l.rttMsSum / float64(l.successRequestCount)
	}
	now := time.Now().UTC()
	return Metrics{
		LastReachableSecs:   now.Sub(o.serviceMetrics.LastCheckSuccess).Seconds(),
		LastUnreachableSecs: now.Sub(o.serviceMetrics.LastCheckFailure).Seconds(),
		TotalRequests:       l.failedRequestCount + l.successRequestCount,
		FailedRequests:      l.failedRequestCount,
		AvgSuccRTTMs:        avg,
		MaxSuccRTTMs:        l.maxRttMs,

                        barrier.await(1, SECONDS);

                        // WAIT #2
                        barrier.await(1, SECONDS);
                        assertTrue(executor.isShutdown());
                        assertFalse(executor.isTerminated());

                        // WAIT #3
                        barrier.await(1, SECONDS);
                        return null;
                      });

                    }
                } finally {
                    latch.countDown();
                }
            });
        }

        // Then
        assertTrue(latch.await(10, TimeUnit.SECONDS), "All threads should complete");
        executor.shutdown();
        assertEquals(0, collisions.get(), "There should be no nonce collisions");

	var (
		// We check every 15 seconds if the disk is writable and we can read back.
		checkEvery = 15 * time.Second

		// If the disk has completed an operation successfully within last 5 seconds, don't check it.
		skipIfSuccessBefore = 5 * time.Second
	)

	// if disk max timeout is smaller than checkEvery window
	// reduce checks by a second.
	if globalDriveConfig.GetMaxTimeout() <= checkEvery {

    assertTrue(limiter.tryAcquire(0, SECONDS));
    assertFalse(limiter.tryAcquire(0, SECONDS));
    assertFalse(limiter.tryAcquire(0, SECONDS));
    stopwatch.sleepMillis(100);
    assertFalse(limiter.tryAcquire(0, SECONDS));
  }

  public void testTryAcquire_someWaitAllowed() {
    RateLimiter limiter = RateLimiter.create(5.0, stopwatch);
    assertTrue(limiter.tryAcquire(0, SECONDS));

    assertTrue(limiter.tryAcquire(0, SECONDS));
    assertFalse(limiter.tryAcquire(0, SECONDS));
    assertFalse(limiter.tryAcquire(0, SECONDS));
    stopwatch.sleepMillis(100);
    assertFalse(limiter.tryAcquire(0, SECONDS));
  }

  public void testTryAcquire_someWaitAllowed() {
    RateLimiter limiter = RateLimiter.create(5.0, stopwatch);
    assertTrue(limiter.tryAcquire(0, SECONDS));

    @Keep public static final WithPublicConstants SECOND = new WithPublicConstants();
  }

  private static class FirstConstantIsNull {
    // To test that null constant is ignored
    @Keep public static final @Nullable FirstConstantIsNull FIRST = null;

    @Keep public static final FirstConstantIsNull SECOND = new FirstConstantIsNull();
  }

  public static class NonFinalFieldIgnored {

    var throttleBytesPerPeriod: Long = mockResponse.throttleBytesPerPeriod
    throttleBytesPerPeriod = mockResponse.throttleBytesPerPeriod
    var throttlePeriod: Long = mockResponse.getThrottlePeriod(TimeUnit.SECONDS)
    mockResponse = mockResponse.setBodyDelay(0L, TimeUnit.SECONDS)
    val bodyDelay: Long = mockResponse.getBodyDelay(TimeUnit.SECONDS)