/// <summary>
/// Times and records the duration of an event
/// </summary>
/// <param name="action">a <see cref="Action"/> whose <see cref="Action.Invoke"/> is timed</param>
public void Time(Action action)
{
long startTime = clock.getTick();
try
{
action.Invoke();
}
finally
{
update(this.clock.getTick() - startTime);
}
}
/// <summary>
/// Updates the timer with the difference between current and start time. Call to this method will
/// not reset the start time. Multiple calls result in multiple updates.
/// </summary>
/// <returns>the elapsed time in nanoseconds</returns>
public long stop()
{
long elapsed = clock.getTick() - startTime;
timer.Update(elapsed, TimeUnit.Nanoseconds);
return(elapsed);
}
private void rescaleIfNeeded()
{
var now = clock.getTick();
var next = _nextScaleTime.Get();
if (now >= next)
{
Rescale(now, next);
}
}
/// <summary>
/// /// Creates a new ExponentiallyDecayingReservoir
/// </summary>
/// <param name="size">The number of samples to keep in the sampling reservoir</param>
/// <param name="alpha">The exponential decay factor; the higher this is, the more biased the sample will be towards newer values</param>
/// <param name="clock">the clock used to timestamp samples and track rescaling</param>
public ExponentiallyDecayingReservoir(int size, double alpha, Clock clock)
{
_values = new ConcurrentDictionary <double, WeightedSample>();
_lock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
_alpha = alpha;
_size = size;
this.clock = clock;
this._count = new AtomicLong(0);
this._startTime = CurrentTimeInSeconds();
this._nextScaleTime = new AtomicLong(clock.getTick() + RESCALE_THRESHOLD);
}
/// <summary>
/// /// Creates a new ExponentiallyDecayingReservoir
/// </summary>
/// <param name="size">The number of samples to keep in the sampling reservoir</param>
/// <param name="alpha">The exponential decay factor; the higher this is, the more biased the sample will be towards newer values</param>
/// <param name="clock">the clock used to timestamp samples and track rescaling</param>
public ExponentiallyDecayingReservoir(int size, double alpha, Clock clock)
{
_values = new ConcurrentDictionary<double, WeightedSample>();
_lock = new ReaderWriterLockSlim(LockRecursionPolicy.SupportsRecursion);
_alpha = alpha;
_size = size;
this.clock = clock;
this._count = new AtomicLong(0);
this._startTime = CurrentTimeInSeconds();
this._nextScaleTime = new AtomicLong(clock.getTick() + RESCALE_THRESHOLD);
}
private bool shouldLoad()
{
for (;;)
{
long time = clock.getTick();
long currentReload = reloadAt.Get();
if (currentReload > time)
{
return(false);
}
if (reloadAt.CompareAndSet(currentReload, time + timeoutNS))
{
return(true);
}
}
}
private void tickIfNecessary()
{
long oldTick = _lastTick.Get();
long newTick = clock.getTick();
long age = newTick - oldTick;
if (age > TICK_INTERVAL)
{
long newIntervalStartTick = newTick - age % TICK_INTERVAL;
if (_lastTick.CompareAndSet(oldTick, newIntervalStartTick))
{
long requiredTicks = age / TICK_INTERVAL;
for (long i = 0; i < requiredTicks; i++)
{
_m1Rate.Tick();
_m5Rate.Tick();
_m15Rate.Tick();
}
}
}
}
internal Context(Timer timer, Clock clock)
{
this.timer = timer;
this.clock = clock;
this.startTime = clock.getTick();
}
