/**
* Determine if a request should be dropped to reduce load.
*
* @see Degrader#checkDrop(double)
*/
public boolean checkDrop(double code) {
long now = _clock.currentTimeMillis();
checkStale(now);
_countTotal.incrementAndGet();
double dropRate = _dropRate;
double computedDropRate = _computedDropRate;
boolean drop;
if (code < dropRate) {
long lastNotDropped = _lastNotDroppedTime.get();
if ((lastNotDropped + _maxDropDuration) <= now) {
drop = !_lastNotDroppedTime.compareAndSet(lastNotDropped, now);
} else {
drop = true;
}
if (drop) {
_droppedCountTotal.incrementAndGet();
}
} else {
drop = false;
_lastNotDroppedTime.set(now);
}
if (code < computedDropRate) {
_noOverrideDropCountTotal.incrementAndGet();
}
return drop;
}
public synchronized void reset() {
setComputedDropRate(0.0);
_lastIntervalCountTotal = 0;
_lastIntervalDroppedCountTotal = 0;
_lastIntervalDroppedRate = 0.0;
_lastResetTime = _clock.currentTimeMillis();
_lastNotDroppedTime.set(_lastResetTime);
_countTotal.set(0);
_noOverrideDropCountTotal.set(0);
_droppedCountTotal.set(0);
}
public synchronized Stats getStats() {
checkStale(_clock.currentTimeMillis());
return new Stats(
_dropRate,
_computedDropRate,
_countTotal.get(),
_noOverrideDropCountTotal.get(),
_droppedCountTotal.get(),
_lastNotDroppedTime.get(),
_callTrackerStats.getInterval(),
_callTrackerStats.getIntervalEndTime(),
_lastIntervalDroppedRate,
_callTrackerStats.getCallCount(),
_latency,
_callTrackerStats.getErrorRate(),
_outstandingLatency,
_callTrackerStats.getOutstandingCount(),
_callTrackerStats.getErrorTypeCountsTotal());
}