private function trim()
{
if (count($this->queue) > $this->bufferSize) {
array_shift($this->queue);
}
if (null !== $this->scheduler) {
$now = $this->scheduler->now();
while (count($this->queue) > 0 && $now - $this->queue[0]["interval"] > $this->windowSize) {
array_shift($this->queue);
}
}
}
