private function handle(TaskHandler $handler)
{
if ($handler->isDelayed()) {
$nextRun = $this->currentTick + $handler->getDelay();
} else {
$nextRun = $this->currentTick;
}
$handler->setNextRun($nextRun);
$this->tasks[$handler->getTaskId()] = $handler;
$this->queue->insert($handler, $nextRun);
return $handler;
}