started) { return; } $this->started = \true; $this->drain(); } /** * @param mixed $cancellable */ public function enqueue($cancellable) : void { if (!\is_object($cancellable) || !\method_exists($cancellable, 'then') || !\method_exists($cancellable, 'cancel')) { return; } $length = \array_push($this->queue, $cancellable); if ($this->started && 1 === $length) { $this->drain(); } } private function drain() : void { for ($i = \key($this->queue); isset($this->queue[$i]); $i++) { $cancellable = $this->queue[$i]; \assert(\method_exists($cancellable, 'cancel')); $exception = null; try { $cancellable->cancel(); } catch (\Throwable $exception) { } unset($this->queue[$i]); if ($exception) { throw $exception; } } $this->queue = []; } }