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<?php |
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|
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namespace React\Promise; |
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|
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class CancellationQueue |
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{ |
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private $started = false; |
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private $queue = []; |
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|
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public function __invoke() |
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{ |
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if ($this->started) { |
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return; |
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} |
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|
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$this->started = true; |
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$this->drain(); |
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} |
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|
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public function enqueue($cancellable) |
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{ |
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if (!method_exists($cancellable, 'then') || !method_exists($cancellable, 'cancel')) { |
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return; |
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} |
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|
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$length = array_push($this->queue, $cancellable); |
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|
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if ($this->started && 1 === $length) { |
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$this->drain(); |
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} |
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} |
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|
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private function drain() |
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{ |
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for ($i = key($this->queue); isset($this->queue[$i]); $i++) { |
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$cancellable = $this->queue[$i]; |
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|
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$exception = null; |
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|
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try { |
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$cancellable->cancel(); |
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} catch (\Throwable $exception) { |
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} catch (\Exception $exception) { |
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} |
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|
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unset($this->queue[$i]); |
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|
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if ($exception) { |
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throw $exception; |
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} |
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} |
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|
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$this->queue = []; |
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} |
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} |
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|
