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Editing: CancellationQueue.php

<?php

namespace React\Promise\Internal;

/**
 * @internal
 */
final class CancellationQueue
{
    /** @var bool */
    private $started = false;

/** @var object[] */
    private $queue = [];

public function __invoke(): void
    {
        if ($this->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 = [];
    }
}

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