<?php

namespace React\Promise;

class CancellationQueue
{
    private $started = false;
    private $queue = [];

    public function __invoke()
    {
        if ($this->started) {
            return;
        }

        $this->started = true;
        $this->drain();
    }

    public function enqueue($cancellable)
    {
        if (!\is_object($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()
    {
        for ($i = key($this->queue); isset($this->queue[$i]); $i++) {
            $cancellable = $this->queue[$i];

            $exception = null;

            try {
                $cancellable->cancel();
            } catch (\Throwable $exception) {
            } catch (\Exception $exception) {
            }

            unset($this->queue[$i]);

            if ($exception) {
                throw $exception;
            }
        }

        $this->queue = [];
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NDIxNjU0MjU3OTEwODE5MyAxNzU2MzcwMTE0MzcwNTczIDEzODEyMzM4NjMxMDE1MjM=