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<?php
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declare(strict_types=1);
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namespace GuzzleHttp\Promise;
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/**
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 * A task queue that executes tasks in a FIFO order.
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 *
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 * This task queue class is used to settle promises asynchronously and
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 * maintains a constant stack size. You can use the task queue asynchronously
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 * by calling the `run()` function of the global task queue in an event loop.
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 *
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 *     GuzzleHttp\Promise\Utils::queue()->run();
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 *
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 * @final
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 */
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class TaskQueue implements TaskQueueInterface
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{
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    private $enableShutdown = true;
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    private $queue = [];
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    public function __construct(bool $withShutdown = true)
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    {
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        if ($withShutdown) {
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            register_shutdown_function(function (): void {
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                if ($this->enableShutdown) {
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                    // Only run the tasks if an E_ERROR didn't occur.
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                    $err = error_get_last();
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                    if (!$err || ($err['type'] ^ E_ERROR)) {
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                        $this->run();
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                    }
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                }
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            });
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        }
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    }
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    public function isEmpty(): bool
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    {
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        return !$this->queue;
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    }
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    public function add(callable $task): void
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    {
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        $this->queue[] = $task;
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    }
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    public function run(): void
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    {
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        while ($task = array_shift($this->queue)) {
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            /** @var callable $task */
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            $task();
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        }
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    }
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    /**
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     * The task queue will be run and exhausted by default when the process
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     * exits IFF the exit is not the result of a PHP E_ERROR error.
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     *
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     * You can disable running the automatic shutdown of the queue by calling
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     * this function. If you disable the task queue shutdown process, then you
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     * MUST either run the task queue (as a result of running your event loop
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     * or manually using the run() method) or wait on each outstanding promise.
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     *
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     * Note: This shutdown will occur before any destructors are triggered.
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     */
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    public function disableShutdown(): void
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    {
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        $this->enableShutdown = false;
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    }
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}