<?php

namespace GuzzleHttp\Promise;

/**
 * A task queue that executes tasks in a FIFO order.
 *
 * This task queue class is used to settle promises asynchronously and
 * maintains a constant stack size. You can use the task queue asynchronously
 * by calling the `run()` function of the global task queue in an event loop.
 *
 *     GuzzleHttp\Promise\Utils::queue()->run();
 */
class TaskQueue implements TaskQueueInterface
{
    private $enableShutdown = true;
    private $queue = [];

    public function __construct($withShutdown = true)
    {
        if ($withShutdown) {
            register_shutdown_function(function () {
                if ($this->enableShutdown) {
                    // Only run the tasks if an E_ERROR didn't occur.
                    $err = error_get_last();
                    if (!$err || ($err['type'] ^ E_ERROR)) {
                        $this->run();
                    }
                }
            });
        }
    }

    public function isEmpty()
    {
        return !$this->queue;
    }

    public function add(callable $task)
    {
        $this->queue[] = $task;
    }

    public function run()
    {
        while ($task = array_shift($this->queue)) {
            /** @var callable $task */
            $task();
        }
    }

    /**
     * The task queue will be run and exhausted by default when the process
     * exits IFF the exit is not the result of a PHP E_ERROR error.
     *
     * You can disable running the automatic shutdown of the queue by calling
     * this function. If you disable the task queue shutdown process, then you
     * MUST either run the task queue (as a result of running your event loop
     * or manually using the run() method) or wait on each outstanding promise.
     *
     * Note: This shutdown will occur before any destructors are triggered.
     */
    public function disableShutdown()
    {
        $this->enableShutdown = false;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NzMwMjUxMTIyMTI0MCA1NDk5NDQ2NzMxMjkxMjU4IDczMDQ5NDIxNzMxOTUyNw==