vendor/guzzlehttp/promises/src/Utils.php

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<?php

namespace GuzzleHttp\Promise;

final class Utils
{
    /**
     * Get the global task queue used for promise resolution.
     *
     * This task queue MUST be run in an event loop in order for promises to be
     * settled asynchronously. It will be automatically run when synchronously
     * waiting on a promise.
     *
     * <code>
     * while ($eventLoop->isRunning()) {
     *     GuzzleHttp\Promise\Utils::queue()->run();
     * }
     * </code>
     *
     * @param TaskQueueInterface $assign Optionally specify a new queue instance.
     *
     * @return TaskQueueInterface
     */
    public static function queue(TaskQueueInterface $assign = null)
    {
        static $queue;

        if ($assign) {
            $queue = $assign;
        } elseif (!$queue) {
            $queue = new TaskQueue();
        }

        return $queue;
    }

    /**
     * Adds a function to run in the task queue when it is next `run()` and
     * returns a promise that is fulfilled or rejected with the result.
     *
     * @param callable $task Task function to run.
     *
     * @return PromiseInterface
     */
    public static function task(callable $task)
    {
        $queue = self::queue();
        $promise = new Promise([$queue, 'run']);
        $queue->add(function () use ($task, $promise) {
            try {
                if (Is::pending($promise)) {
                    $promise->resolve($task());
                }
            } catch (\Throwable $e) {
                $promise->reject($e);
            } catch (\Exception $e) {
                $promise->reject($e);
            }
        });