TaskQueue.php in Lockr 7.3

Namespace

GuzzleHttp\Promise

File

vendor/guzzlehttp/promises/src/TaskQueue.php

<?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\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() {

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

}

Classes

Name	Description
TaskQueue	A task queue that executes tasks in a FIFO order.