vendor/league/tactician/src/Plugins/LockingMiddleware.php line 33

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  1. <?php
  3. namespace League\Tactician\Plugins;
  5. use League\Tactician\Middleware;
  7. /**
  8. * If another command is already being executed, locks the command bus and
  9. * queues the new incoming commands until the first has completed.
  10. */
  11. class LockingMiddleware implements Middleware
  12. {
  13. /**
  14. * @var bool
  15. */
  16. private $isExecuting;
  18. /**
  19. * @var callable[]
  20. */
  21. private $queue = [];
  23. /**
  24. * Execute the given command... after other running commands are complete.
  25. *
  26. * @param object $command
  27. * @param callable $next
  28. *
  29. * @throws \Exception
  30. *
  31. * @return mixed|void
  32. */
  33. public function execute($command, callable $next)
  34. {
  35. $this->queue[] = function () use ($command, $next) {
  36. return $next($command);
  37. };
  39. if ($this->isExecuting) {
  40. return;
  41. }
  42. $this->isExecuting = true;
  44. try {
  45. $returnValue = $this->executeQueuedJobs();
  46. } catch (\Exception $e) {
  47. $this->isExecuting = false;
  48. $this->queue = [];
  49. throw $e;
  50. }
  52. $this->isExecuting = false;
  53. return $returnValue;
  54. }
  56. /**
  57. * Process any pending commands in the queue. If multiple, jobs are in the
  58. * queue, only the first return value is given back.
  59. *
  60. * @return mixed
  61. */
  62. protected function executeQueuedJobs()
  63. {
  64. $returnValues = [];
  65. while ($resumeCommand = array_shift($this->queue)) {
  66. $returnValues[] = $resumeCommand();
  67. }
  69. return array_shift($returnValues);
  70. }
  71. }