interface TraceableEventDispatcherInterface

ContainerAwareTraceableEventDispatcher.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Debug/ContainerAwareTraceableEventDispatcher.php

EventDataCollector.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/DataCollector/EventDataCollector.php

TestEventDispatcher.php in drupal/core/vendor/symfony/http-kernel/Symfony/Component/HttpKernel/Tests/Fixtures/TestEventDispatcher.php

interface TraceableEventDispatcherInterface {

  /**
   * Gets the called listeners.
   *
   * @return array An array of called listeners
   */
  public function getCalledListeners();

  /**
   * Gets the not called listeners.
   *
   * @return array An array of not called listeners
   */
  public function getNotCalledListeners();

}