public function onKnownPayloadReceived($plugin, Payload $payload, $is_known)
 {
     /** @var TasksPool $tasks_pool */
     $tasks_pool = $this->container['parsley.tasks_pool'];
     $task_name = $payload->getName();
     $task = $tasks_pool->get($task_name);
     $args = Caller::unpackArguments($payload->getArguments(), $task->getArgumentsOrder());
     // TODO: event + subscriber
     // $task->before($payload, $args);
     $this->fireSegmentEvent('before.payload.handling: ' . $task_name, [$payload, $args, $task]);
     $exception = null;
     $result = null;
     try {
         // TODO: event + subscriber
         $result = Caller::call($task, 'callback', $args);
     } catch (\Exception $e) {
         $exception = $e;
     }
     if ($exception) {
         // TODO: event + subscriber
         // $task->failure($exception, $args, $payload);
         $this->fireSegmentEvent('failed.payload.handling: ' . $task_name, [$payload, $exception, $args, $task]);
     } else {
         // TODO: event + subscriber
         //$task->after($result, $args, $payload);
         $this->fireSegmentEvent('successful.payload.handling: ' . $task_name, [$payload, $result, $args, $task]);
     }
     // TODO: event + subscriber
     // $task->always($result, $args, $payload, $exception);
     $this->fireSegmentEvent('done.payload.handling: ' . $task_name, [$payload, $exception, $result, $args, $task]);
 }