/**
  * Sends when the Service is done working, this sends the result to the Worker Handler.
  */
 public function handleResult()
 {
     // No result
     $result = $this->worker->getResult();
     if ($result === null) {
         return;
     }
     // Invalid worker state, wait for a response first.
     if (!$this->isWorkerHandlerReady()) {
         return;
     }
     $this->sendToWorkerHandler(new Protocol\JobResult($this->worker->getRequestId(), $result));
     $this->worker->setState(Worker::RESULT);
 }