protected function createData()
 {
     $model1 = new ModelState();
     $model1->setWorkflowIdentifier('a1b2c3');
     $model1->setCreatedAt(new \DateTime('2012-02-12'));
     $model1->setProcessName('process_1');
     $model1->setStepName('step_A');
     $model1->setSuccessful(true);
     $this->em->persist($model1);
     $model2 = new ModelState();
     $model2->setWorkflowIdentifier('a1b2c3');
     $model2->setCreatedAt(new \DateTime('2012-02-14'));
     $model2->setProcessName('process_1');
     $model2->setStepName('step_B');
     $model2->setSuccessful(true);
     $this->em->persist($model2);
     $model3 = new ModelState();
     $model3->setWorkflowIdentifier('a1b2c3');
     $model3->setCreatedAt(new \DateTime('2012-02-20'));
     $model3->setProcessName('process_1');
     $model3->setStepName('step_C');
     $model3->setSuccessful(false);
     $this->em->persist($model3);
     $model4 = new ModelState();
     $model4->setWorkflowIdentifier('a1b2c3');
     $model4->setCreatedAt(new \DateTime('2012-02-20'));
     $model4->setProcessName('process_2');
     $model4->setStepName('step_A');
     $model4->setSuccessful(false);
     $this->em->persist($model4);
     $this->em->flush();
 }
 /**
  * Create a new model state.
  *
  * @param  ModelInterface                                 $model
  * @param  string                                         $processName
  * @param  string                                         $stepName
  * @param  ModelState                                     $previous
  * @return \Vas24x7\WorkflowBundle\Entity\ModelState
  */
 protected function createModelState(ModelInterface $model, $processName, $stepName, $previous = null)
 {
     $modelState = new ModelState();
     $modelState->setWorkflowIdentifier($model->getWorkflowIdentifier());
     $modelState->setProcessName($processName);
     $modelState->setStepName($stepName);
     $modelState->setData($model->getWorkflowData());
     $modelState->setCreatedBy($this->tokenStorage->getToken()->getUsername());
     if ($previous instanceof ModelState) {
         $modelState->setPrevious($previous);
     }
     return $modelState;
 }