@Override
 public Collection<NodeInstanceSummary> getProcessInstanceCompletedNodes(long processInstanceId) {
   ProcessInstanceDesc piDesc = dataService.getProcessInstanceById(processInstanceId);
   return NodeInstanceHelper.adaptCollection(
       dataService.getProcessInstanceCompletedNodes(piDesc.getSessionId(), processInstanceId));
 }
 public Collection<NodeInstanceSummary> getProcessInstanceFullHistory(long processInstanceId) {
   ProcessInstanceDesc piDesc = dataService.getProcessInstanceById(processInstanceId);
   return NodeInstanceHelper.adaptCollection(
       dataService.getProcessInstanceFullHistory(piDesc.getSessionId(), processInstanceId));
 }