Assign role, group to Human Task when initiated

Question

Hi all,
Currently, when user login to BPM and create new task instance, i can get roles and groups of that user by programming. I want to assign roles of user to that task instance dynamically when user click SUBMIT button (Because i want to restrict users belong role are able to do this task, each user belong to a role and group can do it).
Somebody help?
Thanks.

Answer 1

Hi Ming
1. If you want to intercept any Actions from a Task like Save, Submit, Approve, Reject etc, you can create your own class like MyAppTaskValidationCallback that implements oracle.bpel.services.workflow.task.ITaskValidationCallback and in this overwrite one method named validateTaskOperation(bunch of parameters). See APIs for this.
In this method, you can get the action performed on the task. Also you can get the complete Payload of the Task including your custom payload and the standard Task Payload stuff like History, Attachments, Comments etc. You can write some simple XML Parser utility methods to get and set attributes in the Payload xsd schema. So in your case, in this method, get Roles, Groups of the logged in user. Check the action performed. If he is not allowed to do that operation, throw the error from this method. Else continue with your logic. To begin with create java class like above, add this code snippet and just explore the data.
Now, just curious. If your requirement is really to control the actions based on User Role/Groups, did you try to use the out of box functionality and avoid this custom logic. Say for BPM Applications, we have Swimlanes / Roles. Only users belonging to that Role, can work on that Tasks. Try to use out of box stuff as much as possible, unless you really need custom assignment logic.
Thanks
Ravi Jegga
Just giving the code snippet to get an idea. But do refer the online APIs for more information.
public void validateTaskOperation(ITaskValidationCallback.TaskAction taskAction, IWorkflowContext iWorkflowContext, Task task, Map<String, Object> parameters, Locale locale, List<String> errors) {
try {
  Element taskPayload = task.getPayloadAsElement();
  String taskTitle;
  String taskOutcome;
  SystemAttributesType taskSystemAttributes = task.getSystemAttributes();         
  taskTitle = task.getTitle();
  System.out.println("MyAppTaskValidationCallback::validateTaskOperation() Begin For TaskTitle: " + taskTitle + " -> TaskAction: " + taskAction + " -> Parameters:\n" + parameters);
  if(taskAction == TaskAction.ACQUIRE) {
      System.out.println("Inside ACQUIRE");
      //parameters.put("AcquiredBy", iWorkflowContext.getUser());
  } else if(taskAction == TaskAction.OUTCOME_UPDATE) {
    System.out.println("Inside OUTCOME_UPDATE");
} catch (Exception anException) {
  anException.printStackTrace();
}