topic CDI: Howto 'pause' an user task with flush of variables in Alfresco Archive

CDI: Howto 'pause' an user task with flush of variables

chris_joelly — Sun, 20 May 2012 20:51:16 GMT

Hello,on a JSF mask i use <f:event type="preRenderView" listener="#{businessProcess.startTask(taskId, true)}" />‍‍‍to start the user task and <h:commandButton action="#{businessProcess.completeTask(true)}" value="Complete" />‍‍‍to complete the user task. I now want to add a button where

Re: CDI: Howto 'pause' an user task with flush of variables

rogerofyan — Mon, 21 May 2012 08:28:33 GMT

I think a user task is paused by default, since task is of 'block' element, which will block the process execution until you implicity push it ahead.
You can store variables with taskService after you starting a task, and retrieve it back anytime later.

Re: CDI: Howto 'pause' an user task with flush of variables

chris_joelly — Mon, 21 May 2012 12:05:21 GMT

yes, storing the variables using the TaskService is possible, but as the businessProcess.startTask and businessProcess.completeTask create a scope and association of the execution to the scope (i think Conversation scope) this scope needs to be closed and the association removed as well.

Re: CDI: Howto 'pause' an user task with flush of variables

meyerd — Thu, 24 May 2012 06:33:36 GMT

Hi Chris,

The following should work:

public class Controller {

 @Inject
 private BusinessProcessAssociationManager associationManager;
 
 @Inject 
 private TaskService taskService;
 
 public void pauseUserTask() {
  Task task = associationManager.getTask();
  if(task == null) {
   throw new RuntimeException("Not working on a task");
  }
  // flush the variables
  Map<String, Object> changedVariables = associationManager.getBeanStore().getAllAndClear();
  if(changedVariables.size()>0) {
   taskService.setVariables(task.getId(), changedVariables);
  }
  // remove the association with the current task. 
  associationManager.disAssociate();
 }
 
}

Re: CDI: Howto 'pause' an user task with flush of variables

chris_joelly — Sun, 27 May 2012 19:40:56 GMT

Hi Daniel,

thanks for the hint with the associationManager. I already tried to extend the BusinessProcess bean but did not think of using the BusinessProcessAssociationManager.

When i think of the conversation and association:

Is it safe to end an active conversion as well when i pause/suspend an user task?
And when the user does not leave the form and continue his work (within the session timeout of course),
how can i recover from it? I think there should be some kind of resume as well after the pause/suspend?
Or is it better to redirect the user to the task list from which he can work on another task or restart the
"paused" task which then starts a new conversation and association cleanly?

Thanks, Chris

btw: BusinessProcess.startTask(String taskId, boolean beginConversation) ignores the argument beginConversation.