Seam: Manual Transaction

1. start a nested conversation and set em flush mode to manual before showing popup.

    @Begin(nested = true, flushMode = FlushModeType.MANUAL)
    public void prepareEdit()  {}

2. when click save button, end conversation and flush em.

    @End
    public void saveEdit() {
       xxxService.update(WhatEverObjectYouAreEditing);
       dbHelperService.flush();

       // If the current object needs to updated on session scope, raise event
      Events.instance().raiseEvent(eventName, WhatEverObjectYouAreEditing)

      // Then the parent action should listen to the eventName, so the object can be reloaded.
     }

3. when click cancel button, end conversation and refresh data

   @End 
   public void cancel() {
     dbHelperService.refresh(WhatEverObjectYouAreEditing);
   } 

Couple of things to remember
1. Conversation vs Transaction
- Transaction is not started when conversation starts
- You can only specify transaction will be maintained manually when conversation starts. (That definition will be cleared when conversation ends)
- Transaction will be committed when you execute.
- When transaction ends, dirty object will be cleared if not commited.

2. Flush vs Commit
- When executing a method, you can flush any time.
- Flush updates database to reflect the changes in objects in memory.
  : However, it is still not committed yet.
  : Unless flushes, database will not see the change.
  
- When the execution ends, transaction will be commited automatically.
- You can run flush, but cannot run commit