[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3132) Event System With Phased Appraoch

[Anirudh Vyas (JIRA)]

Event System With Phased Appraoch
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                 Key: HHH-3132
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3132
             Project: Hibernate3
          Issue Type: Improvement
          Components: core
    Affects Versions: 3.2.6
         Environment: 3.x
            Reporter: Anirudh Vyas


Hibernate currently lacks proper event Delegation model; 

Granted it has a hook for listeners and iterates through them to find out which is appropriate or not.

But a better way would be to add  "Queuing of events" approach; meaning each event is first queued (for firing) and then Hibernate goes through cycles of phases (it can be internally thought of as a  Phase 1 ---> Phase 2 ---> Phase 3 ). and each phase has a queue of events it has to process. A phase can have corresponding listener to process phases and clear the queue of events associated with it ( meaning events set to "fire" in the currently executing phase).

All event creation should be centralized and all events should be queued through a factory. A flexible approach (ideally) would be to allow users to create Custom phases to enhance lifecycle of their own Application using Hibernate's Phase interface. 

"Phase implementation " could include usage of Enums, but its not mandatory ( so long as we are worried about back-wards compatibility).

As it is, Hibernate Event system is poorly documented and not very well understood.

What do you guys think ?

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