[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2770) Action observers for event listeners

[Steve Ebersole (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=42255#action_42255 ] 

Steve Ebersole commented on HHH-2770:
-------------------------------------

This should be pretty easily doable if you wanted to give it a shot.  We will simply not have time to get this done in 4.0 timeframe ourselves.  I think the best approach is:
# Add a {{org.hibernate.action.spi.ActionObserver}} interface
# Alter {{org.hibernate.engine.spi.ActionQueue}} to:
## hold a collection of {{org.hibernate.action.spi.ActionObserver}} instances
## leverage a {{java.util.ServiceLoader}} to locate {{org.hibernate.action.spi.ActionObserver}} instances (see {{org.hibernate.integrator.internal.IntegratorServiceImpl}} if you need example)
## call the observers for each action ({{org.hibernate.action.spi.Executable}}) in {{org.hibernate.engine.spi.ActionQueue#execute}}

> Action observers for event listeners
> ------------------------------------
>
>                 Key: HHH-2770
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2770
>             Project: Hibernate Core
>          Issue Type: New Feature
>          Components: core
>            Reporter: Christian Bauer
>            Priority: Minor
>
> Talked to Steve about a feature he calls "action observers", which would allow the following use case:
> - Write a FlushEventListener
> - Observer for what has been deleted, inserted, updated (action queues)
> This removes some of the pain that comes from missing communication between listeners. For example, you can easily move code you would traditionally write in an Interceptor into a FlushEventListener if you only need inserted/deleted/udpated records.

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