[hibernate-issues] [Hibernate-JIRA] Commented: (EJB-360) Create a property to intercept the Configuration for programmatic modification before the EntityManagerFactory is created

[payne (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/EJB-360?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=31282#action_31282 ] 

payne commented on EJB-360:
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> Create a property to intercept the Configuration for programmatic modification before the EntityManagerFactory is created
> -------------------------------------------------------------------------------------------------------------------------
>
>                 Key: EJB-360
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/EJB-360
>             Project: Hibernate Entity Manager
>          Issue Type: New Feature
>          Components: EntityManager
>    Affects Versions: 3.3.2.GA
>            Reporter: John Leach
>         Attachments: ConfigurationCustomizer.patch
>
>   Original Estimate: 1 hour
>  Remaining Estimate: 1 hour
>
> Create a property (hibernate.cfg.customizer) in persistence.xml which allows the user to specify a class which can programmatically modify the constructed Configuration object (built via annotations and XML configuration) before the EntityManagerFactory is created.
> The aim is to provide a third mechanism for configuration, after annotation and XML configuration has been performed. By specifying a user supplied class name the user can then use Configuration methods to access the mappings and make programmatic modifications, such as converting Cascade.ALL (JPA) to cascade all-delete-orphans (Hibernate).
> The attached patch provides the code modifications, currently used in Spikes, (http://lab.jugtorino.it/trac/sandbox/wiki/Spikes) to allow programmatic modifications of the Configuration object. The patch file was created from the current trunk (18/05/2008) of hibernate-entitymanager, more specifically, trunk/src/java/org/hibernate/ejb.
> The user supplied class must have a no argument constructor, and implement the org.hibernate.ejb.ConfigurationCustomizer interface.
> The mechanism is similar to hibernate.ejb.interceptor in concept, except that it acts on the Configuration object rather than on the entity life cycle.

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