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https://issues.apache.org/jira/browse/OPENJPA-885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677197#action_12677197
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Dianne Richards commented on OPENJPA-885:
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The clear(Object) method will use an existing Broker detach method. There are
several differences in behavior between those required for the clear method and
the current detach method. As a result, the default 2.0 behavior will change.
However, compatibility options will be provided to revert to the 1.x behaviors.
The first difference has to do with flush. The current behavior is to flush
before detaching. However, the JPA 2.0 spec specifically says that the current
data will not be persisted. So, this will be the default. The using application
can use the Compatibility setFlushBeforeDetach() method to change this behavior.
With the current detach methods, copies are made of the entities and returned.
Does anybody know why this copy is made? It's not necessary for the new clear
method since it has a void return. We'd like to change the default behavior for
the current detach methods to return the original enties with a state change.
Does anybody know of any impacts this might have? Again, there will be a
compatibility option to change this in special circumstances.
With the current detach methods, the entities still remain in the persistent
context. However, for the new clear method, the specified entities must be
removed. I assume the impact will be in performance. As with the previous 2
differences, a compatibility option will be provided.
The last difference deals with cascading. The current detach behavior does a
complete cascade. The clear method requires the cascade to be explicitely
specified. Does anyone see a need for providing a compatibility option for this
also?
> Support clear methods on EntityManager, including new CascadeType.CLEAR
> ------------------------------------------------------------------------
>
> Key: OPENJPA-885
> URL: https://issues.apache.org/jira/browse/OPENJPA-885
> Project: OpenJPA
> Issue Type: Sub-task
> Affects Versions: 2.0.0
> Reporter: Dianne Richards
> Assignee: Dianne Richards
> Fix For: 2.0.0
>
> Attachments: patch.txt
>
>
> Support the 2.0 new EntityManager clear() methods. Also support the new
> CascadeType.CLEAR.
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