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From "Andrzej Bialecki (JIRA)" <j...@apache.org>
Subject [jira] Commented: (GORA-12) Semantics of DataStore.delete*
Date Fri, 05 Nov 2010 16:38:42 GMT

    [ https://issues.apache.org/jira/browse/GORA-12?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928668#action_12928668
] 

Andrzej Bialecki  commented on GORA-12:
---------------------------------------

Sure. This is mostly a doc change, and a change in unit tests - I didn't modify any stores
yet.

> Semantics of DataStore.delete*
> ------------------------------
>
>                 Key: GORA-12
>                 URL: https://issues.apache.org/jira/browse/GORA-12
>             Project: Gora
>          Issue Type: Bug
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
>         Attachments: GORA-12.patch
>
>
> Behavior of delete* calls in DataStore is insufficiently defined. Some unit tests in
DataStoreUtil seem to indicate that after a successful call to delete the subsequent queries
should not return deleted items. Other tests indicate that an additional DataStore.flush()
call is needed.
> If we could rely on the latter assumption this would allow for some important optimizations
in the implementations of DataStore - bulk updates that are visible only after an update transaction
is finished are usually much less expensive to perform than equivalent multiple item by item
transactions.
> Therefore I propose to strengthen the meaning of delete* calls, so that their effects
are guaranteed to be visible to get/execute ONLY after a subsequent flush() call.

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