[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-5500) Extend AuditReader interface with findRevisions() method

[Erik-Berndt Scheper (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-5500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=38176#action_38176 ] 

Erik-Berndt Scheper commented on HHH-5500:
------------------------------------------

I propose to add the following extra method

{code:title=org.hibernate.envers.AuditReader.java|borderStyle=solid}

/**
  * Find the entities with a certain primary key, at the given revisions.
  * @param cls Class of the entity.
  * @param primaryKey Primary key of the entity.
  * @param revisions Revision numbers for which to get the entity.
  * @return A map containing the revision numbers and the entity instance at this revision
  * @throws IllegalArgumentException If cls or primaryKey is null or revision is less or equal to 0.
  * @throws NotAuditedException When entities of the given class are not audited.
  * @throws IllegalStateException If the associated entity manager is closed.
  */
<T> Map<Number, T> findEntities(Class<T> cls, Object primaryKey, Set<Number> revisions) throws IllegalArgumentException, NotAuditedException, IllegalStateException;
{code}

However, I believe this query is only feasible after HHH-5372 (improve Envers query performance by using new REVEND column) is implemented in trunk, and subqueries are no longer needed (using the ValidAuditTimeStrategy).

> Extend AuditReader interface with findRevisions() method
> --------------------------------------------------------
>
>                 Key: HHH-5500
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5500
>             Project: Hibernate Core
>          Issue Type: Sub-task
>          Components: envers
>            Reporter: Erik-Berndt Scheper
>
> To improve performance, it would be benificial to extend the Envers AuditReader interface, so that a list of audited entities can be retrieved in one query.

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