[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3614) Version Tagging

[Corneil du Plessis (JIRA)]

Version Tagging
---------------

                 Key: HHH-3614
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3614
             Project: Hibernate Core
          Issue Type: New Feature
          Components: envers
            Reporter: Corneil du Plessis


I would like to suggest a new feature for version tagging in envers.
I have a suggestion for how it can be implemented.

@Versioned
@Taggable
public class MyEntity {
     @Id
    private Long id;
    @Basic
    String someProp;
}

By implication results in @RevisionTagEntity which can be seen as
public class MyEntity_tag {
    @RevisionNumber
    private Integer version_numer;
    @RevisionTagTimestamp
    private long tag_date;
    @RevisionTagValue
    private String tag; // Other @Colum can apply as well as using Integer or Enum 
   // Other properties allow like with @RevisionEntity
}

This produces a table like:

    create table MyEntity_tags (
        id bigint not null,
        version_number integer not null,      // version_number is _revision
        tag_date timestamp not null, // assigned when create or modified 
        version_tag varchar(255) not null,  // Could be customizable with RevisionTagEntity similar to RevisionEntity
        primary key (id, version_tag),
    );

EntityTagging will be a utility class using EntityManager and Entity or Collection of Entities and do:

tagLatestVersion(Object entity, String tag)
tagVersion(Object entity, Integer version, String tag)
moveTag(Object entity, String targetVersion, String tag)
determineVersion(Object entity, String tag)


The following could be added to allow the retrieval of versions of collections of entities that are tagged in a specific way.
RevisionProperty.tag(String tag)


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