[ http://jira.andromda.org/browse/HIB-59?page=history ]
Wouter Zoons reassigned HIB-59:
-------------------------------
Assign To: Wouter Zoons (was: Martin West)
> Java object identity
> --------------------
>
> Key: HIB-59
> URL: http://jira.andromda.org/browse/HIB-59
> Project: Hibernate Cartridge
> Type: Improvement
> Versions: 3.0M3
> Reporter: David Allen
> Assignee: Wouter Zoons
> Priority: Minor
> Fix For: 3.0RC1
>
> Since some of the implementation classes are now placed under the target/src
> directory, it would be nice to automatically produce the equals()/hashCode()
> methods to handle object identity in Java. For a good, concise description,
> see section 4.3 of the Hibernate Reference docs at
> http://www.hibernate.org/hib_docs/reference/en/html/persistent-classes.html#persistent-classes-equalshashcode.
> Depending on the model and how an entity is used, there will be cases where
> some subset of attributes, including a subset of 1, may be used to uniquely
> identify the object between Hibernate sessions in collections. For reasons
> described in the Hibernate reference above, this often cannot be the primary
> key (auto-generated) of the entity, but must be some business key that is at
> least relevant within the context that the entity will be used.
> Generating the methods in the *Impl classes can be fairly straightforward.
> The only design decision to make here is how to let the modeller define which
> subset of attributes on an entity define a business key. Possibilities
> include:
> 1. A new stereotype, like <<primaryKey>>, but for business key attributes,
> 2. A tagged value to add to such attributes (similar to ones for
> "indexed", "unique")
> This only affects the *Impl classes, or perhaps it should really be in the
> main class, since the Hibernate engine does not need it. Within a single
> Hibernate session, the cache takes care of these issues. Only outside of a
> session, or between sessions, does the object identity become an issue.
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