|
Description:
|
Investigate
Introduce {{org.hibernate.engine.internal.EntityEntryContext}}, {{org.hibernate.engine.spi.ManagedEntity}}, etc as a means to allow increased performance for Session-related memory and CPU overheads.
{{org.hibernate.engine.internal.EntityEntryContext}} is a context for maintaining the relation between an entity associated with the Session owning this {{EntityEntryContext}} and that entity's corresponding {{org.hibernate.engine.spi.ManagedEntity}} reference.
{{org.hibernate.engine.spi.ManagedEntity}} is a contract for describing an entity's association with a Session. It gives us access to information (specific to each entity instance) such as it's {{org.hibernate.engine.spi.EntityEntry}} as well as defining a doubly-linked graph via {{org.hibernate.engine.spi.ManagedEntity#$$_hibernate_getPreviousManagedEntity}} and {{org.hibernate.engine.spi.ManagedEntity#$$_hibernate_getNextManagedEntity}}
There are 2 forms of {{org.hibernate.engine.spi.ManagedEntity}} supported. First is for the entity to implement the {{ManagedEntity}} interface, either directly or through bytecode manipulation. Second is for Hibernate to "wrap" the entity in a {{ManagedEntity}} implementation (legacy Hibernate did this anyway, in terms of wrapping the entity as it was added to {{IdentityMap}}).
An Ant task to perform enhancing was added here as well. Gradle and Maven support are tagged in HHH-8306 and HHH-8337, respectively.
See HHH-7963 for follow-on tasks...
----
Initially, this issue started as an investigation into
expanding bytecode enhancement support to cover a variety of topics such as
* removing load (
{{
EntityEntry
}}
, etc) from
{{
PersistenceContext
}}
- important in removing reliance on
{{
IdentityMap
}}
and reducing Session-related memory and CPU overheads
* dirtiness handling
* lazy initialization - both through interception and through generated "proxies" (generated class)
* bi-directional association management
* anything else?
The first bullet above is the feature implemented here. The other bullets have all moved to HHH-7963 and its sub-tasks.
|
