[CAY-682] Generic Cayenne POJO enhancer

• Type: Task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0
• Fix Version/s: 3.0
• Component/s: Core Library
• Assignee: Andrus Adamchik
• Reporter: Andrus Adamchik
• Created: 10/Oct/06 04:07
• Updated: 02/Sep/07 10:16
• Resolved: 02/Sep/07 10:16

Description

JPA implies POJO persistence, so to hook up pojos to Cayenne we need an enhancer.

However it looks like the enhancer itself doesn't have to know anything about JPA - it can be built on top of Cayenne. I prototyped an ASM-based enhancer [1] that turns a POJO into a Persistent instance and also does property interception. It is much cleaner and intuitive than our current CGLIB JPA enhancer, and (again) - it does not depend on anything JPA.

The next steps I am going to take:

• move it to Cayenne core,
• create more tests
• switch JPA to the new enhancer
• add support for relationships interception

So we will support POJO's without JPA! (and without spending any extra time in addition to what was planned for JPA work).

[1] https://svn.apache.org/repos/asf/incubator/cayenne/sandbox/asm-enhancer/

Issue Links

• relates to: CAY-694 Support for serialization of enhanced serializable POJO's that do not declare 'serialVersionUID'
• relates to: CAY-684 Turn cayenne-jpa-agent into cayenne-agent
• relates to: CAY-686 Weed out DataObject references from the access stack classes, replacing them with Persistent and ClassDescriptor
• relates to: CAY-689 DataObjectUtils must return "Object" instead of "DataObject" from all pk lookup methods
• relates to: CAY-692 Extra argument needed in ObjectContext.prepareForAccess - whether the property is a fault or not.
• relates to: CAY-688 Change signatures of ObjectContext.deleteObject/registerNewObject/localObject to take Object instead of Persistent as an argument