EclipseLink Extensions Incubator
This incubator will allow the development of extensions to EclipseLink that illustrate to users how similar extensions can be written.
This incubator is not intended to be a catch-all but to specifically deal with EclipseLink's public extension points allowing common extensions to be shared. Some of these extension points include:
- Database Platforms
- Expression Operators
- Event Listeners
- Query Re-directors
- Server Platforms
- Descriptor policies
Each extension will be maintained in its own project with self contained test cases to illustrate and verify its usage. EclipseLink users can then use these extensions as per their EPL/EDL licensing terms.
Promoting an Extension Project
Over time extensions in this incubator may be migrated into core functionality. The basic criteria for promoting include:
- Committers agree that the functionality is valuable to the user community and there is enough interest among the committers to support the functionality. This will require a vote of the current committers with at least 5 positive votes and no negative votes.
- The functionality in the extension project passes a design review of committers with any issues raised addressed
- There exists reasonable test cases, JavaDoc comments, and usage documentation to simplify its promotion
At that time the associated wiki content will be updated to include migration instructions to upgrade to the shipped implementation.
Database Platform Promotion
For a contributed DatabasePlatform to be included in EclipseLink it should pass some basic tests and provide detailed documentation about what can be expected to work on the contributed database platform.
Basic Tests required for inclusion
- Core SRG
- JPA SRG
Functionality Check List
- JPA LRG - passes full JPA LRG
- Core LRG - passes full Core LRG
- DDL Generation
- Outer Join
- Stored Procedures/Stored Functions usage
- Stored Procedures/Stored Functions generation
- Sequences/Identity fields
- JPA Bulk Update/Delete
- Batch Reading
- Batch Writing
- Pessimistic Locking (wait/no wait)
- Database Operators (EclipseLink Expressions) - operators not supported, additional operators supported
- Any Extended Functionality
Note: If a contributed DatabasePlatform replaces an existing DatabasePlatform, it must have a better success rate in our testing than the existing DatabasePlatform.
We would like to set up a way of building a regression test suite for each database platform that contains just the tests that are expected to pass.
Extension Usage Tracking
Each project in this incubator should have its own bug associated so that users of the extension can add themselves to the cc list and therefore be notified of enhancements and migration of functionality into the project's distributed bundles/JARs. The users copied on an extension incubator bug and votes cast for the bug will be used to help judge the community interest in a given project.
Support for Extensions
The support for these extension incubator projects is limited. It is recommended that issues encountered be raised in the bug.
The following are the current extension projects maintained in this incubator.
|Bug||Committers||Description||Comments or Wiki link|
|bug 273057||Nested Fetch Group||dclarke||Extended FetchGroup implementation supporting specifying a FetchGroup for related objects where the relationships are LAZY. details|
|bug 288307||Fetch Plan||dclarke, ssmith||Custom query redirector that allows the specification of required related objects that are forced to be loaded before the query result is returned. details|
|bug 288363||GraphInvalidationListener||dclarke||A SessionEventListener that processes query results ensuring that the graph returned does not contain invalid objects. details|
|bug 253682||Ingres Platform||tware|| Custom database platform provided by vendor. details|
|bug 284657||MaxDB Platform||tware|| Custom database platform provided by community member. details|
|bug 215079||H2 Platform||tware|| Custom database platform provided by community member. details|
|bug 248205||DB2 AS400 Platform||tware|| Custom database platform provided by community member. details. |
|bug 287167||NetWeaver Platform||tware|| Custom server platform provided by vendor. details |
|bug 288715||Symfoware Platform||tware|| Custom database platform provided by vendor. details |