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JCR Management
Contents
JCR Mangement (JCRM)
JCR Management will provide tooling and a JCR (http://en.wikipedia.org/wiki/Content_repository_API_for_Java) persistence framework for EMF with pluggable JCR implementations.
The Contributions
- My employer inovex GmbH (http://www.inovex.de) contributes 7 person days where I can work on this project within working hours.
- Ed Merks:
- helps as a mentor for questions regarding the Eclipse foundation.
- implemented a new feature request for EMF that I had (dynamic feature delegation)
- answers a lot of my questions in the newsgroup
- The ATL team contributed an initial meta model and transformation that will speed up ATL integration.
- Nick Boldt created the initial JCR Management (CVS, website, ...) setup at eclipse.org
The Status
JCRM is not production ready at the moment. The current code base consists of prototypes that serve as a basis for concrete discussions about requirements and solutions.
The Tooling
EMF Class Editor
The class editor is based on the EMF Ecore model. This model is generated from the node types in the repository.
Jackrabbit XML Nodetype Editor
This editor can be generated from a usual EMF model. It can be used to register an EMF model as node types.
Jackrabbit CND Editor
This model is generated from the node types in the repository. It contains validation checks and a minimal code completion. It is based on oAW's XText which provides way more features for such editors than I currently use.
Domain Model Editor
This is the editor that EMF generates but it is backed by a repository. Every change in the model immediately changes the underlaying repository. E.g. if you add a "Book" object in that editor node.addNode("NewNode","Book") is called. As soon as you save the editor session.save() is called.
Tasks
- See Bugzilla for an overview of the ToDo's https://bugs.eclipse.org/bugs/buglist.cgi?short_desc_type=allwordssubstr&short_desc=&product=EMFT&component=JCR+Management&long_desc_type=allwordssubstr&long_desc=&order=Importance
Next Milestone
Create a first downloadable presentation of the project to show the potential of Eclipse modeling to the Jackrabbit community.
Ideas
- Using Cedrics Compare editor inside the JCR Manager
Values
- simplicity
- transparency
- no dependency on JCR implementations
FAQ
- What's the relationship between JCR Management and Jackrabbit JCR-OCM?
One part of JCR Management has the same goal as JCR-OCM - exposing node data and operations to domain models - but JCRM uses an MDSD approach based on Eclipse Modeling Framework (EMF). This makes it depending less on reflection and using more generated classes instead. It will delegate as many calls on JCR node data as possible to minimize copying node data to domain model objects. Additionally JCR Management also has many other goals. But find out the details of JCR-OCM and check out the source code and the documentation.
CVS Access
Some important things are now checked in. Third party jars are not yet checked in as the IP for Jackrabbit needs to be reviewed by Eclipse. Please use the plugin id's as project names ("org.eclipse.emf.jcrm.metamodel" and "org.eclipse.emf.jcrm.model")
CVS Repository Connection
- Server: dev.eclipse.org
- Repository Path: /cvsroot/modeling
- User: anonymous
- Password: (leave blank)
- Connection Type: pserver
- Checkout As: Empty EMF Project
Modules
- You can check out the plugins in the org.eclipse.emf/org.eclipse.emf.jcrm/plugins folder as CVS modules