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Jackrabbit Branch Development / Integration
In this section I want to summarize the process of the content repository integration.
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- When we have an external content Repository it's easy to connect third party tools to the repository (i.e. CMS Systems)
- If we have a generic JCR implementation we can simply add different content repositories
- Content Repositories allow easier maintenance of complex content structures, as contents are no longer stored in different tables (Content, Resource, ElectronicText ...).
- Content Repositories can provide revisioning of contents and content modifications
What has been done
- Created a new independent JCR module in the framework
- Start the Jackrabbit Container on ofbiz startup
- Created a Repository Factory
- Created a Jackrabbit - Ofbiz architecture proposal:
- (Implementation of the proposal is done and will be committed after review) done @Rev: *1094250:
- * You can create new repository nodes
* Nodes are represented in a tree structure
* Nodes can store Text (Text, HTML, FTL ....) and File content
* There is a separate tree to store files and text content because the repository don't allow to mix them up, but this absolutely transparent for the user
* Each new node is linked to a content entity
* The link in the content entity can be used for maintainable reasons (permission checks, user specific content, content status etc.)
* Everything can be tested under Examples --> Jackrabbit Sandbox
- * You can create new repository nodes
- Jackrabbit Node Structure for (i18n) text content and files:
- JCR contents and nodes are always be revisioned
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- Code refactoring, now using Jackrabbit OCM (ObjectContentMapping) to store Content Objects in the repository. Which makes it much easier to store different content objects, and we are flexible to add as much content fields, information as we want.
- New Class Diagramm:
Ofbiz Jackrabbit architecture description
In the next few lines I would like to describe the architecture diagram and explain why I chose this way to integrate Jackrabbit in OFBiz.
The design is based on the Jackrabbit OCM (ObjectContentMapping) Package which gives us the ability to map objects to the content repository. Choosing this approach makes us more flexible to use different types of content. I.e. it’s possible to create different Content Objects with specific fields for blogs, forums, Products, Files, partys and so on.
In the current release I avoid any connections to the database, that makes the implementation absolute independent from the application site.
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Framework side – An interface to JCR implementations and the example implementation
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The Framework provides interfaces which should be implemented to make a JCR repository available in OFBiz. Furthermore the JCR reference implementation Jackrabbit can be found in the framework.
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org.ofbiz.jcr.access
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This package contains interfaces to connect to the Jackrabbit OCM.
The RepositoryAccess class creates the OCM connection and provides methods for CRUD operations. The CRUD operations are defined in the ContentWriter and ContentReader classes.
The VersionManager is responsible for all versioning related operations and is used by the ContentReader/Writer to grant access to versioned nodes.
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org.ofbiz.jcr.orm
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The ORM (OfbizRepositoryMapping) package is the OFBiz abstraction of the content objects. The OfbizRepositoryMapping interface is used by the ContentReader/Writer to interact with the ObjectContentMappingManager.
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org.ofbiz.jcr.loader
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Contains all classes to start the jcr/jackrabbit container, register everything in the JNDI and make sure that all additional namespaces and nodeTypes a registered.
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org.ofbiz.jcr.util
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The util classes contain static methods, which helps to work with the content repository.
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org.ofbiz.jcr.handler
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The repository need an own handler with no overhead, to stream (i.e.) images to a webpage.
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org.ofbiz.jcr.security
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Provide some security functions to control the repository access.
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Application side
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For now there are no application related implementations. It is conceivable that we have a application related content database connection or different Content Workers which provide additional functionality for the specific context.
Still to be done
Ideas
Table of Content
- Initial integration of the Jackrabbit repository - features and architecture description
- Design documents
- Configuration document
- Requirements and Ideas
- Current DB based content implementation vs JCR based content implementation
- Propagate and enforce OfBiz permissions, roles and users to JCR
- Expose the JCR part via WebDAV (and/or some RESTish service)
- JCR contents shall always be revisioned
- Prevent duplication of properties between OfBiz and JCR
- Explore Content Addressable Storage CAS options to prevent duplicate contents
- Use this opportunity to create a simple workflow for OfBiz CMS Contents (or externalize to a CMS that provides a workflow)