Difference between revisions of "CDO"
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[[#Server Side Features|Server Side]]<br> | [[#Server Side Features|Server Side]]<br> | ||
[[#DB Store Features|DB Store]]<br> | [[#DB Store Features|DB Store]]<br> | ||
| − | [[CDO_Hibernate_Store|CDO Hibernate Store description and tutorials]]br> | + | [[CDO_Hibernate_Store|CDO Hibernate Store description and tutorials]]<br> |
[[New And Noteworthy for CDO 2.0]]<br> | [[New And Noteworthy for CDO 2.0]]<br> | ||
[[CDO Explorer (work in progress)]]<br> | [[CDO Explorer (work in progress)]]<br> | ||
Revision as of 20:19, 20 January 2010
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The CDO (Connected Data Objects) Model Repository is a distributed shared model framework for EMF models and meta models. CDO is also a model runtime environment with a focus on orthogonal aspects like model scalability, transactionality, persistence, distribution, queries and more. CDO has a 3-tier architecture supporting EMF-based client applications, featuring a central model repository server and leveraging different types of pluggable data storage back-ends like relational databases, object databases and file systems. The default client/server communication protocol is implemented with the Net4j Signalling Platform. |
Model Integration Features
- EMF integration at model level (as opposed to the edit level)
- Supported model types:
- Generated models (just switch two .genmodel properties)
- Dynamic models (just load .ecore file and commit to repository)
- Legacy models (for compiled models without access to .genmodel)
- Ecore meta meta model and descendants
User Interface Features
- Eclipse view for working with CDO sessions, transactions, views and resources
- Package Manager dialog per session
- Eclipse editor for working with resources and objects
Client Side Features
- Multiple sessions to multiple repositories on multiple servers
- Multiple transactions per session
- Multiple read-only views per session
- Multiple audit views per session (an audit is a view that shows a consistent, historical version of a repository)
- Multiple resources per view (a view is always associated with its own EMF ResourceSet)
- Inter-resource proxy resolution
- Multiple root objects per resource
- Object state shared among all views of a session
- Object graph internally unconnected (unused parts of the graph can easily be reclaimed by the garbage collector)
- Only new and modified objects committed in a transaction
- Transactions can span multiple resources
- Demand loading of objects (resources are populated as they are navigated)
- Partial loading of collections (chunk size can be configured per session)
- Adaptable pre-fetching of objects (different intelligent usage analyzers are available)
- Asynchronous object invalidation (optional)
- Clean API to work with sessions, views, transactions and objects
- CDOResources are EObjects as well
- Objects carry meta information like id, state, version and life span
- Support for OSGi environments (headless, Eclipse RCP, ...)
- Support for standalone applications (non-OSGi)
Network Protocol Features
- Net4j based binary application protocol
- Pluggable transport layer (shipped with NIO socket transport, polling HTTP and JVM embedded transport)
- Pluggable fail over support
- Pluggable authentication (shipped with challenge/response negotiation)
- Multiple acceptors per server
Server Side Features
- Pluggable storage adapters
- See DB Store Features
- See Hibernate Store Features
- Objectivity support coming soon
- Native memory storage adapter
- Multiple repositories per server
- Multiple models (packages) per repository
- Multiple resources (instance documents) per repository
- Expressive XML configuration file
- Configurable storage adapter per repository (see below)
- Configurable caching per repository
- Clean API to work with repositories, sessions, views, transactions and revisions
- Support for OSGi environments (usually headless)
- Support for standalone applications (non-OSGi)
DB Store Features
- Supports all optional features of the CDO Server
- Pluggable SQL dialect adapters
- Includes support for Derby, H2, HSQLDB, MySQL and Oracle (TBD)
- Pluggable mapping strategies
- Includes horizontal mapping strategy (one table per concrete class)
- Includes vertical mapping strategy (TBD, one table per class in hierarchy)
- Supports different mapping modes for collections
- Various mapping options by using EAnnotation