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EMF/CDO 1.0/New and Noteworthy

< EMF

CDO 1.0 (available as part of Ganymede and also separately on the EMF site) contains a number of important and long-awaited features, changes, and enhancements.

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
  • 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, 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


Hibernate Store Features


More information

The CDO project uses dynamically-generated release notes, using Bugzilla and CVS data to create accurate lists of bugs closed in each build. This also allows developers and users to see what files were changed for each bug, by who, and when. For details on how this is done, see Parameter List.