C2KLocalObject

Every persistent object that can be stored in the context of an item implements the interface C2KLocalObject (historically representing 'CRISTAL 2 Kernel Local Object'). They must be serializable to XML using CASTOR for storage and transmission. They are identified by a Name, and declare which ClusterStorage type they implement. Not all C2KLocalObjects are stored explicitly in Item Clusters, but are instead only store in Outcomes. These objects return null as their cluster type.

Features:

• Marshalling as XML and unmarshalling from XML back to the original object using a CastorXMLUtility. Mapfiles can be supplied for use in modules in object storage in Outcomes.
• Persistency. All objects handled by the ClusterStorageManager.
• Data transmission. Returned by:
  • queryData method of Item
  • getObject method of ItemProxy
  • EntityProxyObserver subscriptions.

Kernel C2KLocalObjects

Aside from its SystemKey and DomainPaths, all Item and Agent structure and function are held in C2KLocalObjects. This is a key feature of their described nature.

Item

• Property
• Collection
• Workflow
• Event
• Outcome
• Viewpoint

Agent

• Job

Description objects using C2KLocalObject

• ElementaryActivityDef
• CompositeActivityDef
• CollectionDescription

C2KLocalObject is also implemented by RemoteMap, so that it can be returned by the ClusterStorageManager to provide History and JobList objects.