Orca
Orca is a language based on a useful set of primitives for sharing of data among processes.
The Orca system is a hierarchically structured set of abstractions.
- At the lowest level, reliable broadcast is the basic primitive so that writes to a replicated structure can rapidly take effect throughout a system.
- At the next level of abstraction, shared data are encapsulated in passive objects that are replicated throughout the system.
On these levels, Orca itself provides an object-based language to create and manage objects.