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Second USENIX Conference on Object-Oriented Technologies (COOTS), 1996
The Object Group Design Pattern
Silvano Maffeis
Olsen & Associates
Zurich, Switzerland
Abstract
This paper describes "Object Group", an object behavioral pattern for
group communication and fault-tolerance in distributed systems. The
Object Group pattern supports the implementation of replicated
objects, of load sharing, and of efficient multicast communication
over protocols such as IP-multicast or UDP-broadcast. Application
areas of the pattern are fault-tolerant client/server systems,
groupware and parallel text retrieval engines. Events within an Object
Group honor the Virtual Synchrony model. With Virtual Synchrony, the
size of an object group can be varied at run-time while client
applications are interacting with the group. A replicated state
remains consistent in spite of objects entering and leaving the group
dynamically and in spite of failures. The Object Group pattern has
been implemented in the Electra and in the Orbix+Isis CORBA Object
Request Broker.
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