Programming with object groups in CORBA

The Object Group Service (OGS) extends CORBA with the ability to gather several objects inside a group and to transparently handle the group membership and the consistent invocations of the group members. OGS does not require any change to the CORBA specification: it is portable on any CORBA 2.0 ORB and does not rely on ORB vendorspecific features. We present the OGS programming model and we discuss various levels of group transparency and their impact on invocation overheads.