Implementing interposition in CORBA Object Transaction Service

One of the most important CORBA services defined by the OMG is the Object Transaction Service (OTS) which augments the CORBA object model with the notion of distributed transactions. The implementation design of the OTS is critical for the service to be really effective for applications. A good design suggests that the OTS should be part of the ORB (object request broker) itself rather than on top of it like normal CORBA objects. In this paper, we highlight the design implementation of the OTS within the Orbix product and describe how the interposition of transaction objects can be achieved by exploiting the hooks provided by the underlying ORB