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E. Shokri, P. Crane, K. Kim, C. Subbaraman, "Architecture of ROAFTS/Solaris:
A Solaris-Based Middleware for Real-Time Object-Oriented Adaptive Fault Tolerance
Support", 22nd International Computer Software & Applications Conference (COMPSAC
98), Vienna, Austria, August 1998
Middleware implementation of various critical services required by large-scale and
complex real-time applications on top of COTS operating system is currently an approach
of growing interests. Its main goal is to enable significant reduction in the complexity
of application system design and implementation by separating the concerns of the
application designer for the application functionality from the concerns for application-independent
system issues. This paper presents the middleware architecture named the Realtime
Object-oriented Adaptive Fault Tolerance Support (ROAFTS) and a prototype implementation
ROAFTS/Solaris realized on top of both a COTS operating systems, Solaris, and a
COTS CORBAcomplaint ORB, Orbix. ROAFTS supports distributed real-time applications,
each structured as a network of Time-triggered Message-triggered Objects (TMO's),
and the TMO is a major extension of a conventional object for use in hard real-time
applications. The major components of ROAFTS include a TMO support manager for supporting
the execution of TMO's, a generic fault tolerance server, and a network surveillance
manager (NSM) which provides the generic fault tolerance server with fast fault
detection notices. The generic fault tolerance server and the NSM themselves have
been structured as TMO's. A discussion on an effective use of CORBA standards for
moderate-precision real-time applications to run on COTS operating systems is also
presented.
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