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E. Shokri, K. Tso, R. Dziegel, "Development of Software Fault-Tolerant Applications
with Ada95 Object-Oriented Support", The National Aerospace and Electronics Conference,
Dayton, Ohio, May, 1996
Experience has shown that the current software engineering practice is inadequate
for producing error-free software. Thus, software fault tolerance (SWFT) must be
employed in developing complex safety-critical applications. However, developing
applications which are capable of tolerating software errors is a challenging task
because the developers have to conquer not only the complexity of the application
but also the complexity of fault tolerance protocols. A middleware which provides
SWFT services and establishes a well-de ned interface with the application modules
will allow the application developer to focus solely on the application complexity.
This paper presents such a middleware consisting of reusable SWFT components. It
also explores the way these components interface with the application in order to
tolerate faults in the application. The paper also reports our experience on using
real-time and object-oriented features of the new standard of Ada (Ada95) for implementing
the middleware.
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