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Coordinated Exception Handling in Distributed Object Systems: from Model to System Implementation

Lookup NU author(s): Emeritus Professor Alexander RomanovskyORCiD, Professor Brian RandellORCiD



Exception handling in distributed and concurrent programs is a difficult task though it is often necessary. In many cases traditional mechanisms for sequential programs are no longer appropriate. One major difficulty is that the process of handling an exception may need to involve multiple concurrent components when they are cooperating to solve a global problem. Another complication is that several exceptions may be raised concurrently in different nodes of a distributed environment. Existing proposals and actual concurrent languages either ignore these difficulties or only cope with a limited form of them. This paper attempts a general solution, developed especially for distributed object systems, starting with from conceptual model, together with algorithms (and their correctness proofs) for coordinating concurrent components and resolving multiple exceptions, through to an actual system implementation. An industrial production cell is chosen as a case study to demonstrate the usefulness of the proposed model and algorithms. The supporting system and the resolution mechanism are implemented in distributed Ada 95 and examined through several performance-related experiments.

Publication metadata

Author(s): Xu J, Romanovsky A, Randell B

Publication type: Report

Publication status: Published

Series Title: Department of Computing Science Technical Report Series

Year: 1997

Pages: 26

Report Number: 612

Institution: Department of Computing Science, University of Newcastle upon Tyne

Place Published: Newcastle upon Tyne