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ThinkMind // International Journal On Advances in Networks and Services, volume 8, numbers 3 and 4, 2015 // View article netser_v8_n34_2015_7


Deriving Robust Distributed Business Processes with Automated Transformations of Fallible Component Processes

Authors:
Lei Wang
Luis Pires
Marten van Sinderen
Andreas Wombacher
Chi-Hung Chi

Keywords: robust; collaborative processes; control flow; WSBPEL; interactions; system crash; network failure; automata

Abstract:
Due to the possibility of system crashes and network failures, the design of robust interactions for collaborative business processes is a challenge. If a process changes state, it sends messages to other relevant processes to inform them about this change. However, server crashes and network failures may result in a loss of messages. In this case, the state change is performed by only one process, resulting in global state/behavior inconsistencies and possibly deadlocks. Our idea to solve this problem is to (automatically) transform the original processes into their robust counterparts. The robust initiator process re-tries failed interactions by resending the request message. The robust responder then replies with the possibly lost response message, without processing the request again. We illustrate our solution using a subset of Web Services Business Process Execution Language (WS-BPEL). A WS-BPEL process is modeled using a so called Nested Word Automata (NWA), to which we apply our transformation solution and on which we perform correctness proof. We have also analyzed the performance of our prototype implementation. In our previous work, we assumed that a certain pre-defined interaction follows the failed interaction. In this work, we lift this limitation by allowing an arbitrary behavior to follow the failed interaction, making our solution more generally applicable. This paper is an extension of our previous paper. The additional contents of this paper is the following.

Pages: 192 to 202

Copyright: Copyright (c) to authors, 2015. Used with permission.

Publication date: December 30, 2015

Published in: journal

ISSN: 1942-2644

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