Consistency checking of statechart diagrams of a class hierarchy
ECOOP'05 Proceedings of the 19th European conference on Object-Oriented Programming
Consistency checking of sequence diagrams and statechart diagrams using the π-calculus
IFM'05 Proceedings of the 5th international conference on Integrated Formal Methods
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In this paper, we specify the SET/A protocol which is an agent-based payment protocol for credit card transactions in UML statechart diagrams. Then we translate them into the NuSMV language and analyze the payment protocol using the NuSMV model checker. Although the payment protocol satisfies desired properties including data integrity and deadlock freedom in the absence of an agent failure, a failure analysis reveals that not all desired properties are satisfied when the agent crashes. The agent may fail while it is travelling to a merchantýs server or when it is running in the merchantýs server. To ensure that a transaction is resilient to the agent failure, an extended SET/A protocol is proposed. Whenever a timeout occurs, the cardholder sends an inquiry request to the merchant directly for finding out the transaction result. Our work contributes the e-commerce field by using an integrated approach for modelling and analyzing the SET/A protocol.