Dynamic object process graphs

Today model checking of Web Services formulated in BPEL is often reduced by transforming BPEL-processes to Petri nets. These can be model checked using traditional approaches. If recursion is present in the BPEL model this approach hides some possible violations of the wished behaviour. We present an approach which allows the Web Service developer to formulate more properties of the required usage of the Web Service and provide a tool that checks whether these requirements are satisfied in a Web Service based system. We use finite state machines to specify permitted sequences of receivable interactions and call them service protocols. In this paper we will show that it is possible to use BPEL representations and service protocols to check if a sequence of receivable interactions that violates a service protocol can occur. We achieve this result by translating BPEL to Process Algebra Nets (introduced by Mayr ) and applying the approach of Mayr for model checking Process Algebra Nets. Our approach computes counterexamples even for recursive and parallel programs including synchronization.

Automatic Protocol Conformance Checking of Recursive and Parallel BPEL Systems

Today model checking of security or safety properties of component-based systems based on finite protocols has the flaw that either parallel or sequential systems can be checked. Parallel systems can be described often by well known Petri nets, but it is not possible to model recursive behaviour. On the other hand sequential systems based on pushdown automata can capture recursion and recursive callbacks [27], but they do not provide parallel behaviour in general.

In this work we show how this gap can be filled if process rewrite systems (introduced by Mayr [16]) are used to capture the behaviour of components. The protocols of the components interfaces specified as finite state machines can be combined to a system equal to a process rewrite system. By calculating the reachability of the fault state range one gets a trace (counterexample) which does not satisfy the properties specified by all protocols of the combined components, if any error exists.

Automatic Protocol Conformance Checking of Recursive and Parallel Component-Based Systems

We address in this article the description and usage of component protocols viewed as specific services. In addition to inter-component service composition, our Kmelia component model supports vertical structuring mechanisms that allow service composition inside a component. The structuring mechanisms (namely state annotation and transition annotation) are then used to describe protocols which are considered here as component usage guides. These structuring mechanisms are integrated in the support language of our component model and are implemented in our COSTO toolbox. We show how protocol analysis is performed in order to detect some inconsistencies that may be introduced by the component designers.

/pdf/defining-component-protocols-with-service-composition-2wwb9q2exs.pdf

Defining component protocols with service composition: illustration with the Kmelia model

Components or services must often be compliant to organizatorial or legal regulations. Furthermore, they should avoid unwanted behaviour such as abortion of the execution of a service without notification of the client. Violation of both might happen due to unintended uses of services. In general, the intention is specified by contracts. In this work, we consider a special form of contracts: service protocols. These specify for a service legal sequences of operation calls. We propose an approach for checking whether such protocols are obeyed in a service composition. For this, it is necessary to define a conservative abstraction of the behaviour of service-oriented systems and a contract based on interactions (named service protocol) to be verified. In our previous work, we have modelled unbound concurrency, unbound recursion, and synchronization. This article briefly presents the previous results and extends them by exception handling mechanisms. In particular, it takes into account that the execution of service may raise an exception and allows the clients to react on the exception.

On expanding protocol conformance checking to exception handling

We statically check whether each component in a component-based system is used according to its protocol and provide counterexamples if such a check fails. The protocol is given by a finite state machine specifying legal sequences of procedure calls of the interface of a component. The main contribution is that we can deal with call-backs without any restrictions. We achieved this by using context-free grammars instead of finite state machines to describe the use of components.

Automatic checking of component protocols in component-based systems

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Automatic checking of component protocols in component-based systems