You are required to read and agree to the below before accessing a full-text version of an article in the IDE article repository.
The full-text document you are about to access is subject to national and international copyright laws. In most cases (but not necessarily all) the consequence is that personal use is allowed given that the copyright owner is duly acknowledged and respected. All other use (typically) require an explicit permission (often in writing) by the copyright owner.
For the reports in this repository we specifically note that
- the use of articles under IEEE copyright is governed by the IEEE copyright policy (available at http://www.ieee.org/web/publications/rights/copyrightpolicy.html)
- the use of articles under ACM copyright is governed by the ACM copyright policy (available at http://www.acm.org/pubs/copyright_policy/)
- technical reports and other articles issued by MÃ¤lardalen University is free for personal use. For other use, the explicit consent of the authors is required
- in other cases, please contact the copyright owner for detailed information
By accepting I agree to acknowledge and respect the rights of the copyright owner of the document I am about to access.
If you are in doubt, feel free to contact email@example.com
Licentiate Thesis Seminar - Formal Approaches to Service-Oriented Design: From Behavioral Modeling to Service Analysis
Service-oriented systems (SOS) have recently emerged as context-independent component-based systems. In contrast to components, services can be created, invoked, composed and destroyed at run-time. Services are assumed to be platform independent and available for use within heterogeneous applications. One of the main assets in SOS is service composability. It allows the development of composite services with the main goal of reusable functionality provided by existing services in a low cost and rapid development process on-the-fly. However, in such distributed systems it becomes difficult to guarantee the quality of services (QoS), both in isolation, as well as of the newly created service compositions. Means of checking correctness of service composition can enable optimization w.r.t. the function and resource-usage of composed services, as well as provide a higher degree of QoS assurance of a service composition. To accomplish such goals, we employ model-checking technique for both single and composed services. The verification eventually provides necessary information about QoS, already at early development stage.
This thesis presents the research that we have been carrying out, on developing of methods and tools for specification, modeling, and formal analysis of services and service compositions in SOS. In this work, we first show how to formally check QoS in terms of performance and reliability for formally specified component-based systems (CBS). Next, we outline the commonalities and differences between SOS and CBS. Third, we develop constructs for the formal description of services using the resource-aware timed behavioral language called REMES, including development of language to support service compositions. At last, we show how to check service and service composition (functional, timing and resource-wise) correctness by employing the strongest postcondition semantics. For less complex services and service compositions we choose to prove correctness using Hoare triples and the guarded command language. In case of complex services described as priced timed automata (PTA), we prove correctness via algorithmic computation of strongest postcondition of PTA.Main Supervisor: Prof. Paul Pettersson
Assistant Supervisor: Dr. Cristina Seceleanu
Opponent: Em. Prof. Jonathan Bowen London South Bank University, UK
Examiner: Prof. Björn Lisper, Mälardalen University, Västerås, Sweden