After more than a decade of research into and practical application of service-orientation (SO*) there is still confusion about what services are, and what their benefit to Software Engineering research and practice is. Nevertheless, and unfazed by its fuzzy backdrop, SO* has taken hold across industry as the foundation on which large software systems are built. Clearly, this leaves many fundamental questions on the table. This paper focuses on developing the principles and practices for using SO* in large-scale service integration. We start from a simple premise: services are functions, service-oriented architectures (SOAs) are dynamic functional programs. We develop this premise into a semantic foundation for services and SOAs based on a novel dynamic model of stream processing functions. We introduce Open Rich Services (ORS), an architecture pattern for SOA that (a) disentangles infrastructure-concerns cleanly from application-specific concerns, (b) supports flexible and dynamically changeable service composition, and (c) facilitates hierarchical service decomposition. We establish the link between ORS and our basic SOA semantics to yield a comprehensive and scalable SOA foundation. As a proof of concept we develop a domain specific language (DSL) for specification of SOAs following this semantic approach.

Pre-2018 CSE ID: CS2012-0982

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Requirements relationships express conceptual dependencies, constraints and associations among the requirements of a software system, such as dependencies and hint-relations. For stakeholders of a system, it is important and beneficial to identify requirements relationships for system design, maintenance and comprehension tasks. In this paper, we build on existing research and use features, realization of functional requirements in software, to automatically retrieve requirements relationships from existing test cases. We evaluate our approach on a chat system, Apache Pool, and Apache Commons CLI. We obtain precision/recall levels as good as or better than currently existing object-tracing and scenario-analysis based approaches when tested on the same case studies. Furthermore, our approach is resistant to scenario selection, and works for all types of systems with a profiler available, unlike existing techniques.

Pre-2018 CSE ID: CS2013-1001

A cyberinfrastructure (CI) is an Internet-based collection of computing services dedicated to providing data storage, computations, and visualizations to a stakeholder ecosystem. A major CI function is to execute workflows on behalf of stakeholders. Each stakeholder will participate in the CI only if the workflows incorporate certain requirements, which may vary from stakeholder to stakeholder. Additionally, because successful CI use by one stakeholder depends on the results of successful use by other stakeholders, a failure of the CI to enforce stakeholder requirements risks the viability of the entire CI. A critical enabler for CIs is the efficient elicitation of stakeholder requirements, called policies, and their accurate and timely enactment. This paper presents a technique that combines UML Activity Diagrams and a Domain Specific Language (DSL) to enable stakeholders to formulate identity- and environment-based access control policies in the context of a workflow. To demonstrate the technique, we recruited exposure biologists as domain experts interested in inserting access control policies into a workflow in the PALMS CI, a health monitoring system currently used at UC San Diego. We found that not only could the experts successfully formulate their policies, but that translation of these policies to the implementation level was quick and accurate. This work extends work in design-level security engineering techniques (UMLsec and SecureUML), Activity Diagram formalisms, and DSLs. In leveraging workflow visualization, efficient policy articulation, and timely enactment, this technique encourages exploration of the requirement space by domain experts.

Pre-2018 CSE ID: CS2012-0988