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programming Language Design for event-driven service Composition

AUTOMATIKA 2010年第4期51卷 374-386页

作者： Srbljic, Sinisa Skvorc, Dejan Skrobo, Daniel Univ Zagreb Sch Elect Engn & Comp Zagreb 10000 Croatia Ericsson Nikola Tesla DD Zagreb 10002 Croatia

To adapt to rapidly changing market conditions and increase the return of investment, today's IT solutions usually combine service-oriented architecture (SOA) and event-driven architecture (EDA) that support reusability, flexibility, and responsiveness of business processes. programming languages for development of event-driven service compositions face several main challenges. First, a language should be based on standard service composition languages to be compatible with SOA-enabling technologies. Second, a language should enable seamless integration of services into event-driven workflows. Third, to overcome a knowledge divide, language should enable seamless cooperation between application developers with different skills and knowledge. Since WS-BPEL is widely accepted as standard executable language in SOA, we extended WS-BPEL with support for event-driven workflow coordination. We designed event-handling mechanisms as special-purpose Coopetition services and augmented WS-BPEL with primitives for their invocation. Coopetition services augment SOA with fundamental EDA characteristics: decoupled interactions, many-to-many communication, publish/subscribe messaging, event triggering, and asynchronous operations. To make the application development familiar to wide community of developers, we designed an application-level end-user language on top of WS-BPEL whose primitives for invocation of regular Web services and Coopetition services resemble the constructs of typical scripting and coordination language.

关键词： service composition service-oriented event-driven programming programming language design

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programming Languages for End-User Personalization of Cyber-Physical Systems

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AUTOMATIKA 2012年第3期53卷 294-310页

作者： Srbljic, Sinisa Skvorc, Dejan Popovic, Miroslav Univ Zagreb Fac Elect Engn & Comp Dept Elect Microelect Comp & Intelligent Syst HR-10000 Zagreb Croatia

The increased usage of smart devices and appliances opens new venues to build applications that integrate physical and virtual world into consumer-oriented context-sensitive cyber-physical systems (CPS). Since physical processes are dynamic, concurrent, event-driven, and powered by various sensors, controllers, and actuators, a combination of service-oriented architecture (SOA) and event-driven architecture (EDA) is the most promising software architecture for virtualization of heterogeneous components into interoperable application building blocks. In this paper, we propose a CPS design paradigm where devices, such as sensors, controllers, and actuators, are virtualized into environmental services. To support event-driven workflow coordination, we designed special-purpose coopetition services that provide fundamental EDA characteristics, such as decoupled interactions, many-to-many communication, publish/subscribe messaging, event triggering, and asynchronous operations. Based on these two groups of services, we present a design of event-driven service composition languages that target two distinct groups of developers. Using Python as an example, we present a transformation of arbitrary general-purpose programming language into an event-driven service composition language for developers familiar with parallel programming using operating system kernel mechanisms. On the other hand, we present the design and cognitive evaluation of an end-user language, whose 2D tabular workspace resembles the process of sketching an automation application on a sheet of paper.

关键词： Cyber-physical systems service-oriented event-driven programming Multi-device applications Tabular programming

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