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Modern cloud services and machine-to-machine (M2M) systems provide various kinds of data via various Web services. Implementing context-aware services integrating such global data are promising in various applications. However, it has been challenging to manage heterogeneous contexts and services defined in various Web services. To cope with this, we design a framework, called RuCAS, which systematically manages every context-aware service in form of ECA (EventCondition-Action) rule. We also develop RuCAS platform, which publishes API of RuCAS as Web service. Using the RuCAS platform, users can define their own contexts with various Web services (e.g., information service, sensor services, networked appliances, etc.). Based on the defined contexts, they can create ECA rules to define custom contextaware services. To support users, We also implement a GUI front-end of RuCAS platform, called RuCAS.me. Ru-CAS.me supports users even if the users are non-expert. A case study in a real home network system demonstrates practical feasibility of RuCAS platform and RuCAS.me. The contribution of this paper is to provide design and implementation details of RuCAS, by which one can fully understand systematic management of context-aware services with Web services.

With the spread of Machine-to-Machine (M2M) systems and cloud services, various kinds of data are available through Web services. A context-aware service recognizes a real-world context from such data and behaves autonomously based on the context. However, it has been challenging to manage contexts and services defined on the heterogeneous and distributed Web services. In this paper, we propose a framework, called RuCAS, which systematically creates and manages context-aware service using various Web services (e.g. information services, sensor services, networked appliances, etc.). The framework describes every context-aware service by an ECA (Event-Condition-Action) rule. For this, an event is a context triggering the service, a condition is a set of contexts to be satisfied for execution, and the action is a set of Web services to be executed by the service. Thus, every context-aware service is simply managed in a uniform manner. Since the RuCAS is published as a Web service, it is easy for various applications to reuse and integrate created contexts and services. As a case study, RuCAS is applied to creating context-aware services in a real home network system.

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