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OSGi is a popular Java-based platform, which has its roots in the area of embedded systems. However, nowadays it is used more and more in enterprise systems. To fit this new application area, OSGi has recently been extended with the Remote Services specification. This specification enables distribution, which OSGi was previously lacking. However, the specification provides means for synchronous communication only and leaves out asynchronous communication. As an attempt to fill a gap in this field, we propose, implement and evaluate an approach for the integration of asynchronous messaging into OSGi.
We propose an Activity Service as a component in cloud computing. As a particular novelty we base this Activity Service on the well-defined and proven semantics of Active Database Management Systems (ADBMS) to overcome the challenges of developing portable cloud based event processing applications. As contribution of this paper we provide the first steps of the adaption of the ADBMS semantics to the distributed and highly dynamic environment of the cloud.
The paper presents the OM4SPACE project, which aims to provide an integration of active functionality into cloud environments to enable applications to further benefit from the agility of this new environment. In particular, we propose an activity service that incorporates well defined interfaces and the clear semantic of Active Database Management System (Active DBMS) style event processing combined with the concepts of modern Event Driven Architectures and the approach of Complex Event Processing. This gives the potential to provide active functionality across the boundaries of one Cloud and to decouple the usage of active functionality from the concrete cloud provider. In this paper we present our initial prototypic implementation of this activity service.
