JXTA: A Network Programming Environment
IEEE Internet Computing
Osgi Service Platform, Release 3
Osgi Service Platform, Release 3
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Originally designed for the management of network-attached devices OSGi builds a de-facto standard to modularise all kinds of complex Java applications. It enables deployment and updating of components, which are called bundles, by supporting automatic resolution of inter-component dependencies. Despite these benefits the OSGi specification omits dedicated support for discovery, selection and loading of locally unavailable bundles. However, this is a key requirement for large distributed applications especially in dynamic and heterogeneous environments. Current solutions are server-based and provide a central bundle repository thereby representing a single point of failure. Furthermore, these approaches lack support for automatic bundle selection based on non-functional properties such as resource demand or performance. We introduce the D2CM infrastructure accounting these issues and enabling automatic discovery, selection and loading of bundles in a distributed system on basis of the peer-to-peer platform JXTA. By providing extended bundle descriptions, non-functional properties can be automatically evaluated for bundle selection and dependency resolution.