Serpentine: adaptive middleware for complex heterogeneous distributed systems
Proceedings of the 2008 ACM symposium on Applied computing
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The OSGi platform embodies the desirable concepts of modularity and dynamic components to build a Service Oriented Platform, whose components interact by means of well defined contracts. Despite being service oriented, it lacks mechanisms to differentiate service's customers from each other and, therefore, it fails to provide different Service Level Agreements. In this paper we start by isolating customers from each other and at a later stage provide mechanisms to offer adequate SLAs. As each client is isolated in a self-contained environment we are able to decouple them from the platform (and from the underlying node) to offer mobility among nodes. The advantages of this approach are two-fold: 1) ability to cope with node failures by migrating customers to healthy nodes and 2) optimization of global resource resource usage and further enforcement of SLA by migrating customers to nodes with adequate resources available.