Abstract
Cloud computing and Future Internet promise a new ecosystem where everything is as a service, reachable and connectable anywhere and anytime, everyone succeeding to get a service composition that meets his needs. But do we have the structure and the appropriate properties to design the service components and do we have the means to manage, at run-time, the personalised compositions corresponding to Service Level Agreement? In this article we introduce an entity of service composition called Self-Controlled Component (SCC), including, since the design step, functional and non-functional specifications. SCCs benefit both from the strong structure, explicit composition, and autonomic management of component-oriented programming, from the highly dynamic composition, and from the discovery capacities of service-oriented computing. Self-control mechanisms are then attached automatically to SCCs to enable autonomic application management during execution. The objective of this new concept is to provide strong Quality of Service (QoS) guarantees of composed applications. We illustrate the approach using an example called Springoo, to how in the context of a legacy application the contributions and benefits of our solution. For the management of the service composition we propose the concept of Virtual Private Service Network (VPSN) and Virtual Service Community (VSC) that allows us to model the personalised Service Level Agreement (SLA) where user requirements and provider offers converge on a QoS contract.
Highlights
Cloud computing and Future Internet ecosystems are attractive for several reasons
In a context where these components are Self-Controlled Component (SCC), and in order to use service components adapted to the user demand, we propose to preselect them at the session initialisation
We find the "Service Level Agreement (SLA) Management Actions" (Fig. 12, bullet 5.2), which define the list of actions to do, more those provided at the SCC components level (6), ie at the Virtual Private Service Network (VPSN) level, for the end-to-end service delivery
Summary
Cloud computing and Future Internet ecosystems are attractive for several reasons. They allow designing your own application from components offered in a catalog, and connecting almost everything. We define service components that at the same time provide the guarantee of a certain service level and enable autonomic adaptation of the composition to ensure that this service quality will be guaranteed during the application execution. Our proposal presented in this paper is to use GCM and its strongly structured entities to provide a service oriented component platform that eases the design and execution of self-controlled services with SLA guarantees. Our contribution is first to define serviceoriented GCM components, i.e. hierarchical components restrained to service-oriented features Relying on this model, we design specific support for SLA and contracts dedicated to these service-components. These properties allow exposing components in a library (catalog), sharing components for use in different applications, and assembling them in a personalised session
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