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The main issues for the fulfillment service level agreements (SLA) are concerned with problem of variability of QoS properties (vQoS). Indeed, the QoS properties may evolve frequently either because of internal changes or because of workload fluctuations. To solve the vQoS problem, we first introduced three variability operators: replicate, delete and replace. These operators will be used to reconfigure...
The relevance of the service interfaces' granularity and its architectural impact have been widely investigated in literature. Existing studies show that the granularity of a service interface, in terms of exposed operations, should reflect their clients' usage. This idea has been formalized in the Consumer-Driven Contracts pattern (CDC). However, to the best of our knowledge, no studies propose techniques...
Current approaches to Quality of Service (QoS) monitoring using Service Level Agreements (SLAs) fall short of appreciating the many possible causes of breaching these digital contracts. These approaches are mainly concerned with the enforcement of these contracts without paying attention to what aspects of the service oriented environment the service provider has no control over and which have direct...
Service contracts function as interfaces which bridge IT implementation, business modeling, and economical analysis among stakeholder. We report a review of recent research/practice(to be completed) with focus on contract content and contract management. Dimensions of { Quality of data(QoD), Quality of service(QoS), Legal issue, Context, Business term } and { Description of contract, Monitor/Control,...
QoS-aware service composition intends to integrate services from different providers and maximize the global QoS in order to increase the user's satisfaction degree while subjecting to dynamic context constraints. Current composition approaches only focus on optimizing a single process to maximize the satisfaction degree for one party. When multiple processes are performed concurrently by their selfish...
In Cloud service composition, collaboration between brokers and service providers is essential to promptly satisfy incoming Cloud consumer requirements. These requirements should be mapped to Cloud resources, which are accessed via web services, in an automated manner. However, distributed and constantly changing Cloud-computing environments pose new challenges to automated service composition such...
Requirements on message-based interactions can be formalized as an interface contract that specifies constraints on the sequence of possible messages that can be exchanged by multiple parties. At runtime, each peer can monitor incoming messages and check that the contract is correctly being followed by their respective senders. We introduce cooperative runtime monitoring, where a recipient "delegates"...
Service-Oriented Architecture (SOA) fosters the development of loosely coupled applications. Web services have been favored as a promising technology to implement SOAs. Since web services are often involved in complex business processes and safety-critical systems, it is important that they are of high level of reliability. In this paper a strategy for event-based testing of web services is introduced...
Computing environments are becoming more open, distributed and pervasive. The web services compositions we build for these dynamic environments will need to become more adaptable and adaptive to unexpected events. This paper proposes a new web services compositions model-Organization Oriented Adaptive Web Services Compositions Framework (OOAWSCF) allowing dynamically adaptively evolve to keep up with...
An integrated approach to quality of service for content delivery using Web services includes quality definitions, user contracts, and fault monitoring.
SOA4All will help to realize a world where billions of parties are exposing and consuming services via advanced Web technology. The outcome of the project will be a comprehensive framework and infrastructure that integrates four complimentary paradigm-shifting technical advances into a coherent and domain independent service delivery platform: Web principles and technology as the underlying infrastructure...
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