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The cloud computing paradigm enables the provision of costefficient IT-services by leveraging economies of scale and sharing data center resources efficiently among multiple independent applications and customers. However, the sharing of resources leads to possible interference between users and performance problems are one of the major obstacles for(More)
Multi-tenant applications serve different customers with one application instance. This architectural style leverages sharing and economies of scale to provide cost efficient hosting. As multi-tenancy is a new concept, a common definition of the word and related concepts is not yet established and the architectural concerns are not fully understood. This(More)
Service-oriented architectures (SOA) will form the basis of future information systems. Basic web services are being assembled to composite web services in order to directly support business processes. As some basic web services can be used in several composite web services, different business processes are influenced if for example a web service is(More)
An integrated management of business processes demands a strictly process-oriented development of the supporting IT. Process-orientation is especially promoted by Service-Oriented Architectures (SOA), where loosely coupled business services are being composed to executa-ble processes. In this paper we present a model-driven methodology for a top-down(More)
The 4CaaSt project aims at developing a PaaS framework that enables flexible definition, marketing, deployment and management of Cloud-based services and applications. This paper describes the major challenges tackled by 4CaaSt for the comprehensive management of applications and services in a PaaS. These challenges involve the blueprint language to(More)
The management of web service composition, where the employed atomic web services as well as the compositions themselves are offered on basis of Service Level Agreements (SLA), implies new requirements for the management infrastructure. In this paper we introduce the conceptual design and implementation for a standard-based and flexible manageability(More)
— Service providers have to monitor the quality of offered services and to ensure the compliance of service levels provider and requester agreed on. Thereby, a service provider should notify a service requester about violations of service level agreements (SLAs). Furthermore, the provider should point to impacts on affected processes in which services are(More)
— Supporting business services through Web service compositions (WSC) as part of service-oriented architectures (SOA) involves business performance monitoring requirements. Their implementation results in additional development activities. To support these activities, we already contributed a model-driven approach to the development of monitored WSC as part(More)
A software application is related to the processes it supports. Today, UML diagrams esp. use case diagrams and activity diagrams are often used to model the relevant aspects of the processes within the analysis phase. In the design phase the models are manually mapped to the business layer of the software application. In the context of Service-oriented(More)