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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)
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)
— 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)
— 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)
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)
Theupcomingbusinessmodelofproviding software as aservice (SaaS) not only creates newc hallengesf or servicep roviders buta lsof or software engineers. To enable a cost-efficient service management, the hosted application shouldsupportmulti-tenancy.For implementing multi-tenancy,several options are available, whereas all of them to ac ertain degree require(More)
— The 4CaaSt project aims at developing a PaaS framework that enables flexible definition, marketing, deployment and management of Cloud-based services and applications. The major innovations proposed by 4CaaSt are the blueprint and its lifecycle management, a one stop shop for Cloud services and a PaaS level resource management featuring elasticity. 4CaaSt(More)