Abstract:The variation of contexts in which a Web service could be used and the resulting variation in functional and Quality of Service (QoS) requirements motivates further research to extend Web services platforms to cater for differentiated service offerings and dynamic adaptability. Adaptability is an important requirement in the context of Web services to cater for the need of diverse set of client applications requesting customized view of consumed Web services to fit their own contexts and preferences. This pape… Show more
“…Workflow generating module will be responsible for establishing a service execution plan, which is workflow oriented. It will use BPEL4WS to specify the control flow (i.e., the order and rules controlling conversations between participating Web services) and the data-flow (i.e., the messages exchanged between the composed services) [13,14]. The semantics of BPEL4WS depend on WSDL, XML Schema and XPath.…”
This paper presents a model of workflow-oriented virtual enterprise based on policy driven and multi-agent service composition. The cooperation of the members in virtual enterprise will be implemented through the dynamic composition and execution of the services, which is workflow-oriented. Each service has its own policies for selection of the suitable services to achieve the cooperation and composition, which are described in WSPL and also registered into UDDI center as same as service description. In the policies, it defines the conditions for composition and cooperation, such as the accepted range of QoS with corresponding price charge, etc. The whole composition process will be executed through the interactions among multi agents, which include business analysis agent, service mapping agent and service allocation agent. Through such policy driven and multi-agent service composition, it can address winwin in the dynamically establishment of the workfloworiented virtual enterprise.
“…They generally tackle issues such as interface [5], behavioural [3], quality-of service [7], service-level agreement [8], or policy mismatches [6]. However, such techniques usually work in isolation and cannot be easily integrated to tackle complex monitoring and adaptation scenarios [10].…”
Abstract. Several techniques have been defined for the monitoring and adaptation of applications. However, such techniques usually work in isolation and cannot be easily integrated to tackle complex monitoring and adaptation scenarios. Furthermore, applications may have special requirements which make it difficult to reuse such off-the-shelf approaches. In particular, these requirements may cross several application layers such as -the organisation of stakeholder roles, coordination of planned activities, and integration with third-party services.In this paper we outline a lightweight, loosely-coupled and extensible monitoring and adaptation framework that allows application developers to integrate monitoring and adaptation techniques as units that can be linked to solve complex requirements and achieve cross-layer adaptation. In order to cater for application-tailored adaptation units, we propose a pattern-based technique for the development and integration of adaptation units.
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