WSLA and Service Definitions Sample Clauses

WSLA and Service Definitions. A WSLA agreement complements a service definition. While a service description, for example, using WSDL defines the service interface relationship between a service and its using application, the WSLA defines the agreed performance characteristics and the way to evaluate and measure them. WSLA complements service description languages. Service descriptions are input to the design and implementation of the service system and the client application using its service. The WSLA provides input to the measurement and management system of an organization that checks and manages an organization’s compliance with a WSLA. The instrumentation of service and service-using application can be instrumented to gain measurements for the evaluation of the WSLA. See Figure 1. Both service provider and service customer may run their own instrumentation and measurement and management systems. Each organization may access measured metrics from various sources, such as server-side metrics from the provider and client-side metrics from the custom er. This allows parties to determine both a service’s performance within a service provider’s domain and its performance as experienced by a user. WSLA Measurement & Management Measurement & Management Metrics Metrics Instrumentation Service Description e.g. WSDL Instrumentation Service Using Application Service Invocation Service Service Consumer Service Provider Figure 1: Role of a Web Service Level Agreement. The relationship between a Web Service Level Agreement and the measurement and management system that deals with it is more dynamic than the relationship between a service description and its implementing service. Usually a service implements one or several service interfaces. It is unusual that service interfaces are added to a service dynamically because t his step involves programming in many cases. However, it is easy to imagine that the same ser vice is sold by a provider with different service levels, e.g. at different guaranteed response ti mes. This may be the result of short term, individual negotiation and should be able to be processed flexibly by the measurement and management system.
Sample 1
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Related to WSLA and Service Definitions

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