Afterward, the clients can find the description in the registry.
Among the Web services description is the description of the WSB.
2. Find: Clients searching for services are able to satisfy their desired QoS. This operation
returns the WSDL description document of suitable Web services. The WSDL description
includes all QoS classes the service is providing (e.g., Class1: [ Best Effort ], Class2: [
Guaranteed: RT < 12ns, Cost = 50$, NQ/day = 100 ], Class3: [??¦.. ]).
3. Invoke: The invocation operation is achieved using binding information described
in WSDL. Clients may invoke first the WSB in order to negotiate the QoS of a Web
service.
4. Bind: After a negotiation phase is finished, the client is redirected by WSB to the
available service that provides the required QoS. Selection of the target service by
WSB is based as well on the load distribution among duplicated Web services. To
achieve this task, WSB continually requests performance information from the server
side and uses it to make the selection decision (Web services availability, Web services
capacity, server location, load information, etc.).
Serhan , Bad d , & Mohamed-Salem
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc.
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