These management frameworks differ in terms of the QoS parameters considered and in the
way the management tasks are performed. Now, most of the management infrastructures for
Web services are moving towards the integration of the QoS management within the service-
oriented architecture. An example of these infrastructures are the OASIS Web Services
Distributed Management (WSDM) (OASIS, 2005), and the WS-Management from Microsoft
(WS-Management, 2005). Some issues such as scalability, QoS guarantee, and high availability
of Web services are still less considered in the above frameworks. These features will
add value to the emerging architectures for QoS management in Web services.
QoS.Management.Functionalities.
Most works on QoS management have been done in the context of multimedia distributed
systems (e.g., delivery of video documents). QoS issues were also considered in Web-based
applications, such as electronic commerce, where users access online catalogues, which
may contain multimedia information. Traditionally, QoS provisioning is achieved through
a number of phases such as the following: QoS specification, publication, discovery, negotiation,
binding, adaptation, termination, and billing.
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