To provide the value-added service discovery and reduce the cost of integration,
there are several requirements to be considered. In this chapter we focus on the
QoS-aware service discoveries and the semantics-aware service discovery.
QoS-aware service discovery is a necessary requirement for sophisticated Web services
applications. Being able to provide QoS-aware service discovery has several
distinct advantages. First, it allows the discovery and execution of the service according
to their QoS specifications. This forces the service provider to offer better
services to achieve competitive advantage. Second, it allows the Web services to be
Zhou, Ch a, and Lee
Copyright ?© 2007, Idea Group Inc. Copying or distributing in print or electronic forms without written permission
of Idea Group Inc. is prohibited.
applied in mission critical tasks. The service should provide its performance promises
in critical situations. The execution of the service should be monitored during its
life cycle to ensure the service conforms to the agreed service level objectives. If
undesired performance is detected, the service provider can take some management
activities to control the Web services??™ behavior.
Pages:
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401