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Roles in WSCDL choreography define the behavior of participants in collaboration to achieve business objectives. These roles may be realized by one or more web services. The quality of service (QoS) of roles and choreography are dependent on these QoS of competing web services. Service providers may or may not publish the values of attributes of the QoS of their services to enable their selection. Consequently, it is desirable to have an alternative strategy to compute values of attributes of QoS of web services. Further, WSDL descriptions of web services do not contain an order of invocation of operations. This invocation protocol may be needed by the client either for adaption or selection of web services. In this paper, I propose a method to discover invocation protocol of a web service and to capture values of attributes of QoS from its execution traces of web services. I have represented execution traces as Labeled Transition Systems (LTS) and merge these LTSs to obtain service invocation protocol. My LTS model defines a set of functions for attributes of QoS. These functions take a transition as input and return the value for a specific attribute of QoS. These functions are used to compute the range of values of QoS attributes. I have demonstrated my methodology through an example.
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- A Model of Computation of QoS of WSCDL Roles from Traces of Competing Web Services
Ravi Shankar Pandey
- Springer Singapore
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