| Summary: | 碩士 === 逢甲大學 === 資訊工程所 === 90 ===
In the distributed computing environment, the service discovery system plays a critical role to deliver services invoked by clients. With a service composition mechanism, the service discovery system can provide variety of services by combining the inherent services. However, for a resource-restricted environment such as an embedded system, it is impossible to put the service discovery system with service composition ability in the environment. In this thesis, we propose a service invocation mechanism in which any executable scripts or programs could be defined as a service no matter how the script or program is implemented by a specified programming language or APIs. We uses a directed graph to represent the services in a server of the service discovery system, and demonstrates how the service composition can be achieved by finding a path in the directed graph. We choose Service Location Protocol (SLP) to implement the proposed mechanisms. Experimental results show that the performance of service invocation and service composition under different testing environments is acceptable. The proposed service invocation and service composition mechanism can be integrated with a service discovery system to discover and control services remotely. It is very suitable to apply them to the pervasive computing.
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