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In the open and dynamic pervasive computing environment, it is challenging to detect and handle the frequently occurred failures of service request. The widely used transparent mechanisms Remote Procedure Call and Object Request Broker have a great impact on the adaptive fault-tolerance, because they make it difficult for service requester to sense, configure and control the service request process. In this paper, we explicitly encapsulate and expose the service request process as the first-class object. By the exposed service request object, both the pervasive computing platform and the user applications are able to acquire the adaptive and systematic fault-tolerance ability during the service request process.