In this paper, we present a flexible Web service middleware framework based on the approach of 2SAP, two-way Web service application proxy. 2SAP is to address some critical issues in Web service enablement of communication services that require session based stateful transactions, two-way full duplex Web service interaction, asynchronous operations and event notification. We introduce the concept of meta-services and base-services in Web service middleware architecture design, and we investigate three options that can be applied to synthesize the service interface descriptions of these services in current WSDL frameworks. Based on the dependency and interaction pattern analyses, we describe the architecture of 2SAP that modularizes the service implementation and components along two dimensions, i.e. stateful vs. stateless and core vs. extension. We show that the architecture of 2SAP can support a variety of collocated and distributed service integration configurations. Our experimental studies indicated that the service platform of the proposed 2SAP architecture can support the needs of Web service and SOA enablement of real-time communication services.
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