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The Web Services Invocation Framework (WSIF) supports a simple Java API for invoking Web services, no matter how or where the services are provided. The framework allows maximum flexibility for the invocation of any Web Services Description Language (WSDL)-described service. Using WSIF, WSDL can become the centerpiece of an integration framework for accessing software running on diverse platforms and using widely varying protocols. The only precondition is that the software needs to be described using WSDL, and to have included in its description a binding that the client's WSIF framework has a provider for. WSIF defines and comes packaged with providers for local Java, Enterprise JavaBeans (EJB), Java Message Service (JMS), and Java EE Connector Architecture (JCA) protocols, which means that a client can define an EJB or a Java Message Service-accessible service directly as a WSDL binding and access it transparently using WSIF, using the same API one would use for a SOAP service or a local Java class. == Structure == In WSDL, a binding defines how to map between the abstract ''PortType'' and a real service format and protocol. For example, the SOAP binding defines the encoding style, the ''SOAPAction'' header, the namespace of the body (the targetURI), and so forth. WSDL allows there to be multiple implementations for a Web service, and multiple ports that share the same PortType. In other words, WSDL allows the same interface to have bindings to for example, SOAP and IIOP. WSIF provides an API to allow the same client code to access any available binding. As the client code can then be written to the PortType, it can be a deployment or configuration setting (or a code choice) which port and binding it uses. WSIF uses ''providers'' to support these multiple WSDL bindings. A provider is a piece of code that supports a WSDL extension and allows invocation of the service through that particular implementation. WSIF providers use the J2SE JAR service provider specification, making them discoverable at runtime. Clients can then utilize any new implementations and can delegate the choice of port to the infrastructure and runtime, which allows the implementation to be chosen on the basis of quality of service characteristics or business policy. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Web Services Invocation Framework」の詳細全文を読む スポンサード リンク
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