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UDDI Registry In addition to service interface declaration (WSDL) and the SOAP messaging standard, a large enterprise also needs a central place where the service provider can publish their services using WSDL and the service consumers can discover existing services. This is mainly due to the fact that in a large enterprise, developer resources may be dispersed geographically. In particular, the service providers and service consumers may be located far apart. Such a central place is given the name registry. A registry is like a library card catalog used for recording the arrival of new books and other media as well as looking up books and other media. Another common analogy is the telephone system s Yellow Pages, used by service providers to publish their services and by service consumers to find services. The Universal Description, Discovery, and Integration (UDDI) specification defines a standard way of registering, deregistering, and looking up services. Figure 7.8 shows how UDDI enables the dynamic description, discovery, and integration of services. A service provider first registers a service with the UDDI registry. A service consumer looks up the required service in the UDDI registry. Then, when it finds the required service, the consumer directly binds with the provider to use the service. Figure 7.9 shows the basic structure of the data model of a UDDI registry. This structure consists of five basic constructs. The meaning, the use, and the relationships among these basic constructs will be explained in 14. The role of the UDDI registry in Web Services is similar to the role played by a search engine on the Internet. The power of the search engine comes from the keywords used to classify content. In a similar manner, a fine-grained search for a Web Service is possible only if a service is classified properly. The classification and identification taxonomies present in the UDDI registry provide a starting point for describing Web Services. Equally important is the classification of the businesses and organizations that offer Web Services.
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UDDI Registry Find the service (2) Register service (1)
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Bind and use the service (3)
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businessEntity Information about a service provider n Namespace reference
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Namespace reference
businessService Descriptive information about a particular service n
tModel Technical fingerprint specification and taxonomies
Service type reference
bindingTemplate Technical information about a service and endpoint specification
Namespace reference
publisherAssertion Information about relationship between parties
Basic constructs of the UDDI registry data model
Here are the three categories of binding to a specific service after the service has been discovered through the use of the registry:
Development time binding In this case, in addition to the signatures of the service operations and the service (network) protocol, the actual physical location of the service is known at development time. The client logic is developed accordingly. Thus, the binding is hard-coded to use a speci c service and is permanent. Partly runtime binding As in the previous case, the signatures of the service operations, as well as the network protocol are known at development time. However, the address of the speci c service is not known during code development. In this case, the consumer application is enabled to dynamically bind to different service instances by looking up services with a speci c name or property in the repository. For example, a consumer application looks up printing services with
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different names, depending on the printer name selected by the user. Another example is the case where a printer service is selected based on properties such as the oor number and document type.
Runtime binding In this case, even the service speci cation (that is, the operations signatures) and the protocol are not known at development time. The client can still discover a service via properties such as oor number and document type, but with an unknown service interface. In this case, some kind of re ection mechanism must be implemented at the client side that enables the client to dynamically discover the semantics of the service and format of valid requests. This type of service discovery is the most complex and is not used often because it requires very complex client logic to dynamically interpret the semantics of an unknown service interface.
WS-I Basic Pro le The Web Services Interoperability (WS-I) Organization is an open industry effort chartered to promote Web Services interoperability across platforms, applications, and programming languages. The organization brings together a diverse community of Web Services leaders to respond to customer needs by providing guidance, recommended practices, and supporting resources for developing interoperable Web Services. The WS-I Basic Profile provides constraints and clarifications to those base specifications (XML, SOAP, WSDL, and UDDI) with the intent to promote interoperability. Where the profile is silent, the base specifications are normative. If the profile prescribes a requirement or constraint, it supersedes the underlying base specification. Some of the constraints imposed by the profile are intended to restrict, or require, optional behavior and functionality so as to reduce the potential for interoperability problems. Some of the constraints or requirements are provided to clarify language in the base specification that may be the source of frequent misinterpretation and have been a frequent source of interoperability problems. Here are some examples of WS-I Basic Profile specifications:
The Basic Pro le prohibits protocol bindings other than SOAP, because SOAP binding is the most commonly used and well de ned. In this case, the WSDL standard is being restrained. The Basic Pro le limits the transport protocol to HTTP and HTTPS. The Basic Pro le vetoes the use of any encoding, including SOAP encoding. The Basic Pro le disallows overloading operation names.
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