(DOWNLOAD) "Engineering and Computer Science. (Abstracts)." by Journal of the Alabama Academy of Science * eBook PDF Kindle ePub Free
eBook details
- Title: Engineering and Computer Science. (Abstracts).
- Author : Journal of the Alabama Academy of Science
- Release Date : January 01, 2002
- Genre: Engineering,Books,Professional & Technical,
- Pages : * pages
- Size : 163 KB
Description
ADAPTABLE WEB SERVICES. Song Zhou, Deptment of Computer and Information Sciences, University of Alabama At Birmingham, Birmingham, AL 35294-1170 Web services are becoming one of the mostly influential technologies for developing heterogeneous distributed applications. So it is valuable to create an adaptable web service, which can be reconfigured as the environment changes. This can be achieved by utilizing the generative programming technique and the extensibility provided by the Web Service Description Language (WSDL). In WSDL, an interface is defined in three steps. Firstly, we define the abstract interface, or "port type." Then the port type is bound to a specific message format and transmission protocol into a "binding." Finally, the binding is bound to a specific address into a concrete interface, or "port." Several ports are organized into a web service. To make a web service adaptable, we can define a meta port type for reflection, which will bc supported by all the web services that are to be adaptable. All user-visible variation points will be exposed as available operations. The meta port type will provide the operation to query those prede fined operations. Interfaces can be defined or redefined by composing those operations. It will also provide the operations for specifying the desired message format and transmission protocol. Additional operations can be defined for supporting the user-transparent variation points, such as tuning the performance, setting the security level, etc.
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