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Colloquium - Barnes

Customizing Web Middleware: Providing Differentiated Services and Custom Caching Policies
J. Fritz Barnes
University of California, Davis
3/23/2000
3:30pm-4:45pm

As web sites incorporate innovative content and interaction, the need for customization increases in middleware infrastructures. The web must allow servers, intermediaries, and clients to customize the processing of a web request, from the client's request to the server's response. An ISP that hosts web sites for multiple businesses highlights the server's need for customization. The quality of service of one company's web site depends on the quantity of requests made for all sites hosted by the ISP's web server. ISPs need to control the allocation of resources to different virtual sites to avoid the performance degradation due to one company receiving many more requests. On the other hand, clients of an information system may have different freshness and latency needs. The union of different, possibly conflicting, client requirements defines how the system should operate.

In this talk I will describe architectures I developed to support precisely the kinds of customization necessary to address these problems. One such architecture provides scheduling of web requests that supports higher level customization such as resource allocation to client requests. In the intermediate network, our system supports a domain specific language, CacheL, for specification of web caching policies. Thus, the specification of different caching policies allows the cache to handle web requests based on the needs of the client, cache environment, or object requested.

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Department of Computer Science
University of Colorado Boulder
Boulder, CO 80309-0430 USA
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