Estimating and eliminating redundant data transfers over the web: a fragment based approach

Abstract

SUMMARYRedundant data transfers over the Web, can be mainly attributed to the repeated transfers of unchanged data. Web caches and Web proxies are some of the solutions that have been proposed, to deal with the issue of redundant data transfers. In this paper we focus on the efficient estimation and reduction of redundant data transfers over the Web. We first prove that a vast amount of redundant data is transferred in Web pages that are considered to carry fresh data. We show this by following an approach based on Web page fragmentation and manipulation. Web pages are broken down to fragments, based on specific criteria. We then deal with these fragments as independent constructors of the Web page and study their change patterns independently and in the context of the whole Web page. After the fragmentation process, we propose solutions for dealing with redundant data transfers. This paper has been based on our previous work on 'Web Components' but also on related work by other researchers. It utilises a proxy based, client/ server architecture, and imposes changes to the algorithms executed on the Proxy server and on clients. We show that our proposed solution can considerably reduce the amount of redundant data transferred on the Web.

A component- and push-based architectural style for ajax applications

“…It is built on top of JavaServer Faces (Jsf) 7 , the new J2EE presenta-tion architecture. Jsf provides a user interface component-based framework following the model-view-controller pattern.…”

“…Many techniques such as caching, proxy servers and fragment-based resource change estimation and reduction [7], have been adopted in order to reduce data redundancy. Delta-encoding [35] uses caching techniques to reduce network traffic.…”

“…Using a generic interface and providing identification that is common across the Web for resources has been one of the key success factors of the Web. The nature of Web architecture which deals with Web pages as resources causes redundant data transfers [7]. The delta-communication way of interaction in Spiar is based on the component level and does not comply with the Resource/URI constraint of the Web architecture.…”

“…Fragment-based research [7,11,13] aims at providing mechanisms to efficiently assemble a web page from different parts to be able to cache the fragments. Recently proposed approaches include several server-side and cache-side mechanisms.…”

An Architectural Style for Ajax

“…After the required action, the server renders the changes to be responded to the engine again in BXML format. 5 www.backbase.com 6 JavaServer Faces Specification v1.1, http://java.sun.com/j2ee/javaserverfaces/…”