Web Content Delivery (Web Information Systems Engineering and Internet Technologies Book Series)

The idea that of content material supply (also referred to as content material distribution) is be­ coming more and more vital because of swiftly starting to be calls for for effective distribution and quickly entry of knowledge within the net. content material supply is especially vast and finished in that the contents for distribution disguise quite a lot of forms with considerably varied features and function issues, together with HTML files, photographs, multimedia streams, database tables, and dynamically generated contents. furthermore, to facilitate ubiqui­ tous info entry, the community architectures and units additionally range commonly. they vary from broadband wired/fixed networks to bandwid- restricted wireless/mobile networks, and from strong workstations/PCs to non-public electronic assistants (PDAs) and mobile telephones with constrained processing and show services. some of these degrees of range are introducing a variety of demanding situations on content material supply applied sciences. it's fascinating to carry contents of their highest quality according to the character of the contents, community connections and purchaser units. This e-book goals at supplying a photo of the state of the art examine and improvement actions on web pages supply and laying the rules for destiny internet purposes. The e-book specializes in 4 major parts: (1) internet con­ tent supply; (2) dynamic websites; (3) streaming media supply; and (4) ubiquitous internet entry. It involves 17 chapters written by means of prime specialists within the box. The ebook is designed for a qualified viewers together with educational researchers and business practitioners who're drawn to the latest study and improvement actions on web pages supply.

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As the unique server sends this code dynamically, it keeps shut keep watch over over the requests on the proxy, and the proxy continues its personal simplicity regardless of of the potential complexity within the cellular code. The energetic proxy made it attainable for us to review lively question caching at proxies for database net servers. however, because the energetic proxy was once in its prototype level and lively question caching was once a brand-new program of the energetic proxy, we discovered a number of classes from our adventure. One significant factor is that the lively proxy doesn't supply any memory-resident constitution for cache applets. this isn't a problem of the lively Cache protocol yet is expounded to the CERN proxy layout and implementation. components are concerned. One is that the CERN proxy doesn't have memory-resident cache. the opposite is that CERN proxy forks one approach according to request and so the cache applet's reminiscence constitution can't be at once handed again to the proxy. This hindrance had a powerful damaging impression on our implementation's functionality. three, similar paintings With the rise of dynamic content material on the net, researchers have all started learning the overall challenge of caching dynamic content material from quite a few facets. one of the earliest paintings is to review find out how to successfully determine and replace out of date pages within the internet server cache [Challenger et al. , 1999]. one of the latest paintings is set the tradeoff among functionality and information freshness [Labrinidis and Roussopoulos, 2004]. Our procedure enhances those serverside suggestions since it addresses the matter within the context of internet proxies Proxy Caching for Database-Backed sites and goals at sharing database internet server workload and decreasing community site visitors. during this feel, DBProxy [Amiri et al. , 2003] is such a lot concerning our paintings other than it intercepts SQL statements from the JDBC motive force and therefore has complete wisdom in regards to the base facts schema and the SQL queries. Caching dynamic content material at proxies has additionally been studied in [Smith et al. , 1999]. Their procedure permits websites prone to specify outcome equivalence in generated files in order that the proxy can make the most of the equivalence to come back a cached consequence to a brand new request. such a lot lately, a number of teams have additionally labored on caching and replication for data-intensive sites [Candan et al. , 2001, Datta et al. , 2002, Li et al. , 2003, Tang and Chanson, 2003, Gao et al. , 2005]. despite the fact that, they don't ponder database question containment or review subsumed question on the proxy. not like different proxy caching schemes, which in simple terms cache non-executable net items, the lively Cache scheme [Cao et al. , 1998] permits servers to supply a section of Java code (called a cache applet) linked to a rfile. in comparison with the declarative nature and restricted scope of the Dynamic content material Caching Protocol [Smith et al. , 1999], the lively Cache scheme presents an easy and versatile interface to internet servers on the fee of a potential overhead linked to the cellular code. such a lot recendy, a number of businesses have proposed an open ordinary ESI (Edge aspect Includes).

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