Electrical computers and digital processing systems: multicomput – Distributed data processing – Client/server
Reexamination Certificate
2005-06-28
2005-06-28
Bragdon, Reginald G. (Department: 2188)
Electrical computers and digital processing systems: multicomput
Distributed data processing
Client/server
C709S229000, C711S133000, C711S144000
Reexamination Certificate
active
06912562
ABSTRACT:
A Web server maintains, for one or more resources, a respective list of clients who requested that resource. The server takes on the responsibility of notifying all of those clients on when the resource in question changes, thereby letting them know that if the resource is again asked for by a user, an updated copy will have to be requested from the origin server. The server thereupon purges the client list, and then begins rebuilding it as subsequent requests come in for the resource in question. Invalidation messages are sent to selected “victim” clients on the client list, independent of whether the resource in question has changed, when the list meets a predetermined criterion, such as becoming too large. The victim clients may include clients who access the server less frequently than others, clients who have accessed the server in the more distant past than other clients, i.e., using a first-in-first methodology, or clients who have not subscribed to a service that keeps them from being victim clients. Review of a client list to determine whether it meets the selected criterion can be invoked every time a client gets added to a client list or on a scheduled basis.
REFERENCES:
patent: 6578113 (2003-06-01), Krishnamurthy et al.
B. Krishnamurthy and C. Wills, “Piggyback Server Invalifation for Proxy Cache Coherency,” Proceedings of the WWW-7 Conference, Brisbane, Australia, Apr. 1998, pp. 185-194.
J. Dilley et al., “The Distributed Object consistency Protocol,” Technical Report HPL-1999-109, Hewlett-Packard Labs, 1999.
R. Tewari et al., “WCDP: A Protocol for Web Cache Consistency,” 7thInternational Workshop on Web Content Caching and Distribution (WCW), 2002.
Krishnamurthy Balachander
Rabinovich Michael
AT&T Corp.
Bragdon Reginald G.
Slusky Ronald D.
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