Xiang Liu

US Patent:

6678791, Jan 13, 2004

Filed:

Aug 4, 2001

Appl. No.:

09/923072

Inventors:

Lawrence Jacobs - Redwood City CA
Xiang Liu - San Mateo CA
Shehzaad Nakhoda - Palo Alto CA
Zheng Zeng - Foster City CA
Rajiv Mishra - Foster City CA

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06F 1200

US Classification:

711118, 709203, 709227, 711133

Abstract:

A session-aware system and method for caching and serving data. A session-aware cache system stores data that may be designated or restricted for service to registered sessions or data requests that include session identifiers. A request for a restricted set of cached data that omits a session identifier is passed to an origin server (e. g. , web server, data server) so that a session may be established and a session identifier assigned. The session-aware cache system may determine whether a session identifier of a data request is near expiration. If so, the request may be passed to the origin server so that the session lifetime may be extended.

US Patent:

6785769, Aug 31, 2004

Filed:

Aug 4, 2001

Appl. No.:

09/923073

Inventors:

Lawrence Jacobs - Redwood City CA
Xiang Liu - San Mateo CA
Shehzaad Nakhoda - Palo Alto CA
Zheng Zeng - Foster City CA
Rajiv Mishra - Foster City CA

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 1200

US Classification:

711118, 711133, 711146, 709203, 709232

Abstract:

A system and method for caching multiple versions of a data item (e. g. , web page, portion of a web page, data table, data object) and determining which of the multiple versions is most responsive to a particular request. A request is received and an initial cache lookup is done with a data identifier (e. g. , URL, URI) extracted from the request. If the lookup is unsuccessful (i. e. , nothing is returned), the request is passed to an origin server (e. g. , web server, data server). If the lookup is successful, it may provide or identify the desired data item (if one version of the data item is served for all requests) or a policy to be applied to determine which version to serve. The cache applies the policy, which identifies the additional parameters, cookies or other information to be considered, and a second lookup is done with the additional information.

US Patent:

6789170, Sep 7, 2004

Filed:

Aug 4, 2001

Appl. No.:

09/923103

Inventors:

Lawrence Jacobs - Redwood City CA
Xiang Liu - San Mateo CA
Shehzaad Nakhoda - Palo Alto CA
Rajiv Mishra - Foster City CA
Zheng Zeng - Foster City CA
Sachin Desai - San Francisco CA

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 1200

US Classification:

711133, 709203, 709227

Abstract:

A system and methods are provided for enabling a cache system, operating on behalf of a data server (e. g. , web server, application server, database server), to cache and customize one set of data (e. g. , a web page) in different ways for different requests (e. g. , to include a clients name, account information, a special logo). An application that generates or produces the data on the data server embeds or includes special tags or markers in customizable data, to identify where custom data should be inserted or substituted. The custom data may be included in client requests or retrieved from the cache system, data server or elsewhere. When the cache system receives a new request for cached data that is customizable, the data is retrieved from cache, the custom data is retrieved and inserted at the corresponding tags and the customized data is served.

US Patent:

6799251, Sep 28, 2004

Filed:

Aug 29, 2000

Appl. No.:

09/649850

Inventors:

Lawrence Jacobs - Redwood City CA
Roger Bamford - Woodside CA
Xiang Liu - San Carlos CA
Shehzaad Nakhoda - Palo Alto CA
Zheng Zeng - Foster City CA

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 1212

US Classification:

711133, 711156

Abstract:

A method and system are provided for caching data in a manner that substantially maintains a desired level of system performance. A cache server receives data requests on behalf of a data server. When new data on the data server is generated or stored that replaces or changes data cached on the cache server, the corresponding data on the cache server is invalidated. A subsequent request for the new data may be forwarded to the data server or may be served with the invalid data on the cache server. Determining how to serve the request may depend on a possible impact on system performance and/or one or more characteristics or parameters associated with the requested data. The impact on system performance may be determined by examining actual and/or desired operating conditions (e. g. , rate or number of requests, load on the data server, response time to requests, number of open connections, throughput). The data parameters that may be considered may include the popularity of the data; frequency of access to the data; number of accesses; age, size, or type of the data; whether or when a version of the data on the cache server is invalid; how severely invalid the cache server version is; the cost of retrieving the data from the data server; etc.

US Patent:

6934720, Aug 23, 2005

Filed:

Aug 4, 2001

Appl. No.:

09/922617

Inventors:

Lawrence Jacobs - Redwood City CA, US
Xiang Liu - San Mateo CA, US
Jesse Anton - San Francisco CA, US
Thorsten Lockert - Los Gatos CA, US

Assignee:

Oracle International Corp. - Redwood Shores CA

International Classification:

G06F017/30

US Classification:

707200, 707201, 707202, 707203, 707204, 707205

Abstract:

A system and method are provided for automatically invalidating cached data. A cache system caches data from a data server (e. g. , web server, application server, database). When a request is received at the cache system from a client, particularly a request to alter or replace a set of data, the request is examined and may be compared to a set of rules or data relationships that invoke automatic invalidation. Based on a pattern or content of the request (e. g. , an identifier of data to be changed), the cache system identifies and invalidates a cached data item without waiting for the data server to receive the request, process it and instruct the cache system to invalidate the data item. In a cache system comprising multiple caches, one cache may notify another when automatic invalidation is necessary.

US Patent:

6973536, Dec 6, 2005

Filed:

Aug 31, 2001

Appl. No.:

09/944832

Inventors:

Lawrence Jacobs - Redwood City CA, US
Xiang Liu - San Mateo CA, US
Marcin Porwit - San Francisco CA, US
James Feenan - Windham NH, US
William Wright - Bedford NH, US

Assignee:

Oracle Corporation - Redwood Shores CA

International Classification:

G06F012/00

US Classification:

711119, 711129, 711130

Abstract:

A self-adaptive hybrid cache and method of caching data objects. A set of cacheable data objects is partitioned among a set of cooperating caches (e. g. , a cache cluster). A hybrid cache is configured to cache data objects that it owns (i. e. , objects in its partition) as primary content and to also cache data objects that are owned by other caches as secondary content (e. g. , based on demand for such objects). A hybrid cache stores and/or removes objects based on criteria such as validity, popularity, size, age, cost of replacing, amount of available cache space, whether the objects are primary or secondary, etc. Over time, the amount or ratio of primary and secondary data that a hybrid cache stores may fluctuate dynamically.

US Patent:

7010180, Mar 7, 2006

Filed:

Aug 13, 2003

Appl. No.:

10/639824

Inventors:

Adriaan J. de Lind van Wijngaarden - New Providence NJ, US
Xiang Liu - Marlboro NJ, US
Chongjin Xie - Morganville NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 6/00

US Classification:

385 11, 385 3, 385 24, 359483, 398152

Abstract:

A system and method for multi-channel PMD/PDL/PDG mitigation, the system including polarization scramblers adapted to vary the state of polarization of an optical signal propagated through the system to effectively vary the polarization mode dispersion experienced by the signal during each burst-error-correcting-period of the forward error correction used in the system.

US Patent:

7062176, Jun 13, 2006

Filed:

Dec 30, 2002

Appl. No.:

10/331217

Inventors:

Xiang Liu - Marlboro NJ, US
Colin J McKinstrie - Manalapan NJ, US
Linn Frederick Mollenauer - Colts Neck NJ, US
Richart Elliott Slusher - Lebanon NJ, US
Xing Wei - New Providence NJ, US
Chunhui Xu - Ithaca NY, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 10/02
H04B 10/18
G02B 5/00
G02F 1/03
G02F 1/355
H04B 10/06
G02F 1/35
G02F 1/377

US Classification:

398159, 398208, 385 1, 385122

Abstract:

A nonlinear phase-shift compensation method and apparatus is provided for improving system performance in optical transmission systems. The apparatus includes a phase-shift compensating device that provides a partial compensating phase shift to reduce the nonlinear phase noise resulting from self-phase modulation and amplified spontaneous emissions in an optical transmission system.