International Business Machines Corporation

Mark David Gilmore

Victor S Moore

Michael A Gilfix

Ofira Tal-Aviv

Anthony William Wrobel, Jr

Paul D Lewis

Benson K Chen

Scott Michael Preddy

Benson Kwuan-Yi Chen

Anthony William Wrobel Jr

A system for managing failover in a server cluster. In response to detecting a failed server, subscription message processing of a failover server is stopped. A subscription queue of the failed server is opened. A marker message is published to all subscribers of a particular messaging topic. The marker message includes an identification of the failover server managing the subscription queue of the failed server. Messages within the subscription queue of the failed server are processed. In response to determining that a message in the subscription queue of the failed server is the marker message, the subscription queue of the failed server is closed. Then, the failover server resumes processing of its original subscription queue looking for the marker message, while processing yet unseen messages from the queue. Once the marker message is found in the original subscription queue, normal operation is resumed.

Method and system for handling failover in a distributed environment that uses session affinity

The present invention extends a servlet filter chain model to include the ability to dynamically define helper functions. These dynamic helper functions modify the state of an XCAP or SIP request or response as it transitions through the filter chain. The dynamic helper functions are defined via descriptor files that are based on the document type. Each filter in the filter chain has the ability to reference and invoke the helper functions to modify the state of the request and/or response.

XCAP and SIP filter chain state transforms via dynamic helper functions for internet multimedia subsystems

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Durham, NC, United States of America

Mark David Gilmore