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High availability presence engine for instant messaging

  • US 7,949,712 B2
  • Filed: 02/10/2003
  • Issued: 05/24/2011
  • Est. Priority Date: 02/10/2003
  • Status: Expired due to Fees
First Claim
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1. A system for a high availability presence engine for instant messaging, comprising:

  • a plurality of presence engines for receiving presence information on users, wherein one of the plurality of presence engines is assigned to a user and the user'"'"'s contacts;

    a global table engine accessible to the plurality of presence engines, the global table engine including user presence information and being operable to receiving presence changes from the plurality of presence engines; and

    a plurality of local tables accessible to the plurality of presence engines and the global table engine, wherein the plurality of local tables are configured such that each of the plurality of local tables is associated with at least one of the plurality of presence engines and being operable to receive presence change information from the global table engine if the associated local table is affected by the presence change information.

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