Query trees including or nodes for event filtering

Details Query trees including or nodes for event filtering Query trees including or nodes for event filtering

2005-07-12

2005-07-12

An, Meng-Al T. (Department: 2126)

Electrical computers and digital processing systems: interprogra

Event handling or event notification

C717S144000

Reexamination Certificate

active

06918124

ABSTRACT:
Filtering trees for selectively notifying subscribers of events are provided, and are constructed with OR nodes to substantially reduce their size. The filtering trees have nodes representing event variables that ultimately branch to leaf nodes thereunder, and the leaf nodes identify which of a set of queries are satisfied by an actual event. A mechanism recursively merges nodes of trees into a single tree, and uses OR nodes when nodes cannot be combined, to essentially add a parallel path in the resulting tree to traverse. Nodes that can be combined are those that represent the same event variable, and may have data points that are merged into a combined node. Threshold gains in efficiency may be evaluated to determine whether the original trees should be kept instead of the resulting tree.

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Ehab S. Al-Shaer et al, A Survey of Event Filtering Mechanisms for Dynamic Multi-Point Application, Sep. 11, 1996.
Ehab S. Shaer et al, High-Performace Event Filtering for Distributed Dynamic Multi-Point Applications: Survey and Evaluation, 1997.
William Ford, Data Structure With C++, 1997.

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