International Business Machines Corporation

Loan Nguyen

Lap Thiet Huynh

Jon K Franks

Diane Iupe Shannon

Gregory M Callis

David Yu Pin Yang

Embodiments of the present invention include methods, systems and computer program products which provide for processing an event having a classification based on associated policy rules where the policy rules are conditioned on the classification. A policy rules hash table is provided including a plurality of policy rule entries, each policy rule entry being associated with a hash index. A hash index is generated using a classification hash length based on the classification of the event, the classification having an associated length at least equal to the classification hash length. A policy rule entry in the policy rules hash table is identified that corresponds to the generated hash index. It is determined if a classification field length associated with the identified policy rule corresponds to the classification hash length. The identified policy rule entry is executed if the hash length associated with the identified policy rule corresponds to the classification hash length.

Methods systems and computer program products for processing an event based on policy rules using hashing

Embodiments of the present invention include methods, systems and computer program products which provide for a complex policy rule structured in a plurality of levels wherein the complex policy rule selects an action for execution based on a plurality of individual policy conditions. An event is received having an associated value defining a point in a space covered by the individual policy conditions. The following operations are performed if the complex policy rule is a CNF policy rule. A plurality of summary conditions are generated, each of the summary conditions being associated with one of the levels. The associated value of the received event is compared to a selected one of the summary conditions to determine if the selected one of the summary conditions is met. Operations repeat for others of the summary conditions and individual policy conditions until either one of the summary conditions is not met or all individual policy conditions for one of the levels are not met, allowing the policy rule to be skipped, or until at least one of the individual policy conditions for each level is met. DNF policy rule processing is also provided.

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Durham, NC, United States of America

Loan Nguyen