Content based publish-and-subscribe system integrated in a...

Details Content based publish-and-subscribe system integrated in a... Content based publish-and-subscribe system integrated in a...

G - Physics

06

F

G06F 17/30 (2006.01)

Patent

CA 2379423

A method and apparatus are provided for implementing a content based publish- and-subscribe system in a relational database system. A subscriber may request for messages by using a query language supported by the database server. The queries are then used as subscription rules for determining whether an incoming message is to be sent to the subscriber. Evaluation of incoming messages against subscription rules involves a two-tier process. The first tier involves filtering out all the subscription rules that could not possibly apply to the incoming message. The second tier involves further evaluation of the incoming message, if needed, to determine which subscribers are to receive the incoming message. In another aspect of the embodiment, in cases where the publisher is the relational database system itself, queries that request for messages are not stored as subscription rules because publication of the messages is implicit.

L'invention concerne un procédé et un appareil permettant de mettre en oeuvre un système publication et abonnement basé sur le contenu dans un système de base de données relationnelles. Un abonné peut demander des messages en utilisant un langage d'interrogation pris en charge par un serveur de base de données. Les demandes sont ensuite utilisées comme règles d'abonnement permettant de déterminer si un message entrant doit être envoyé à l'abonné. L'évaluation des messages entrants suivant les règles d'abonnement nécessite un système à deux niveaux. Le premier niveau concerne le filtrage de toutes les règles d'abonnement qui ne pourraient probablement pas s'appliquer au message entrant. Le second niveau concerne, si nécessaire, l'évaluation plus approfondie du message entrant, afin de déterminer quels abonnés doivent recevoir le message entrant. Dans un autre mode de réalisation, lorsque l'éditeur est la base de données relationnelle elle-même, les requêtes de messages ne sont pas enregistrées en tant que règles d'abonnement car la publication des messages est implicite.

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