CONTROLLING MESSAGE DELIVERY IN PUBLISH/SUBSCRIBE MESSAGING

摘要

A messaging system and method of controlling message delivery between one or more publisher applications (31) and one or more subscriber applications (32) includes a topic manager (40) with which subscriptions to specified topics can be registered for named subscriber applications by registration means (41). In response to publication of a message on a specified topic to the system by a publisher application, it is determined (63) by matching means (45) whether or not any subscriber applications are registered for that topic. If any subscriber applications are so registered, the published topic message is delivered (65) by delivery means (46) to such registered subscriber applications. If no subscriber applications are registered for the specified topic, the specified topic message is stored in a buffer store (51) and, in response to receipt of a subsequent subscription request (80) in respect of a new subscriber application for said topic, is delivered (87) to said new subscriber application.