International Business Machines Corporation

David Postlethwaite

Ian C Edwards

Peter Siddall

Jonathan Lee Rumsey

David John McCann

Topics are linked in a publish/subscribe messaging environment. A first topic is linked to at least a second topic, and a message on the first topic is published to subscribers to the first topic. In the same transaction, any reference to the topics linked to the first topic are published in the message to subscribers of the topics linked to the first topic. A tree of topics is defined with topic nodes for each topic. A topic string is provided in a path through the tree of topics to a topic node, wherein the first topic and the at least a second topic have no commonality of topic string.

Linking topics in a publish/subscribe messaging environment

An apparatus for controlling subscriptions comprising: a detector operable to detect to a subscription associated with a wildcard topic string; and an analyzer, responsive to the detection of the subscription associated with a wildcard topic string and a topic string of a topic node matching the wildcard topic string, for analyzing a first attribute of the topic node; and means for determining whether a subscriber associated with the subscription should receive a message associated with the topic string of the topic node.

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Hampshire, United Kingdom

David Postlethwaite