Publish and subscribe broker with multiple orthogonal topic trees

摘要

A publish subscribe broker according to the present invention comprises a broker receiving a message and two or more orthogonal message topics. In particular, the message is a publish message which indicates a publish to an intersection of the two or more topic branches on two or more separate topic trees. A subscription engine identifies all subscribers whose subscription topics match the two or more associated message topics. A message transmitter sends the message only to identified subscribers and not to subscribers having just one of the associated topics. The embodiments allow messages to be published to multiple orthogonal topics, and to allow subscribers in turn to subscribe to the intersection of these trees.