International Business Machines Corporation

David John McCann

Andrew Ian Hickson

Ian C Edwards

David Postlethwaite

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

A method for deleting expired items in a queue data structure, the queue data structure comprising a sequential list of ordered data items including a queue head at one end of the sequential list and a queue tail at another end of the sequential list, wherein each data item includes an expiry time, the method comprising: generating a maximum interval value corresponding to a maximum time interval between an expiry time of a first item in the queue and an expiry time of a second item in the queue, wherein the second item is nearer the queue head than the first item; sequentially scanning the list of ordered items from the queue head; responsive to a determination that a scanned item is expired, deleting the scanned item; responsive to a determination that a scanned item will not expire for a time interval greater than the maximum interval value, terminating scanning of the list of ordered items.

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Southampton, United Kingdom

David John McCann