International Business Machines Corporation

Andrew Stephen Marcus Edwards

Martin Andrew Ross

Andrew Ian Hickson

Trevor Lobban

Martin R Holder

A method and related system to concurrently process a temporal message stream. The method comprises obtaining messages of a message stream, each message having an associated timestamp. The method further comprises storing each message in at least one of a plurality of queues, wherein the messages of each queue are ordered based on their timestamp such that a message with the earliest timestamp is positioned at the front of the queue. The method then comprises controlling retrieval of the target message from the front of a target queue based on a timing difference between the timestamp of the message and the timestamps of the front message of each of the other queues of the plurality of queues.

Processing of a message stream

Documents are published in a publish subscribe data processing system. A first document to be published may have an associated topic. The first document is retained as a retained document. A second document to be published is retained as the retained document in response to receiving the second document before a predetermined time interval has passed. A copy of the second document is sent to a subscriber of the topic. A copy of the retained document is sent to the subscriber of the topic in response to a determination that the predetermined time interval has passed.

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Southampton, United Kingdom

Andrew Stephen Marcus Edwards