International Business Machines Corporation

Vicente Rosselli Suarez

Graham Derek Wallis

Ian Westbrook Parkinson

The order of messages in an asynchronous message system is preserved, by generating a message and tagging the generated message with a sequence identifier and a sequence number. The order of messages is further preserved by processing the tagged message by checking a log to determine whether the sequence identifier is in the log, sending the tagged message to a selected consumer if the sequence identifier is not in the log and sending the tagged message to a particular consumer if the sequence identifier is in the log. Still further, the order of messages is preserved by writing an entry to the log having the sequence identifier and the sequence number of the tagged message and a consumer identifier of the selected consumer if the sequence identifier of the tagged message is not in the log.

System for preserving message order

Order associated with messages is preserved in an environment wherein a message includes an associated order identifier; a receiver is operable to receive a first message associated with a first order identifier and a selection component is operable to select a first entity for processing the first message. The system includes a determination component for determining whether a notification associated with completion of processing of the first message has been received by the receiver; and a controller for controlling the selection component to select a second entity for processing the second message, in response to a combination of receipt of the notification and a second message associated with the first identifier being received by the receiver preceding the receipt of the notification.

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Berkshire, United Kingdom

Vicente Rosselli Suarez