Event notification channel between supplier and consumer objects in object oriented programming system with proxy consumer objects to maintain uninterrupted event transmission during consumer object off line maintenance

Abstract

An event notification channel is provided in a computer controlled object oriented programming system having at least one event supplier object and a plurality of event consumer objects which may be run continuously without interruption and without loss of event notification to any consumer object irrespective of whether any of the consumer objects are off line for filter modification or any other maintenance purpose. The channel transmits events from supplier objects to a plurality of filter objects, each respectively associated with one of the plurality of consumer objects for passing only selected events to the associated consumer object. The system includes a plurality of proxy consumer objects, each associated with one of said consumer objects and between said filter object and said supplier object, whereby said proxy consumer object may receive supplier transmitted events on behalf of its associated consumer object. Thus, where the actual consumer object is off line for filter modification, the proxy will remain in the system and receive the transmitted events.