Managing a message subscription in a publish/subscribe messaging system

摘要

A method and computer program product is disclosed for managing a message broker and subscriber application programs in a publish/subscribe messaging system so as to maintain the state of the subscriber application program on the broker subscriber application program.

主权项

1. A method for managing a message subscription in a message subscription application program of a publish/subscribe messaging system, the method comprising:
subscribing, via a message subscriber, to a subscription provided in parallel by each of a set of message brokers, said subscription comprising a common sequence of messages, each common message being associated with a common sequential message identifier (SMI); retrieving a message from a selected one of said message brokers and triggering a saving of the associated common SMI for said subscription at said message broker; in response to a restart of said message subscriber, determining whether all of said message brokers are available, and when all of said message brokers are not available, reverting to said set of message brokers to determine a latest saved SMI for said subscription at any one of said message brokers; and resuming said subscription by requesting a subsequent message associated with said latest saved SMI, from a selected one of said message brokers.