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Subscription propagation enables efficient content-based routing in publish/subscribe systems and is a challenging problem when it is required to support reliable delivery in networks with redundant routes. We have designed a generic model and a highly-asynchronous algorithm accomplishing these goals. Existing algorithms can be interpreted as different encodings and optimizations of the generic algorithm and hence their correctness can be derived from the generic algorithm.

With the emergence of the internet, independent applications are starting to be integrated with each other. This has created a need for technology for glueing together applications both within and across organizations, without having to re-engineer individual components. We propose an approach for developing this glue technology based on message flows and discuss the open research problems in realizing this approach.