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What is the publish/subscribe model?


The publish/subscribe model is an approach to distributed
system communication in which publishers publish information
to a subject address and subscribers subscribe to
information at a subject address. The publish/subscribe
model has the benefit of making publishers independent of
location. This enables subscribers to subscribe to
information without having to know the location of a publisher.

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What are the Design Patterns you know explain?Dd you use OOA/OOD methodologies? Did you use design patterns?