designing a sane pubsub system

Dear Group,

I'm working on a large-ish project that implements the MVC pattern. I use 
only pubsub for messaging between the components.

Building a sane pubsub system is something I struggle with - I always have 
the feeling that it lacks a basic idea and until now I could not find a 
basic principle or structure I can follow. Thus the pubsub system tends to 
be a seemingly random, tangled mess connecting the parts of a system with a 
quite clean design.

I'm aware that the question I ask is a very general one that can't be 
answered in a few words. Do you know of any source on basic ideas or 
recommendations for the design of a pubsub system?

Thanks in advance for any ideas.

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