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We have a system consisting of

  • Detectors
  • Converters/Transformers
  • Business Rules Engines and State Managers
  • Views/Displays/Applications

There are several potential ways these may interact and share state

  • Message passing mediated by Queues
  • Point to Point Message Passing via Http
  • Shared State in a Database/Datastore and state-change notifications via messaging

I am drawing up a simplistic flow-chart / system diagram and am wondering how best to represent the publish-subscribe or notifier/listener(s) mechansisms. I do not recall standardized flowchart symbols for these.

An example would be:

1  A Parts Modification detection event occurs

2  Events are written to `Events` and `Parts_State` topics (or possibly tables)

3  A State_Management module that listens on those topics performs validations and 
   transformations then updates downstream topics with the results

What I am looking for is how to represent the Publisher/Notifier aspect of the Detection module in the Flowchart and the Subscriber/Listener aspect of the State_Management module in the flowchart.

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  • Flowcharts were invented before pub/sub architecture was invented. There are no standard symbols. You can borrow from another standard for that. – Berin Loritsch Mar 23 '20 at 13:26
  • OK .. any recommendations ? – StephenBoesch Mar 23 '20 at 15:32

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