You could find some relevant material in Concurrent Data Processing in Elixir (PragProg).
In addition to Gestate and Flow, the book discusses Broadway. According to the book, Broadway “offers a convenient way to build data-ingestion pipelines that consume events from external message brokers, like RabbitMQ, Apache Kafka, Amazon SQS, and more”.
I have to admit that although I have not read the book myself yet, but it is certainly relevant to your interests.
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