Part 1 of 12 — Facts, rules, and notifications instead of polling; why OTP is a natural host for reactive rule engines, with Elixir examples from tec0301_pon. Tagged with elixir, otp, architecture, functional.

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Introduces the Notification-Oriented Paradigm (PON) and argues that Elixir on the BEAM is a natural fit for reactive rule engines. PON structures systems around facts (named state), rules (logic that reacts when watched facts change), and premises (derived facts), propagating work via notifications rather than polling. The post contrasts polling with notification-driven evaluation, explains why OTP primitives—lightweight processes, message passing, supervision—map cleanly onto PON concepts, and shows minimal API examples from the open-source tec0301_pon proof-of-concept. A DSL using defrule and defpremissa macros is previewed. This is Part 1 of a 12-part series that will cover OTP wiring, a metaprogrammed DSL, a Smart Brewery digital twin, LiveView, TimescaleDB, and performance lessons.

Notification-Oriented Paradigm (PON) in Elixir: why the BEAM fits reactive rules

PON in one picture: facts, rules, and premises

Polling vs notification-driven evaluation

Minimal API: facts and a rule (from tec0301_pon )