ECA (Event - Condition - Action): New rules engine for Drupal 9+

Inspired by BPMN (www.bpmn.org) and a customer's requirement to migrate from Drupal 7 to 9 for sites with extensive use of rules, we investigated possible ways forward and built a proof of concept for a brand-new engine in Drupal 9 to process events based on BPMN models. Turned out to be more than a PoC and turned into a set of modules publicly available on drupal.org - this presentation will demonstrate this in action and explain the architecture behind it.