This publication explores the properties of asynchronous architectures built with actors or event-driven services. The cycle covers complexity, distributability, and variants of actors. It also delves into handling messages, control and data flow, simple systems, systems with models, and fragmented systems. Actors have existed since 1973 and appeared to have been recently reinvented due to modern event-driven architectures. The wider adaptation of objects made it easier to write business logic as synchronous method calls, but actors may serve as an intuitive model for regaining system structure and properties. This article also outlines the characteristics of an actor, such as being a finite-state machine that reacts to incoming messages and having private memory ownership. Overall, this publication emphasizes the importance of defining a systems structure and applicability before implementation details.
