Crème de la Crem: Composable Representable Executable Machines (Architectural Pearl)
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In this paper we describe how to build software architectures as a composition of state machines, using ideas and principles from the field of Domain-Driven Design. By definition, our approach is modular, allowing one to compose independent subcomponents to create bigger systems, and representable, allowing the implementation of a system to be kept in sync with its graphical representation. In addition to the design itself we introduce the Crem library, which provides a concrete state machine implementation that is both compositional and representable, Crem uses Haskell's advanced type-level features to allow users to specify allowed and forbidden state transitions, and to encode complex state machine – and therefore domain-specific – properties. Moreover, since Crem's state machines are representable, Crem can automatically generate graphical representations of systems from their domain implementations.
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