DannTeil

DannTeil is a software architecture pattern intended to structure complex information systems by separating decision logic from execution components. The term is a coined compound drawing on German roots, intended to convey a two-part decomposition: a layer that decides what to do, and a layer that implements the chosen action. In practice, DannTeil describes a modular approach in which a central decision layer coordinates a set of interchangeable execution units.

The pattern consists of two primary layers. The Dann layer handles contextual inference, policy evaluation, routing, and orchestration. It analyzes inputs, determines appropriate strategies or tasks, and selects which Teil components should be activated. The Teil layer comprises modular, pluggable components that implement concrete functionality and can be added, removed, or updated without altering the decision logic. A lightweight orchestrator or dispatcher mediates communication between layers and enforces interface contracts.

DannTeil is commonly realized in environments that favor plug-in architectures, microkernel designs, or service orchestration. Implementations may use event-driven messaging, command queues, or lightweight remote procedure calls to connect the decision engine with execution modules. The pattern supports runtime reconfiguration, plugin hot-swapping, and clear separation of concerns, which can simplify testing and future evolution of the system.

Advantages of DannTeil include increased modularity, improved testability, and greater flexibility in adapting behavior without changing core code. Potential drawbacks involve orchestration overhead, added state management requirements, and the need for disciplined interface design and governance to avoid tight coupling between layers. See also: mediator pattern, plugin architecture, event-driven architecture.