Writing
The Test Mediator and the Transport Spy
A Test Mediator and transport spy control delivery and expose observations while production gateways run. Capture email content, script retries, and measure bounded response reads.
Topic
Service Locator
A narrow factory that creates only what must be swappable, such as configuration, loggers and transport handlers, so tests can substitute them. Only the Manager uses it, and only during construction.
5 pages
Writing
Interfaces? No Thank You!
C# interfaces do not inherently create contracts or loose coupling. Composition handles hierarchy conflicts; capability interfaces and structural typing let consumers see only what they need.
Chapter
Architecture Layers in C#
Structure communicates intent: strict layers from Domain Facade to Gateway, internal by default with a public surface the compiler enforces, and folder depth that marks each class's level of abstraction.
Chapter
Architecture Layers in Python
Structure communicates intent: strict layers from Domain Facade to Gateway, a public surface declared in the boundary __init__.py, and folder depth that marks each class's level of abstraction.
PWI
Architecture with Intent
The Domain Facade exposes business operations while internal classes call one level down. Managers orchestrate workflows and own configuration and service boundaries.