Onion Architecture is a software design pattern that advocates for separating concerns into distinct layers, with the core business logic residing at the very center. This central core is independent of any external concerns like databases, UI frameworks, or external services. Layers represent different levels of …

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The Repository pattern provides an abstraction layer between the domain logic and the data access layer. It encapsulates the complexities of data access, allowing the domain to work with objects without knowing how they are stored or retrieved. This promotes loose coupling, making the application easier to test, …

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Single Table Inheritance is a strategy for representing a class hierarchy in a relational database using only one table for all classes in the hierarchy. A “type” column (or discriminator) is added to the table to indicate the specific class of each record. This approach simplifies querying and joins compared to other …

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The Specification pattern encapsulates business rules in objects, allowing for dynamic combinations and reuse. It’s a way to separate complex logic concerning data from the objects that hold that data. This enables you to define a variety of rules, combine them, and then apply these rules to objects without directly …

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The Strategy Registry pattern provides a centralized way to manage and access a collection of strategy algorithms. Instead of a client directly holding references to multiple concrete strategy classes, it interacts with a registry that maps keys (often strings or enums) to specific strategies. This promotes loose …

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The View Store pattern acts as a mediator between a View (UI) and the underlying application State. It centralizes the logic for preparing data from the State into a ViewModel specifically tailored for the View’s needs. Crucially, it also handles user-generated Events from the View, dispatching them to a Reducer …

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The Domain Service pattern encapsulates complex domain logic that doesn’t naturally belong to any specific entity or value object. It serves as a central point for operations that involve multiple entities or intricate business rules, preventing these behaviors from cluttering up the domain model. This keeps entities …

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The Entity pattern represents a real-world object with a distinct identity that persists over time. Entities are defined by their attributes and behaviors, but crucially, they are distinguished from Value Objects by having a unique identifier (ID) that remains constant even if their attributes change. This identity …

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A Bounded Context is a central concept in Domain-Driven Design. It defines an explicit boundary within which a particular domain model applies. Within a Bounded Context, a specific set of terms and concepts have a precise and consistent meaning. Outside that boundary, those terms may have different meanings, or be …

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Event Sourcing is a pattern where the state of an application is determined not by directly storing the current state, but by storing a sequence of all the changes (events) that have occurred. Instead of asking “what is the data now?” you ask “what happened then?” and rebuild the state from the …

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