Domain-Driven Design as a Software Design Approach

🔍 Definition — Domain-Driven Design (DDD) is a software design approach that focuses on modeling software to align with the business domain, using input from domain experts.

📚 Origin — The concept was introduced by Eric Evans in his 2003 book ‘Domain-Driven Design: Tackling Complexity in the Heart of Software’.

🗣️ Ubiquitous Language — DDD emphasizes the use of a common language shared by developers and domain experts to ensure clear communication and accurate representation of the domain.

📐 Bounded Contexts — DDD divides a large system into bounded contexts, each with its own model, to manage complexity and maintain clarity.

🤝 Collaboration — It involves close collaboration between technical and domain experts to iteratively refine a conceptual model that addresses specific domain problems.

Key Concepts

🏢 Domain — Refers to the specific business area or problem that the software system aims to address, such as banking or healthcare.

🗺️ Bounded Contexts — These are specific areas within a problem domain where a particular model or language is consistently used, helping to manage complexity.

🔄 Domain Events — Significant business events that trigger changes within the domain, used to communicate changes between different parts of the domain.

🔗 Aggregates — Clusters of domain objects treated as a single unit for data consistency, with one root entity known as the Aggregate Root.

📚 Ubiquitous Language — A shared vocabulary used consistently by all stakeholders to capture relevant domain knowledge and ensure clear communication.

Strategic Design

🗺️ Context Mapping — Defines relationships and interactions between different bounded contexts, ensuring effective communication and integration.

🔄 Shared Kernel — A strategic pattern identifying common areas between contexts, allowing collaboration while maintaining distinct models.

🛡️ Anti-Corruption Layer — Protects the system from external influences by acting as a translation layer between different models or languages.

📐 Strategic Patterns — Guidelines for organizing software architecture in alignment with the problem domain, addressing high-level concerns.

🔍 Focus — Strategic design focuses on defining the overall architecture and structure of a software system to align with the problem domain.

Tactical Design Patterns

🔍 Entity — A domain object with a distinct identity and lifecycle, characterized by unique identifiers and mutable state.

💼 Value Object — Represents a value that is conceptually unchangeable, lacking a unique identity, and used to describe attributes of entities.

🔗 Aggregate — A cluster of domain objects treated as a single unit for data consistency, with one entity as the aggregate root.

📦 Repository — Separates data access logic from the domain model, providing a consistent interface for querying and storing domain objects.

🔄 Domain Events — Represent significant business events that trigger transactions and changes within the domain.

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