Domain-Driven Design

Strategic Domain-Driven Design

Motivation

Strategic Domain-Driven Design (DDD) is a methodology that emphasizes a shared understanding of the domain and promotes collaboration among different teams and stakeholders involved in the software development process. By focusing on the business domain and organizing software systems around bounded contexts, Strategic DDD can help teams reduce and manage dependencies between different parts of the system and between different teams.

One of the key benefits of Strategic DDD is that it encourages a clear separation of concerns between different parts of the system, which can help to reduce dependencies between those parts. By organizing code around well-defined business concepts, teams can ensure that each part of the system is responsible for a specific set of behaviors and interactions. This can reduce the risk of "spaghetti code" and minimize the need for teams to communicate and coordinate with each other when making changes to the system.

In addition, Strategic DDD can help to manage dependencies between teams by promoting collaboration and communication. By creating a shared language and understanding of the domain, teams can more easily work together to ensure that each part of the system is consistent and aligned with the overall business goals. This can reduce the risk of miscommunication, misunderstandings, and duplicated efforts.

Overall, Strategic DDD provides a framework for managing the complexity of software development by breaking down large systems into smaller, more manageable parts. By focusing on the business domain and promoting collaboration between different teams and stakeholders, Strategic DDD can help to reduce and manage dependencies between different parts of the system and between different teams, ultimately leading to a more cohesive and effective software development process.

Strategic Domain-Driven Design Strategies

1. Partnership: Teams from both contexts cooperate and evolve interfaces to accommodate the development needs of both contexts.

2. Shared Kernel: Both contexts share a common code base, and any modifications to the kernel are made after consulting the other team.

3. Customer-Supplier: Upstream team considers the downstream team's needs, and the relationship between the teams is formalized such that the upstream team is the supplier and the downstream team is the customer.

4. Conformist: Downstream team conforms to the model of the upstream team.

5. Anticorruption Layer: Downstream team creates an abstraction layer that protects the downstream context from changes in the upstream context, allowing the downstream team to work with a domain model that suits their needs.

6. Open Host Service: Access to a system is provided by clearly defined services, using a clearly defined protocol. The protocol is open so that anyone who needs to can integrate with the system.

7. Published Language: A documented language is used for the input and output of the system. There is no need to use a particular library or a particular implementation of a spec as long as you conform to the published language.

8. Separate Ways: The systems have evolved to a point where they are no longer related, and it is better to cut the contexts loose from each other and let them evolve independently.

Strategic Domain-Driven Design Cards will be designed and published soon.

Tactical Domain-Driven Design

Motivation

Tactical Domain-Driven Design (DDD) can help to manage dependencies in software projects by providing a set of principles and patterns for designing and organizing the codebase. By dividing the codebase into smaller, more manageable components based on the business domain, teams can reduce the dependencies between different parts of the system. This can be achieved by using concepts such as Bounded Contexts, Aggregates, and Domain Events, which can help to define clear boundaries between different parts of the system and minimize the interactions between them. By following these principles and patterns, teams can create a more modular, maintainable, and scalable system that is easier to understand and modify. Additionally, by ensuring that each component of the system is responsible for a specific set of behaviors and interactions, teams can reduce the need for cross-team communication and coordination when making changes to the system. Overall, tactical DDD provides a powerful framework for managing dependencies in software projects, and can help to improve the overall quality, flexibility, and maintainability of the codebase.

Tactical Domain-Driven Design Strategies

1. Bounded contexts: By defining and grouping related concepts into bounded contexts, tactical DDD can help identify and manage dependencies between different parts of the system.

2. Ubiquitous language: By creating a shared language and understanding of the domain, tactical DDD can help to reduce miscommunication and misunderstandings, and therefore minimize dependencies.

3. Context mapping: By creating a map of the relationships and interactions between different bounded contexts, tactical DDD can help identify potential dependencies and highlight areas where communication and coordination are necessary.

4. Aggregates: By grouping related entities and defining transaction boundaries, tactical DDD can help manage dependencies between different parts of the system and minimize the impact of changes to one part of the system on other parts.

5. Domain events: By using domain events to communicate changes and updates between different parts of the system, tactical DDD can help reduce dependencies and promote loose coupling between different components.

Tactival Domain-Driven Design Cards will be designed and published soon.