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Why focusing on core areas can save your development project? Here are the truths you need to know!
As the complexity of software development continues to increase, the challenges faced by development teams are becoming increasingly important. Whether time is tight or requirements are changing, developers need to find a solution to make the project development process more efficient. At this time, Domain Driven Design (DDD) has become a popular strategy.
"Focusing on core areas is not a choice, but a necessity."
The most important concept of domain-driven design is to effectively connect the software model with the business domain. Through in-depth conversations with experts in the field, developers can understand the business logic and build software systems that not only meet user needs but can also be continuously maintained. The key to this approach is to focus on core areas rather than trying to solve all problems at once.
Through domain-driven design, we can divide large systems into several "bounded contexts", each with its own independent model. Such division helps development teams focus on specific functional areas and reduces interference across departments. At the same time, this also promotes creative collaboration between business experts and developers and enables them to iteratively revise concept models.
"The design of the model must correspond to business needs. This is the key to keeping the system easy to maintain."
Another benefit of using domain-driven design is that it emphasizes the importance of a unified language. The so-called ubiquitous language is a language used by business experts, users and developers, which can help ensure that all participants have a clear understanding of business requirements. Because everyone is communicating in the same context, communication errors can be effectively reduced and project progress can be promoted.
However, critics point out that implementing DDD requires a lot of isolation and encapsulation work in terms of model purity and helpfulness. This means that developers need to constantly maintain consistency within the model boundaries and treat future modifications as additional burden. Especially for smaller or less complex projects, this approach may result in unnecessary overhead. Therefore, Microsoft recommends adopting DDD only in complex domains where it is worthwhile when the model clearly provides a shared business understanding.
About model types
DDD recognizes that there are multiple models, the most common of which include entities and value objects. An entity is an object defined by its identity, whereas a value object is defined by its attributes and does not have a conceptual identity. For example, most airlines assign a unique number to each seat on an aircraft, which is the identity of the seat. In contrast, when people exchange business cards, they pay more attention to the information on the cards and do not pay special attention to the uniqueness of each card.
"Understanding different types of models is the cornerstone of mastering DDD."
Interact with the model
In DDD, the process of creating an object is often separated from the object itself. For example, a Repository is an object that has methods for retrieving domain objects from a data store such as a database. The factory is used to directly create domain objects. In addition, if a part of the program's functionality does not conceptually belong to any object, it can usually be expressed through a service.
Event Type
In DDD, events can be divided into multiple types, the most important of which are "domain events" and "integration events". Domain events signal important occurrences within a specific business domain, while integration events are used to communicate changes between different boundary contexts. Both play a vital role in ensuring system data consistency and business logic integrity.
Context Mapping Mode
Context Mapping is critical to identifying and defining the boundaries of different domains or sub-domains. It helps to visualize how these contexts interact and how they are related, thereby maintaining clear boundaries and reducing coupling.
Relationship of Domain Driven Design to Other Ideas
Although domain-driven design does not necessarily go hand in hand with object-oriented methods, in practice it does complement the strengths of these techniques. Different from traditional architecture, DDD focuses on business behavior rather than a specific technical framework.
SummaryWhether through methods such as Event Storming, Event Sourcing, or by mapping bounded contexts to microservices, DDD provides a series of tools and methods to help developers understand and implement business requirements. Ultimately, focusing on core areas not only increases the likelihood of project success, but also effectively reduces future maintenance costs. In this context, have you also begun to think about what kind of changes focusing on your core areas can bring to your development projects?
