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Should repositories return DTOs?
Short answer: No. Long answer: repository is responsible for turning persisted data back to entities (models) and vice versa. Model is a business Model representing a business entity.
What is DTO layer in Java?
In the field of programming a data transfer object (DTO) is an object that carries data between processes. In other words, DTOs are simple objects that should not contain any business logic but may contain serialization and deserialization mechanisms for transferring data over the wire.
What should repositories return?
As the repository is an abstraction, it should always return whatever the layer above wants to work with, which in most cases are domain entities, i.e., the objects which will encapsulate the logic in your business code.
Why do we need CQRS pattern?
CQRS is a popular architecture pattern because it addresses a common problem to most enterprise applications. Separating write behavior from read behavior, which the essence of the CQRS architectural pattern, provides stability and scalability to enterprise applications while also improving overall performance.
What is the CQRS pattern in azure Architecture Center?
Community resources CQRS stands for Command and Query Responsibility Segregation, a pattern that separates read and update operations for a data store. Implementing CQRS in your application can maximize its performance, scalability, and security.
When to use the CQRS pattern in an application?
That’s simple and works well for basic CRUD operations. In more complex applications, however, this approach can become unwieldy. For example, on the read side, the application may perform many different queries, returning data transfer objects (DTOs) with different shapes. Object mapping can become complicated.
How is CQRS used in task based user interfaces?
CQRS allows you to define commands with enough granularity to minimize merge conflicts at the domain level, and conflicts that do arise can be merged by the command. Task-based user interfaces where users are guided through a complex process as a series of steps or with complex domain models.
Why is it important to use CQRS in collaborative domains?
Collaborative domains where many users access the same data in parallel. CQRS allows you to define commands with enough granularity to minimize merge conflicts at the domain level, and conflicts that do arise can be merged by the command.