In-depth design principles and architecture patterns of the Jakartaee API framework
In -depth exploring the design principles and architecture mode of the Jakartaee API framework
Overview:
Jakartaee (previously known as Javaee) is a platform for developing enterprise -level Java applications.It provides Java developers with API for enterprise -level applications for reliable, scalable and secure enterprise applications.When designing the Jakartaee API framework, it follows some key design principles and architecture modes. These principles and modes help developers to build high -quality enterprise -level applications.
Design Principles:
1. Single Responsibility Principle:
Jakartaee's API framework follows the principle of a single responsibility, that is, each API module focuses on providing specific functions for specific business goals.This means that each API module should be responsible for a clear task to avoid mixing multiple attention points in one module.This modular design allows different parts of enterprise applications to develop, test and maintain independently.
2. Open and Closed Principle:
Jakartaee's API framework supports the principle of opening and closing, that is, expansion and opening up, and turning off.This means that when the requirements of the application change, developers can meet these needs by adding new API modules instead of modifying existing modules.By following this principle, applications can easier to adapt to new functional needs while maintaining the stability and compatibility of existing modules.
3. Interface Segregation Principle:
The API framework of Jakartaee ensures the loose coupling between the modules through the principle of interface isolation.This means that the API module should provide accurate interfaces to meet the needs of specific modules.This design allows different modules of the application to develop, deploy and upgrade independently, thereby improving the flexibility and maintenance of development.
Architecture mode:
1. Layered Architecture Pattern:
The API framework of Jakartaee uses a layered architecture mode to divide different components of the application into different layers.The typical levels include the presentation layer, the business logic layer (Business Logic Layer) and the data access layer.This architecture mode allows applications to better organize and manage, while achieving logical separation and reuse.
Example code:
The following is a simple example code that shows how to use Jakartaee's API for enterprise -level applications.Assuming that we are developing an online shopping website, we need to realize user registration functions:
import javax.annotation.Resource;
import javax.enterprise.context.RequestScoped;
import javax.inject.Named;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.transaction.Transactional;
@Named
@RequestScoped
public class RegistrationController {
@PersistenceContext(unitName = "myPersistenceUnit")
private EntityManager entityManager;
@Resource
private UserValidator userValidator;
@Transactional
public String register(User user) {
if (userValidator.validate(user)) {
entityManager.persist(user);
return "success";
} else {
return "error";
}
}
// Other auxiliary methods and attributes
}
public interface UserValidator {
boolean validate(User user);
}
In the above example, the registrationController is responsible for handling the logic of user registration.It uses the annotations provided by the API of Jakartaee to manage affairs and entity managers in order to perform database operations.In addition, it also injected an implementation class of the UserValidator interface to verify the effectiveness of the user input.In this way, when the user is registered, the user information can be verified by calling the value method, and the user information is decided to persist in the database (successful situation) or the error information (failed) based on the verification results.
Summarize:
This article deeply explores the design principles and architecture mode of the Jakartaee API framework.The design principles include a single responsibilities principle, the principle of opening and closing, and the interface isolation principle. These principles ensure the independence, scalability and maintenance of the module.In addition, the layered architecture mode is widely used in the development of the Jakartaee application. It divides the different components of the application into different levels and realizes logical separation and reuse.By following these design principles and architecture models, developers can build high -quality enterprise applications.
