The application and introduction of the Kurgan framework in the Java library
The application and introduction of the Kurgan framework in the Java library
Kurgan is a Java-based lightweight dependency injection (Dependency Inject) and Aspect-Oriented Programming framework.It provides a simple and flexible way to manage the dependencies in the application and allow the Cross-Cutting Concerns to be separated from the core business logic.This article will introduce the application and basic usage of the Kurgan framework in the Java class library.
1. Installation of the Kurgan framework
To use the Kurgan framework, you need to add it to the class path of the Java application.This step can be completed by adding the following dependencies by adding the following dependencies by adding the following files (such as Maven's pom.xml):
<dependency>
<groupId>com.kurgan.framework</groupId>
<artifactId>kurgan-core</artifactId>
<version>1.0.0</version>
</dependency>
2. Dependency Injection
Dependent injection is one of the core functions of the Kurgan framework.It allows the dependence of one object into another object without the need to create them without explicitly.Below is a simple example, showing how to apply dependency injection in the Java class:
public class EmailService {
private Logger logger;
@Inject
public EmailService(Logger logger) {
this.logger = logger;
}
public void sendEmail(String message) {
logger.log("Sending email: " + message);
// Specific email logic
}
}
// Use EmailService in another class
public class UserService {
private EmailService emailService;
@Inject
public UserService(EmailService emailService) {
this.emailService = emailService;
}
public void registerUser(String username, String email) {
// The logic of registered users
EmailService.sendemail ("Welcome to become our new user!");
}
}
In the above example, the constructor of the EmailService class uses the `@inject` annotation to identify the logger object to be injected.Similarly, the constructor of the UserService class uses the `@inject` annotation to identify the EmailService object to be injected.When creating UserService objects, the Kurgan framework will be responsible for automatic analysis of the dependent relationship between objects and inject the required objects.
3. ASPECT-Oriented Programming
The Kurgan framework also provides support for cut -oriented programming, so that non -business attention points (such as log records, transaction management, etc.) can be separated from core business logic.The following is a simple example that shows how to use cut -oriented programming in the Java class:
public class LoggingAspect {
@Before("execution(public void com.example.UserService.registerUser(String, String))")
public void logBeforeRegisterUser(JoinPoint joinPoint) {
System.out.println ("registered user ...");
}
@After("execution(public void com.example.UserService.registerUser(String, String))")
public void logAfterRegisterUser(JoinPoint joinPoint) {
System.out.println ("Successful user registration!");
}
}
// UserService class is the same as
// Use aspectj annuity configuration
@Aspect
public class TransactionAspect {
@Before("execution(public void com.example.UserService.registerUser(String, String))")
public void beginTransaction(JoinPoint joinPoint) {
System.out.println ("Starting transaction ...");
}
@After("execution(public void com.example.UserService.registerUser(String, String))")
public void commitTransaction(JoinPoint joinPoint) {
System.out.println ("Submit transaction ...");
}
}
In the above example, the loggingaspect class and the TransactionAspect class use ASPECTJ annotation to define the cut surface (ASPECT).Before and after the userService class of the registerUser method, the cut surface will be executed separately.Similarly, before and after the userService class of the Registeruser method, the cut surface will execute the `Begintraction` and the 'Committransactions.
By using the Kurgan framework, we can easily apply the concept of dependent injection and cut -off programming in the Java library.It enables us to better manage the components of the coupling application and extract cross -sectional attention points from the core business logic.It is hoped that this article will help understand the application and basic usage of the Kurgan framework.
