Common annotation analysis in Annotations for DS framework

In the DS framework (dependency injection), the annotation is a special mark for providing metadata.By using annotations, developers can specify how the class, methods, fields, or parameters should be handled or configured.In this article, we will explore common annotations in the DS framework and provide Java code examples. 1. `@Component` Note: This is one of the most commonly used annotations, which is used to mark a class as a component.The class marked by the annotation of the@Component` will be scanned and registered as an available component. @Component public class MyComponent { // ... } 2. `@Reference` Note: This annotation is used to declare the dependence on another component in one component.The DS framework will automatically analyze and inject the required dependencies based on the settings of the `@Reference`. @Component public class MyComponent { @Reference private AnotherComponent anotherComponent; // ... } 3. `@Activate` Note: Through the`@Activate` annotation, developers can specify when and how to activate a component.You can set conditions or sorting rules to control the activation order of the component. @Component @Activate public class MyComponent { // ... } 4. `@modified` Note: This annotation is used to mark the method to call when the component configuration changes.When the configuration of the component dependencies is changed, the DS framework will trigger this method. @Component public class MyComponent { @Modified public void modified() { // handle configuration changes } } 5. `@Service` Note: Using the`@Service` annotation can mark a component as a service, so that it can provide specific functions or interfaces to other components. @Component @Service public class MyService implements SomeInterface { // ... } 6. `@Property` Note: Through the`@Property` annotation, developers can add attributes to components.These attributes can be dynamically configured at runtime. @Component public class MyComponent { @Property(name = "my.property", value = "some-value") private String myProperty; // ... } 7. `@ConfigurationPolicy` Note: This annotation is used to specify the configuration strategy of a component.It can be set to `ConfigurationPolicy.require`, indicating that the component needs to be explicitly configured to be activated. @Component(configurationPolicy = ConfigurationPolicy.REQUIRE) public class MyComponent { // ... } Summarize: The annotation in the DS framework is a powerful tool that makes the dependencies and configuration between components simple and flexible.By using these commonly used annotations, developers can better define and manage components, and make applications have higher scalability and maintenance.It is hoped that the code examples provided in this article can help readers better understand how to use these annotations.