Apache Yetus Audience Annotations framework in the Java Library An Analysis of Real-WORLD Applications of Apache Yetus Audiences Framework In Java Class. s libraries)

Apache Yetus Audience Annotations is part of the Apache Yetus project, which is used to mark a specific audience in the Java library.This article will analyze the real application example of Apache Yetus Audience Annotations in the Java library and provide the necessary Java code examples. Apache Yetus is a collection of open source tools for the development of software projects, which aims to provide the function of automation, standardization and quality assurance during software development.Among them, the Audience Annotations framework is to mark specific audiences in the code in order to better understand the use and constraints of the code. There are many practical application scenarios in the Java library using Apache Yetus Audience Annotations framework.The following will introduce these scenarios and provide corresponding code examples. 1. Edition compatibility: When developing a library, compatibility between different Java versions often needs to be considered.Use@interfaces of different interfaces or classes to use the annotation of `@interface.In this way, other developers can clearly know which interfaces can only be used in specific JDK versions when using this type of library. The example code is as follows: @InterfaceAudience.Public public class MyLibrary { //... } 2. Internal API usage constraints: When developing libraries, some APIs are only designed for internal use and do not want to be called external calls.Using the `@interface.private` annotation can mark these APIs and prevent other developers from being misused. The example code is as follows: @InterfaceAudience.Private public void internalApi() { //... } 3. Expansion limit: Sometimes, some methods or classes of the class library can only be extended or inherited in specific scenarios. Using the `@interfaceAudience.limitedprivate` annotation can limit the scope of these scalables. The example code is as follows: @InterfaceAudience.LimitedPrivate({"Extension"}) public class MyLibrary { //... } 4. Internal implementation details: In the Java class library, some classes or methods exist for the details of the internal implementation, and do not want to be directly called by the developer.Use the@interface.limitedprivate` and@interfacestability.unstable` annotations to mark these classes or methods. The example code is as follows: @InterfaceAudience.LimitedPrivate({"Implementation"}) @InterfaceStability.Unstable public void internalDetail() { //... } 5. Public API stability: In the Java class library, some public APIs are used for other developers and hope to stabilize.Use the@interface.public` and@interfacestability.stable` annotations to mark these public APIs. The example code is as follows: @InterfaceAudience.Public @InterfaceStability.Stable public void publicApi() { //... } The above is the actual application example of the Apache Yetus Audience Annotations framework in the Java library.By using the Audience Annotations framework, developers can better understand the use of code use and provide better API documents and version compatibility descriptions.