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Posted to notifications@dubbo.apache.org by GitBox <gi...@apache.org> on 2022/07/01 15:29:40 UTC
[GitHub] [dubbo] 6westboy9 opened a new issue, #10255: `@Adaptive`注解标注在类上有什么特别之处？
6westboy9 opened a new issue, #10255:
URL: https://github.com/apache/dubbo/issues/10255
```
ExtensionLoader(Class<?> type, ExtensionDirector extensionDirector, ScopeModel scopeModel) {
this.type = type;
this.extensionDirector = extensionDirector;
this.extensionPostProcessors = extensionDirector.getExtensionPostProcessors();
initInstantiationStrategy();
this.injector = (type == ExtensionInjector.class ? null :
extensionDirector.getExtensionLoader(ExtensionInjector.class).getAdaptiveExtension()); // ①
this.activateComparator = new ActivateComparator(extensionDirector);
this.scopeModel = scopeModel;
}
```
为什么①处不直接使用`this.injector = (type == ExtensionInjector.class ? null :
extensionDirector.getExtensionLoader(ExtensionInjector.class).getExtension("adaptive"));`呢？不太明白`@Adaptive`注解标注在类上有什么特别之处？
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[GitHub] [dubbo] Trying-hc commented on issue #10255: `@Adaptive`注解标注在类上有什么特别之处？
Posted by GitBox <gi...@apache.org>.
Trying-hc commented on issue #10255:
URL: https://github.com/apache/dubbo/issues/10255#issuecomment-1179459784
我的理解是，使用@Adaptive标注类而非通过getExtension指定类有以下好处：
1. 自定义扩展：像AdaptiveExtensionInjector、AdaptiveCompiler这些使用@Adaptive标注的类，其内部并没有实现具体的业务逻辑，而是通过一些逻辑调用其他的拓展类，可以满足一些通过方法标注@Adaptive不能实现的拓展逻辑。
2. 方便理解调用：使用@Adaptive标注类可以让人知道这是静态拓展，约定俗成。而直接指定拓展类则无这层语义。
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[GitHub] [dubbo] wangzhenxyz1 commented on issue #10255: `@Adaptive`注解标注在类上有什么特别之处？
Posted by GitBox <gi...@apache.org>.
wangzhenxyz1 commented on issue #10255:
URL: https://github.com/apache/dubbo/issues/10255#issuecomment-1174503864
dubbo的扩展点，一般是注解在方法上，根据url获取扩展信息，背后就是通过javassist动态生成代码并编译加载，如果是注解在类上的话，表明此扩展点为静态扩展，逻辑就在当前代码里
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