问题描述
属性是一个非常流行的功能. Java在1.5之后添加了注释注释在任何地方都可以使用，请参阅Java EE和Spring.但是很少有Scala库使用注释.lift-json不要使用它.提升记录不要使用它.Squeryl不使用它.subcut不要使用它(它具有编译器插件的注释)...仅举几例.
Attribute in .NET is a very popular feature. And Java added Annotation after 1.5Annotations are used everywhere, see Java EE and Spring.But few scala library use annotation.lift-json don't use it.lift-record don't use it.Squeryl don't use it.subcut don't use it.(it has annotation for compiler plugin)...Just named a few.
仅当需要一些编译器魔术时，才使用注释.@ tailrec，@ inline，@ BeanProperty，@ Inject(在子切口中)...
They use annotation only when they need some compiler magic.@tailrec, @inline, @BeanProperty, @Inject(in subcut) ...
Scala具有超级灵活的类型系统，特征，隐式和Menifest [X].所以他们不需要运行时元数据吗?
Scala has super flexible type system, trait, implicit and Menifest[X]. So they don't need runtime meta-data?
是否有任何scala项目都使用注解?
Is there any scala project use annotation heavily?
p.s.我认为动态应该是注解，而不是特征.
p.s. I think the Dynamic should be annotation but not trait.
推荐答案
通常，我们不使用注释，因为我们实际上并不需要很多东西.
In general, we don't use annotations because we don't really need them for a lot of things.
我见过使用注解的几个地方:
The few places I've seen annotations used:
- 其他类型的系统(例如，用于定界延续的CPS插件或效果跟踪插件.
- 与旧版Java接口的接口. ( scala-mojo-support )
- 强制执行/启用编译器优化，例如
@inline或@tailrec.
- Extra type systems (e.g. the CPS plugin for delimited continuations or the effect tracking plugin.
- Interfacing with legacy Java interfaces. (scala-mojo-support)
- Enforcing/enabling compiler optimisations, like
@inlineor@tailrec.
在Scala中，我们实际上并不需要依赖注入框架，因为有几种方法可以执行不需要外部工具的依赖注入.您可以将DI配置与核心代码分开，但是仍然可以用Scala编写.请参阅: https://github.com/jsuereth/scala-in-depth-source/blob/master/chapter11/src/main/scala/scalax/config/Test.scala
In Scala, we don't really need a dependency injection framework, as there's a few ways to do dependency injection that doesn't require an external tool. You can have the DI config separate from core code, but still be written in Scala. See: https://github.com/jsuereth/scala-in-depth-source/blob/master/chapter11/src/main/scala/scalax/config/Test.scala
因此，基本的答案是，注解没有什么问题，我们只是不需要那么频繁了.
So the basic answer is, there's nothing wrong with annotations, we just don't need them that often (yet).
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