是否可以在@RequiredArgsConstructor(onConstructor = @__(@ Autowired))中添加限定词? [英] Is it possible to add qualifiers in @RequiredArgsConstructor(onConstructor = @__(@Autowired))?

问题描述

如果我想在构造函数依赖项注入中使用注释 @Qualifier ，我将具有以下内容:

If I wanted to use the annotation @Qualifier on a constructor dependency injection, I would have something like the following:

public class Example {

    private final ComponentExample component;

    @Autowired
    public Example(@Qualifier("someComponent") ComponentExample component) {
        this.component = component;
    }
}

我知道Lombok的注释可以减少样板代码，并且不必包含构造函数，如下所示: @RequiredArgsConstructors(onConstructor = @ __(@ Inject))但这仅适用于属性没有预选赛.

I know Lombok's annotations to reduce boilerplate code and don't have to include a constructor would be as follows: @RequiredArgsConstructors(onConstructor=@__(@Inject)) but this only works with properties without qualifiers.

任何人都知道是否可以在 @RequiredArgsConstructor(onConstructor = @__(@ Autowired))中添加限定符吗?

Anyone know if it is possible to add qualifiers in @RequiredArgsConstructor(onConstructor = @__(@Autowired))?

推荐答案

这样做是最后 可能！您可以定义如下服务:

It is FINALLY POSSIBLE to do so! You can have a service defined like this:

@Service
@RequiredArgsConstructor
public class SomeRouterService {

   @NonNull private final DispatcherService dispatcherService;
   @Qualifier("someDestination1") @NonNull private final SomeDestination someDestination1;
   @Qualifier("someDestination2") @NonNull private final SomeDestination someDestination2;

   public void onMessage(Message message) {
       //..some code to route stuff based on something to either destination1 or destination2
   }

 } 

在项目的根目录中提供了一个像这样的lombok.config文件:

Provided that you have a lombok.config file like this in the root of the project:

# Copy the Qualifier annotation from the instance variables to the constructor
# see https://github.com/rzwitserloot/lombok/issues/745
lombok.copyableAnnotations += org.springframework.beans.factory.annotation.Qualifier

这是最近在最新的lombok 1.18.4中引入的，我在博客中写道.我很自豪地说我是推动该功能实现的主要推动力之一.

This was recently introduced in latest lombok 1.18.4, I wrote about it in my blogpost, and I am proud to say I was one of the main driving forces pushing for the implementation of the feature.

• github上的问题
• 还有一个小的 github项目，以查看实际效果

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