How to implement OR logic for spring qualifiers?

gstackoverflow :

I have following configuration:

@Qualifier1
@Qualifier2
@Bean
public MyBean bean1(){...}

@Qualifier2
@Qualifier3
@Bean
public MyBean bean2(){...}

@Qualifier1
@Qualifier2
@Qualifier3
@Bean
public MyBean bean3(){...}

@Qualifier3
@Bean
public MyBean bean4(){...}

@Qualifier1
@Bean
public MyBean bean5(){...}

And it is the injection place:

@Qualifier2
@Qualifier3
@Autowired:
private List<MyBean> beans;

By default spring uses AND logic for each @Qualifier

So bean2 and bean3 will be injected.

But I want to have OR logic for that stuff so I expect beans bean1 bean2 bean3 and bean4 to be injected

How can I achieve it?

P.S.

@Qualifier annotation is not repeatable so I have to create meta annotation for each annotation:

@Retention(RetentionPolicy.RUNTIME)
@Qualifier
public @interface Qualifier1 {
}

Cepr0 :

What if you used marker interfaces instead of qualifiers? For example:

public class MyBean1 extends MyBean implements Marker1 {}

public class MyBean2 extends MyBean implements Marker2 {}

public class MyBean12 extends MyBean implements Marker1, Marker2 {}

Then using this:

@Bean
public MyBean1 myBean1() {
    //...
}

@Bean
public MyBean2 myBean2() {
    //...
}

@Bean
public MyBean12 myBean12() {
    //...
}

and this:

@Autowired private List<Marker1> myBeans;

You would get a list of myBean1 and myBean12 beans.

And for this:

@Autowired private List<Marker2> myBeans;

You would get a list of myBean2 and myBean12 beans.

Will this work?

UPDATE I

Custom FactoryBean

I implemented TagsFactoryBean class and @Tags annotation which you can use to solve your task (I hope :)).

First, mark your beans with @Tags annotation:

@Tags({"greeting", "2letters"})
@Bean
public Supplier<String> hi() {
    return () -> "hi";
}

@Tags({"parting", "2letters"})
@Bean
public Supplier<String> by() {
    return () -> "by";
}

@Tags("greeting")
@Bean
public Supplier<String> hello() {
    return () -> "hello";
}

@Tags("parting")
@Bean
public Supplier<String> goodbye() {
    return () -> "goodbye";
}

@Tags("other")
@Bean
public Supplier<String> other() {
    return () -> "other";
}

Then prepare TagsFactoryBean:

@Bean
public TagsFactoryBean words() {
    return TagsFactoryBean.<Supplier>builder()
            .tags("greeting", "other")
            .type(Supplier.class)
            .generics(String.class)
            .build();
}

Here tags is an array of desired tags whose beans should be selected, type is a selected beans type, and generics is an array of generic types of the beans. The last parameter is optional and should be used only if your beans are generic.

Then you can use it with @Qualifier annotation (otherwise Spring injects all beans of Supplier<String> type):

@Autowired
@Qualifier("words")
private Map<String, Supplier<String>> beans;

The Map beans will contain three beans: hi, hello and other (their name are keys of the Map and their instances are its values).

More usage examples you can find in tests.

UPDATE II

Custom AutowireCandidateResolver

Thanks to @bhosleviraj recommendation, I implemented TaggedAutowireCandidateResolver that simplifies the process of autowiring the desired beans. Just mark your beans and the autowired collection with the same tags and you will get them injected into the collection:

@Autowired
@Tags({"greeting", "other"})
private Map<String, Supplier<String>> greetingOrOther;

@Configuration
static class Beans {
   @Tags({"greeting", "2symbols", "even"})
   @Bean
   public Supplier<String> hi() {
      return () -> "hi";
   }

   @Tags({"parting", "2symbols", "even"})
   @Bean
   public Supplier<String> by() {
      return () -> "by";
   }

   @Tags({"greeting", "5symbols", "odd"})
   @Bean
   public Supplier<String> hello() {
      return () -> "hello";
   }

   @Tags({"parting", "7symbols", "odd"})
   @Bean
   public Supplier<String> goodbye() {
      return () -> "goodbye";
   }

   @Tags({"other", "5symbols", "odd"})
   @Bean
   public Supplier<String> other() {
      return () -> "other";
   }
}

You can use not only the Map for injecting beans but also other Collections.

To make it work you have to register a CustomAutowireConfigurer bean in your application and provide it with TaggedAutowireCandidateResolver:

@Configuration
public class AutowireConfig {
   @Bean
   public CustomAutowireConfigurer autowireConfigurer(DefaultListableBeanFactory beanFactory) {
      CustomAutowireConfigurer configurer = new CustomAutowireConfigurer();
      beanFactory.setAutowireCandidateResolver(new TaggedAutowireCandidateResolver());
      configurer.postProcessBeanFactory(beanFactory);
      return configurer;
   }
}

More usage examples see in this Test.