https://github.com/cepr0/sb-tagged-autowire-candidate-resolver

TaggedAutowireCandidateResolver - an example of Spring AutowireCandidateResolver
https://github.com/cepr0/sb-tagged-autowire-candidate-resolver

autowiring beans injection spring

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TaggedAutowireCandidateResolver - an example of Spring AutowireCandidateResolver

• Host: GitHub
• URL: https://github.com/cepr0/sb-tagged-autowire-candidate-resolver
• Owner: Cepr0
• Created: 2019-08-01T14:43:12.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2019-08-02T09:28:16.000Z (over 5 years ago)
• Last Synced: 2024-11-17T02:42:22.657Z (2 months ago)
• Topics: autowiring, beans, injection, spring
• Language: Java
• Size: 8.79 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

        
# TaggedAutowireCandidateResolver 

_An example of custom implementation of Spring [AutowireCandidateResolver][1]_

[TaggedAutowireCandidateResolver][2] is an implementation of `AutowireCandidateResolver` 

that makes it possible to get collections of injected Spring beans 

tagged by specified 'tags'. Tags are specified with [@Tags][3] annotation 

in style of `@Qualifier` annotation. Collection is formed from the beans 

that have the same type and the same tags as the autowired collection.

```java

@Autowired

@Tags({"greeting", "other"})

private Map> greetingOrOther;

@Configuration

static class Beans {

   @Tags({"greeting", "2symbols", "even"})

   @Bean

   public Supplier hi() {

      return () -> "hi";

   }

   @Tags({"parting", "2symbols", "even"})

   @Bean

   public Supplier by() {

      return () -> "by";

   }

   @Tags({"greeting", "5symbols", "odd"})

   @Bean

   public Supplier hello() {

      return () -> "hello";

   }

   @Tags({"parting", "7symbols", "odd"})

   @Bean

   public Supplier goodbye() {

      return () -> "goodbye";

   }

   @Tags({"other", "5symbols", "odd"})

   @Bean

   public Supplier other() {

      return () -> "other";

   }

}

``` 

Here Map `greetingOrOther` will have three `Supplier` beans: `hi`, `hello` and `other`;

To make it work you have to register a [CustomAutowireConfigurer][6] bean in your application

and provide it with `TaggedAutowireCandidateResolver`:

```java

@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 are in [Test][4]

This project is related to this [SO post][5].

[1]: https://bit.ly/2Yj8qK0

[2]: src/main/java/io/github/cepr0/resolver/TaggedAutowireCandidateResolver.java

[3]: src/main/java/io/github/cepr0/resolver/Tags.java

[4]: src/test/java/io/github/cepr0/resolver/TaggedAutowireCandidateResolverTest.java

[5]: https://stackoverflow.com/a/57169506

[6]: https://docs.spring.io/spring/docs/current/spring-framework-reference/core.html#beans-custom-autowire-configurer