An example of custom implementation of Spring AutowireCandidateResolver
TaggedAutowireCandidateResolver 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 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.
@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";
}
}Here Map greetingOrOther will have three Supplier<String> beans: hi, hello and other;
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 are in Test
This project is related to this SO post.
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