Named bind different objects of same type

[subash89]

Hi team,
Suppose I have a prebuilt map of Objects, Map<String,MyType> of type MyType.class. Specifically these objects are created by sourcing some data from external api. Not like from a config.

@Getter
class MyType {

   private String name;
   //and several other fields
  
}

My end goal is to inject these objected by name attribute in my api Resource class/Controller. For example

@Named("xyz")
MyType type1;

@Named("abc")
MyType type2;

Is there any way to achieve this ?

[yawkat]

you could manually register it in the bean context with the qualifier, i guess

[yawkat]

you can registerSingleton multiple times for the same class with different qualifiers

[subash89]

@yawkat thanks for the prompt response. May be I am doing this wrong? Sorry, only few days into micronaut.

public class MyBean {

    private String name;

    public MyBean(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

        MyBean bean = new MyBean("test1");
        ctx.registerSingleton(MyBean.class, bean, Qualifiers.byName("abc"));

Then in my resource class I did

   @Named("abc")
    MyBean bean;

I am getting

Caused by: io.micronaut.context.exceptions.NoSuchBeanException: No bean of type [com.myapp.micronaut.poc.bean.MyBean] exists for the given qualifier: @Named('abc'). Make sure the bean is not disabled by bean requirements (enable trace logging for 'io.micronaut.context.condition' to check) and if the bean is enabled then ensure the class is declared a bean and annotation processing is enabled (for Java and Kotlin the 'micronaut-inject-java' dependency should be configured as an annotation processor).
	at io.micronaut.context.DefaultBeanContext.resolveBeanRegistration(DefaultBeanContext.java:2778)
	at io.micronaut.context.DefaultBeanContext.getBean(DefaultBeanContext.java:1594)
	at io.micronaut.context.AbstractBeanResolutionContext.getBean(AbstractBeanResolutionContext.java:66)
	at io.micronaut.context.AbstractInitializableBeanDefinition.resolveBean(AbstractInitializableBeanDefinition.java:2055)

[yawkat]

maybe you're registering it too late? This test case works:

public class RegisterNamedTest {
    @Test
    public void test() {
        ApplicationContext ctx = ApplicationContext.run();
        Foo foo = new Foo() {
        };
        ctx.registerSingleton(Foo.class, foo, Qualifiers.byName("foo"));
        Foo bar = new Foo() {
        };
        ctx.registerSingleton(Foo.class, bar, Qualifiers.byName("bar"));

        Assertions.assertSame(foo, ctx.getBean(Receiver.class).foo);
        Assertions.assertSame(bar, ctx.getBean(Receiver.class).bar);
    }

    @Singleton
    public static class Receiver {
        @Named("foo")
        @Inject
        Foo foo;
        @Named("bar")
        @Inject
        Foo bar;
    }

    public interface Foo {
    }
}

[subash89]

I found the issue. Code was same. But I was testing under @MicronautTest. Calling the api via micronaut HttpClient. Test it with curl instead. It worked. Thanks a lot.

[subash89]

@yawkat sorry for reopening this discussion again.
On a related note, can you tell me how can we do the exact above with Annotation. Like

@Singleton
    public static class Receiver {
       
        @TestFoo("foo")
        Foo foo;
    
      @TestFoo("bar")
        Foo bar;
   }