How to find CDI beans with a custom annotation with parameters?

Question

I have a Wildfly 10 application in which I have created a custom @Qualifer annotation:

@Retention(RetentionPolicy.RUNTIME)
@Target({FIELD,METHOD,PARAMETER,TYPE})
@Qualifier
public @interface DbType {
    /**
     * If this DbType is part of the initialization process for an existing DB
     */
    boolean init() default false;
}

I then have a couple of producer methods:

@Produces
@DbType
public MyBean createBean1(){
  return new MyBean();
}

@Produces
@DbType(init=true)
public MyBean createBean2(){
  return new MyBean(true);
}

In my code, I want to programatically retrieve all beans with the given annotation, but not sure how.

    Instance<MyBean> configs = CDI.current().select(MyBean.class, new AnnotationLiteral<DbType >() {});

will return both beans.

How can I specify in my CDI.current().select() that I only want beans with the qualifer @MyType(init=true)?

Answer 1

You need create a class that extends AnnotationLiteral and implements your annotation. An example is given by the documentation of AnnotationLiteral:

Supports inline instantiation of annotation type instances.

An instance of an annotation type may be obtained by subclassing AnnotationLiteral.

public abstract class PayByQualifier extends AnnotationLiteral<PayBy> implements PayBy {
}

PayBy payByCheque = new PayByQualifier() {
    public PaymentMethod value() {
        return CHEQUE;
    }
};

In your case, it might look something like:

@Retention(RetentionPolicy.RUNTIME)
@Target({FIELD,METHOD,PARAMETER,TYPE})
@Qualifier
public @interface DbType {
    /**
     * If this DbType is part of the initialization process for an existing DB
     */
    boolean init() default false;

    class Literal extends AnnotationLiteral<DbType> implements DbType {

        public static Literal INIT = new Literal(true);
        public static Literal NO_INIT = new Literal(false);

        private final boolean init;

        private Literal(boolean init) {
            this.init = init;
        }

        @Override
        public boolean init() {
            return init;
        }

    }

}

And then use it:

Instance<MyBean> configs = CDI.current().select(MyBean.class, DbType.Literal.INIT);