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DataKernel has an extremely lightweight DI with ground-breaking design principles. It supports nested scopes, singletons, object factories, modules and plugins which allow to transform graph of dependencies at startup time without any reflection.

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package io.datakernel.di.annotation;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/**
 * This is a built-in {@link io.datakernel.di.util.AbstractAnnotation stateful} {@link io.datakernel.di.core.Name name} annotation.
 * 
 * It is used for quick prototyping or when you need too many different keys with the same type.
 * 
 * If you have only few distinct groups of objects with the same type, consider making your own {@link NameAnnotation name annotations}.
 */
@NameAnnotation
@Target({FIELD, PARAMETER, METHOD})
@Retention(RUNTIME)
public @interface Named {
	String value();
}