interface @Uses

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.qi4j.api.injection.InjectionScope;

/**
* Annotation to denote the injection of a dependency
* to be used by a Mixin.
* The injected object is provided by the CompositeBuilder.
* Call {@link org.qi4j.api.composite.CompositeBuilder#use}
* to provide the instance to be injected.
*/
@Retention( RetentionPolicy.RUNTIME )
@Target( { ElementType.PARAMETER, ElementType.FIELD } )
@Documented
@InjectionScope
public @interface Uses
{
    /** True if usage is optional, only fail if false.
     */
    boolean optional() default false;
}