org.jvnet.hk2.annotations.Service Maven / Gradle / Ivy
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package org.jvnet.hk2.annotations;
import com.sun.hk2.component.InhabitantsFile;
import org.jvnet.hk2.component.Habitat;
import org.jvnet.hk2.component.Inhabitant;
import static java.lang.annotation.ElementType.TYPE;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import java.lang.annotation.Target;
import java.lang.annotation.Documented;
/**
* Marker interface for service implementation. A service is defined by
* an interface marked with the {@link Contract} annotation. Each service
* implementation must be marked with the @Service interface and
* implement the service interface.
*
* @author Jerome Dochez
* @author Kohsuke Kawaguchi
* @see Factory
*/
@Retention(RUNTIME)
@Target(TYPE)
@Documented
@InhabitantAnnotation("default")
public @interface Service {
/**
* Name of the service.
*
*
* {@link Habitat#getComponent(Class, String)} and similar methods can be used
* to obtain a service with a particular name. All the named services
* are still available through {@link Habitat#getAllByContract(Class)}.
*
*
* The default value "" indicates that the inhabitant is anonymous.
*/
@Index
String name() default "";
/**
* Additional metadata that goes into the inhabitants file.
* The value is "key=value,key=value,..." format. See {@link InhabitantsFile}
* for more details.
*
* This information is accessible from {@link Inhabitant#metadata()}.
*
*
* While this is limited in expressiveness, metadata has a performance advantage
* in it that it can be read without even creating a classloader for this class.
* For example, this feature is used by the configuration module so that
* the config file can be read without actually loading the classes.
*/
String metadata() default "";
}