org.jvnet.hk2.annotations.Service Maven / Gradle / Ivy
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package org.jvnet.hk2.annotations;
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;
import org.glassfish.hk2.api.ClassAnalyzer;
/**
* Annotation placed on classes that are to be automatically added
* to an hk2 {@link org.glassfish.hk2.api.ServiceLocator}. A service
* marked with this annotation has the default scope of {@link javax.inject.Singleton},
* but any other scope annotation placed on the class will override that default.
*
* This annotation is read at build time using the hk2-inhabitant-generator
* and information about the service is placed into a file in the
* associated jar. The usual way to get these services into
* a {@link org.glassfish.hk2.api.ServiceLocator} is to use a
* {@link org.glassfish.hk2.api.Populator} as provided by the
* {@link org.glassfish.hk2.api.DynamicConfigurationService#getPopulator()}
* method. An easier way to do that is with the
* {@link org.glassfish.hk2.utilities.ServiceLocatorUtilities#createAndPopulateServiceLocator()}
* utility.
*
* @author Jerome Dochez
* @author Kohsuke Kawaguchi
* @see org.glassfish.hk2.api.Factory org.glassfish.hk2.api.ClassAnalyzer
*/
@Retention(RUNTIME)
@Target(TYPE)
@Documented
@InhabitantAnnotation("default")
public @interface Service {
/**
* Name of the service.
*
*
* {@link org.glassfish.hk2.api.ServiceLocator#getService(Class, String, java.lang.annotation.Annotation...)} and
* similar methods can be used to obtain a service with a particular name.
*
*
* The default value "" indicates that the inhabitant has no name.
*/
String name() default "";
/**
* Additional metadata that goes into the inhabitants file.
* The value is "key={value},key={value1,value2,...},..." format.
*
* This information is accessible from {@link org.glassfish.hk2.api.Descriptor#getMetadata()}.
*
*
* 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 "";
/**
* The name of the {@link ClassAnalyzer} service that should be used
* to analyze this class
*
* @return The name of the {@link ClassAnalyzer} service that should
* be used to analyze this class
*/
String analyzer() default ClassAnalyzer.DEFAULT_IMPLEMENTATION_NAME;
}