001/*
002 * Copyright 2002-2017 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.stereotype;
018
019import java.lang.annotation.Documented;
020import java.lang.annotation.ElementType;
021import java.lang.annotation.Retention;
022import java.lang.annotation.RetentionPolicy;
023import java.lang.annotation.Target;
024
025import org.springframework.core.annotation.AliasFor;
026
027/**
028 * Indicates that an annotated class is a "Service", originally defined by Domain-Driven
029 * Design (Evans, 2003) as "an operation offered as an interface that stands alone in the
030 * model, with no encapsulated state."
031 *
032 * <p>May also indicate that a class is a "Business Service Facade" (in the Core J2EE
033 * patterns sense), or something similar. This annotation is a general-purpose stereotype
034 * and individual teams may narrow their semantics and use as appropriate.
035 *
036 * <p>This annotation serves as a specialization of {@link Component @Component},
037 * allowing for implementation classes to be autodetected through classpath scanning.
038 *
039 * @author Juergen Hoeller
040 * @since 2.5
041 * @see Component
042 * @see Repository
043 */
044@Target({ElementType.TYPE})
045@Retention(RetentionPolicy.RUNTIME)
046@Documented
047@Component
048public @interface Service {
049
050        /**
051         * The value may indicate a suggestion for a logical component name,
052         * to be turned into a Spring bean in case of an autodetected component.
053         * @return the suggested component name, if any (or empty String otherwise)
054         */
055        @AliasFor(annotation = Component.class)
056        String value() default "";
057
058}