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
025/**
026 * Indicates that an annotated class is a "Service", originally defined by Domain-Driven
027 * Design (Evans, 2003) as "an operation offered as an interface that stands alone in the
028 * model, with no encapsulated state."
029 *
030 * <p>May also indicate that a class is a "Business Service Facade" (in the Core J2EE
031 * patterns sense), or something similar. This annotation is a general-purpose stereotype
032 * and individual teams may narrow their semantics and use as appropriate.
033 *
034 * <p>This annotation serves as a specialization of {@link Component @Component},
035 * allowing for implementation classes to be autodetected through classpath scanning.
036 *
037 * @author Juergen Hoeller
038 * @since 2.5
039 * @see Component
040 * @see Repository
041 */
042@Target({ElementType.TYPE})
043@Retention(RetentionPolicy.RUNTIME)
044@Documented
045@Component
046public @interface Service {
047
048        /**
049         * The value may indicate a suggestion for a logical component name,
050         * to be turned into a Spring bean in case of an autodetected component.
051         * @return the suggested component name, if any (or empty String otherwise)
052         */
053        String value() default "";
054
055}