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}