001    // Copyright 2007 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.hivemind.annotations.definition;
016    
017    import java.lang.annotation.Documented;
018    import java.lang.annotation.ElementType;
019    import java.lang.annotation.Retention;
020    import java.lang.annotation.RetentionPolicy;
021    import java.lang.annotation.Target;
022    
023    import org.apache.hivemind.internal.ServiceModel;
024    
025    /**
026     * Marks a method in an annotated module as service point. 
027     * The return type of the method defines the service interface. 
028     * The method is used factory method for the construction of service implementations.
029     * 
030     * @author Achim Huegen
031     */
032    @Documented
033    @Retention(value = RetentionPolicy.RUNTIME)
034    @Target(value = ElementType.METHOD)
035    public @interface Service {
036        String id();
037        String serviceModel() default ServiceModel.SINGLETON;
038    }