001    // Copyright 2009 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.tapestry5.ioc.annotations;
016    
017    import java.lang.annotation.Documented;
018    import static java.lang.annotation.ElementType.METHOD;
019    import static java.lang.annotation.ElementType.TYPE;
020    import java.lang.annotation.Retention;
021    import static java.lang.annotation.RetentionPolicy.RUNTIME;
022    import java.lang.annotation.Target;
023    
024    /**
025     * An optional annotation that may be placed on a service building method of a module, or on the implementation class
026     * (when using service binding via the {@link org.apache.tapestry5.ioc.ServiceBinder}). The annotation overrides the
027     * default id for services (the default service id is the simple name of the service interface).
028     */
029    @Target({ TYPE, METHOD })
030    @Retention(RUNTIME)
031    @Documented
032    @UseWith({AnnotationUseContext.SERVICE, AnnotationUseContext.MODULE})
033    public @interface ServiceId
034    {
035        /**
036         * An identifier of a service.
037         */
038        String value();
039    }