001    // Copyright 2008, 2010 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.services;
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    /**
024     * Marker annotation used to inject the correct {@link org.apache.tapestry5.services.InvalidationEventHub} service
025     * responsible for invalidations when underlying component class files are changed.
026     * 
027     * @since 5.1.0.0
028     */
029    @Target(
030    { ElementType.PARAMETER, ElementType.FIELD, ElementType.METHOD })
031    @Retention(RetentionPolicy.RUNTIME)
032    @Documented
033    public @interface ComponentClasses
034    {
035    }