001    // Copyright 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.annotations;
016    
017    import static java.lang.annotation.ElementType.METHOD;
018    import static java.lang.annotation.RetentionPolicy.RUNTIME;
019    import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.COMPONENT;
020    import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.MIXIN;
021    import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.PAGE;
022    
023    import java.lang.annotation.Documented;
024    import java.lang.annotation.Retention;
025    import java.lang.annotation.Target;
026    
027    import org.apache.tapestry5.ioc.annotations.UseWith;
028    
029    /**
030     * Marks a method of a page or a component to discard all persistent field changes. The changes are
031     * eliminated from persistent storage after the marked method is invoked. Any exception (runtime or checked) 
032     * thrown by annotated method will cause persistent fields to keep their values.
033     * 
034     * @see org.apache.tapestry5.ComponentResources#discardPersistentFieldChanges()
035     * @since 5.2.0
036     */
037    @Target(METHOD)
038    @Retention(RUNTIME)
039    @Documented
040    @UseWith({COMPONENT,MIXIN,PAGE})
041    public @interface DiscardAfter
042    {
043    
044    }