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
015package org.apache.tapestry5.annotations;
016
017import static java.lang.annotation.ElementType.METHOD;
018import static java.lang.annotation.RetentionPolicy.RUNTIME;
019import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.COMPONENT;
020import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.MIXIN;
021import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.PAGE;
022
023import java.lang.annotation.Documented;
024import java.lang.annotation.Retention;
025import java.lang.annotation.Target;
026
027import 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})
041public @interface DiscardAfter
042{
043
044}