001    // Copyright 2007, 2009, 2010, 2011 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 org.apache.tapestry5.ioc.annotations.UseWith;
018    
019    import java.lang.annotation.Documented;
020    import java.lang.annotation.Retention;
021    import java.lang.annotation.Target;
022    
023    import static java.lang.annotation.ElementType.METHOD;
024    import static java.lang.annotation.RetentionPolicy.RUNTIME;
025    import static org.apache.tapestry5.ioc.annotations.AnnotationUseContext.*;
026    
027    /**
028     * Method annotation used for methods that should be invoked when the page is first attached to a request. This is
029     * useful for initializations that should occur on each request that involves the page. Often, such initializations will
030     * be balanced by cleanups when the page is detached.
031     * <p/>
032     * PageAttached methods should take no parameters and return void. They must either have this annotation, or be named
033     * "pageAttached".
034     * <p/>
035     * To be clear: methods with this annotation (or name) are still invoked even in Tapestry 5.2, which does away with
036     * the page pool.
037     *
038     * @see PageDetached
039     * @deprecated In Tapestry 5.3, with no replacement (attach logic no longer meaningful now that pages are singletons).
040     */
041    @Target(METHOD)
042    @Retention(RUNTIME)
043    @Documented
044    @UseWith({COMPONENT, MIXIN, PAGE})
045    public @interface PageAttached
046    {
047    
048    }