001    // Copyright 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.internal.services;
016    
017    import org.apache.tapestry5.internal.structure.Page;
018    import org.apache.tapestry5.ioc.ScopeConstants;
019    import org.apache.tapestry5.ioc.annotations.PostInjection;
020    import org.apache.tapestry5.ioc.annotations.Scope;
021    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
022    import org.apache.tapestry5.ioc.internal.util.InternalUtils;
023    import org.apache.tapestry5.ioc.services.PerthreadManager;
024    import org.apache.tapestry5.ioc.services.ThreadCleanupListener;
025    import org.apache.tapestry5.services.ComponentClassResolver;
026    import org.slf4j.Logger;
027    
028    import java.util.Map;
029    
030    /**
031     * In Tapestry 5.1, the implementation of this worked with the page pool (a pool of page instances, reserved
032     * to individual requests/threads). Page pooling was deprecated in 5.2 and removed in 5.3.
033     *
034     * @since 5.2
035     */
036    @Scope(ScopeConstants.PERTHREAD)
037    public class NonPoolingRequestPageCacheImpl implements RequestPageCache, ThreadCleanupListener
038    {
039        private final Logger logger;
040    
041        private final ComponentClassResolver resolver;
042    
043        private final PageSource pageSource;
044    
045        private final Map<String, Page> cache = CollectionFactory.newMap();
046    
047        public NonPoolingRequestPageCacheImpl(Logger logger, ComponentClassResolver resolver, PageSource pageSource)
048        {
049            this.logger = logger;
050            this.resolver = resolver;
051            this.pageSource = pageSource;
052        }
053    
054        @PostInjection
055        public void listenForThreadCleanup(PerthreadManager perthreadManager)
056        {
057            perthreadManager.addThreadCleanupListener(this);
058        }
059    
060        public void threadDidCleanup()
061        {
062            for (Page page : cache.values())
063            {
064                try
065                {
066                    page.detached();
067                } catch (Throwable t)
068                {
069                    logger.error(String.format("Error detaching page %s: %s", page, InternalUtils.toMessage(t)), t);
070                }
071            }
072        }
073    
074        public Page get(String pageName)
075        {
076            String canonical = resolver.canonicalizePageName(pageName);
077    
078            Page page = cache.get(canonical);
079    
080            if (page == null)
081            {
082                page = pageSource.getPage(canonical);
083    
084                try
085                {
086                    page.attached();
087                } catch (Throwable t)
088                {
089                    throw new RuntimeException(String.format("Unable to attach page %s: %s", canonical,
090                            InternalUtils.toMessage(t)), t);
091                }
092    
093                cache.put(canonical, page);
094            }
095    
096            return page;
097        }
098    }