    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    }