| // Copyright 2006, 2007, 2008, 2009 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry5.internal.services; |
| |
| import java.util.Map; |
| |
| import org.apache.tapestry5.internal.structure.Page; |
| import org.apache.tapestry5.ioc.internal.util.CollectionFactory; |
| import org.apache.tapestry5.ioc.services.ThreadCleanupListener; |
| import org.apache.tapestry5.services.ComponentClassResolver; |
| |
| /** |
| * This is the original implementation, which is built around the {@link PagePool}. |
| */ |
| public class RequestPageCacheImpl implements RequestPageCache, ThreadCleanupListener |
| { |
| private final PagePool pagePool; |
| |
| private final ComponentClassResolver resolver; |
| /** |
| * Keyed on canonical page name (case insensitive). |
| */ |
| private final Map<String, Page> cache = CollectionFactory.newCaseInsensitiveMap(); |
| |
| public RequestPageCacheImpl(PagePool pagePool, ComponentClassResolver resolver) |
| { |
| this.pagePool = pagePool; |
| this.resolver = resolver; |
| } |
| |
| public Page get(String pageName) |
| { |
| assert pageName != null; |
| |
| String canonicalName = resolver.canonicalizePageName(pageName); |
| |
| Page page = cache.get(canonicalName); |
| |
| if (page == null) |
| { |
| page = pagePool.checkout(canonicalName); |
| |
| try |
| { |
| page.attached(); |
| } |
| catch (RuntimeException ex) |
| { |
| pagePool.discard(page); |
| |
| throw ex; |
| } |
| |
| cache.put(canonicalName, page); |
| } |
| |
| return page; |
| } |
| |
| /** |
| * At the end of the request, when the thread cleanup event occurs, release any pages attached to the request back |
| * to the page pool. |
| */ |
| public void threadDidCleanup() |
| { |
| for (Page p : cache.values()) |
| pagePool.release(p); |
| } |
| } |