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 015package org.apache.tapestry5.internal.services; 016 017import org.apache.tapestry5.internal.structure.Page; 018import org.apache.tapestry5.ioc.ScopeConstants; 019import org.apache.tapestry5.ioc.annotations.PostInjection; 020import org.apache.tapestry5.ioc.annotations.Scope; 021import org.apache.tapestry5.ioc.internal.util.CollectionFactory; 022import org.apache.tapestry5.ioc.internal.util.InternalUtils; 023import org.apache.tapestry5.ioc.services.PerthreadManager; 024import org.apache.tapestry5.ioc.services.ThreadCleanupListener; 025import org.apache.tapestry5.services.ComponentClassResolver; 026import org.slf4j.Logger; 027 028import 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) 037public 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}