1 /** 2 * This file Copyright (c) 2015-2016 Magnolia International 3 * Ltd. (http://www.magnolia-cms.com). All rights reserved. 4 * 5 * 6 * This file is dual-licensed under both the Magnolia 7 * Network Agreement and the GNU General Public License. 8 * You may elect to use one or the other of these licenses. 9 * 10 * This file is distributed in the hope that it will be 11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the 12 * implied warranty of MERCHANTABILITY or FITNESS FOR A 13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT. 14 * Redistribution, except as permitted by whichever of the GPL 15 * or MNA you select, is prohibited. 16 * 17 * 1. For the GPL license (GPL), you can redistribute and/or 18 * modify this file under the terms of the GNU General 19 * Public License, Version 3, as published by the Free Software 20 * Foundation. You should have received a copy of the GNU 21 * General Public License, Version 3 along with this program; 22 * if not, write to the Free Software Foundation, Inc., 51 23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 24 * 25 * 2. For the Magnolia Network Agreement (MNA), this file 26 * and the accompanying materials are made available under the 27 * terms of the MNA which accompanies this distribution, and 28 * is available at http://www.magnolia-cms.com/mna.html 29 * 30 * Any modifications to this file must keep this entire header 31 * intact. 32 * 33 */ 34 package info.magnolia.imaging.caching; 35 36 import info.magnolia.cms.core.NodeData; 37 import info.magnolia.imaging.ImageGenerator; 38 import info.magnolia.imaging.ParameterProvider; 39 import info.magnolia.jcr.util.NodeTypes; 40 41 import java.util.Calendar; 42 43 import javax.jcr.Node; 44 import javax.jcr.PathNotFoundException; 45 import javax.jcr.Property; 46 import javax.jcr.RepositoryException; 47 48 49 /** 50 * Superclass for {@link javax.jcr.Node}-based {@link CachingStrategy}/ies. 51 * 52 * @param <P> type of ParameterProvider's parameter 53 */ 54 public abstract class AbstractNodeBasedCachingStrategy<P> implements CachingStrategy<P> { 55 56 @Override 57 public String getCachePath(ImageGenerator<ParameterProvider<P>> generator, ParameterProvider<P> parameterProvider) { 58 final P param = parameterProvider.getParameter(); 59 return "/" + generator.getName() + "/" + getWorkspaceName(param) + getPathOf(param); 60 } 61 62 /** 63 * @deprecated since 3.3 - use {@link #shouldRegenerate(Property, ParameterProvider)} instead. 64 */ 65 @Deprecated 66 public boolean shouldRegenerate(NodeData cachedBinary, ParameterProvider<P> parameterProvider) { 67 try { 68 return shouldRegenerate(cachedBinary.getJCRProperty(), parameterProvider); 69 } catch (PathNotFoundException e) { 70 throw new IllegalStateException("Unable to obtain JCR Property from NodeData " + cachedBinary, e); 71 } 72 } 73 74 /** 75 * The default implementation simply delegates this decision to ParameterProvider. 76 * @return true if the image should be regenerated. 77 */ 78 @Override 79 public boolean shouldRegenerate(Property cachedBinary, ParameterProvider<P> parameterProvider) { 80 try { 81 // this is assuming the cached node's metadata was updated, not just the binary 82 final Calendar cacheLastMod = NodeTypes.LastModified.getLastModified(cachedBinary.getParent()); 83 84 // this is assuming our parameter's mgnl:metaData was updated when updating any of its properties/binaries 85 final Node node = getContent(parameterProvider.getParameter()); 86 final Calendar srcLastMod = NodeTypes.LastModified.getLastModified(node); 87 88 //we should always check for the other one anyway since getModificationDate() _can_ return null 89 if (srcLastMod == null ) { 90 // no srcLastMod update, means likely also no source at all ... 91 return false; 92 } else if (cacheLastMod == null) { 93 // no cacheLstMod update, means that the copy is stale or not created properly 94 return true; 95 } else { 96 return cacheLastMod.before(srcLastMod); 97 } 98 } catch (RepositoryException e) { 99 throw new RuntimeException(e); 100 } 101 } 102 103 abstract protected String getWorkspaceName(P param); 104 105 abstract protected Node getContent(P param); 106 107 abstract protected String getPathOf(P param); 108 }