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// $Id$
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/**
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* Copyright (C) 2015 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.taxeditor.remoting.cache;
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import java.lang.reflect.Field;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import net.sf.ehcache.Cache;
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import net.sf.ehcache.Element;
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import org.apache.log4j.Logger;
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import org.springframework.util.ReflectionUtils;
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import eu.etaxonomy.cdm.model.ICdmCacher;
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import eu.etaxonomy.cdm.model.common.CdmBase;
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/**
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* @author cmathew
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* @date 19 Feb 2015
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*
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*/
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public class CacheLoader {
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private static final Logger logger = Logger.getLogger(CacheLoader.class);
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private static boolean isRecursiveEnabled = true;
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protected final ICdmCacher cdmCacher;
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private final Cache cdmlibModelCache;
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public CacheLoader(ICdmCacher cdmCacher) {
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this.cdmCacher = cdmCacher;
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this.cdmlibModelCache = CdmRemoteCacheManager.getInstance().getCdmModelGetMethodsCache();
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}
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public CdmModelFieldPropertyFromClass getFromCdmlibModelCache(String className) {
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Element e = cdmlibModelCache.get(className);
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if (e == null) {
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return null;
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} else {
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return (CdmModelFieldPropertyFromClass) e.getObjectValue();
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}
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}
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@SuppressWarnings("unchecked")
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public <T extends Object> T load(T obj, boolean recursive, boolean update) {
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if(obj == null) {
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return null;
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}
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if(obj instanceof CdmBase) {
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return (T) load((CdmBase)obj, recursive, update);
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} else if (obj instanceof Map) {
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return (T) load((Map<T,T>)obj, recursive, update);
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} else if (obj instanceof Collection) {
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return (T) load((Collection<T>)obj, recursive, update);
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}
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return obj;
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}
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@SuppressWarnings("unchecked")
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private <T extends Object> T loadRecursive(T obj, List<Object> alreadyVisitedEntities, boolean update) {
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if(obj == null) {
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return null;
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}
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if(obj instanceof CdmBase) {
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return (T) loadRecursive((CdmBase)obj, alreadyVisitedEntities, update);
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} else if (obj instanceof Map) {
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return (T) load((Map<T,T>)obj, alreadyVisitedEntities, update);
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} else if (obj instanceof Collection) {
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return (T) load((Collection<T>)obj, alreadyVisitedEntities, update);
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}
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logger.info("No caching yet for type " + obj.getClass().getName());
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return obj;
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}
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public <T extends Object> Map<T,T> load(Map<T,T> map, boolean recursive, boolean update){
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if(isRecursiveEnabled && recursive) {
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logger.info("---- starting recursive load for cdm entity map");
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List<Object> alreadyVisitedEntities = new ArrayList<Object>();
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Map<T,T> cachedMap = load(map, alreadyVisitedEntities, update);
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alreadyVisitedEntities.clear();
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logger.info("---- ending recursive load for cdm entity map \n");
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return cachedMap;
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} else {
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return load(map, null, update);
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}
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}
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private <T extends Object> Map<T,T> load(Map<T,T> map, List<Object> alreadyVisitedEntities, boolean update){
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//map = (Map<T,T>)deproxy(map);
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if(map == null || map.isEmpty()) {
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return map;
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}
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int originalMapSize = map.size();
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Object[] result = new Object[ map.size() * 2 ];
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Iterator<Map.Entry<T,T>> iter = map.entrySet().iterator();
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int i=0;
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// to avoid ConcurrentModificationException
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alreadyVisitedEntities.add(map);
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while ( iter.hasNext() ) {
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Map.Entry<T,T> e = iter.next();
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result[i++] = e.getKey();
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result[i++] = e.getValue();
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}
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for(i=0; i<result.length;i++) {
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if(alreadyVisitedEntities == null) {
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result[i] = load(result[i], false, update);
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} else {
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result[i] = loadRecursive(result[i], alreadyVisitedEntities, update);
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}
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}
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map.clear();
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for(i = 0; i < originalMapSize; i+=2 ) {
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map.put(
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(T)result[i],
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(T)result[i+1]
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);
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}
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return map;
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}
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public <T extends Object> Collection<T> load(Collection<T> collection, boolean recursive, boolean update){
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Collection<T> loadedCollection;
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if(isRecursiveEnabled && recursive) {
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logger.info("---- starting recursive load for cdm entity collection");
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List<Object> alreadyVisitedEntities = new ArrayList<Object>();
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Collection<T> cachedCollection = load(collection, alreadyVisitedEntities, update);
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alreadyVisitedEntities.clear();
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logger.info("---- ending recursive load for cdm entity collection \n");
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loadedCollection = cachedCollection;
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} else {
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loadedCollection = load(collection, null, update);
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}
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return loadedCollection;
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}
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@SuppressWarnings("unchecked")
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private <T extends Object> Collection<T> load(Collection<T> collection, List<Object> alreadyVisitedEntities, boolean update) {
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if(collection == null || collection.isEmpty()) {
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return collection;
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}
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int length = collection.size();
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Object[] result = new Object[length];
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Iterator<T> collectionItr = collection.iterator();
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int count = 0;
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// to avoid ConcurrentModificationException
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alreadyVisitedEntities.add(collection);
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while(collectionItr.hasNext()) {
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Object obj = collectionItr.next();
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if(alreadyVisitedEntities == null) {
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result[count] = load(obj, false, update);
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} else {
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result[count] = loadRecursive(obj, alreadyVisitedEntities, update);
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}
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count++;
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}
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collection.clear();
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for ( int i = 0; i < length; i++ ) {
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collection.add((T)result[i]);
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}
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return collection;
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}
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/**
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* Puts the (Key,Value) pair of ({@link java.util.UUID}, {@link eu.etaxonomy.cdm.model.common.CdmBase}),
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* in the cache corresponding to the given cache id
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*
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* @param cacheId
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* @param uuid
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* @param cdmEntity
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*/
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public CdmBase load(CdmBase cdmEntity, boolean recursive, boolean update) {
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if(cdmEntity == null) {
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return null;
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}
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// start by looking up the cdm entity in the cache
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CdmBase cachedCdmEntity = cdmCacher.getFromCache(cdmEntity);
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if(cachedCdmEntity != null) {
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// if cdm entity was found in cache then
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logger.info(" - object of type " + cdmEntity.getClass().getName() + " with id " + cdmEntity.getId() + " already exists");
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// .. return if the cached and input objects are identical, else (this is a newly loaded object so) continue
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if(cachedCdmEntity == cdmEntity) {
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return cachedCdmEntity;
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}
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}
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CdmBase loadedCdmBase;
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if(isRecursiveEnabled && recursive) {
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logger.info("---- starting recursive load for cdm entity " + cdmEntity.getClass().getName() + " with id " + cdmEntity.getId());
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List<Object> alreadyVisitedEntities = new ArrayList<Object>();
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CdmBase cb = loadRecursive(cdmEntity, alreadyVisitedEntities, update);
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alreadyVisitedEntities.clear();
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logger.info("---- ending recursive load for cdm entity " + cdmEntity.getClass().getName() + " with id " + cdmEntity.getId() + "\n");
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loadedCdmBase = cb;
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} else {
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loadedCdmBase = load(cdmEntity);
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}
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return loadedCdmBase;
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}
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protected CdmBase load(CdmBase cdmEntity) {
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logger.info("loading object of type " + cdmEntity.getClass().getName() + " with id " + cdmEntity.getId());
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cdmCacher.put((CdmBase)ProxyUtils.deproxy(cdmEntity));
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return cdmCacher.getFromCache(cdmEntity);
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}
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private CdmBase loadRecursive(CdmBase cdmEntity, List<Object> alreadyVisitedEntities, boolean update) {
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CdmBase cachedCdmEntity = load(cdmEntity);
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// we want to recursive through the cdmEntity (and not the cachedCdmEntity)
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// since there could be new or deleted objects in the cdmEntity sub-graph
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// start by getting the fields from the cdm entity
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String className = cdmEntity.getClass().getName();
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CdmModelFieldPropertyFromClass cmgmfc = getFromCdmlibModelCache(className);
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if(cmgmfc != null) {
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alreadyVisitedEntities.add(cdmEntity);
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List<String> fields = cmgmfc.getFields();
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for(String field : fields) {
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// retrieve the actual object corresponding to the field.
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// this object will be either a CdmBase or a Collection / Map
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// with CdmBase as the generic type
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CdmBase cdmEntityInSubGraph = getCdmBaseTypeFieldValue(cdmEntity, cachedCdmEntity, field, alreadyVisitedEntities, update);
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if(cdmEntityInSubGraph != null) {
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//checkForIdenticalCdmEntity(alreadyVisitedEntities, cdmEntityInSubGraph);
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if(!checkForIdenticalCdmEntity(alreadyVisitedEntities, cdmEntityInSubGraph)) {
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logger.info("recursive loading object of type " + cdmEntityInSubGraph.getClass().getName() + " with id " + cdmEntityInSubGraph.getId());
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loadRecursive(cdmEntityInSubGraph, alreadyVisitedEntities, update);
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} else {
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logger.info("object of type " + cdmEntityInSubGraph.getClass().getName() + " with id " + cdmEntityInSubGraph.getId() + " already visited");
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}
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}
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}
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} else {
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throw new CdmClientCacheException("CdmEntity with class " + cdmEntity.getClass().getName() + " is not found in the cdmlib model cache. " +
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"The cache may be corrupted or not in sync with the latest model version" );
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}
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return cachedCdmEntity;
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}
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private CdmBase getCdmBaseTypeFieldValue(CdmBase cdmEntity,
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CdmBase cachedCdmEntity,
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String fieldName,
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List<Object> alreadyVisitedEntities,
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boolean update) {
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// this method attempts to make sure that for any two objects found in
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// the object graph, if they are equal then they should also be the same,
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// which is crucial for the merge to work
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if(cachedCdmEntity == null) {
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throw new CdmClientCacheException("When trying to set field value, the cached cdm entity cannot be null");
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}
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Class<?> clazz = cdmEntity.getClass();
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try {
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// this call will search in the provided class as well as
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// the super classes until it finds the field
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Field field = ReflectionUtils.findField(clazz, fieldName);
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if(field == null) {
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throw new CdmClientCacheException("Field '" + fieldName
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+ "' not found when searching in class '" + clazz.getName() + "' and its supercalsses");
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}
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field.setAccessible(true);
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Object o = field.get(cdmEntity);
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// resetting the value in cdm entity to the deproxied object
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o = ProxyUtils.deproxy(o);
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field.set(cdmEntity, o);
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CdmBase cdmEntityInSubGraph = null;
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if(update) {
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// if we are in update mode we have to make the field of the cached entity
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// up-to-date by setting it to the value of the cdm entity being loaded
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// NOTE : the filed is overridden in the case of two exceptions
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// found below
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field.set(cachedCdmEntity, o);
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}
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if(o != null && !ProxyUtils.isProxy(o)) {
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if(CdmBase.class.isAssignableFrom(o.getClass())) {
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logger.info("found initialised cdm entity '" + fieldName + "' in object of type " + clazz.getName() + " with id " + cdmEntity.getId());
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cdmEntityInSubGraph = (CdmBase)o;
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CdmBase cachedCdmEntityInSubGraph = cdmCacher.getFromCache(cdmEntityInSubGraph);
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// Object oldCachedCdmEntityInSubGraph = field.get(cachedCdmEntity);
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// if(ProxyUtils.isProxy(oldCachedCdmEntityInSubGraph)) {
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// LazyInitializer hli =
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// ((HibernateProxy)oldCachedCdmEntityInSubGraph).getHibernateLazyInitializer();
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//
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// if(cdmEntityInSubGraph.getId() == ((Integer)hli.getIdentifier()).intValue()) {
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// // exception 1 : is the case where
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// // the earlier value of the field in the cached entity
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// // was a proxy with the same id then we don't need to
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// // update it here as it will be updated on demand,
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// // so we reset it to the earlier proxy
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// field.set(cachedCdmEntity, oldCachedCdmEntityInSubGraph);
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// return null;
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// }
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// }
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if(cachedCdmEntityInSubGraph != null) {
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if(cachedCdmEntityInSubGraph != cdmEntityInSubGraph) {
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// exception 2 : is the case where
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// the field has been already initialised, cached and
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// is not the same as the one in the cache, in which case we set the value
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// of the field to the one found in the cache
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logger.info("setting cached + real value to '" + fieldName + "' in object of type " + clazz.getName() + " with id " + cdmEntity.getId());
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field.set(cachedCdmEntity, cachedCdmEntityInSubGraph);
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field.set(cdmEntity, cachedCdmEntityInSubGraph);
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} else {
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// since the field value object in cdmEntity
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// is the same as the field value object in cachedCdmEntity
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// we are sure that the its subgraph is also correctly loaded,
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// so we can exit the recursion
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return null;
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}
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}
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} else if(o instanceof Map && !checkForIdenticalCdmEntity(alreadyVisitedEntities, o)) {
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loadRecursive((Map)o, alreadyVisitedEntities, update);
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} else if(o instanceof Collection && !checkForIdenticalCdmEntity(alreadyVisitedEntities, o)) {
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loadRecursive((Collection)o, alreadyVisitedEntities, update);
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}
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}
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// we return the original cdm entity in the sub graph because we
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// want to continue to recurse on the input cdm entity graph
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// and not the one in the cache
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return cdmEntityInSubGraph;
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} catch (SecurityException e) {
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throw new CdmClientCacheException(e);
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} catch (IllegalArgumentException e) {
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throw new CdmClientCacheException(e);
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} catch (IllegalAccessException e) {
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throw new CdmClientCacheException(e);
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}
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}
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private boolean checkForIdenticalCdmEntity(List<Object> objList, Object objToCompare) {
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if(objToCompare != null) {
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for(Object obj : objList) {
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if(obj == objToCompare) {
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return true;
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}
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}
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}
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return false;
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}
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public static boolean isRecursiveEnabled() {
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return isRecursiveEnabled;
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}
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public static void setRecursiveEnabled(boolean ire) {
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isRecursiveEnabled = ire;
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}
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}
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