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/**
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* Copyright (C) 2017 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.cdm.cache;
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import java.beans.PropertyDescriptor;
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import java.io.PrintStream;
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import java.lang.reflect.InvocationTargetException;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import org.apache.commons.beanutils.PropertyUtils;
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import org.apache.commons.lang.builder.HashCodeBuilder;
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import org.apache.log4j.Logger;
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import org.hibernate.Hibernate;
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import org.hibernate.collection.internal.AbstractPersistentCollection;
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import org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.CollectionProxy;
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import org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.MapProxy;
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import org.hibernate.envers.internal.entities.mapper.relation.lazy.proxy.SortedMapProxy;
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import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;
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import eu.etaxonomy.cdm.model.common.CdmBase;
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import eu.etaxonomy.cdm.model.reference.INomenclaturalReference;
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import eu.etaxonomy.cdm.persistence.dao.initializer.AbstractBeanInitializer;
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/**
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* @author a.kohlbecker
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* @since 08.11.2017
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*
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*/
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public class CdmEntityCache implements EntityCache {
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private final static Logger logger = Logger.getLogger(CdmEntityCache.class);
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private static final String COPY_ENTITY = "!";
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private Set<CdmBase> entities = new HashSet<>();
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private Map<EntityKey, CdmBase> entityyMap = new HashMap<>();
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private List<String> entityPathList = new ArrayList<>();
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private Map<EntityKey, List<String>> entityPathsMap = new HashMap<>();
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private Set<EntityKey> copyEntitiyKeys = new HashSet<>();
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private Set<Object> objectsSeen = new HashSet<>();
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/**
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* @param entity the first entity to be cached. can be <code>null</code>.
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* Further entities can be added to the cache with {@link CdmEntityCache#add(CdmBase)}
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*/
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public CdmEntityCache(CdmBase entity){
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if(entity != null){
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this.entities.add(entity);
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update();
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}
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}
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@Override
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public boolean update() {
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entityPathList.clear();
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entityPathsMap.clear();
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objectsSeen.clear();
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copyEntitiyKeys.clear();
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for(CdmBase entity : entities){
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analyzeEntity(entity, "");
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}
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return copyEntitiyKeys.isEmpty();
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}
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/**
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*
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*/
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protected void analyzeEntity(CdmBase bean, String propertyPath) {
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EntityKey entityKey = new EntityKey(bean);
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propertyPath += "[" + entityKey;
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String flags = "";
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CdmBase mappedEntity = entityyMap.put(entityKey, bean);
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if(mappedEntity != null && mappedEntity != bean) {
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copyEntitiyKeys.add(entityKey);
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flags += COPY_ENTITY + bean.hashCode();
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}
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flags = analyzeMore(bean, entityKey, flags, mappedEntity);
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if(!flags.isEmpty()){
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propertyPath += "(" + flags + ")";
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}
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propertyPath += "]";
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logger.debug(propertyPath);
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entityPathList.add(propertyPath);
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if(!entityPathsMap.containsKey(entityKey)){
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entityPathsMap.put(entityKey, new ArrayList<>());
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}
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entityPathsMap.get(entityKey).add(propertyPath);
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if(!objectsSeen.add(bean)){
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// avoid cycles, do not recurse into properties of objects that have been analyzed already
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return;
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}
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Set<PropertyDescriptor> properties = AbstractBeanInitializer.getProperties(bean, null);
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for(PropertyDescriptor prop : properties){
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try {
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Object propertyValue = PropertyUtils.getProperty(bean, prop.getName());
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if(propertyValue == null){
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continue;
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}
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String propertyPathSuffix = "." + prop.getName();
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logger.debug("\t\tproperty:" + propertyPathSuffix);
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if(Hibernate.isInitialized(propertyValue)) {
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if(CdmBase.class.isAssignableFrom(prop.getPropertyType())
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|| INomenclaturalReference.class.isAssignableFrom(prop.getPropertyType())
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){
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analyzeEntity(HibernateProxyHelper.deproxy(propertyValue, CdmBase.class), propertyPath + propertyPathSuffix);
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continue;
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}
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Collection<CdmBase> collection = null;
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if(propertyValue instanceof AbstractPersistentCollection){
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if (propertyValue instanceof Collection) {
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collection = (Collection<CdmBase>) propertyValue;
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} else if (propertyValue instanceof Map) {
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collection = ((Map<?,CdmBase>)propertyValue).values();
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} else {
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logger.error("unhandled subtype of AbstractPersistentCollection");
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}
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} else if (propertyValue instanceof CollectionProxy
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|| propertyValue instanceof MapProxy<?, ?>
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|| propertyValue instanceof SortedMapProxy<?, ?>){
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//hibernate envers collections
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collection = (Collection<CdmBase>)propertyValue;
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}
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if(collection != null){
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for(CdmBase collectionItem : collection){
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analyzeEntity(HibernateProxyHelper.deproxy(collectionItem, CdmBase.class), propertyPath + propertyPathSuffix);
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}
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} else {
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// logger.error("Unhandled property type " + propertyValue.getClass().getName());
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}
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}
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} catch (IllegalAccessException e) {
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String message = "Illegal access on property " + prop;
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logger.error(message);
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throw new RuntimeException(message, e);
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} catch (InvocationTargetException e) {
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String message = "Cannot invoke property " + prop + " not found";
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logger.error(message);
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throw new RuntimeException(message, e);
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} catch (NoSuchMethodException e) {
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String message = "Property " + prop.getName() + " not found for class " + bean.getClass();
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logger.error(message);
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}
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}
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}
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/**
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* Empty method which can be implemented by subclasses which do further analysis.
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*
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* @param bean
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* @param entityKey
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* @param flags
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* @param mappedEntity
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* @return
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*/
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protected String analyzeMore(CdmBase bean, EntityKey entityKey, String flags, CdmBase mappedEntity) {
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return flags;
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}
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public void printEntityGraph(PrintStream printStream){
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printLegend(printStream);
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for(String path : entityPathList) {
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printStream.println(path);
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}
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}
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public void printCopyEntities(PrintStream printStream){
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printLegend(printStream);
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for(EntityKey key : copyEntitiyKeys){
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for(String path : entityPathsMap.get(key)) {
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printStream.println(path);
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}
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}
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}
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/**
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* @param printStream
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*/
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protected void printLegend(PrintStream printStream) {
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printStream.println(this.getClass().getSimpleName() + " legend: ");
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printStream.println(" - '!{objectHash}': detected copy entity, followed by object hash");
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}
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public class EntityKey {
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Class type;
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int id;
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public EntityKey(Class type, int id){
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this.type = type;
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this.id = id;
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}
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public EntityKey(CdmBase entity){
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type = entity.getClass();
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id = entity.getId();
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}
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/**
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* @return the type
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*/
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public Class getType() {
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return type;
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}
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/**
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* @return the id
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*/
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public int getId() {
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return id;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public int hashCode() {
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return new HashCodeBuilder(15, 33)
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.append(type)
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.append(id)
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.toHashCode();
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}
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@Override
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public boolean equals(Object obj) {
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EntityKey other = (EntityKey)obj;
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return this.id == other.id && this.type == other.type;
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}
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@Override
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public String toString() {
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return type.getSimpleName() + "#" + getId();
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public <CDM extends CdmBase> CDM find(CDM value) {
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if(value != null){
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EntityKey entityKey = new EntityKey(HibernateProxyHelper.deproxy(value));
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return (CDM) entityyMap.get(entityKey);
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}
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return null;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public <CDM extends CdmBase> CDM find(Class<CDM> type, int id) {
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EntityKey entityKey = new EntityKey(type, id);
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return (CDM) entityyMap.get(entityKey);
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public <CDM extends CdmBase> void add(CDM value) {
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entities.add(value);
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analyzeEntity(value, "");
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}
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}
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