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UnitOfWorkImpl.java
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UnitOfWorkImpl.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
* version.
* <p>
* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.sessions;
import cz.cvut.kbss.jopa.adapters.IndirectCollection;
import cz.cvut.kbss.jopa.adapters.IndirectWrapper;
import cz.cvut.kbss.jopa.exceptions.EntityNotFoundException;
import cz.cvut.kbss.jopa.exceptions.OWLEntityExistsException;
import cz.cvut.kbss.jopa.exceptions.OWLPersistenceException;
import cz.cvut.kbss.jopa.model.AbstractEntityManager;
import cz.cvut.kbss.jopa.model.BeanListenerAspect;
import cz.cvut.kbss.jopa.model.EntityManagerImpl.State;
import cz.cvut.kbss.jopa.model.LoadState;
import cz.cvut.kbss.jopa.model.MetamodelImpl;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.lifecycle.PostLoadInvoker;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.metamodel.EntityTypeImpl;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.query.NamedQueryManager;
import cz.cvut.kbss.jopa.query.ResultSetMappingManager;
import cz.cvut.kbss.jopa.query.sparql.SparqlQueryFactory;
import cz.cvut.kbss.jopa.sessions.change.ChangeManagerImpl;
import cz.cvut.kbss.jopa.sessions.change.ChangeRecordImpl;
import cz.cvut.kbss.jopa.sessions.change.ChangeSetFactory;
import cz.cvut.kbss.jopa.sessions.descriptor.InstanceDescriptor;
import cz.cvut.kbss.jopa.sessions.descriptor.InstanceDescriptorFactory;
import cz.cvut.kbss.jopa.sessions.validator.AttributeModificationValidator;
import cz.cvut.kbss.jopa.sessions.validator.IntegrityConstraintsValidator;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import cz.cvut.kbss.jopa.utils.ErrorUtils;
import cz.cvut.kbss.jopa.utils.Wrapper;
import org.aspectj.lang.Aspects;
import java.lang.reflect.Field;
import java.net.URI;
import java.util.*;
import java.util.Map.Entry;
import java.util.function.Consumer;
import static cz.cvut.kbss.jopa.exceptions.OWLEntityExistsException.individualAlreadyManaged;
import static cz.cvut.kbss.jopa.utils.EntityPropertiesUtils.getValueAsURI;
public class UnitOfWorkImpl extends AbstractSession implements UnitOfWork, ConfigurationHolder, Wrapper {
// Read-only!!! It is just the keyset of cloneToOriginals
private final Set<Object> cloneMapping;
private final Map<Object, Object> cloneToOriginals;
private final Map<Object, Object> keysToClones = new HashMap<>();
private final Map<Object, Object> deletedObjects;
private final Map<Object, Object> newObjectsCloneToOriginal;
private final Map<Object, Object> newObjectsKeyToClone = new HashMap<>();
private final Map<Object, InstanceDescriptor> instanceDescriptors;
private RepositoryMap repoMap;
private boolean hasChanges;
private boolean hasNew;
private boolean hasDeleted;
private boolean shouldReleaseAfterCommit;
private boolean shouldClearCacheAfterCommit;
private boolean useTransactionalOntology;
private boolean isActive;
private boolean inCommit;
private UnitOfWorkChangeSet uowChangeSet = ChangeSetFactory.createUoWChangeSet();
private final AbstractSession parent;
private AbstractEntityManager entityManager;
private final ConnectionWrapper storage;
private final MergeManager mergeManager;
private final CloneBuilder cloneBuilder;
private final ChangeManager changeManager;
private final SparqlQueryFactory queryFactory;//TODO get into strategy
private final IndirectWrapperHelper indirectWrapperHelper;
/**
* This is a shortcut for the second level cache.
*/
private final CacheManager cacheManager;
public UnitOfWorkImpl(AbstractSession parent) {
super(parent.getConfiguration());
this.parent = Objects.requireNonNull(parent);
this.cloneToOriginals = createMap();
this.cloneMapping = cloneToOriginals.keySet();
this.deletedObjects = createMap();
this.newObjectsCloneToOriginal = createMap();
this.instanceDescriptors = new IdentityHashMap<>();
this.repoMap = new RepositoryMap();
repoMap.initDescriptors();
this.cloneBuilder = new CloneBuilderImpl(this);
this.indirectWrapperHelper = new IndirectWrapperHelper(this);
this.cacheManager = parent.getLiveObjectCache();
this.storage = acquireConnection();
this.queryFactory = new SparqlQueryFactory(this, storage);
this.mergeManager = new MergeManagerImpl(this);
this.changeManager = new ChangeManagerImpl(this);
this.useTransactionalOntology = true;
this.isActive = true;
}
CloneBuilder getCloneBuilder() {
return cloneBuilder;
}
/**
* This method returns null, since we don't support nested Units of Work yet.
*/
@Override
public UnitOfWork acquireUnitOfWork() {
return null;
}
@Override
protected ConnectionWrapper acquireConnection() {
final ConnectionWrapper conn = parent.acquireConnection();
conn.setUnitOfWork(this);
return conn;
}
@Override
public <T> T readObject(Class<T> cls, Object identifier, Descriptor descriptor) {
Objects.requireNonNull(cls, ErrorUtils.getNPXMessageSupplier("cls"));
Objects.requireNonNull(identifier, ErrorUtils.getNPXMessageSupplier("primaryKey"));
Objects.requireNonNull(descriptor, ErrorUtils.getNPXMessageSupplier("descriptor"));
return readObjectInternal(cls, identifier, descriptor);
}
private <T> T readObjectInternal(Class<T> cls, Object identifier, Descriptor descriptor) {
assert cls != null;
assert identifier != null;
assert descriptor != null;
T result = readManagedObject(cls, identifier, descriptor);
if (result != null) {
return result;
}
result = storage.find(new LoadingParameters<>(cls, getValueAsURI(identifier), descriptor));
if (result == null) {
return null;
}
final Object clone = registerExistingObject(result, descriptor,
Collections.singletonList(new PostLoadInvoker(getMetamodel())));
checkForIndirectObjects(clone);
return cls.cast(clone);
}
private <T> T readManagedObject(Class<T> cls, Object identifier, Descriptor descriptor) {
// First try to find the object among new uncommitted objects
Object result = newObjectsKeyToClone.get(identifier);
if (result != null && (isInRepository(descriptor, result))) {
// The result can be returned, since it is already registered in this UOW
return cls.cast(result);
}
// Object is already managed
return getManagedClone(cls, identifier, descriptor);
}
private <T> T getManagedClone(Class<T> cls, Object identifier, Descriptor descriptor) {
if (!keysToClones.containsKey(identifier)) {
return null;
}
final Object clone = keysToClones.get(identifier);
if (!cls.isAssignableFrom(clone.getClass())) {
throw individualAlreadyManaged(identifier);
}
return isInRepository(descriptor, clone) && !deletedObjects.containsKey(clone) ? cls.cast(clone) : null;
}
@Override
public <T> T getReference(Class<T> cls, Object identifier, Descriptor descriptor) {
Objects.requireNonNull(cls);
Objects.requireNonNull(identifier);
Objects.requireNonNull(descriptor);
final T managedResult = readManagedObject(cls, identifier, descriptor);
if (managedResult != null) {
return managedResult;
}
final T result = storage.getReference(new LoadingParameters<>(cls, getValueAsURI(identifier), descriptor));
if (result == null) {
return null;
}
instanceDescriptors.put(result, InstanceDescriptorFactory.createNotLoaded(result, entityType(cls)));
registerEntityWithPersistenceContext(result);
registerEntityWithOntologyContext(result, descriptor);
if (getLiveObjectCache().contains(cls, identifier, descriptor)) {
cloneToOriginals.put(result, getLiveObjectCache().get(cls, identifier, descriptor));
} else {
cloneToOriginals.put(result, null);
}
keysToClones.put(identifier, result);
return result;
}
/**
* This method calculates the changes that were to the registered entities and adds these changes into the given
* change set for future commit to the ontology.
*/
private void calculateChanges() {
if (hasNew) {
calculateNewObjects(uowChangeSet);
}
if (hasDeleted) {
calculateDeletedObjects(uowChangeSet);
}
}
/**
* Create object change sets for the new objects and adds them into our UnitOfWorkChangeSet.
*
* @param changeSet UnitOfWorkChangeSet
*/
private void calculateNewObjects(UnitOfWorkChangeSet changeSet) {
for (Object clone : newObjectsCloneToOriginal.keySet()) {
final Descriptor c = getDescriptor(clone);
Object original = newObjectsCloneToOriginal
.computeIfAbsent(clone, key -> cloneBuilder.buildClone(key, new CloneConfiguration(c)));
if (original == null) {
throw new OWLPersistenceException(
"Error while calculating changes for new objects. Original not found.");
}
newObjectsCloneToOriginal.put(clone, original);
changeSet.addNewObjectChangeSet(ChangeSetFactory.createObjectChangeSet(original, clone,
c));
}
}
private void calculateDeletedObjects(final UnitOfWorkChangeSet changeSet) {
for (Object clone : deletedObjects.keySet()) {
Descriptor descriptor = getDescriptor(clone);
changeSet.addDeletedObjectChangeSet(ChangeSetFactory.createDeleteObjectChangeSet(clone, descriptor));
changeSet.cancelObjectChanges(getOriginal(clone));
}
}
@Override
public void clear() {
detachAllManagedInstances();
cloneToOriginals.clear();
keysToClones.clear();
deletedObjects.clear();
newObjectsCloneToOriginal.clear();
newObjectsKeyToClone.clear();
instanceDescriptors.clear();
this.hasChanges = false;
this.hasDeleted = false;
this.hasNew = false;
cloneBuilder.reset();
this.repoMap = new RepositoryMap();
repoMap.initDescriptors();
this.uowChangeSet = ChangeSetFactory.createUoWChangeSet();
}
private void detachAllManagedInstances() {
cloneMapping.forEach(instance -> {
removeIndirectCollections(instance);
deregisterEntityFromPersistenceContext(instance);
});
newObjectsCloneToOriginal.keySet().forEach(instance -> {
removeIndirectCollections(instance);
deregisterEntityFromPersistenceContext(instance);
});
}
@Override
public boolean contains(Object entity) {
Objects.requireNonNull(entity);
return isObjectManaged(entity);
}
@Override
public void commit() {
LOG.trace("UnitOfWork commit started.");
if (!isActive()) {
throw new IllegalStateException("Cannot commit inactive Unit of Work!");
}
this.inCommit = true;
commitUnitOfWork();
LOG.trace("UnitOfWork commit finished.");
}
@Override
public void rollback() {
LOG.trace("UnitOfWork rollback started.");
if (!isActive()) {
throw new IllegalStateException("Cannot rollback inactive Unit of Work!");
}
storage.rollback();
clear();
}
/**
* Commit this Unit of Work.
*/
private void commitUnitOfWork() {
commitToOntology();
mergeChangesIntoParent();
postCommit();
}
/**
* Clean up after the commit.
*/
private void postCommit() {
final boolean changes = hasChanges();
clear();
this.inCommit = false;
if (changes) {
if (shouldClearCacheAfterCommit) {
cacheManager.evictAll();
this.shouldReleaseAfterCommit = true;
} else {
cacheManager.evictInferredObjects();
}
}
}
/**
* If there are any changes, commit them to the ontology.
*/
private void commitToOntology() {
if (this.hasNew || this.hasChanges || this.hasDeleted) {
calculateChanges();
}
validateIntegrityConstraints();
storageCommit();
}
private void validateIntegrityConstraints() {
final IntegrityConstraintsValidator validator = IntegrityConstraintsValidator.getValidator();
for (ObjectChangeSet changeSet : uowChangeSet.getNewObjects()) {
validator.validate(changeSet.getCloneObject(),
entityType((Class<Object>) changeSet.getObjectClass()), false);
}
uowChangeSet.getExistingObjectsChanges().forEach(changeSet -> validator.validate(changeSet, getMetamodel()));
}
private static Map<Object, Object> createMap() {
return new IdentityHashMap<>();
}
/**
* Gets current state of the specified entity.
* <p>
* Note that since no repository is specified we can only determine if the entity is managed or removed. Therefore
* if the case is different this method returns State#NOT_MANAGED.
*
* @param entity The entity to check
* @return State of the entity
*/
public State getState(Object entity) {
Objects.requireNonNull(entity);
if (deletedObjects.containsKey(entity)) {
return State.REMOVED;
} else if (newObjectsCloneToOriginal.containsKey(entity)) {
return State.MANAGED_NEW;
} else if (cloneMapping.contains(entity)) {
return State.MANAGED;
} else {
return State.NOT_MANAGED;
}
}
/**
* Checks the state of the specified entity with regards to the specified repository.
*
* @param entity Object
* @param descriptor Entity descriptor
* @return The state of the specified entity
*/
public State getState(Object entity, Descriptor descriptor) {
Objects.requireNonNull(entity, ErrorUtils.getNPXMessageSupplier("entity"));
Objects.requireNonNull(descriptor, ErrorUtils.getNPXMessageSupplier("descriptor"));
if (deletedObjects.containsKey(entity)) {
return State.REMOVED;
} else if (newObjectsCloneToOriginal.containsKey(entity) && isInRepository(descriptor, entity)) {
return State.MANAGED_NEW;
} else if (cloneMapping.contains(entity) && isInRepository(descriptor, entity)) {
return State.MANAGED;
} else {
return State.NOT_MANAGED;
}
}
/**
* Tries to find the original object for the given clone. It searches the existing objects, new objects and deleted
* objects.
*
* @param clone Object
* @return The original object for the given clone
*/
public Object getOriginal(Object clone) {
if (clone == null) {
return null;
}
return cloneToOriginals.containsKey(clone) ? cloneToOriginals.get(clone) : newObjectsCloneToOriginal.get(clone);
}
/**
* Gets managed original with the specified identifier or {@code null} if there is none matching.
* <p>
* Descriptor is used to check repository context validity.
*
* @param cls Return type of the original
* @param identifier Instance identifier
* @param descriptor Repository descriptor
* @return Original object managed by this UoW or {@code null} if this UoW doesn't contain a matching instance
*/
public <T> T getManagedOriginal(Class<T> cls, Object identifier, Descriptor descriptor) {
final T clone = getManagedClone(cls, identifier, descriptor);
return clone != null ? cls.cast(cloneToOriginals.get(clone)) : null;
}
/**
* Check if this UnitOfWork contains this original entity. This method is used by the CloneBuilder so it does not
* have to clone already managed referenced objects.
*
* @param entity The original entity.
* @return True if the original is managed in this UnitOfWork.
*/
boolean containsOriginal(Object entity) {
return entity != null && cloneToOriginals.containsValue(entity);
}
/**
* Finds clone of the specified original.
*
* @param original The original object whose clone we are looking for
* @return The clone or null, if there is none
*/
public Object getCloneForOriginal(Object original) {
for (Entry<Object, Object> entry : cloneToOriginals.entrySet()) {
// We use IdentityMap, so we can use ==
if (entry.getValue() == original) {
return entry.getKey();
}
}
return null;
}
public boolean hasChanges() {
return hasChanges || hasDeleted || hasNew;
}
void setHasChanges() {
this.hasChanges = true;
}
@Override
public CacheManager getLiveObjectCache() {
return parent.getLiveObjectCache();
}
UnitOfWorkChangeSet getUowChangeSet() {
return uowChangeSet;
}
@Override
public boolean isActive() {
return this.isActive;
}
/**
* Returns true if the given clone represents a newly created object. Otherwise returns false.
*
* @param clone Object
* @return boolean
*/
public boolean isObjectNew(Object clone) {
return clone != null && newObjectsCloneToOriginal.containsKey(clone);
}
/**
* Returns true if the given object is already managed.
*
* @param entity Object
* @return boolean
*/
@Override
public boolean isObjectManaged(Object entity) {
Objects.requireNonNull(entity);
return cloneMapping.contains(entity) && !deletedObjects.containsKey(entity) ||
newObjectsCloneToOriginal.containsKey(entity);
}
/**
* Persists changed value of the specified field.
*
* @param entity Entity with changes (the clone)
* @param f The field whose value has changed
* @throws IllegalStateException If this UoW is not in transaction
*/
public void attributeChanged(Object entity, Field f) {
if (!isInTransaction()) {
throw new IllegalStateException("This unit of work is not in a transaction.");
}
final Descriptor descriptor = getDescriptor(entity);
final EntityTypeImpl<Object> et = entityType((Class<Object>) entity.getClass());
et.getLifecycleListenerManager().invokePreUpdateCallbacks(entity);
storage.merge(entity, f, descriptor);
createAndRegisterChangeRecord(entity, et.getFieldSpecification(f.getName()), descriptor);
setHasChanges();
setIndirectObjectIfPresent(entity, f);
et.getLifecycleListenerManager().invokePostUpdateCallbacks(entity);
instanceDescriptors.get(entity).setLoaded(et.getFieldSpecification(f.getName()), LoadState.LOADED);
}
private void createAndRegisterChangeRecord(Object clone, FieldSpecification<?, ?> fieldSpec,
Descriptor descriptor) {
final Object orig = getOriginal(clone);
if (orig == null) {
return;
}
final ChangeRecord record = new ChangeRecordImpl(fieldSpec,
EntityPropertiesUtils.getFieldValue(fieldSpec.getJavaField(), clone));
preventCachingIfReferenceIsNotLoaded(record);
registerChangeRecord(clone, orig, descriptor, record);
}
private void preventCachingIfReferenceIsNotLoaded(ChangeRecord changeRecord) {
final Object newValue = changeRecord.getNewValue();
if (newValue != null && contains(newValue) && isLoaded(newValue) != LoadState.LOADED) {
changeRecord.preventCaching();
}
}
private void registerChangeRecord(Object clone, Object orig, Descriptor descriptor, ChangeRecord record) {
ObjectChangeSet chSet = uowChangeSet.getExistingObjectChanges(orig);
if (chSet == null) {
chSet = ChangeSetFactory.createObjectChangeSet(orig, clone, descriptor);
uowChangeSet.addObjectChangeSet(chSet);
}
chSet.addChangeRecord(record);
}
/**
* Merge the changes from this Unit of Work's change set into the server session.
*/
private void mergeChangesIntoParent() {
if (hasChanges()) {
mergeManager.mergeChangesFromChangeSet(uowChangeSet);
}
evictPossiblyUpdatedReferencesFromCache();
}
private void evictPossiblyUpdatedReferencesFromCache() {
cloneToOriginals.forEach((clone, orig) -> {
if (orig == null && !deletedObjects.containsKey(clone)) {
removeObjectFromCache(clone, getDescriptor(clone).getContext());
}
});
}
@Override
public <T> T mergeDetached(T entity, Descriptor descriptor) {
Objects.requireNonNull(entity, ErrorUtils.getNPXMessageSupplier("entity"));
Objects.requireNonNull(descriptor, ErrorUtils.getNPXMessageSupplier("descriptor"));
final Object id = getIdentifier(entity);
if (!storage.contains(id, entity.getClass(), descriptor)) {
registerNewObject(entity, descriptor);
return entity;
} else {
if (isIndividualManaged(id, entity) && !isSameType(id, entity)) {
throw individualAlreadyManaged(id);
}
return mergeDetachedInternal(entity, descriptor);
}
}
private boolean isSameType(Object id, Object entity) {
final Class<?> mergedType = entity.getClass();
final Object managed = keysToClones.containsKey(id) ? keysToClones.get(id) : newObjectsKeyToClone.get(id);
return managed != null && managed.getClass().isAssignableFrom(mergedType);
}
private <T> T mergeDetachedInternal(T entity, Descriptor descriptor) {
assert entity != null;
final EntityTypeImpl<T> et = (EntityTypeImpl<T>) entityType(entity.getClass());
final URI idUri = EntityPropertiesUtils.getIdentifier(entity, et);
final Object clone = getInstanceForMerge(idUri, et, descriptor);
try {
// Merge only the changed attributes
final ObjectChangeSet chSet = ChangeSetFactory.createObjectChangeSet(clone, entity, descriptor);
changeManager.calculateChanges(chSet);
if (chSet.hasChanges()) {
et.getLifecycleListenerManager().invokePreUpdateCallbacks(clone);
final DetachedInstanceMerger merger = new DetachedInstanceMerger(this);
merger.mergeChangesFromDetachedToManagedInstance(chSet, descriptor);
for (ChangeRecord record : chSet.getChanges()) {
AttributeModificationValidator.verifyCanModify(record.getAttribute());
preventCachingIfReferenceIsNotLoaded(record);
final Field field = record.getAttribute().getJavaField();
storage.merge(clone, field, descriptor);
}
et.getLifecycleListenerManager().invokePostUpdateCallbacks(clone);
uowChangeSet.addObjectChangeSet(copyChangeSet(chSet, getOriginal(clone), clone, descriptor));
}
} catch (OWLEntityExistsException e) {
unregisterObject(clone);
throw e;
}
if (cacheManager.contains(et.getJavaType(), idUri, descriptor)) {
cacheManager.evict(et.getJavaType(), idUri, descriptor.getContext());
}
setHasChanges();
checkForIndirectObjects(clone);
return et.getJavaType().cast(clone);
}
private <T> Object getInstanceForMerge(URI identifier, EntityType<T> et, Descriptor descriptor) {
if (keysToClones.containsKey(identifier)) {
return keysToClones.get(identifier);
}
final LoadingParameters<T> params = new LoadingParameters<>(et.getJavaType(), identifier, descriptor, true);
T original = storage.find(params);
assert original != null;
return registerExistingObject(original, descriptor);
}
private static ObjectChangeSet copyChangeSet(ObjectChangeSet changeSet, Object original, Object clone,
Descriptor descriptor) {
final ObjectChangeSet newChangeSet = ChangeSetFactory.createObjectChangeSet(original, clone, descriptor);
changeSet.getChanges().forEach(newChangeSet::addChangeRecord);
return newChangeSet;
}
private void registerEntityWithPersistenceContext(Object entity) {
Aspects.aspectOf(BeanListenerAspect.class).register(entity, this);
}
private void deregisterEntityFromPersistenceContext(Object entity) {
Aspects.aspectOf(BeanListenerAspect.class).deregister(entity);
}
@Override
public NamedQueryManager getNamedQueryManager() {
return parent.getNamedQueryManager();
}
@Override
public ResultSetMappingManager getResultSetMappingManager() {
return parent.getResultSetMappingManager();
}
@Override
public Object registerExistingObject(Object entity, Descriptor descriptor) {
return registerExistingObject(entity, descriptor, Collections.emptyList());
}
@Override
public Object registerExistingObject(Object entity, Descriptor descriptor, List<Consumer<Object>> postClone) {
if (entity == null) {
return null;
}
if (cloneToOriginals.containsValue(entity)) {
return getCloneForOriginal(entity);
}
final CloneConfiguration cloneConfig = new CloneConfiguration(descriptor);
postClone.forEach(cloneConfig::addPostRegisterHandler);
Object clone = cloneBuilder.buildClone(entity, cloneConfig);
assert clone != null;
registerClone(clone, entity, descriptor);
postClone.forEach(c -> c.accept(clone));
return clone;
}
private void registerClone(Object clone, Object original, Descriptor descriptor) {
cloneToOriginals.put(clone, original);
final Object identifier = EntityPropertiesUtils.getIdentifier(clone, getMetamodel());
keysToClones.put(identifier, clone);
instanceDescriptors
.put(clone, InstanceDescriptorFactory.create(clone, (EntityType<Object>) entityType(clone.getClass())));
registerEntityWithPersistenceContext(clone);
registerEntityWithOntologyContext(clone, descriptor);
}
/**
* Release this Unit of Work. Releasing an active Unit of Work with uncommitted changes causes all pending changes
* to be discarded.
*/
@Override
public void release() {
clear();
storage.close();
this.isActive = false;
LOG.debug("UnitOfWork released.");
}
@Override
public <T> void refreshObject(T object) {
Objects.requireNonNull(object);
if (!isObjectManaged(object)) {
throw new IllegalArgumentException(
"Cannot call refresh on an instance not managed by this persistence context.");
}
final EntityTypeImpl<T> et = entityType((Class<T>) object.getClass());
final URI idUri = EntityPropertiesUtils.getIdentifier(object, et);
final Descriptor descriptor = getDescriptor(object);
final LoadingParameters<T> params = new LoadingParameters<>(et.getJavaType(), idUri, descriptor, true);
params.bypassCache();
final ConnectionWrapper connection = acquireConnection();
try {
uowChangeSet.cancelObjectChanges(getOriginal(object));
T original = connection.find(params);
if (original == null) {
throw new EntityNotFoundException("Entity " + object + " no longer exists in the repository.");
}
T source = (T) cloneBuilder.buildClone(original, new CloneConfiguration(descriptor));
final ObjectChangeSet chSet = ChangeSetFactory.createObjectChangeSet(source, object, descriptor);
changeManager.calculateChanges(chSet);
new RefreshInstanceMerger(indirectWrapperHelper).mergeChanges(chSet);
revertTransactionalChanges(object, descriptor, chSet);
registerClone(object, original, descriptor);
et.getLifecycleListenerManager().invokePostLoadCallbacks(object);
} finally {
connection.close();
}
}
private <T> void revertTransactionalChanges(T object, Descriptor descriptor, ObjectChangeSet chSet) {
for (ChangeRecord change : chSet.getChanges()) {
storage.merge(object, change.getAttribute().getJavaField(),
descriptor.getAttributeDescriptor(change.getAttribute()));
}
}
@Override
public void registerNewObject(Object entity, Descriptor descriptor) {
Objects.requireNonNull(entity, ErrorUtils.getNPXMessageSupplier("entity"));
Objects.requireNonNull(descriptor, ErrorUtils.getNPXMessageSupplier("descriptor"));
registerNewObjectInternal(entity, descriptor);
}
/**
* Registers the specified entity for persist in this Unit of Work.
*
* @param entity The entity to register
* @param descriptor Entity descriptor, specifying optionally contexts into which the entity will be persisted
*/
private void registerNewObjectInternal(Object entity, Descriptor descriptor) {
final EntityTypeImpl<?> eType = entityType(entity.getClass());
eType.getLifecycleListenerManager().invokePrePersistCallbacks(entity);
Object id = getIdentifier(entity);
if (id == null) {
EntityPropertiesUtils.verifyIdentifierIsGenerated(entity, eType);
}
verifyCanPersist(id, entity, eType, descriptor);
storage.persist(id, entity, descriptor);
if (id == null) {
// If the ID was null, extract it from the entity. It is present now
id = getIdentifier(entity);
}
assert id != null;
// Original is null until commit
newObjectsCloneToOriginal.put(entity, null);
registerEntityWithPersistenceContext(entity);
registerEntityWithOntologyContext(entity, descriptor);
instanceDescriptors.put(entity, InstanceDescriptorFactory.createAllLoaded(entity, (EntityType<Object>) eType));
newObjectsKeyToClone.put(id, entity);
checkForIndirectObjects(entity);
this.hasNew = true;
eType.getLifecycleListenerManager().invokePostPersistCallbacks(entity);
}
private void verifyCanPersist(Object id, Object instance, EntityType<?> et, Descriptor descriptor) {
if (isIndividualManaged(id, instance) && !instance.getClass().isEnum()) {
throw individualAlreadyManaged(id);
}
if (storage.contains(id, instance.getClass(), descriptor)) {
throw new OWLEntityExistsException(
"Individual " + id + " of type " + et.getIRI() + " already exists in storage.");
}
}
private boolean isIndividualManaged(Object identifier, Object entity) {
return keysToClones.containsKey(identifier) ||
newObjectsKeyToClone.containsKey(identifier) && !cloneMapping.contains(entity);
}
@Override
public void removeObject(Object entity) {
assert entity != null;
if (!isObjectManaged(entity)) {
throw new IllegalArgumentException(
"Cannot remove entity which is not managed in the current persistence context.");
}
final EntityTypeImpl<?> et = entityType(entity.getClass());
et.getLifecycleListenerManager().invokePreRemoveCallbacks(entity);
final Object primaryKey = getIdentifier(entity);
final Descriptor descriptor = getDescriptor(entity);
if (hasNew && newObjectsCloneToOriginal.containsKey(entity)) {
unregisterObject(entity);
newObjectsKeyToClone.remove(primaryKey);
} else {
deletedObjects.put(entity, entity);
this.hasDeleted = true;
}
storage.remove(primaryKey, et.getJavaType(), descriptor);
et.getLifecycleListenerManager().invokePostRemoveCallbacks(entity);
}
@Override
public void restoreRemovedObject(Object entity) {
assert deletedObjects.containsKey(entity);
deletedObjects.remove(entity);
final Object id = getIdentifier(entity);
storage.persist(id, entity, getDescriptor(entity));
}
/**
* Remove the registered object from this Unit of Work.
*
* @param object Clone of the original object
*/
public void unregisterObject(Object object) {
if (object == null) {
return;
}
final Object original = cloneToOriginals.remove(object);
keysToClones.remove(EntityPropertiesUtils.getIdentifier(object, getMetamodel()));
deletedObjects.remove(object);
if (hasNew) {
newObjectsCloneToOriginal.remove(object);
}
if (original != null) {
cloneBuilder.removeVisited(original, repoMap.getEntityDescriptor(object));
}
removeIndirectCollections(object);
deregisterEntityFromPersistenceContext(object);
unregisterEntityFromOntologyContext(object);
}
@Override
public boolean shouldReleaseAfterCommit() {
return shouldReleaseAfterCommit;
}
public void setShouldClearAfterCommit(boolean shouldClearCache) {
this.shouldClearCacheAfterCommit = shouldClearCache;
}
public void setEntityManager(AbstractEntityManager entityManager) {
this.entityManager = entityManager;
}
@Override
public void writeUncommittedChanges() {
if (hasChanges()) {
commitUnitOfWork();
}
}
@Override
public MetamodelImpl getMetamodel() {
return parent.getMetamodel();
}
private <T> EntityTypeImpl<T> entityType(Class<T> cls) {
return getMetamodel().entity(cls);
}
@Override
public boolean isEntityType(Class<?> cls) {
return parent.isEntityType(cls);
}
@Override
public boolean isInTransaction() {
return entityManager != null && entityManager.getTransaction().isActive();
}
/**
* Returns {@code true} if this UoW is currently committing changes.
*
* @return Whether this UoW is in the commit phase
*/
public boolean isInCommit() {
return inCommit;
}
@Override
public <T> void loadEntityField(T entity, Field field) {
Objects.requireNonNull(entity, ErrorUtils.getNPXMessageSupplier("entity"));
Objects.requireNonNull(field, ErrorUtils.getNPXMessageSupplier("field"));
assert field.getDeclaringClass().isAssignableFrom(entity.getClass());
final Descriptor entityDescriptor = getDescriptor(entity);
if (!instanceDescriptors.containsKey(entity)) {
throw new OWLPersistenceException(
"Unable to find repository identifier for entity " + entity + ". Is it managed by this UoW?");
}
final InstanceDescriptor<?> instanceDescriptor = instanceDescriptors.get(entity);
final FieldSpecification<?, ?> fieldSpec = entityType((Class<Object>) entity.getClass())
.getFieldSpecification(field.getName());
if (instanceDescriptor.isLoaded(fieldSpec) == LoadState.LOADED) {
return;
}
storage.loadFieldValue(entity, field, entityDescriptor);
final Object orig = EntityPropertiesUtils.getFieldValue(field, entity);
final Object entityOriginal = getOriginal(entity);
if (entityOriginal != null) {
EntityPropertiesUtils.setFieldValue(field, entityOriginal, orig);
}
final Descriptor fieldDescriptor = getFieldDescriptor(entity, field, entityDescriptor);
final Object clone = cloneLoadedFieldValue(entity, field, fieldDescriptor, orig);
EntityPropertiesUtils.setFieldValue(field, entity, clone);
instanceDescriptors.get(entity).setLoaded(fieldSpec, LoadState.LOADED);
}
private <T> Descriptor getFieldDescriptor(T entity, Field field, Descriptor entityDescriptor) {
final EntityType<?> et = entityType(entity.getClass());
final FieldSpecification<?, ?> fieldSpec = et.getFieldSpecification(field.getName());
return entityDescriptor.getAttributeDescriptor(fieldSpec);
}
private <T> Object cloneLoadedFieldValue(T entity, Field field, final Descriptor fieldDescriptor,
final Object fieldValueOrig) {
Object clone;
if (fieldValueOrig == null) {
clone = null;
} else {
if (isEntityType(field.getType())) {
clone = registerExistingObject(fieldValueOrig, fieldDescriptor);
putObjectIntoCache(getIdentifier(clone), fieldValueOrig, fieldDescriptor);
} else {
clone = cloneBuilder.buildClone(entity, field, fieldValueOrig, fieldDescriptor);
}
}
return clone;
}
@Override
public void removeObjectFromCache(Object toRemove, URI context) {
Objects.requireNonNull(toRemove, ErrorUtils.getNPXMessageSupplier("toRemove"));
cacheManager.evict(toRemove.getClass(), getIdentifier(toRemove), context);
}
@Override
public boolean isConsistent(URI context) {
return storage.isConsistent(context);
}
@Override
public List<URI> getContexts() {
return storage.getContexts();
}
@Override
public LoadState isLoaded(Object entity, String attributeName) {
Objects.requireNonNull(entity);
final FieldSpecification<?, ?> fs = entityType(entity.getClass()).getFieldSpecification(attributeName);
return instanceDescriptors.containsKey(entity) ? instanceDescriptors.get(entity).isLoaded(fs) :
LoadState.UNKNOWN;
}
@Override
public LoadState isLoaded(Object entity) {
Objects.requireNonNull(entity);
return instanceDescriptors.containsKey(entity) ? instanceDescriptors.get(entity).isLoaded() : LoadState.UNKNOWN;
}
@Override
public void setUseTransactionalOntologyForQueryProcessing() {
this.useTransactionalOntology = true;
}
@Override
public boolean useTransactionalOntologyForQueryProcessing() {
return useTransactionalOntology;
}
@Override
public void setUseBackupOntologyForQueryProcessing() {