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EntityManagerImpl.java
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EntityManagerImpl.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
*
* 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.
*
* 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.model;
import cz.cvut.kbss.jopa.exceptions.OWLPersistenceException;
import cz.cvut.kbss.jopa.exceptions.TransactionRequiredException;
import cz.cvut.kbss.jopa.model.annotations.CascadeType;
import cz.cvut.kbss.jopa.model.annotations.FetchType;
import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
import cz.cvut.kbss.jopa.model.descriptors.EntityDescriptor;
import cz.cvut.kbss.jopa.model.metamodel.Attribute;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.model.metamodel.Metamodel;
import cz.cvut.kbss.jopa.model.query.Query;
import cz.cvut.kbss.jopa.model.query.TypedQuery;
import cz.cvut.kbss.jopa.sessions.ServerSession;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import cz.cvut.kbss.jopa.transactions.EntityTransaction;
import cz.cvut.kbss.jopa.transactions.EntityTransactionWrapper;
import cz.cvut.kbss.jopa.transactions.TransactionWrapper;
import cz.cvut.kbss.jopa.utils.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.URI;
import java.util.*;
public class EntityManagerImpl extends AbstractEntityManager implements Wrapper {
private static final Logger LOG = LoggerFactory.getLogger(EntityManagerImpl.class);
private static final Object MAP_VALUE = new Object();
private EntityManagerFactoryImpl emf;
private boolean open;
private TransactionWrapper transaction;
private UnitOfWorkImpl persistenceContext;
private ServerSession serverSession;
private final Configuration configuration;
private final Map<Object, Object> cascadingRegistry = new IdentityHashMap<>();
EntityManagerImpl(EntityManagerFactoryImpl emf, Configuration configuration, ServerSession serverSession) {
this.emf = emf;
this.serverSession = serverSession;
this.configuration = configuration;
setTransactionWrapper();
this.open = true;
}
public enum State {
MANAGED, MANAGED_NEW, NOT_MANAGED, REMOVED
}
@Override
public void persist(final Object entity) {
final Descriptor d = new EntityDescriptor();
persist(entity, d);
}
@Override
public void persist(final Object entity, final Descriptor descriptor) {
LOG.trace("Persisting {}", entity);
try {
Objects.requireNonNull(entity, ErrorUtils.getNPXMessageSupplier("entity"));
Objects.requireNonNull(descriptor, ErrorUtils.getNPXMessageSupplier("descriptor"));
ensureOpen();
checkClassIsValidEntity(entity.getClass());
switch (getState(entity, descriptor)) {
case NOT_MANAGED:
getCurrentPersistenceContext().registerNewObject(entity, descriptor);
// Intentional fall-through
case MANAGED:
cascadePersist(entity, descriptor);
break;
case REMOVED:
getCurrentPersistenceContext().revertObject(entity);
break;
default:
break;
}
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
}
}
private void checkClassIsValidEntity(Class<?> cls) {
getMetamodel().entity(cls);
}
private void registerProcessedInstance(Object instance) {
cascadingRegistry.put(instance, MAP_VALUE);
}
private boolean isCascadingCycle(Object instance) {
return cascadingRegistry.containsKey(instance);
}
private void resetCascadingRegistry() {
cascadingRegistry.clear();
}
private void markTransactionForRollback() {
if (getTransaction().isActive()) {
getTransaction().setRollbackOnly();
}
}
private void cascadePersist(final Object entity, final Descriptor descriptor) {
new OneLevelCascadeExplorer() {
@Override
protected void exploreCascaded(Attribute<?, ?> at, Object o) {
try {
Object ox = EntityPropertiesUtils.getAttributeValue(at, o);
LOG.trace("object={}, attribute={}, value={}", o, at.getName(), ox);
if (ox == null) {
return;
}
final Descriptor attDescriptor = descriptor.getAttributeDescriptor(at);
if (at.isCollection()) {
for (final Object ox2 : (Collection<?>) ox) {
persist(ox2, attDescriptor);
}
} else {
persist(ox, attDescriptor);
}
} catch (Exception e) {
markTransactionForRollback();
throw new OWLPersistenceException(
"A problem occurred when persisting attribute " + at.getName()
+ " of with value " + o + " of object " + entity, e);
}
}
}.start(this, entity, CascadeType.PERSIST);
}
@Override
public <T> T merge(final T entity) {
final Descriptor d = new EntityDescriptor();
return merge(entity, d);
}
@Override
public <T> T merge(final T entity, final Descriptor descriptor) {
try {
Objects.requireNonNull(entity, ErrorUtils.getNPXMessageSupplier("entity"));
Objects.requireNonNull(descriptor, ErrorUtils.getNPXMessageSupplier("descriptor"));
ensureOpen();
checkClassIsValidEntity(entity.getClass());
return mergeInternal(entity, descriptor);
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
} finally {
resetCascadingRegistry();
}
}
/**
* Merges state of the specified entity into the current persistence context. </p>
*
* @param entity Entity instance
* @param descriptor Contains information about contexts into which the entity and its field should be merged
* @return Managed instance of the merged entity
*/
private <T> T mergeInternal(final T entity, final Descriptor descriptor) {
assert entity != null;
assert descriptor != null;
LOG.trace("Merging {}.", entity);
if (isCascadingCycle(entity)) {
LOG.warn("Merge cascading cycle detected in entity {}.", entity);
return (T) getCurrentPersistenceContext().getCloneForOriginal(entity);
}
switch (getState(entity, descriptor)) {
case MANAGED_NEW:
case MANAGED:
registerProcessedInstance(entity);
cascadeMerge(entity, entity, descriptor);
return entity;
case NOT_MANAGED:
final T merged = getCurrentPersistenceContext().mergeDetached(entity, descriptor);
registerProcessedInstance(entity);
cascadeMerge(merged, entity, descriptor);
return merged;
case REMOVED:
default:
throw new IllegalArgumentException("Cannot merge instance which is not an entity or is removed.");
}
}
private <T> void cascadeMerge(T merged, T toMerge, Descriptor descriptor) {
new OneLevelMergeCascadeExplorer() {
@Override
protected void exploreCascaded(Attribute<?, ?> at, Object merged, Object toMerge) {
final Descriptor attDescriptor = descriptor.getAttributeDescriptor(at);
mergeX(at, merged, toMerge, attDescriptor);
}
}.start(this, merged, toMerge);
}
private void mergeX(Attribute<?, ?> at, Object merged, Object toMerge, Descriptor descriptor) {
Object attVal = EntityPropertiesUtils.getAttributeValue(at, toMerge);
if (attVal == null) {
return;
}
if (at.isCollection()) {
Collection c = (Collection) attVal;
Collection result = CollectionFactory.createInstance(c);
for (final Object ox2 : c) {
result.add(mergeInternal(ox2, descriptor));
}
attVal = getCurrentPersistenceContext().createIndirectCollection(result, merged, at.getJavaField());
} else {
attVal = mergeInternal(attVal, descriptor);
}
EntityPropertiesUtils.setFieldValue(at.getJavaField(), merged, attVal);
}
@Override
public void remove(Object object) {
try {
ensureOpen();
Objects.requireNonNull(object);
checkClassIsValidEntity(object.getClass());
if (isCascadingCycle(object)) {
LOG.warn("Remove cascading cycle detected in instance {}.", object);
return;
}
switch (getState(object)) {
case MANAGED_NEW:
case MANAGED:
getCurrentPersistenceContext().removeObject(object);
registerProcessedInstance(object);
// Intentional fall-through
case REMOVED:
new SimpleOneLevelCascadeExplorer() {
@Override
protected void runCascadedForEach(Object ox2) {
remove(ox2);
}
}.start(this, object, CascadeType.REMOVE);
break;
default:
throw new IllegalArgumentException("Entity " + object + " is not managed and cannot be removed.");
}
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
} finally {
resetCascadingRegistry();
}
}
@Override
public <T> T find(Class<T> cls, Object primaryKey) {
final EntityDescriptor d = new EntityDescriptor();
return find(cls, primaryKey, d);
}
@Override
public <T> T find(Class<T> cls, Object primaryKey, Descriptor descriptor) {
try {
Objects.requireNonNull(cls, ErrorUtils.getNPXMessageSupplier("cls"));
Objects.requireNonNull(primaryKey, ErrorUtils.getNPXMessageSupplier("primaryKey"));
Objects.requireNonNull(descriptor, ErrorUtils.getNPXMessageSupplier("descriptor"));
ensureOpen();
checkClassIsValidEntity(cls);
LOG.trace("Finding instance of {} with identifier {} in context ", cls, primaryKey, descriptor);
final URI uri = (primaryKey instanceof URI) ? (URI) primaryKey : URI.create(primaryKey.toString());
return getCurrentPersistenceContext().readObject(cls, uri, descriptor);
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
}
}
@Override
public void flush() {
try {
ensureOpen();
LOG.trace("Flushing changes...");
if (!getTransaction().isActive()) {
throw new TransactionRequiredException("Cannot flush entity manager outside of a transaction.");
}
this.getCurrentPersistenceContext().writeUncommittedChanges();
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
}
}
@Override
public void refresh(Object entity) {
try {
ensureOpen();
Objects.requireNonNull(entity);
checkClassIsValidEntity(entity.getClass());
this.getCurrentPersistenceContext().refreshObject(entity);
new SimpleOneLevelCascadeExplorer() {
@Override
protected void runCascadedForEach(Object ox2) {
refresh(ox2);
}
}.start(this, entity, CascadeType.REFRESH);
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
}
}
@Override
public void clear() {
try {
ensureOpen();
getCurrentPersistenceContext().clear();
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
}
}
@Override
public void detach(Object entity) {
try {
ensureOpen();
switch (getState(entity)) {
case MANAGED_NEW:
case MANAGED:
getCurrentPersistenceContext().unregisterObject(entity);
new SimpleOneLevelCascadeExplorer() {
@Override
protected void runCascadedForEach(Object ox2) {
detach(ox2);
}
}.start(this, entity, CascadeType.DETACH);
break;
default:
break;
}
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
}
}
@Override
public boolean contains(Object entity) {
try {
ensureOpen();
Objects.requireNonNull(entity);
checkClassIsValidEntity(entity.getClass());
return getCurrentPersistenceContext().contains(entity);
} catch (RuntimeException e) {
markTransactionForRollback();
throw e;
}
}
@Override
public void close() {
ensureOpen();
removeCurrentPersistenceContext();
emf.entityManagerClosed(this);
open = false;
}
@Override
public boolean isOpen() {
return open;
}
@Override
public EntityTransaction getTransaction() {
return transaction.getTransaction();
}
@Override
public EntityManagerFactoryImpl getEntityManagerFactory() {
return emf;
}
@Override
public Metamodel getMetamodel() {
return emf.getMetamodel();
}
@Override
public boolean isLoaded(final Object object, final String attributeName) {
Objects.requireNonNull(object);
Objects.requireNonNull(attributeName);
if (!contains(object)) {
return false;
}
final FieldSpecification<?, ?> fieldSpec = getMetamodel().entity(object.getClass())
.getFieldSpecification(attributeName);
// This is not correct, as lazily loaded fields can be set to null, but as long as we do not have any representation
// of the loaded state of an entity, this will have to do
return fieldSpec.getFetchType() == FetchType.EAGER ||
EntityPropertiesUtils.getFieldValue(fieldSpec.getJavaField(), object) != null;
}
@Override
public Query createQuery(String qlString) {
final QueryImpl q = getCurrentPersistenceContext().createQuery(qlString);
q.setRollbackOnlyMarker(this::markTransactionForRollback);
return q;
}
@Override
public <T> TypedQuery<T> createQuery(String query, Class<T> resultClass) {
final TypedQueryImpl<T> q = getCurrentPersistenceContext().createQuery(query, resultClass);
q.setRollbackOnlyMarker(this::markTransactionForRollback);
return q;
}
@Override
public Query createNativeQuery(String sparqlString) {
final QueryImpl q = getCurrentPersistenceContext().createNativeQuery(sparqlString);
q.setRollbackOnlyMarker(this::markTransactionForRollback);
return q;
}
@Override
public <T> TypedQuery<T> createNativeQuery(String sparqlString, Class<T> resultClass) {
final TypedQueryImpl<T> q = getCurrentPersistenceContext().createNativeQuery(sparqlString, resultClass);
q.setRollbackOnlyMarker(this::markTransactionForRollback);
return q;
}
@Override
public Query createNativeQuery(String sparqlString, String resultSetMapping) {
final QueryImpl q = getCurrentPersistenceContext().createNativeQuery(sparqlString, resultSetMapping);
q.setRollbackOnlyMarker(this::markTransactionForRollback);
return q;
}
@Override
public Query createNamedQuery(String name) {
final QueryImpl q = getCurrentPersistenceContext().createNamedQuery(name);
q.setRollbackOnlyMarker(this::markTransactionForRollback);
return q;
}
@Override
public <T> TypedQuery<T> createNamedQuery(String name, Class<T> resultClass) {
final TypedQueryImpl<T> q = getCurrentPersistenceContext().createNamedQuery(name, resultClass);
q.setRollbackOnlyMarker(this::markTransactionForRollback);
return q;
}
@Override
public boolean isConsistent(URI context) {
return getCurrentPersistenceContext().isConsistent(context);
}
@Override
public List<URI> getContexts() {
return getCurrentPersistenceContext().getContexts();
}
@Override
public void setUseTransactionalOntologyForQueryProcessing() {
getCurrentPersistenceContext().setUseTransactionalOntologyForQueryProcessing();
}
@Override
public boolean useTransactionalOntologyForQueryProcessing() {
return getCurrentPersistenceContext().useTransactionalOntologyForQueryProcessing();
}
@Override
public void setUseBackupOntologyForQueryProcessing() {
getCurrentPersistenceContext().setUseBackupOntologyForQueryProcessing();
}
@Override
public boolean useBackupOntologyForQueryProcessing() {
return getCurrentPersistenceContext().useBackupOntologyForQueryProcessing();
}
@Override
public <T> T unwrap(Class<T> cls) {
if (cls.isAssignableFrom(this.getClass())) {
return cls.cast(this);
}
return getCurrentPersistenceContext().unwrap(cls);
}
@Override
public Object getDelegate() {
return unwrap(EntityManagerImpl.class);
}
private void ensureOpen() {
if (!isOpen()) {
throw new OWLPersistenceException("The entity manager is closed !");
}
}
private State getState(Object entity) {
return getCurrentPersistenceContext().getState(entity);
}
private State getState(Object entity, Descriptor descriptor) {
return getCurrentPersistenceContext().getState(entity, descriptor);
}
@Override
protected void finalize() throws Throwable {
if (isOpen()) {
close();
}
super.finalize();
}
@Override
public UnitOfWorkImpl getCurrentPersistenceContext() {
if (this.persistenceContext == null) {
this.persistenceContext = (UnitOfWorkImpl) serverSession.acquireUnitOfWork();
persistenceContext.setEntityManager(this);
}
return this.persistenceContext;
}
/**
* Called from EntityTransaction in case of a rollback. Releasing the UoW is up to the EntityTransaction.
*/
@Override
public void removeCurrentPersistenceContext() {
if (persistenceContext != null && persistenceContext.isActive()) {
persistenceContext.release();
}
this.persistenceContext = null;
}
@Override
public void transactionStarted(EntityTransaction t) {
this.serverSession.transactionStarted(t, this);
}
@Override
public void transactionFinished(EntityTransaction t) {
this.serverSession.transactionFinished(t);
}
/**
* Since we support only EntityTransactions, we set the TransactionWrapper to EntityTransactionWrapper.
* <p>
* In the future, if JTA transactions are supported, JTATransactionWrapper should be set instead of the
* EntityTransactionWrapper.
*/
private void setTransactionWrapper() {
this.transaction = new EntityTransactionWrapper(this);
}
@Override
public Configuration getConfiguration() {
return configuration;
}
}