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BeanListenerAspect.java
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BeanListenerAspect.java
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/**
* Copyright (C) 2019 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.model;
import cz.cvut.kbss.jopa.exceptions.AttributeModificationForbiddenException;
import cz.cvut.kbss.jopa.exceptions.InferredAttributeModifiedException;
import cz.cvut.kbss.jopa.exceptions.OWLPersistenceException;
import cz.cvut.kbss.jopa.model.metamodel.AbstractAttribute;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
import cz.cvut.kbss.jopa.sessions.UnitOfWorkImpl;
import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Field;
@Aspect
public class BeanListenerAspect {
private static final Logger LOG = LoggerFactory.getLogger(BeanListenerAspect.class);
public interface Manageable {
void setPersistenceContext(UnitOfWorkImpl uow);
UnitOfWorkImpl getPersistenceContext();
}
public static class ManageableImpl implements Manageable {
private transient UnitOfWorkImpl persistenceContext;
@Override
public void setPersistenceContext(UnitOfWorkImpl uow) {
this.persistenceContext = uow;
}
@Override
public UnitOfWorkImpl getPersistenceContext() {
return persistenceContext;
}
}
@DeclareMixin(value = "!is(InterfaceType) && (@cz.cvut.kbss.jopa.model.annotations.OWLClass *)")
public static Manageable createImpl() {
return new ManageableImpl();
}
@Pointcut("get( @(cz.cvut.kbss.jopa.model.annotations.OWLObjectProperty " +
"|| cz.cvut.kbss.jopa.model.annotations.OWLDataProperty " +
"|| cz.cvut.kbss.jopa.model.annotations.OWLAnnotationProperty " +
"|| cz.cvut.kbss.jopa.model.annotations.Types " +
"|| cz.cvut.kbss.jopa.model.annotations.Properties ) * * ) " +
"&& (within(@cz.cvut.kbss.jopa.model.annotations.OWLClass *) || within(@cz.cvut.kbss.jopa.model.annotations.MappedSuperclass *))")
void getter() {
}
@Pointcut("set( @(cz.cvut.kbss.jopa.model.annotations.OWLObjectProperty " +
"|| cz.cvut.kbss.jopa.model.annotations.OWLDataProperty " +
"|| cz.cvut.kbss.jopa.model.annotations.OWLAnnotationProperty " +
"|| cz.cvut.kbss.jopa.model.annotations.Types || cz.cvut.kbss.jopa.model.annotations.Properties ) * * ) " +
"&& (within(@cz.cvut.kbss.jopa.model.annotations.OWLClass *) || within(@cz.cvut.kbss.jopa.model.annotations.MappedSuperclass *))")
void setter() {
}
/**
* Ties the specified instance to its persistence context, so that the advices can identify it easily.
*
* @param instance The managed instance
* @param persistenceContext Persistence context which is managing it
*/
public void register(Object instance, UnitOfWorkImpl persistenceContext) {
((Manageable) instance).setPersistenceContext(persistenceContext);
}
/**
* Disconnects the specified instance from its persistence context.
*
* @param instance The instance to remove
* @see #register(Object, UnitOfWorkImpl)
*/
public void deregister(Object instance) {
((Manageable) instance).setPersistenceContext(null);
}
@AfterReturning("setter()")
public void afterSetter(JoinPoint thisJoinPoint) {
// Persist changes done during transaction and check for inferred attribute modification
final Object entity = thisJoinPoint.getTarget();
if (!(entity instanceof Manageable)) {
return;
}
final UnitOfWorkImpl persistenceContext = ((Manageable) entity).getPersistenceContext();
if (persistenceContext == null || !persistenceContext.isInTransaction()) {
return;
}
try {
final FieldSpecification<?, ?> fieldSpec = getFieldSpecification(entity,
thisJoinPoint.getSignature().getName(), persistenceContext);
verifyCanModify(fieldSpec);
persistenceContext.attributeChanged(entity, fieldSpec.getJavaField());
} catch (SecurityException e) {
LOG.error(e.getMessage(), e);
throw new OWLPersistenceException(e.getMessage());
}
}
private FieldSpecification<?, ?> getFieldSpecification(Object entity, String fieldName,
UnitOfWorkImpl persistenceContext) {
final EntityType<?> et = persistenceContext.getMetamodel().entity(entity.getClass());
assert et != null;
return et.getFieldSpecification(fieldName);
}
private void verifyCanModify(FieldSpecification<?, ?> fieldSpec) {
if (fieldSpec.isInferred()) {
throw new InferredAttributeModifiedException(
String.format("Field %s may contain inferences and cannot be modified.", fieldSpec));
}
if (fieldSpec instanceof AbstractAttribute && ((AbstractAttribute) fieldSpec).isLexicalForm()) {
throw new AttributeModificationForbiddenException(
String.format("Field %s is configured to contain lexical form of literals and cannot be modified.",
fieldSpec));
}
}
@Before("getter()")
public void beforeGetter(JoinPoint thisJoinPoint) {
// Load lazy loaded entity field
final Object entity = thisJoinPoint.getTarget();
if (!(entity instanceof Manageable)) {
return;
}
final UnitOfWorkImpl persistenceContext = ((Manageable) entity).getPersistenceContext();
if (persistenceContext == null || !persistenceContext.contains(entity)) {
return;
}
final FieldSpecification<?, ?> fieldSpec = getFieldSpecification(entity, thisJoinPoint.getSignature().getName(),
persistenceContext);
final Field field = fieldSpec.getJavaField();
if (EntityPropertiesUtils.isFieldTransient(field)) {
return;
}
persistenceContext.loadEntityField(entity, field);
}
}