/** @since 3.1 */
@Override
public <T extends Persistent> T localObject(T objectFromAnotherContext) {
if (objectFromAnotherContext == null) {
throw new NullPointerException("Null object argument");
}
ObjectId id = objectFromAnotherContext.getObjectId();
// first look for the ID in the local GraphManager
synchronized (getGraphManager()) {
T localObject = (T) getGraphManager().getNode(id);
if (localObject != null) {
return localObject;
}
// create a hollow object, optimistically assuming that the ID we
// got from
// 'objectFromAnotherContext' is a valid ID either in the parent
// context or in
// the DB. This essentially defers possible FaultFailureExceptions.
ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(id.getEntityName());
Persistent persistent = (Persistent) descriptor.createObject();
persistent.setObjectContext(this);
persistent.setObjectId(id);
persistent.setPersistenceState(PersistenceState.HOLLOW);
getGraphManager().registerNode(id, persistent);
return (T) persistent;
}
}
/**
* Instantiates a new object and registers it with this context. Object class is determined from
* the mapped entity. Object class must have a default constructor.
*
* <p><i>Note: in most cases {@link #newObject(Class)} method should be used, however this method
* is helpful when generic persistent classes are used.</i>
*
* @since 3.0
*/
public Persistent newObject(String entityName) {
ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(entityName);
if (descriptor == null) {
throw new IllegalArgumentException("Invalid entity name: " + entityName);
}
Persistent object;
try {
object = (Persistent) descriptor.createObject();
} catch (Exception ex) {
throw new CayenneRuntimeException("Error instantiating object.", ex);
}
// this will initialize to-many lists
descriptor.injectValueHolders(object);
ObjectId id = new ObjectId(entityName);
// note that the order of initialization of persistence artifacts below
// is
// important - do not change it lightly
object.setObjectId(id);
injectInitialValue(object);
return object;
}
@Override
public void nodeRemoved(Object nodeId) {
ObjectId id = (ObjectId) nodeId;
final MutableObjectChange objectChangeSet = changeSet.getOrCreate(id, ObjectChangeType.DELETE);
// TODO: rewrite with SelectById query after Cayenne upgrade
ObjectIdQuery query = new ObjectIdQuery(id, true, ObjectIdQuery.CACHE);
QueryResponse result = channel.onQuery(null, query);
@SuppressWarnings("unchecked")
List<DataRow> rows = result.firstList();
if (rows.isEmpty()) {
LOGGER.warn(
"No DB snapshot for object to be deleted, no changes will be recorded. ID: " + id);
return;
}
final DataRow row = rows.get(0);
ClassDescriptor descriptor = channel.getEntityResolver().getClassDescriptor(id.getEntityName());
final PostCommitEntity entity = entityFactory.getEntity(id);
descriptor.visitProperties(
new PropertyVisitor() {
@Override
public boolean visitAttribute(AttributeProperty property) {
if (!entity.isIncluded(property.getName())) {
return true;
}
Object value;
if (entity.isConfidential(property.getName())) {
value = Confidential.getInstance();
} else {
String key = property.getAttribute().getDbAttributeName();
value = row.get(key);
}
if (value != null) {
objectChangeSet.attributeChanged(property.getName(), value, null);
}
return true;
}
@Override
public boolean visitToOne(ToOneProperty property) {
// TODO record FK changes?
return true;
}
@Override
public boolean visitToMany(ToManyProperty property) {
return true;
}
});
}
private PostCommitEntity createDescriptor(String entityName) {
EntityResolver entityResolver = getEntityResolver();
ClassDescriptor classDescriptor = entityResolver.getClassDescriptor(entityName);
Auditable annotation = classDescriptor.getObjectClass().getAnnotation(Auditable.class);
if (annotation == null) {
return BLOCKED_ENTITY;
}
ObjEntity entity = entityResolver.getObjEntity(entityName);
return new DefaultPostCommitEntity(
entity, annotation.ignoredProperties(), annotation.confidential());
}
/**
* Returns a map key for a given to-many map relationship and a target object.
*
* @since 3.0
*/
protected Object getMapKey(String relationshipName, Object value) {
EntityResolver resolver = objectContext.getEntityResolver();
ClassDescriptor descriptor = resolver.getClassDescriptor(objectId.getEntityName());
if (descriptor == null) {
throw new IllegalStateException("DataObject's entity is unmapped, objectId: " + objectId);
}
PropertyDescriptor property = descriptor.getProperty(relationshipName);
if (property instanceof ToManyMapProperty) {
return ((ToManyMapProperty) property).getMapKey(value);
}
throw new IllegalArgumentException(
"Relationship '" + relationshipName + "' is not a to-many Map");
}
/**
* An internal version of {@link #localObject(Object)} that operates on ObjectId instead of
* Persistent, and wouldn't attempt to look up an object in the parent channel.
*
* @since 3.1
*/
Persistent findOrCreateObject(ObjectId id) {
if (id == null) {
throw new IllegalArgumentException("Null ObjectId");
}
// have to synchronize almost the entire method to prevent multiple
// threads from
// messing up dataobjects per CAY-845. Originally only parts of "else"
// were
// synchronized, but we had to expand the lock scope to ensure
// consistent
// behavior.
synchronized (getGraphManager()) {
Persistent cachedObject = (Persistent) getGraphManager().getNode(id);
// return an existing object
if (cachedObject != null) {
int state = cachedObject.getPersistenceState();
// TODO: Andrus, 1/24/2006 implement smart merge for modified
// objects...
if (state != PersistenceState.MODIFIED && state != PersistenceState.DELETED) {
ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(id.getEntityName());
descriptor.injectValueHolders(cachedObject);
}
return cachedObject;
}
// create and register a hollow object
ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(id.getEntityName());
Persistent localObject = (Persistent) descriptor.createObject();
localObject.setObjectContext(this);
localObject.setObjectId(id);
getGraphManager().registerNode(id, localObject);
localObject.setPersistenceState(PersistenceState.HOLLOW);
return localObject;
}
}
/**
* Registers a transient object with the context, recursively registering all transient persistent
* objects attached to this object via relationships.
*
* <p><i>Note that since 3.0 this method takes Object as an argument instead of a {@link
* DataObject}.</i>
*
* @param object new object that needs to be made persistent.
*/
@Override
public void registerNewObject(Object object) {
if (object == null) {
throw new NullPointerException("Can't register null object.");
}
ObjEntity entity = getEntityResolver().getObjEntity((Persistent) object);
if (entity == null) {
throw new IllegalArgumentException(
"Can't find ObjEntity for Persistent class: "
+ object.getClass().getName()
+ ", class is likely not mapped.");
}
final Persistent persistent = (Persistent) object;
// sanity check - maybe already registered
if (persistent.getObjectId() != null) {
if (persistent.getObjectContext() == this) {
// already registered, just ignore
return;
} else if (persistent.getObjectContext() != null) {
throw new IllegalStateException(
"Persistent is already registered with another DataContext. "
+ "Try using 'localObjects()' instead.");
}
} else {
persistent.setObjectId(new ObjectId(entity.getName()));
}
ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(entity.getName());
if (descriptor == null) {
throw new IllegalArgumentException("Invalid entity name: " + entity.getName());
}
injectInitialValue(object);
// now we need to find all arc changes, inject missing value holders and
// pull in
// all transient connected objects
descriptor.visitProperties(
new PropertyVisitor() {
public boolean visitToMany(ToManyProperty property) {
property.injectValueHolder(persistent);
if (!property.isFault(persistent)) {
Object value = property.readProperty(persistent);
Collection<Map.Entry> collection =
(value instanceof Map) ? ((Map) value).entrySet() : (Collection) value;
Iterator<Map.Entry> it = collection.iterator();
while (it.hasNext()) {
Object target = it.next();
if (target instanceof Persistent) {
Persistent targetDO = (Persistent) target;
// make sure it is registered
registerNewObject(targetDO);
getObjectStore()
.arcCreated(
persistent.getObjectId(), targetDO.getObjectId(), property.getName());
}
}
}
return true;
}
public boolean visitToOne(ToOneProperty property) {
Object target = property.readPropertyDirectly(persistent);
if (target instanceof Persistent) {
Persistent targetDO = (Persistent) target;
// make sure it is registered
registerNewObject(targetDO);
getObjectStore()
.arcCreated(persistent.getObjectId(), targetDO.getObjectId(), property.getName());
}
return true;
}
public boolean visitAttribute(AttributeProperty property) {
return true;
}
});
}
/**
* Returns a DataRow reflecting current, possibly uncommitted, object state.
*
* <p><strong>Warning:</strong> This method will return a partial snapshot if an object or one of
* its related objects that propagate their keys to this object have temporary ids. DO NOT USE
* this method if you expect a DataRow to represent a complete object state.
*
* @since 1.1
*/
public DataRow currentSnapshot(final Persistent object) {
// for a HOLLOW object return snapshot from cache
if (object.getPersistenceState() == PersistenceState.HOLLOW
&& object.getObjectContext() != null) {
return getObjectStore().getSnapshot(object.getObjectId());
}
ObjEntity entity = getEntityResolver().getObjEntity(object);
final ClassDescriptor descriptor = getEntityResolver().getClassDescriptor(entity.getName());
final DataRow snapshot = new DataRow(10);
snapshot.setEntityName(entity.getName());
descriptor.visitProperties(
new PropertyVisitor() {
public boolean visitAttribute(AttributeProperty property) {
ObjAttribute objAttr = property.getAttribute();
// processing compound attributes correctly
snapshot.put(objAttr.getDbAttributePath(), property.readPropertyDirectly(object));
return true;
}
public boolean visitToMany(ToManyProperty property) {
// do nothing
return true;
}
public boolean visitToOne(ToOneProperty property) {
ObjRelationship rel = property.getRelationship();
// if target doesn't propagates its key value, skip it
if (rel.isSourceIndependentFromTargetChange()) {
return true;
}
Object targetObject = property.readPropertyDirectly(object);
if (targetObject == null) {
return true;
}
// if target is Fault, get id attributes from stored snapshot
// to avoid unneeded fault triggering
if (targetObject instanceof Fault) {
DataRow storedSnapshot = getObjectStore().getSnapshot(object.getObjectId());
if (storedSnapshot == null) {
throw new CayenneRuntimeException(
"No matching objects found for ObjectId "
+ object.getObjectId()
+ ". Object may have been deleted externally.");
}
DbRelationship dbRel = rel.getDbRelationships().get(0);
for (DbJoin join : dbRel.getJoins()) {
String key = join.getSourceName();
snapshot.put(key, storedSnapshot.get(key));
}
return true;
}
// target is resolved and we have an FK->PK to it,
// so extract it from target...
Persistent target = (Persistent) targetObject;
Map<String, Object> idParts = target.getObjectId().getIdSnapshot();
// this may happen in uncommitted objects - see the warning in
// the JavaDoc
// of
// this method.
if (idParts.isEmpty()) {
return true;
}
DbRelationship dbRel = rel.getDbRelationships().get(0);
Map<String, Object> fk = dbRel.srcFkSnapshotWithTargetSnapshot(idParts);
snapshot.putAll(fk);
return true;
}
});
// process object id map
// we should ignore any object id values if a corresponding attribute
// is a part of relationship "toMasterPK", since those values have been
// set above when db relationships where processed.
Map<String, Object> thisIdParts = object.getObjectId().getIdSnapshot();
if (thisIdParts != null) {
// put only those that do not exist in the map
for (Map.Entry<String, Object> entry : thisIdParts.entrySet()) {
String nextKey = entry.getKey();
if (!snapshot.containsKey(nextKey)) {
snapshot.put(nextKey, entry.getValue());
}
}
}
return snapshot;
}
@Override
public void prepareForAccess(Persistent object, String property, boolean lazyFaulting) {
if (object.getPersistenceState() == PersistenceState.HOLLOW) {
ObjectId oid = object.getObjectId();
List<?> objects = performQuery(new ObjectIdQuery(oid, false, ObjectIdQuery.CACHE));
if (objects.size() == 0) {
throw new FaultFailureException(
"Error resolving fault, no matching row exists in the database for ObjectId: " + oid);
} else if (objects.size() > 1) {
throw new FaultFailureException(
"Error resolving fault, more than one row exists in the database for ObjectId: " + oid);
}
// 5/28/2013 - Commented out this block to allow for modifying
// objects in the postLoad callback
// sanity check...
// if (object.getPersistenceState() != PersistenceState.COMMITTED) {
//
// String state =
// PersistenceState.persistenceStateName(object.getPersistenceState());
//
// // TODO: andrus 4/13/2006, modified and deleted states are
// // possible due to
// // a race condition, should we handle them here?
// throw new
// FaultFailureException("Error resolving fault for ObjectId: " +
// oid + " and state (" + state
// +
// "). Possible cause - matching row is missing from the database.");
// }
}
// resolve relationship fault
if (lazyFaulting && property != null) {
ClassDescriptor classDescriptor =
getEntityResolver().getClassDescriptor(object.getObjectId().getEntityName());
PropertyDescriptor propertyDescriptor = classDescriptor.getProperty(property);
// If we don't have a property descriptor, there's not much we can
// do.
// Let the caller know that the specified property could not be
// found and list
// all of the properties that could be so the caller knows what can
// be used.
if (propertyDescriptor == null) {
final StringBuilder errorMessage = new StringBuilder();
errorMessage.append(
String.format(
"Property '%s' is not declared for entity '%s'.",
property, object.getObjectId().getEntityName()));
errorMessage.append(" Declared properties are: ");
// Grab each of the declared properties.
final List<String> properties = new ArrayList<String>();
classDescriptor.visitProperties(
new PropertyVisitor() {
@Override
public boolean visitAttribute(final AttributeProperty property) {
properties.add(property.getName());
return true;
}
@Override
public boolean visitToOne(final ToOneProperty property) {
properties.add(property.getName());
return true;
}
@Override
public boolean visitToMany(final ToManyProperty property) {
properties.add(property.getName());
return true;
}
});
// Now add the declared property names to the error message.
boolean first = true;
for (String declaredProperty : properties) {
if (first) {
errorMessage.append(String.format("'%s'", declaredProperty));
first = false;
} else {
errorMessage.append(String.format(", '%s'", declaredProperty));
}
}
errorMessage.append(".");
throw new CayenneRuntimeException(errorMessage.toString());
}
// this should trigger fault resolving
propertyDescriptor.readProperty(object);
}
}
