/**
* process any unreferenced collections and then inspect all known collections, scheduling
* creates/removes/updates
*/
private void flushCollections(EventSource session) throws HibernateException {
if (LOG.isTraceEnabled()) {
LOG.trace("Processing unreferenced collections");
}
List list = IdentityMap.entries(session.getPersistenceContext().getCollectionEntries());
int size = list.size();
for (int i = 0; i < size; i++) {
Map.Entry me = (Map.Entry) list.get(i);
CollectionEntry ce = (CollectionEntry) me.getValue();
if (!ce.isReached() && !ce.isIgnore()) {
Collections.processUnreachableCollection((PersistentCollection) me.getKey(), session);
}
}
// Schedule updates to collections:
if (LOG.isTraceEnabled()) {
LOG.trace("Scheduling collection removes/(re)creates/updates");
}
list = IdentityMap.entries(session.getPersistenceContext().getCollectionEntries());
size = list.size();
ActionQueue actionQueue = session.getActionQueue();
for (int i = 0; i < size; i++) {
Map.Entry me = (Map.Entry) list.get(i);
PersistentCollection coll = (PersistentCollection) me.getKey();
CollectionEntry ce = (CollectionEntry) me.getValue();
if (ce.isDorecreate()) {
session.getInterceptor().onCollectionRecreate(coll, ce.getCurrentKey());
actionQueue.addAction(
new CollectionRecreateAction(
coll, ce.getCurrentPersister(), ce.getCurrentKey(), session));
}
if (ce.isDoremove()) {
session.getInterceptor().onCollectionRemove(coll, ce.getLoadedKey());
actionQueue.addAction(
new CollectionRemoveAction(
coll,
ce.getLoadedPersister(),
ce.getLoadedKey(),
ce.isSnapshotEmpty(coll),
session));
}
if (ce.isDoupdate()) {
session.getInterceptor().onCollectionUpdate(coll, ce.getLoadedKey());
actionQueue.addAction(
new CollectionUpdateAction(
coll,
ce.getLoadedPersister(),
ce.getLoadedKey(),
ce.isSnapshotEmpty(coll),
session));
}
}
actionQueue.sortCollectionActions();
}
/**
* Initialize the role of the collection.
*
* @param collection The collection to be updated by reachability.
* @param type The type of the collection.
* @param entity The owner of the collection.
* @param session The session from which this request originates
*/
public static void processReachableCollection(
PersistentCollection collection,
CollectionType type,
Object entity,
SessionImplementor session) {
collection.setOwner(entity);
CollectionEntry ce = session.getPersistenceContext().getCollectionEntry(collection);
if (ce == null) {
// refer to comment in StatefulPersistenceContext.addCollection()
throw new HibernateException(
"Found two representations of same collection: " + type.getRole());
}
// The CollectionEntry.isReached() stuff is just to detect any silly users
// who set up circular or shared references between/to collections.
if (ce.isReached()) {
// We've been here before
throw new HibernateException("Found shared references to a collection: " + type.getRole());
}
ce.setReached(true);
SessionFactoryImplementor factory = session.getFactory();
CollectionPersister persister = factory.getCollectionPersister(type.getRole());
ce.setCurrentPersister(persister);
ce.setCurrentKey(
type.getKeyOfOwner(entity, session)); // TODO: better to pass the id in as an argument?
if (LOG.isDebugEnabled()) {
if (collection.wasInitialized())
LOG.debugf(
"Collection found: %s, was: %s (initialized)",
MessageHelper.collectionInfoString(persister, ce.getCurrentKey(), factory),
MessageHelper.collectionInfoString(
ce.getLoadedPersister(), ce.getLoadedKey(), factory));
else
LOG.debugf(
"Collection found: %s, was: %s (uninitialized)",
MessageHelper.collectionInfoString(persister, ce.getCurrentKey(), factory),
MessageHelper.collectionInfoString(
ce.getLoadedPersister(), ce.getLoadedKey(), factory));
}
prepareCollectionForUpdate(collection, ce, factory);
}
/**
* 1. record the collection role that this collection is referenced by 2. decide if the collection
* needs deleting/creating/updating (but don't actually schedule the action yet)
*/
@SuppressWarnings({"JavaDoc"})
private static void prepareCollectionForUpdate(
PersistentCollection collection, CollectionEntry entry, SessionFactoryImplementor factory) {
if (entry.isProcessed()) {
throw new AssertionFailure("collection was processed twice by flush()");
}
entry.setProcessed(true);
final CollectionPersister loadedPersister = entry.getLoadedPersister();
final CollectionPersister currentPersister = entry.getCurrentPersister();
if (loadedPersister != null
|| currentPersister != null) { // it is or was referenced _somewhere_
boolean ownerChanged =
loadedPersister != currentPersister
|| // if either its role changed,
!currentPersister
.getKeyType()
.isEqual( // or its key changed
entry.getLoadedKey(), entry.getCurrentKey(), factory);
if (ownerChanged) {
// do a check
final boolean orphanDeleteAndRoleChanged =
loadedPersister != null
&& currentPersister != null
&& loadedPersister.hasOrphanDelete();
if (orphanDeleteAndRoleChanged) {
throw new HibernateException(
"Don't change the reference to a collection with cascade=\"all-delete-orphan\": "
+ loadedPersister.getRole());
}
// do the work
if (currentPersister != null) {
entry.setDorecreate(true); // we will need to create new entries
}
if (loadedPersister != null) {
entry.setDoremove(true); // we will need to remove ye olde entries
if (entry.isDorecreate()) {
LOG.trace("Forcing collection initialization");
collection.forceInitialization();
}
}
} else if (collection.isDirty()) {
// the collection's elements have changed
entry.setDoupdate(true);
}
}
}
/**
* process any unreferenced collections and then inspect all known collections, scheduling
* creates/removes/updates
*/
@SuppressWarnings("unchecked")
private int flushCollections(
final EventSource session, final PersistenceContext persistenceContext)
throws HibernateException {
LOG.trace("Processing unreferenced collections");
final Map.Entry<PersistentCollection, CollectionEntry>[] entries =
IdentityMap.concurrentEntries(
(Map<PersistentCollection, CollectionEntry>) persistenceContext.getCollectionEntries());
final int count = entries.length;
for (Map.Entry<PersistentCollection, CollectionEntry> me : entries) {
CollectionEntry ce = me.getValue();
if (!ce.isReached() && !ce.isIgnore()) {
Collections.processUnreachableCollection(me.getKey(), session);
}
}
// Schedule updates to collections:
LOG.trace("Scheduling collection removes/(re)creates/updates");
ActionQueue actionQueue = session.getActionQueue();
for (Map.Entry<PersistentCollection, CollectionEntry> me :
IdentityMap.concurrentEntries(
(Map<PersistentCollection, CollectionEntry>)
persistenceContext.getCollectionEntries())) {
PersistentCollection coll = me.getKey();
CollectionEntry ce = me.getValue();
if (ce.isDorecreate()) {
session.getInterceptor().onCollectionRecreate(coll, ce.getCurrentKey());
actionQueue.addAction(
new CollectionRecreateAction(
coll, ce.getCurrentPersister(), ce.getCurrentKey(), session));
}
if (ce.isDoremove()) {
session.getInterceptor().onCollectionRemove(coll, ce.getLoadedKey());
actionQueue.addAction(
new CollectionRemoveAction(
coll,
ce.getLoadedPersister(),
ce.getLoadedKey(),
ce.isSnapshotEmpty(coll),
session));
}
if (ce.isDoupdate()) {
session.getInterceptor().onCollectionUpdate(coll, ce.getLoadedKey());
actionQueue.addAction(
new CollectionUpdateAction(
coll,
ce.getLoadedPersister(),
ce.getLoadedKey(),
ce.isSnapshotEmpty(coll),
session));
}
// todo : I'm not sure the !wasInitialized part should really be part of this check
if (!coll.wasInitialized() && coll.hasQueuedOperations()) {
actionQueue.addAction(
new QueuedOperationCollectionAction(
coll, ce.getLoadedPersister(), ce.getLoadedKey(), session));
}
}
actionQueue.sortCollectionActions();
return count;
}