Examples of org.hibernate.collection.spi.PersistentCollection

org.hibernate.collection.spi.PersistentCollection
Persistent collections are treated as value objects by Hibernate. ie. they have no independent existence beyond the object holding a reference to them. Unlike instances of entity classes, they are automatically deleted when unreferenced and automatically become persistent when held by a persistent object. Collections can be passed between different objects (change "roles") and this might cause their elements to move from one database table to another.

Hibernate "wraps" a java collection in an instance of PersistentCollection. This mechanism is designed to support tracking of changes to the collection's persistent state and lazy instantiation of collection elements. The downside is that only certain abstract collection types are supported and any extra semantics are lost

Applications should never use classes in this package directly, unless extending the "framework" here.

Changes to structure of the collection are recorded by the collection calling back to the session. Changes to mutable elements (ie. composite elements) are discovered by cloning their state when the collection is initialized and comparing at flush time. @author Gavin King

   * @param key The key of the collection's entry.
   */
  private void addCollection(PersistentCollection coll, CollectionEntry entry, Serializable key) {
    collectionEntries.put( coll, entry );
    final CollectionKey collectionKey = new CollectionKey( entry.getLoadedPersister(), key );
    final PersistentCollection old = collectionsByKey.put( collectionKey, coll );
    if ( old != null ) {
      if ( old == coll ) {
        throw new AssertionFailure( "bug adding collection twice" );
      }
      // or should it actually throw an exception?
      old.unsetSession( session );
      collectionEntries.remove( old );
      // watch out for a case where old is still referenced
      // somewhere in the object graph! (which is a user error)
    }
  }

View Full Code Here

    return getCollectionEntry( coll ).getSnapshot();
  }


  @Override
  public CollectionEntry getCollectionEntryOrNull(Object collection) {
    PersistentCollection coll;
    if ( collection instanceof PersistentCollection ) {
      coll = (PersistentCollection) collection;
      //if (collection==null) throw new TransientObjectException("Collection was not yet persistent");
    }
    else {
      coll = getCollectionHolder( collection );
      if ( coll == null ) {
        //it might be an unwrapped collection reference!
        //try to find a wrapper (slowish)
        final Iterator<PersistentCollection> wrappers = collectionEntries.keyIterator();
        while ( wrappers.hasNext() ) {
          final PersistentCollection pc = wrappers.next();
          if ( pc.isWrapper( collection ) ) {
            coll = pc;
            break;
          }
        }
      }

View Full Code Here

      if ( tracing ) {
        LOG.trace( "Starting deserialization of [" + count + "] collectionEntries entries" );
      }
      rtn.collectionEntries = IdentityMap.instantiateSequenced( count < INIT_COLL_SIZE ? INIT_COLL_SIZE : count );
      for ( int i = 0; i < count; i++ ) {
        final PersistentCollection pc = (PersistentCollection) ois.readObject();
        final CollectionEntry ce = CollectionEntry.deserialize( ois, session );
        pc.setCurrentSession( session );
        rtn.collectionEntries.put( pc, ce );
      }


      count = ois.readInt();
      if ( tracing ) {

View Full Code Here


    if ( isUpdate ) {
      removeCollection( persister, extractCollectionKeyFromOwner( persister ), session );
    }
    if ( collection != null && collection instanceof PersistentCollection ) {
      final PersistentCollection wrapper = (PersistentCollection) collection;
      wrapper.setCurrentSession( session );
      if ( wrapper.wasInitialized() ) {
        session.getPersistenceContext().addNewCollection( persister, wrapper );
      }
      else {
        reattachCollection( wrapper, type );
      }

View Full Code Here

    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
              )
          );
      }
      if ( !coll.wasInitialized() && coll.hasQueuedOperations() ) {
        actionQueue.addAction(
            new QueuedOperationCollectionAction(
                coll,
                ce.getLoadedPersister(),
                ce.getLoadedKey(),

View Full Code Here

    // the batch fetching queues should also be cleared - especially the collection batch fetching one
    persistenceContext.getBatchFetchQueue().clear();


    for ( Map.Entry<PersistentCollection, CollectionEntry> me : IdentityMap.concurrentEntries( persistenceContext.getCollectionEntries() ) ) {
      CollectionEntry collectionEntry = me.getValue();
      PersistentCollection persistentCollection = me.getKey();
      collectionEntry.postFlush(persistentCollection);
      if ( collectionEntry.getLoadedPersister() == null ) {
        //if the collection is dereferenced, remove from the session cache
        //iter.remove(); //does not work, since the entrySet is not backed by the set
        persistenceContext.getCollectionEntries()

View Full Code Here

    }
    else {
      return; //EARLY EXIT!
    }


    PersistentCollection collection = (PersistentCollection) pc;
    if ( collection.unsetSession( getSession() ) ) evictCollection(collection);
  }

View Full Code Here

      throws HibernateException {


    if ( collection != null && ( collection instanceof PersistentCollection ) ) {


      final SessionImplementor session = getSession();
      PersistentCollection coll = (PersistentCollection) collection;
      if ( coll.setCurrentSession( session ) ) {
        reattachCollection( coll, collectionType );
      }
      return null;


    }

View Full Code Here


        if ( collection == CollectionType.UNFETCHED_COLLECTION ) {
          return null;
        }


        PersistentCollection ah = persistenceContext.getCollectionHolder( collection );
        if ( ah == null ) {
          ah = collectionType.wrap( session, collection );
          persistenceContext.addNewCollection( persister, ah );
          persistenceContext.addCollectionHolder( ah );
        }
        return null;
      }
      else {


        PersistentCollection persistentCollection = collectionType.wrap( session, collection );
        persistenceContext.addNewCollection( persister, persistentCollection );


        if ( LOG.isTraceEnabled() ) {
          LOG.tracev( "Wrapped collection in role: {0}", collectionType.getRole() );
        }

View Full Code Here


  /**
   * called by a collection that wants to initialize itself
   */
  public void onInitializeCollection(InitializeCollectionEvent event) throws HibernateException {
    PersistentCollection collection = event.getCollection();
    SessionImplementor source = event.getSession();


    CollectionEntry ce = source.getPersistenceContext().getCollectionEntry( collection );
    if ( ce == null ) {
      throw new HibernateException( "collection was evicted" );
    }
    if ( !collection.wasInitialized() ) {
      final boolean traceEnabled = LOG.isTraceEnabled();
      if ( traceEnabled ) {
        LOG.tracev(
            "Initializing collection {0}",
            MessageHelper.collectionInfoString(

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of org.hibernate.collection.spi.PersistentCollection

com.fasterxml.jackson.datatype.hibernate4.PersistentCollectionSerializer

org.hibernate.action.internal.CollectionRecreateAction

org.hibernate.action.internal.CollectionRemoveAction

org.hibernate.action.internal.CollectionUpdateAction

org.hibernate.action.internal.QueuedOperationCollectionAction

org.hibernate.engine.internal.StatefulPersistenceContext

org.hibernate.engine.loading.internal.CollectionLoadContext

org.hibernate.engine.spi.BatchFetchQueue

org.hibernate.event.internal.AbstractFlushingEventListener

org.hibernate.event.internal.DefaultInitializeCollectionEventListener

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.