Examples of PersistentCollection

org.hibernate.collection.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
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

Examples of org.hibernate.collection.spi.PersistentCollection

      // (if the collection is uninitialized, hibernate has no way of
      // knowing if the collection is actually empty without querying the db)
      getPersister().remove( getKey(), getSession() );
    }
    
    final PersistentCollection collection = getCollection();
    if ( collection != null ) {
      getSession().getPersistenceContext().getCollectionEntry( collection ).afterAction( collection );
    }


    evict();

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Examples of org.hibernate.collection.spi.PersistentCollection

  @Override
  public void execute() throws HibernateException {
    final Serializable id = getKey();
    final SessionImplementor session = getSession();
    final CollectionPersister persister = getPersister();
    final PersistentCollection collection = getCollection();
    final boolean affectedByFilters = persister.isAffectedByEnabledFilters( session );


    preUpdate();


    if ( !collection.wasInitialized() ) {
      if ( !collection.hasQueuedOperations() ) {
        throw new AssertionFailure( "no queued adds" );
      }
      //do nothing - we only need to notify the cache... 
    }
    else if ( !affectedByFilters && collection.empty() ) {
      if ( !emptySnapshot ) {
        persister.remove( id, session );
      }
    }
    else if ( collection.needsRecreate( persister ) ) {
      if ( affectedByFilters ) {
        throw new HibernateException(
            "cannot recreate collection while filter is enabled: " +
                MessageHelper.collectionInfoString( persister, collection, id, session )
        );

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Examples of org.hibernate.collection.spi.PersistentCollection


  @Override
  public void execute() throws HibernateException {
    // this method is called when a new non-null collection is persisted
    // or when an existing (non-null) collection is moved to a new owner
    final PersistentCollection collection = getCollection();
    
    preRecreate();
    getPersister().recreate( collection, getKey(), getSession() );
    getSession().getPersistenceContext().getCollectionEntry( collection ).afterAction( collection );
    evict();

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Examples of org.hibernate.collection.spi.PersistentCollection

          //    with the current Session
          //throw new AssertionFailure("bug loading unowned collection");
        }
      }


      PersistentCollection rowCollection = persistenceContext.getLoadContexts()
          .getCollectionLoadContext( rs )
          .getLoadingCollection( persister, collectionRowKey );


      if ( rowCollection != null ) {
        rowCollection.readFrom( rs, persister, descriptor, owner );
      }


    }
    else if ( optionalKey != null ) {
      // we did not find a collection element in the result set, so we

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Examples of org.hibernate.collection.spi.PersistentCollection

   * @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)
    }
  }

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Examples of org.hibernate.collection.spi.PersistentCollection

    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;
          }
        }
      }

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Examples of org.hibernate.collection.spi.PersistentCollection

      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 ) {

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Examples of org.hibernate.collection.spi.PersistentCollection


    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 );
      }

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Examples of org.hibernate.collection.spi.PersistentCollection

    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(),

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Examples of org.hibernate.collection.spi.PersistentCollection

    // 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()

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