Examples of org.hibernate.engine.spi.EntityKey

org.hibernate.engine.spi.EntityKey
Uniquely identifies of an entity instance in a particular Session by identifier. Note that it's only safe to be used within the scope of a Session: it doesn't consider for example the tenantId as part of the equality definition.
Information used to determine uniqueness consists of the entity-name and the identifier value (see {@link #equals}).
Performance considerations: lots of instances of this type are created at runtime. Make sure each one is as small as possible by storing just the essential needed. @author Gavin King @author Sanne Grinovero

    if ( isImpliedOptimisticLocking ) {
      // need to treat this as if it where optimistic-lock="all" (dirty does *not* make sense);
      // first we need to locate the "loaded" state
      //
      // Note, it potentially could be a proxy, so doAfterTransactionCompletion the location the safe way...
      final EntityKey key = session.generateEntityKey( id, this );
      Object entity = session.getPersistenceContext().getEntity( key );
      if ( entity != null ) {
        EntityEntry entry = session.getPersistenceContext().getEntry( entity );
        loadedState = entry.getLoadedState();
      }

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        try {
          //if there is no resulting row, return null
          if ( !rs.next() ) {
            return null;
          }
          final EntityKey key = session.generateEntityKey( id, this );
          Object owner = session.getPersistenceContext().getEntity( key );
          for ( int i = 0; i < naturalIdPropertyCount; i++ ) {
            snapshot[i] = extractionTypes[i].hydrate( rs, getPropertyAliases( "", naturalIdPropertyIndexes[i] ), session, null );
            if (extractionTypes[i].isEntityType()) {
              snapshot[i] = extractionTypes[i].resolve(snapshot[i], session, owner);

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      persister = source.getEntityPersister(event.getEntityName(), object); //refresh() does not pass an entityName
      id = persister.getIdentifier( object, event.getSession() );
      if ( LOG.isTraceEnabled() ) {
        LOG.tracev( "Refreshing transient {0}", MessageHelper.infoString( persister, id, source.getFactory() ) );
      }
      final EntityKey key = source.generateEntityKey( id, persister );
      if ( source.getPersistenceContext().getEntry(key) != null ) {
        throw new PersistentObjectException(
            "attempted to refresh transient instance when persistent instance was already associated with the Session: " +
            MessageHelper.infoString(persister, id, source.getFactory() )
          );
      }
    }
    else {
      if ( LOG.isTraceEnabled() ) {
        LOG.tracev( "Refreshing ", MessageHelper.infoString( e.getPersister(), e.getId(), source.getFactory() ) );
      }
      if ( !e.isExistsInDatabase() ) {
        throw new HibernateException( "this instance does not yet exist as a row in the database" );
      }


      persister = e.getPersister();
      id = e.getId();
    }


    // cascade the refresh prior to refreshing this entity
    refreshedAlready.put(object, object);
    new Cascade( CascadingAction.REFRESH, Cascade.BEFORE_REFRESH, source)
        .cascade( persister, object, refreshedAlready );


    if ( e != null ) {
      final EntityKey key = source.generateEntityKey( id, persister );
      source.getPersistenceContext().removeEntity(key);
      if ( persister.hasCollections() ) new EvictVisitor( source ).process(object, persister);
    }


    if ( persister.hasCache() ) {

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            throw new AssertionError(
                "Deprecated version of getIdentifier (no session) was used but session was required"
            );
          }
          final String associatedEntityName = ( (EntityType) virtualPropertyType ).getAssociatedEntityName();
          final EntityKey entityKey = session.generateEntityKey(
              (Serializable) extractedValues[i],
              session.getFactory().getEntityPersister( associatedEntityName )
          );
          // it is conceivable there is a proxy, so check that first
          Object association = session.getPersistenceContext().getProxy( entityKey );

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  }


  private Object getReplacement() {
    final SessionImplementor session = getSession();
    if ( isUninitialized() && session != null && session.isOpen()) {
      final EntityKey key = session.generateEntityKey(
          getIdentifier(),
          session.getFactory().getEntityPersister( getEntityName() )
      );
      final Object entity = session.getPersistenceContext().getEntity(key);
      if (entity!=null) setImplementation( entity );

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        throw new StaleObjectStateException( persister.getEntityName(), id );
      }
      return snapshot;
    }
    // TODO: optimize away this lookup for entities w/o unsaved-value="undefined"
    final EntityKey entityKey = session.generateEntityKey( id, persister );
    return session.getPersistenceContext().getCachedDatabaseSnapshot( entityKey );
  }

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        EntityEntry entry = source.getPersistenceContext().getEntry( entity );
        if ( entry == null ) {
          EntityPersister persister = source.getEntityPersister( event.getEntityName(), entity );
          Serializable id = persister.getIdentifier( entity, source );
          if ( id != null ) {
            final EntityKey key = source.generateEntityKey( id, persister );
            final Object managedEntity = source.getPersistenceContext().getEntity( key );
            entry = source.getPersistenceContext().getEntry( managedEntity );
            if ( entry != null ) {
              // we have specialized case of a detached entity from the
              // perspective of the merge operation.  Specifically, we

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  private boolean existsInDatabase(Object entity, EventSource source, EntityPersister persister) {
    EntityEntry entry = source.getPersistenceContext().getEntry( entity );
    if ( entry == null ) {
      Serializable id = persister.getIdentifier( entity, source );
      if ( id != null ) {
        final EntityKey key = source.generateEntityKey( id, persister );
        final Object managedEntity = source.getPersistenceContext().getEntity( key );
        entry = source.getPersistenceContext().getEntry( managedEntity );
      }
    }

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    if ( LOG.isTraceEnabled() ) {
      LOG.tracev( "Saving {0}", MessageHelper.infoString( persister, id, source.getFactory() ) );
    }


    final EntityKey key;
    if ( !useIdentityColumn ) {
      key = source.generateEntityKey( id, persister );
      Object old = source.getPersistenceContext().getEntity( key );
      if ( old != null ) {
        if ( source.getPersistenceContext().getEntry( old ).getStatus() == Status.DELETED ) {

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      throw new TypeMismatchException(
          "Provided id of the wrong type for class " + persister.getEntityName() + ". Expected: " + idClass + ", got " + event.getEntityId().getClass()
      );
    }


    final  EntityKey keyToLoad = source.generateEntityKey( event.getEntityId(), persister );


    try {
      if ( loadType.isNakedEntityReturned() ) {
        //do not return a proxy!
        //(this option indicates we are initializing a proxy)

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Related Classes of org.hibernate.engine.spi.EntityKey

org.hibernate.AssertionFailure

org.hibernate.engine.internal.Collections

org.hibernate.engine.internal.StatefulPersistenceContext

org.hibernate.event.internal.AbstractReassociateEventListener

org.hibernate.event.internal.AbstractSaveEventListener

org.hibernate.event.internal.DefaultDeleteEventListener

org.hibernate.event.internal.DefaultEvictEventListener

org.hibernate.event.internal.DefaultFlushEntityEventListener

org.hibernate.event.internal.DefaultLoadEventListener

org.hibernate.event.internal.DefaultMergeEventListener

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