protected void fireDataChannelChanged(Object postedBy, GraphDiff changes) {
EventManager manager = getEventManager();
if (manager != null) {
GraphEvent e = new GraphEvent(this, postedBy, changes);
manager.postEvent(e, DataChannel.GRAPH_CHANGED_SUBJECT);
}
}
public void invalidateObjects(Collection objects) {
performGenericQuery(new RefreshQuery(objects));