instanceDataChildrenByName = ControllerContext.findInstanceDataChildrenByName(listStreamSchemaNode, "events");
final DataSchemaNode eventsSchemaNode = Iterables.getFirst(instanceDataChildrenByName, null);
Preconditions.checkState(eventsSchemaNode instanceof LeafSchemaNode);
instanceDataChildrenByName = ControllerContext.findInstanceDataChildrenByName(listStreamSchemaNode, "events");
final DataSchemaNode eventsSchemaNode = Iterables.getFirst(instanceDataChildrenByName, null);
Preconditions.checkState(eventsSchemaNode instanceof LeafSchemaNode);