+import javax.annotation.concurrent.GuardedBy;
+
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataBroker.DataChangeScope;
+import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
+import org.opendaylight.controller.md.sal.dom.store.impl.DataChangeListenerRegistration;
+import org.opendaylight.yangtools.concepts.AbstractListenerRegistration;
+import org.opendaylight.yangtools.concepts.Identifiable;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.StoreTreeNode;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+