-import java.util.ArrayList;
-import java.util.concurrent.locks.ReentrantLock;
-import java.util.concurrent.locks.Lock;
-import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.CopyOnWriteArrayList
+import java.util.concurrent.locks.Lock
+import java.util.concurrent.locks.ReentrantLock
+import org.opendaylight.controller.md.sal.binding.util.TypeSafeDataReader