[sonar] fix sonar plm

foudations/mogo-commons/src/main/java/com/mogo/commons/module/status/MogoStatusManager.java

@@ -16,22 +16,15 @@ import java.util.concurrent.ConcurrentHashMap;
  */
 public class MogoStatusManager implements IMogoStatusManager {
 
-    private static volatile MogoStatusManager sInstance;
-    private static final byte[] obj = new byte[0];
-
     private MogoStatusManager() {
-
     }
 
     public static MogoStatusManager getInstance() {
-        if (sInstance == null) {
-            synchronized (obj) {
-                if (sInstance == null) {
-                    sInstance = new MogoStatusManager();
-                }
-            }
-        }
-        return sInstance;
+        return Holder.sInstance;
+    }
+
+    private static final class Holder{
+        private static final MogoStatusManager sInstance = new MogoStatusManager();
     }
 
     /**