StatsPersistTick singleton enum implementation

application/src/main/java/org/thingsboard/server/actors/shared/ComponentMsgProcessor.java

@@ -78,7 +78,7 @@ public abstract class ComponentMsgProcessor<T extends EntityId> extends Abstract
     }
 
     public void scheduleStatsPersistTick(TbActorCtx context, long statsPersistFrequency) {
-        schedulePeriodicMsgWithDelay(context, new StatsPersistTick(), statsPersistFrequency, statsPersistFrequency);
+        schedulePeriodicMsgWithDelay(context, StatsPersistTick.INSTANCE, statsPersistFrequency, statsPersistFrequency);
     }
 
     protected boolean checkMsgValid(TbMsg tbMsg) {

application/src/main/java/org/thingsboard/server/actors/stats/StatsPersistTick.java

@@ -18,7 +18,9 @@ package org.thingsboard.server.actors.stats;
 import org.thingsboard.server.common.msg.MsgType;
 import org.thingsboard.server.common.msg.TbActorMsg;
 
-public final class StatsPersistTick implements TbActorMsg {
+public enum StatsPersistTick implements TbActorMsg {
+    INSTANCE;
+
     @Override
     public MsgType getMsgType() {
         return MsgType.STATS_PERSIST_TICK_MSG;