fixing bug 723 by queuing Operations until initial load has completed

java/com.sap.sailing.server/src/com/sap/sailing/server/operationaltransformation/CreateFlexibleLeaderboard.java

@@ -1,10 +1,13 @@
 package com.sap.sailing.server.operationaltransformation;
 
+import java.util.logging.Logger;
+
 import com.sap.sailing.domain.leaderboard.FlexibleLeaderboard;
 import com.sap.sailing.server.RacingEventService;
 import com.sap.sailing.server.RacingEventServiceOperation;
 
 public class CreateFlexibleLeaderboard extends AbstractLeaderboardOperation<FlexibleLeaderboard> {
+    private static final Logger logger = Logger.getLogger(CreateFlexibleLeaderboard.class.getName());
     private static final long serialVersionUID = 891352705068098580L;
     private final int[] discardThresholds;
 
@@ -15,7 +18,13 @@ public class CreateFlexibleLeaderboard extends AbstractLeaderboardOperation<Flex
 
     @Override
     public FlexibleLeaderboard internalApplyTo(RacingEventService toState) {
-        return toState.addFlexibleLeaderboard(getLeaderboardName(), discardThresholds);
+        FlexibleLeaderboard result = null;
+        if (toState.getLeaderboardByName(getLeaderboardName()) == null) {
+            result = toState.addFlexibleLeaderboard(getLeaderboardName(), discardThresholds);
+        } else {
+            logger.warning("Cannot replicate creation of flexible leaderboard "+getLeaderboardName()+" because it already exists in the replica");
+        }
+        return result;
     }
 
     @Override