add log conditional

bubble-server/src/main/java/bubble/rule/AppRuleDriver.java

@@ -82,7 +82,7 @@ public interface AppRuleDriver {
         redis.rename(tempList, ipList);
         redis.sadd_plaintext(listOfListsForIp, ipList);
         final Long count = redis.sunionstore(unionSetName, redis.smembers(listOfListsForIp));
-        log.debug("defineRedisSet("+ip+","+listOfListsName+","+listName+"): unionSetName="+unionSetName+" size="+count);
+        if (log.isDebugEnabled()) log.debug("defineRedisSet("+ip+","+listOfListsName+","+listName+"): unionSetName="+unionSetName+" size="+count);
     }
 
     static boolean isFlexRouteFqdn(RedisService redis, String ip, String[] fqdns) {