server: update lb rule with new protocol (#6476)

* server: update lb rule with new protocol

* Update PR #4746: use StringUtils.isNotBlank() instead

Author: weizhouapache

server/src/main/java/com/cloud/network/lb/LoadBalancingRulesManagerImpl.java

@@ -47,6 +47,7 @@
 import org.apache.cloudstack.framework.config.dao.ConfigurationDao;
 import org.apache.cloudstack.lb.ApplicationLoadBalancerRuleVO;
 import org.apache.cloudstack.lb.dao.ApplicationLoadBalancerRuleDao;
+import org.apache.commons.lang3.StringUtils;
 import org.apache.log4j.Logger;
 
 import com.cloud.agent.api.to.LoadBalancerTO;
@@ -2105,6 +2106,7 @@ public LoadBalancer updateLoadBalancerRule(UpdateLoadBalancerRuleCmd cmd) {
         LoadBalancerVO lbBackup = _lbDao.findById(lbRuleId);
         String customId = cmd.getCustomId();
         Boolean forDisplay = cmd.getDisplay();
+        String lbProtocol = cmd.getLbProtocol();
 
         if (lb == null) {
             throw new InvalidParameterValueException("Unable to find lb rule by id=" + lbRuleId);
@@ -2133,6 +2135,10 @@ public LoadBalancer updateLoadBalancerRule(UpdateLoadBalancerRuleCmd cmd) {
             lb.setDisplay(forDisplay);
         }
 
+        if (StringUtils.isNotBlank(lbProtocol)) {
+            lb.setLbProtocol(lbProtocol);
+        }
+
         // Validate rule in LB provider
         LoadBalancingRule rule = getLoadBalancerRuleToApply(lb);
         if (!validateLbRule(rule)) {