DaanHoogland commented on a change in pull request #3997:
URL: https://github.com/apache/cloudstack/pull/3997#discussion_r517174628



##########
File path: 
server/src/main/java/com/cloud/configuration/ConfigurationManagerImpl.java
##########
@@ -4075,6 +4079,151 @@ public VlanVO doInTransaction(final TransactionStatus 
status) {
 
     }
 
+    @Override
+    public Vlan updateVlanAndPublicIpRange(UpdateVlanIpRangeCmd cmd) throws 
ConcurrentOperationException,
+            ResourceUnavailableException,ResourceAllocationException {
+
+        return  updateVlanAndPublicIpRange(cmd.getId(), 
cmd.getStartIp(),cmd.getEndIp(),
+                cmd.getGateway(),cmd.getNetmask());
+    }
+
+    @DB
+    @ActionEvent(eventType = EventTypes.EVENT_VLAN_IP_RANGE_UPDATE, 
eventDescription = "update vlan ip Range", async
+            = false)
+    public Vlan updateVlanAndPublicIpRange(final long id, String startIp,
+                                           String endIp,
+                                           String gateway,
+                                           String netmask) throws 
ConcurrentOperationException {
+
+        VlanVO vlanRange = _vlanDao.findById(id);
+        if (vlanRange == null) {
+            throw new InvalidParameterValueException("Please specify a valid 
IP range id.");
+        }
+
+        if (gateway == null) {
+            gateway = vlanRange.getVlanGateway();
+        }
+
+        if (netmask == null) {
+            netmask = vlanRange.getVlanNetmask();
+        }
+
+        final String[] existingVlanIPRangeArray = 
vlanRange.getIpRange().split("-");
+        final String currentStartIP = existingVlanIPRangeArray[0];
+        final String currentEndIP = existingVlanIPRangeArray [1];
+
+        if(startIp == null) {
+            startIp = currentStartIP;
+        }
+
+        if(endIp == null) {
+            endIp = currentEndIP;
+        }
+
+        final List<IPAddressVO> ips = _publicIpAddressDao.listByVlanId(id);
+        checkAllocatedIpsAreWithinVlanRange(ips,startIp,endIp);
+
+        final String cidr = NetUtils.ipAndNetMaskToCidr(gateway, netmask);
+        final String cidrAddress = getCidrAddress(cidr);
+        final long cidrSize = getCidrSize(cidr);
+
+        checkIpRange(currentStartIP,currentEndIP,cidrAddress,cidrSize);
+
+        checkIpRange(startIp, endIp, cidrAddress, cidrSize);
+
+        checkGatewayOverlap(startIp,endIp,gateway);
+
+        VlanVO range;
+        try {
+            final String newStartIP = startIp;
+            final String newEndIP = endIp;
+
+            range = _vlanDao.acquireInLockTable(id, 30);
+            if (range == null) {
+                throw new CloudRuntimeException("Unable to acquire vlan 
configuration: " + id);
+            }
+
+            if (s_logger.isDebugEnabled()) {
+                s_logger.debug("lock vlan " + id + " is acquired");
+            }
+
+            commitUpdateVlanAndIpRange(id, newStartIP, newEndIP, 
currentStartIP, currentEndIP,true);
+
+        } catch (final Exception e) {
+            s_logger.error("Unable to edit VlanRange due to " + 
e.getMessage(), e);
+            throw new CloudRuntimeException("Failed to edit VlanRange. Please 
contact Cloud Support.");
+        } finally {
+            _vlanDao.releaseFromLockTable(id);
+        }
+
+        return vlanRange;
+    }
+    private VlanVO commitUpdateVlanAndIpRange(final Long id, final String 
newStartIP, final String newEndIP,final String currentStartIP, final String 
currentEndIP, final boolean ipv4) {

Review comment:
       ```suggestion
       }
   
       private VlanVO commitUpdateVlanAndIpRange(final Long id, final String 
newStartIP, final String newEndIP,final String currentStartIP, final String 
currentEndIP, final boolean ipv4) {
   ```




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