Datastore-constrained txes: elanmanager
[netvirt.git] / elanmanager / impl / src / main / java / org / opendaylight / netvirt / elan / utils / ElanUtils.java
index 3c1f3d579253b8498aa19b1d923ca730baf17549..4f9312209c525da8489570e532b5604fcf18b085 100755 (executable)
@@ -7,6 +7,9 @@
  */
 package org.opendaylight.netvirt.elan.utils;
 
+import static org.opendaylight.controller.md.sal.binding.api.WriteTransaction.CREATE_MISSING_PARENTS;
+import static org.opendaylight.genius.infra.Datastore.CONFIGURATION;
+
 import com.google.common.base.Optional;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Strings;
@@ -17,6 +20,7 @@ import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.common.util.concurrent.MoreExecutors;
+
 import java.math.BigInteger;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -24,10 +28,13 @@ import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
+
+import javax.annotation.CheckReturnValue;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
 import javax.inject.Inject;
 import javax.inject.Singleton;
+
 import org.apache.commons.lang3.StringUtils;
 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
@@ -35,9 +42,17 @@ import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
 import org.opendaylight.controller.md.sal.common.api.data.TransactionCommitFailedException;
+import org.opendaylight.genius.infra.Datastore.Configuration;
+import org.opendaylight.genius.infra.Datastore.Operational;
+import org.opendaylight.genius.infra.ManagedNewTransactionRunner;
+import org.opendaylight.genius.infra.ManagedNewTransactionRunnerImpl;
+import org.opendaylight.genius.infra.TypedReadTransaction;
+import org.opendaylight.genius.infra.TypedReadWriteTransaction;
+import org.opendaylight.genius.infra.TypedWriteTransaction;
 import org.opendaylight.genius.interfacemanager.globals.InterfaceInfo;
 import org.opendaylight.genius.interfacemanager.globals.InterfaceServiceUtil;
 import org.opendaylight.genius.interfacemanager.interfaces.IInterfaceManager;
+import org.opendaylight.genius.itm.api.IITMProvider;
 import org.opendaylight.genius.itm.globals.ITMConstants;
 import org.opendaylight.genius.mdsalutil.ActionInfo;
 import org.opendaylight.genius.mdsalutil.FlowEntity;
@@ -60,7 +75,7 @@ import org.opendaylight.genius.mdsalutil.packet.ARP;
 import org.opendaylight.genius.mdsalutil.packet.Ethernet;
 import org.opendaylight.genius.mdsalutil.packet.IPv4;
 import org.opendaylight.infrautils.utils.concurrent.JdkFutures;
-import org.opendaylight.netvirt.elan.ElanException;
+import org.opendaylight.infrautils.utils.concurrent.ListenableFutures;
 import org.opendaylight.netvirt.elan.arp.responder.ArpResponderUtil;
 import org.opendaylight.netvirt.elan.cache.ElanInterfaceCache;
 import org.opendaylight.netvirt.elanmanager.api.ElanHelper;
@@ -113,6 +128,10 @@ import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.ext
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.ItmRpcService;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.RemoveTerminatingServiceActionsInput;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.RemoveTerminatingServiceActionsInputBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.RemoveTerminatingServiceActionsOutput;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupId;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.groups.Group;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.groups.GroupKey;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.Nodes;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
@@ -161,6 +180,8 @@ import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.tag.name.map.ElanTagNameKey;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.forwarding.entries.MacEntry;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.forwarding.entries.MacEntryKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.Subnetmaps;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.rev150602.subnetmaps.Subnetmap;
 import org.opendaylight.yangtools.yang.binding.DataObject;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.InstanceIdentifierBuilder;
@@ -174,6 +195,7 @@ public class ElanUtils {
     private static final Logger LOG = LoggerFactory.getLogger(ElanUtils.class);
 
     private final DataBroker broker;
+    private final ManagedNewTransactionRunner txRunner;
     private final IMdsalApiManager mdsalManager;
     private final OdlInterfaceRpcService interfaceManagerRpcService;
     private final ItmRpcService itmRpcService;
@@ -182,6 +204,7 @@ public class ElanUtils {
     private final ElanItmUtils elanItmUtils;
     private final ElanEtreeUtils elanEtreeUtils;
     private final ElanInterfaceCache elanInterfaceCache;
+    private final IITMProvider iitmProvider;
 
     public static final FutureCallback<Void> DEFAULT_CALLBACK = new FutureCallback<Void>() {
         @Override
@@ -199,8 +222,9 @@ public class ElanUtils {
     public ElanUtils(DataBroker dataBroker, IMdsalApiManager mdsalManager,
             OdlInterfaceRpcService interfaceManagerRpcService, ItmRpcService itmRpcService, ElanConfig elanConfig,
             IInterfaceManager interfaceManager, ElanEtreeUtils elanEtreeUtils, ElanItmUtils elanItmUtils,
-            ElanInterfaceCache elanInterfaceCache) {
+            ElanInterfaceCache elanInterfaceCache, IITMProvider iitmProvider) {
         this.broker = dataBroker;
+        this.txRunner = new ManagedNewTransactionRunnerImpl(dataBroker);
         this.mdsalManager = mdsalManager;
         this.interfaceManagerRpcService = interfaceManagerRpcService;
         this.itmRpcService = itmRpcService;
@@ -209,6 +233,7 @@ public class ElanUtils {
         this.elanEtreeUtils = elanEtreeUtils;
         this.elanItmUtils = elanItmUtils;
         this.elanInterfaceCache = elanInterfaceCache;
+        this.iitmProvider = iitmProvider;
     }
 
     public final Boolean isOpenstackVniSemanticsEnforced() {
@@ -279,6 +304,7 @@ public class ElanUtils {
         }
     }
 
+    @SuppressWarnings("checkstyle:ForbidCertainMethod")
     public static <T extends DataObject> void delete(DataBroker broker, LogicalDatastoreType datastoreType,
             InstanceIdentifier<T> path) {
         WriteTransaction tx = broker.newWriteOnlyTransaction();
@@ -286,6 +312,7 @@ public class ElanUtils {
         Futures.addCallback(tx.submit(), DEFAULT_CALLBACK, MoreExecutors.directExecutor());
     }
 
+    @SuppressWarnings("checkstyle:ForbidCertainMethod")
     public static <T extends DataObject> void delete(DataBroker broker, LogicalDatastoreType datastoreType,
             InstanceIdentifier<T> path, FutureCallback<Void> callback) {
         WriteTransaction tx = broker.newWriteOnlyTransaction();
@@ -308,6 +335,12 @@ public class ElanUtils {
         return MDSALUtil.read(broker, LogicalDatastoreType.OPERATIONAL, elanIdentifier).orNull();
     }
 
+    @Nullable
+    public static Elan getElanByName(TypedReadTransaction<Operational> tx, String elanInstanceName)
+            throws ExecutionException, InterruptedException {
+        return tx.read(getElanInstanceOperationalDataPath(elanInstanceName)).get().orNull();
+    }
+
     public static InstanceIdentifier<Elan> getElanInstanceOperationalDataPath(String elanInstanceName) {
         return InstanceIdentifier.builder(ElanState.class).child(Elan.class, new ElanKey(elanInstanceName)).build();
     }
@@ -325,6 +358,11 @@ public class ElanUtils {
         return existingInterfaceMacEntry.orNull();
     }
 
+    public MacEntry getInterfaceMacEntriesOperationalDataPathFromId(TypedReadTransaction<Operational> tx,
+            InstanceIdentifier<MacEntry> identifier) throws ExecutionException, InterruptedException {
+        return tx.read(identifier).get().orNull();
+    }
+
     public static InstanceIdentifier<MacEntry> getInterfaceMacEntriesIdentifierOperationalDataPath(String interfaceName,
             PhysAddress physAddress) {
         return InstanceIdentifier.builder(ElanInterfaceForwardingEntries.class)
@@ -339,12 +377,23 @@ public class ElanUtils {
         return read(broker, LogicalDatastoreType.OPERATIONAL, macId);
     }
 
+    public Optional<MacEntry> getMacEntryForElanInstance(TypedReadTransaction<Operational> tx, String elanName,
+            PhysAddress physAddress) throws ExecutionException, InterruptedException {
+        InstanceIdentifier<MacEntry> macId = getMacEntryOperationalDataPath(elanName, physAddress);
+        return tx.read(macId).get();
+    }
+
     public MacEntry getMacEntryFromElanMacId(InstanceIdentifier identifier) {
         Optional<MacEntry> existingInterfaceMacEntry = read(broker,
                 LogicalDatastoreType.OPERATIONAL, identifier);
         return existingInterfaceMacEntry.orNull();
     }
 
+    public MacEntry getMacEntryFromElanMacId(TypedReadTransaction<Operational> tx,
+            InstanceIdentifier<MacEntry> identifier) throws ExecutionException, InterruptedException {
+        return tx.read(identifier).get().orNull();
+    }
+
     public static InstanceIdentifier<MacEntry> getMacEntryOperationalDataPath(String elanName,
             PhysAddress physAddress) {
         return InstanceIdentifier.builder(ElanForwardingTables.class).child(MacTable.class, new MacTableKey(elanName))
@@ -582,11 +631,10 @@ public class ElanUtils {
      *            true if remote dmac flows should be configured as well
      * @param writeFlowGroupTx
      *            the flow group tx
-     * @throws ElanException in case of issues creating the flow objects
      */
     public void setupMacFlows(ElanInstance elanInfo, InterfaceInfo interfaceInfo,
                               long macTimeout, String macAddress, boolean configureRemoteFlows,
-                              WriteTransaction writeFlowGroupTx) throws ElanException {
+                              TypedWriteTransaction<Configuration> writeFlowGroupTx) {
         synchronized (getElanMacDPNKey(elanInfo.getElanTag(), macAddress, interfaceInfo.getDpId())) {
             setupKnownSmacFlow(elanInfo, interfaceInfo, macTimeout, macAddress, mdsalManager,
                 writeFlowGroupTx);
@@ -596,7 +644,7 @@ public class ElanUtils {
     }
 
     public void setupDMacFlowOnRemoteDpn(ElanInstance elanInfo, InterfaceInfo interfaceInfo, BigInteger dstDpId,
-                                         String macAddress, WriteTransaction writeFlowTx) throws ElanException {
+                                         String macAddress, TypedWriteTransaction<Configuration> writeFlowTx) {
         String elanInstanceName = elanInfo.getElanInstanceName();
         setupRemoteDmacFlow(dstDpId, interfaceInfo.getDpId(), interfaceInfo.getInterfaceTag(), elanInfo.getElanTag(),
                 macAddress, elanInstanceName, writeFlowTx, interfaceInfo.getInterfaceName(), elanInfo);
@@ -610,9 +658,10 @@ public class ElanUtils {
      * learnt.
      */
     private void setupKnownSmacFlow(ElanInstance elanInfo, InterfaceInfo interfaceInfo, long macTimeout,
-            String macAddress, IMdsalApiManager mdsalApiManager, WriteTransaction writeFlowGroupTx) {
+            String macAddress, IMdsalApiManager mdsalApiManager,
+            TypedWriteTransaction<Configuration> writeFlowGroupTx) {
         FlowEntity flowEntity = buildKnownSmacFlow(elanInfo, interfaceInfo, macTimeout, macAddress);
-        mdsalApiManager.addFlowToTx(flowEntity, writeFlowGroupTx);
+        mdsalApiManager.addFlow(writeFlowGroupTx, flowEntity);
         LOG.debug("Known Smac flow entry created for elan Name:{}, logical Interface port:{} and mac address:{}",
                 elanInfo.getElanInstanceName(), elanInfo.getDescription(), macAddress);
     }
@@ -651,7 +700,7 @@ public class ElanUtils {
         if (etreeInterface == null || etreeInterface.getEtreeInterfaceType() == EtreeInterfaceType.Root) {
             return elanInfo.getElanTag();
         } else { // Leaf
-            EtreeInstance etreeInstance = elanInfo.getAugmentation(EtreeInstance.class);
+            EtreeInstance etreeInstance = elanInfo.augmentation(EtreeInstance.class);
             if (etreeInstance == null) {
                 LOG.warn("EtreeInterface {} is connected to a non-Etree network: {}",
                          interfaceInfo.getInterfaceName(), elanInfo.getElanInstanceName());
@@ -675,7 +724,7 @@ public class ElanUtils {
      *            the writeFLowGroup tx
      */
     public void setupTermDmacFlows(InterfaceInfo interfaceInfo, IMdsalApiManager mdsalApiManager,
-                                   WriteTransaction writeFlowGroupTx) {
+                                   TypedWriteTransaction<Configuration> writeFlowGroupTx) {
         BigInteger dpId = interfaceInfo.getDpId();
         int lportTag = interfaceInfo.getInterfaceTag();
         Flow flow = MDSALUtil.buildFlowNew(NwConstants.INTERNAL_TUNNEL_TABLE,
@@ -684,7 +733,7 @@ public class ElanUtils {
                 ITMConstants.COOKIE_ITM.add(BigInteger.valueOf(lportTag)),
                 getTunnelIdMatchForFilterEqualsLPortTag(lportTag),
                 getInstructionsInPortForOutGroup(interfaceInfo.getInterfaceName()));
-        mdsalApiManager.addFlowToTx(dpId, flow, writeFlowGroupTx);
+        mdsalApiManager.addFlow(writeFlowGroupTx, dpId, flow);
         LOG.debug("Terminating service table flow entry created on dpn:{} for logical Interface port:{}", dpId,
                 interfaceInfo.getPortName());
     }
@@ -773,8 +822,7 @@ public class ElanUtils {
 
     private void setupOrigDmacFlows(ElanInstance elanInfo, InterfaceInfo interfaceInfo, String macAddress,
                                     boolean configureRemoteFlows, IMdsalApiManager mdsalApiManager,
-                                    WriteTransaction writeFlowGroupTx)
-                                    throws ElanException {
+                                    TypedWriteTransaction<Configuration> writeFlowGroupTx) {
         BigInteger dpId = interfaceInfo.getDpId();
         String ifName = interfaceInfo.getInterfaceName();
         long ifTag = interfaceInfo.getInterfaceTag();
@@ -832,15 +880,15 @@ public class ElanUtils {
     }
 
     private void setupLocalDmacFlow(long elanTag, BigInteger dpId, String ifName, String macAddress,
-            ElanInstance elanInfo, IMdsalApiManager mdsalApiManager, long ifTag, WriteTransaction writeFlowGroupTx) {
+            ElanInstance elanInfo, IMdsalApiManager mdsalApiManager, long ifTag,
+            TypedWriteTransaction<Configuration> writeFlowGroupTx) {
         Flow flowEntity = buildLocalDmacFlowEntry(elanTag, dpId, ifName, macAddress, elanInfo, ifTag);
-        mdsalApiManager.addFlowToTx(dpId, flowEntity, writeFlowGroupTx);
-        installEtreeLocalDmacFlow(elanTag, dpId, ifName, macAddress, elanInfo,
-                ifTag, writeFlowGroupTx);
+        mdsalApiManager.addFlow(writeFlowGroupTx, dpId, flowEntity);
+        installEtreeLocalDmacFlow(elanTag, dpId, ifName, macAddress, elanInfo, ifTag, writeFlowGroupTx);
     }
 
     private void installEtreeLocalDmacFlow(long elanTag, BigInteger dpId, String ifName, String macAddress,
-            ElanInstance elanInfo, long ifTag, WriteTransaction writeFlowGroupTx) {
+            ElanInstance elanInfo, long ifTag, TypedWriteTransaction<Configuration> writeFlowGroupTx) {
         EtreeInterface etreeInterface = elanInterfaceCache.getEtreeInterface(ifName).orNull();
         if (etreeInterface != null && etreeInterface.getEtreeInterfaceType() == EtreeInterfaceType.Root) {
             EtreeLeafTagName etreeTagName = elanEtreeUtils.getEtreeLeafTagByElanTag(elanTag);
@@ -850,31 +898,28 @@ public class ElanUtils {
             } else {
                 Flow flowEntity = buildLocalDmacFlowEntry(etreeTagName.getEtreeLeafTag().getValue(), dpId, ifName,
                         macAddress, elanInfo, ifTag);
-                mdsalManager.addFlowToTx(dpId, flowEntity, writeFlowGroupTx);
+                mdsalManager.addFlow(writeFlowGroupTx, dpId, flowEntity);
             }
         }
     }
 
     public static String getKnownDynamicmacFlowRef(short tableId, BigInteger dpId, long lporTag, String macAddress,
             long elanTag) {
-        return new StringBuffer().append(tableId).append(elanTag).append(dpId).append(lporTag).append(macAddress)
-                .toString();
+        return String.valueOf(tableId) + elanTag + dpId + lporTag + macAddress;
     }
 
     public static String getKnownDynamicmacFlowRef(short tableId, BigInteger dpId, BigInteger remoteDpId,
             String macAddress, long elanTag) {
-        return new StringBuffer().append(tableId).append(elanTag).append(dpId).append(remoteDpId).append(macAddress)
-                .toString();
+        return String.valueOf(tableId) + elanTag + dpId + remoteDpId + macAddress;
     }
 
     public static String getKnownDynamicmacFlowRef(short tableId, BigInteger dpId, String macAddress, long elanTag) {
-        return new StringBuffer().append(tableId).append(elanTag).append(dpId).append(macAddress).toString();
+        return String.valueOf(tableId) + elanTag + dpId + macAddress;
     }
 
     public static String getKnownDynamicmacFlowRef(short elanDmacTable, BigInteger dpId, String extDeviceNodeId,
             String dstMacAddress, long elanTag, boolean shFlag) {
-        return new StringBuffer().append(elanDmacTable).append(elanTag).append(dpId).append(extDeviceNodeId)
-                .append(dstMacAddress).append(shFlag).toString();
+        return String.valueOf(elanDmacTable) + elanTag + dpId + extDeviceNodeId + dstMacAddress + shFlag;
     }
 
     /**
@@ -917,9 +962,9 @@ public class ElanUtils {
         return flow;
     }
 
-    public void setupRemoteDmacFlow(BigInteger srcDpId, BigInteger destDpId, int lportTag, long elanTag, String
-            macAddress, String displayName, WriteTransaction writeFlowGroupTx, String interfaceName, ElanInstance
-            elanInstance) throws ElanException {
+    public void setupRemoteDmacFlow(BigInteger srcDpId, BigInteger destDpId, int lportTag, long elanTag,
+            String macAddress, String displayName, TypedWriteTransaction<Configuration> writeFlowGroupTx,
+            String interfaceName, ElanInstance elanInstance) {
         if (interfaceManager.isExternalInterface(interfaceName)) {
             LOG.debug("Ignoring install remote DMAC {} flow on provider interface {} elan {}",
                     macAddress, interfaceName, elanInstance.getElanInstanceName());
@@ -928,30 +973,30 @@ public class ElanUtils {
         Flow flowEntity;
         // if openstack-vni-semantics are enforced, segmentation ID is passed as network VNI for VxLAN based provider
         // networks, 0 otherwise
-        long lportTagOrVni = !isOpenstackVniSemanticsEnforced() ? lportTag : isVxlan(elanInstance)
-                ? elanInstance.getSegmentationId() : 0;
+        long lportTagOrVni = !isOpenstackVniSemanticsEnforced() ? lportTag : isVxlanNetworkOrVxlanSegment(elanInstance)
+                ? getVxlanSegmentationId(elanInstance) : 0;
         flowEntity = buildRemoteDmacFlowEntry(srcDpId, destDpId, lportTagOrVni, elanTag, macAddress, displayName,
                 elanInstance);
-        mdsalManager.addFlowToTx(srcDpId, flowEntity, writeFlowGroupTx);
+        mdsalManager.addFlow(writeFlowGroupTx, srcDpId, flowEntity);
         setupEtreeRemoteDmacFlow(srcDpId, destDpId, lportTagOrVni, elanTag, macAddress, displayName, interfaceName,
                 writeFlowGroupTx, elanInstance);
     }
 
     private void setupEtreeRemoteDmacFlow(BigInteger srcDpId, BigInteger destDpId, long lportTagOrVni, long elanTag,
                                           String macAddress, String displayName, String interfaceName,
-                                          WriteTransaction writeFlowGroupTx, ElanInstance elanInstance)
-                                          throws ElanException {
+                                          TypedWriteTransaction<Configuration> writeFlowGroupTx,
+                                          ElanInstance elanInstance) {
         Flow flowEntity;
         EtreeInterface etreeInterface = elanInterfaceCache.getEtreeInterface(interfaceName).orNull();
         if (etreeInterface != null && etreeInterface.getEtreeInterfaceType() == EtreeInterfaceType.Root) {
             EtreeLeafTagName etreeTagName = elanEtreeUtils.getEtreeLeafTagByElanTag(elanTag);
             if (etreeTagName == null) {
-                LOG.warn("Interface " + interfaceName
-                        + " seems like it belongs to Etree but etreeTagName from elanTag " + elanTag + " is null.");
+                LOG.warn("Interface {} seems like it belongs to Etree but etreeTagName from elanTag {} is null.",
+                        interfaceName, elanTag);
             } else {
                 flowEntity = buildRemoteDmacFlowEntry(srcDpId, destDpId, lportTagOrVni,
                         etreeTagName.getEtreeLeafTag().getValue(), macAddress, displayName, elanInstance);
-                mdsalManager.addFlowToTx(srcDpId, flowEntity, writeFlowGroupTx);
+                mdsalManager.addFlow(writeFlowGroupTx, srcDpId, flowEntity);
             }
         }
     }
@@ -977,11 +1022,10 @@ public class ElanUtils {
      * @param elanInstance
      *            elanInstance
      * @return the flow remote Dmac
-     * @throws ElanException in case of issues creating the flow objects
      */
     @SuppressWarnings("checkstyle:IllegalCatch")
     public Flow buildRemoteDmacFlowEntry(BigInteger srcDpId, BigInteger destDpId, long lportTagOrVni, long elanTag,
-            String macAddress, String displayName, ElanInstance elanInstance) throws ElanException {
+            String macAddress, String displayName, ElanInstance elanInstance) {
         List<MatchInfo> mkMatches = new ArrayList<>();
         mkMatches.add(new MatchMetadata(ElanHelper.getElanMetadataLabel(elanTag), MetaDataUtil.METADATA_MASK_SERVICE));
         mkMatches.add(new MatchEthernetDestination(new MacAddress(macAddress)));
@@ -991,20 +1035,20 @@ public class ElanUtils {
         // List of Action for the provided Source and Destination DPIDs
         try {
             List<Action> actions = null;
-            if (isVlan(elanInstance) || isFlat(elanInstance)) {
+            if (isVxlanNetworkOrVxlanSegment(elanInstance)) {
+                actions = elanItmUtils.getInternalTunnelItmEgressAction(srcDpId, destDpId, lportTagOrVni);
+            } else if (isVlan(elanInstance) || isFlat(elanInstance)) {
                 String interfaceName = getExternalElanInterface(elanInstance.getElanInstanceName(), srcDpId);
                 if (null == interfaceName) {
                     LOG.info("buildRemoteDmacFlowEntry: Could not find interfaceName for {} {}", srcDpId,
-                        elanInstance);
+                            elanInstance);
                 }
                 actions = getEgressActionsForInterface(interfaceName, null);
-            } else if (isVxlan(elanInstance)) {
-                actions = elanItmUtils.getInternalTunnelItmEgressAction(srcDpId, destDpId, lportTagOrVni);
             }
             mkInstructions.add(MDSALUtil.buildApplyActionsInstruction(actions));
         } catch (Exception e) {
-            LOG.error("Could not get egress actions to add to flow for srcDpId=" + srcDpId + ", destDpId=" + destDpId
-                    + ", lportTag/VNI=" + lportTagOrVni, e);
+            LOG.error("Could not get egress actions to add to flow for srcDpId {}, destDpId {}, lportTag/VNI {}",
+                    srcDpId,  destDpId, lportTagOrVni, e);
         }
 
         Flow flow = MDSALUtil.buildFlowNew(NwConstants.ELAN_DMAC_TABLE,
@@ -1018,19 +1062,21 @@ public class ElanUtils {
 
     }
 
-    public void deleteMacFlows(ElanInstance elanInfo, InterfaceInfo interfaceInfo, MacEntry macEntry,
-            WriteTransaction deleteFlowGroupTx) {
+    public void deleteMacFlows(@Nullable ElanInstance elanInfo, @Nullable InterfaceInfo interfaceInfo,
+            MacEntry macEntry, TypedReadWriteTransaction<Configuration> flowTx)
+            throws ExecutionException, InterruptedException {
         if (elanInfo == null || interfaceInfo == null) {
             return;
         }
         String macAddress = macEntry.getMacAddress().getValue();
         synchronized (getElanMacDPNKey(elanInfo.getElanTag(), macAddress, interfaceInfo.getDpId())) {
-            deleteMacFlows(elanInfo, interfaceInfo, macAddress, /* alsoDeleteSMAC */ true, deleteFlowGroupTx);
+            deleteMacFlows(elanInfo, interfaceInfo, macAddress, /* alsoDeleteSMAC */ true, flowTx);
         }
     }
 
     public void deleteMacFlows(ElanInstance elanInfo, InterfaceInfo interfaceInfo, String macAddress,
-            boolean deleteSmac, WriteTransaction deleteFlowGroupTx) {
+            boolean deleteSmac, TypedReadWriteTransaction<Configuration> flowTx)
+            throws ExecutionException, InterruptedException {
         String elanInstanceName = elanInfo.getElanInstanceName();
         List<DpnInterfaces> remoteFEs = getInvolvedDpnsInElan(elanInstanceName);
         BigInteger srcdpId = interfaceInfo.getDpId();
@@ -1039,40 +1085,39 @@ public class ElanUtils {
             Long elanTag = elanInfo.getElanTag();
             BigInteger dstDpId = dpnInterface.getDpId();
             if (executeDeleteMacFlows(elanInfo, interfaceInfo, macAddress, deleteSmac, elanInstanceName, srcdpId,
-                    elanTag, dstDpId, deleteFlowGroupTx)) {
+                    elanTag, dstDpId, flowTx)) {
                 isFlowsRemovedInSrcDpn = true;
             }
             executeEtreeDeleteMacFlows(elanInfo, interfaceInfo, macAddress, deleteSmac, elanInstanceName, srcdpId,
-                    elanTag, dstDpId, deleteFlowGroupTx);
+                    elanTag, dstDpId, flowTx);
         }
         if (!isFlowsRemovedInSrcDpn) {
-            deleteSmacAndDmacFlows(elanInfo, interfaceInfo, macAddress, deleteSmac, deleteFlowGroupTx);
+            deleteSmacAndDmacFlows(elanInfo, interfaceInfo, macAddress, deleteSmac, flowTx);
         }
     }
 
     private void executeEtreeDeleteMacFlows(ElanInstance elanInfo, InterfaceInfo interfaceInfo, String macAddress,
             boolean deleteSmac, String elanInstanceName, BigInteger srcdpId, Long elanTag, BigInteger dstDpId,
-            WriteTransaction deleteFlowGroupTx) {
+            TypedReadWriteTransaction<Configuration> flowTx) throws ExecutionException, InterruptedException {
         EtreeLeafTagName etreeLeafTag = elanEtreeUtils.getEtreeLeafTagByElanTag(elanTag);
         if (etreeLeafTag != null) {
             executeDeleteMacFlows(elanInfo, interfaceInfo, macAddress, deleteSmac, elanInstanceName, srcdpId,
-                    etreeLeafTag.getEtreeLeafTag().getValue(), dstDpId, deleteFlowGroupTx);
+                    etreeLeafTag.getEtreeLeafTag().getValue(), dstDpId, flowTx);
         }
     }
 
     private boolean executeDeleteMacFlows(ElanInstance elanInfo, InterfaceInfo interfaceInfo, String macAddress,
             boolean deleteSmac, String elanInstanceName, BigInteger srcdpId, Long elanTag, BigInteger dstDpId,
-            WriteTransaction deleteFlowGroupTx) {
+            TypedReadWriteTransaction<Configuration> flowTx) throws ExecutionException, InterruptedException {
         boolean isFlowsRemovedInSrcDpn = false;
         if (dstDpId.equals(srcdpId)) {
             isFlowsRemovedInSrcDpn = true;
-            deleteSmacAndDmacFlows(elanInfo, interfaceInfo, macAddress, deleteSmac, deleteFlowGroupTx);
+            deleteSmacAndDmacFlows(elanInfo, interfaceInfo, macAddress, deleteSmac, flowTx);
         } else if (isDpnPresent(dstDpId)) {
             mdsalManager
-                    .removeFlowToTx(dstDpId,
-                            MDSALUtil.buildFlow(NwConstants.ELAN_DMAC_TABLE, getKnownDynamicmacFlowRef(
-                                    NwConstants.ELAN_DMAC_TABLE, dstDpId, srcdpId, macAddress, elanTag)),
-                            deleteFlowGroupTx);
+                .removeFlow(flowTx, dstDpId,
+                    MDSALUtil.buildFlow(NwConstants.ELAN_DMAC_TABLE, getKnownDynamicmacFlowRef(
+                        NwConstants.ELAN_DMAC_TABLE, dstDpId, srcdpId, macAddress, elanTag)));
             LOG.debug("Dmac flow entry deleted for elan:{}, logical interface port:{} and mac address:{} on dpn:{}",
                     elanInstanceName, interfaceInfo.getPortName(), macAddress, dstDpId);
         }
@@ -1080,22 +1125,21 @@ public class ElanUtils {
     }
 
     private void deleteSmacAndDmacFlows(ElanInstance elanInfo, InterfaceInfo interfaceInfo, String macAddress,
-            boolean deleteSmac, WriteTransaction deleteFlowGroupTx) {
+            boolean deleteSmac, TypedReadWriteTransaction<Configuration> flowTx)
+            throws ExecutionException, InterruptedException {
         String elanInstanceName = elanInfo.getElanInstanceName();
         long ifTag = interfaceInfo.getInterfaceTag();
         BigInteger srcdpId = interfaceInfo.getDpId();
         Long elanTag = elanInfo.getElanTag();
         if (deleteSmac) {
             mdsalManager
-                    .removeFlowToTx(srcdpId,
+                    .removeFlow(flowTx, srcdpId,
                             MDSALUtil.buildFlow(NwConstants.ELAN_SMAC_TABLE, getKnownDynamicmacFlowRef(
-                                    NwConstants.ELAN_SMAC_TABLE, srcdpId, ifTag, macAddress, elanTag)),
-                            deleteFlowGroupTx);
+                                    NwConstants.ELAN_SMAC_TABLE, srcdpId, ifTag, macAddress, elanTag)));
         }
-        mdsalManager.removeFlowToTx(srcdpId,
-                MDSALUtil.buildFlow(NwConstants.ELAN_DMAC_TABLE,
-                        getKnownDynamicmacFlowRef(NwConstants.ELAN_DMAC_TABLE, srcdpId, ifTag, macAddress, elanTag)),
-                deleteFlowGroupTx);
+        mdsalManager.removeFlow(flowTx, srcdpId,
+            MDSALUtil.buildFlow(NwConstants.ELAN_DMAC_TABLE,
+                getKnownDynamicmacFlowRef(NwConstants.ELAN_DMAC_TABLE, srcdpId, ifTag, macAddress, elanTag)));
         LOG.debug("All the required flows deleted for elan:{}, logical Interface port:{} and MAC address:{} on dpn:{}",
                 elanInstanceName, interfaceInfo.getPortName(), macAddress, srcdpId);
     }
@@ -1104,40 +1148,37 @@ public class ElanUtils {
      * Updates the Elan information in the Operational DS. It also updates the
      * ElanInstance in the Config DS by setting the adquired elanTag.
      *
-     * @param broker
-     *            the broker
      * @param idManager
      *            the id manager
      * @param elanInstanceAdded
      *            the elan instance added
      * @param elanInterfaces
      *            the elan interfaces
-     * @param tx
+     * @param operTx
      *            transaction
      *
      * @return the updated ELAN instance.
      */
-    public static ElanInstance updateOperationalDataStore(DataBroker broker, IdManagerService idManager,
-            ElanInstance elanInstanceAdded, List<String> elanInterfaces, WriteTransaction tx) {
+    public static ElanInstance updateOperationalDataStore(IdManagerService idManager,
+            ElanInstance elanInstanceAdded, List<String> elanInterfaces, TypedWriteTransaction<Configuration> confTx,
+            TypedWriteTransaction<Operational> operTx) {
         String elanInstanceName = elanInstanceAdded.getElanInstanceName();
         Long elanTag = elanInstanceAdded.getElanTag();
         if (elanTag == null || elanTag == 0L) {
             elanTag = retrieveNewElanTag(idManager, elanInstanceName);
         }
         Elan elanInfo = new ElanBuilder().setName(elanInstanceName).setElanInterfaces(elanInterfaces)
-                .setKey(new ElanKey(elanInstanceName)).build();
+                .withKey(new ElanKey(elanInstanceName)).build();
 
         // Add the ElanState in the elan-state operational data-store
-        tx.put(LogicalDatastoreType.OPERATIONAL, getElanInstanceOperationalDataPath(elanInstanceName),
-                elanInfo, WriteTransaction.CREATE_MISSING_PARENTS);
+        operTx.put(getElanInstanceOperationalDataPath(elanInstanceName), elanInfo, CREATE_MISSING_PARENTS);
 
         // Add the ElanMacTable in the elan-mac-table operational data-store
-        MacTable elanMacTable = new MacTableBuilder().setKey(new MacTableKey(elanInstanceName)).build();
-        tx.put(LogicalDatastoreType.OPERATIONAL, getElanMacTableOperationalDataPath(elanInstanceName),
-                elanMacTable, WriteTransaction.CREATE_MISSING_PARENTS);
+        MacTable elanMacTable = new MacTableBuilder().withKey(new MacTableKey(elanInstanceName)).build();
+        operTx.put(getElanMacTableOperationalDataPath(elanInstanceName), elanMacTable, CREATE_MISSING_PARENTS);
 
         ElanTagNameBuilder elanTagNameBuilder = new ElanTagNameBuilder().setElanTag(elanTag)
-                .setKey(new ElanTagNameKey(elanTag)).setName(elanInstanceName);
+                .withKey(new ElanTagNameKey(elanTag)).setName(elanInstanceName);
         long etreeLeafTag = -1;
         if (isEtreeInstance(elanInstanceAdded)) {
             etreeLeafTag = retrieveNewElanTag(idManager,elanInstanceName + ElanConstants
@@ -1145,14 +1186,13 @@ public class ElanUtils {
             EtreeLeafTagName etreeLeafTagName = new EtreeLeafTagNameBuilder()
                     .setEtreeLeafTag(new EtreeLeafTag(etreeLeafTag)).build();
             elanTagNameBuilder.addAugmentation(EtreeLeafTagName.class, etreeLeafTagName);
-            addTheLeafTagAsElanTag(broker, elanInstanceName, etreeLeafTag, tx);
+            addTheLeafTagAsElanTag(elanInstanceName, etreeLeafTag, operTx);
         }
         ElanTagName elanTagName = elanTagNameBuilder.build();
 
         // Add the ElanTag to ElanName in the elan-tag-name Operational
         // data-store
-        tx.put(LogicalDatastoreType.OPERATIONAL,
-                getElanInfoEntriesOperationalDataPath(elanTag), elanTagName);
+        operTx.put(getElanInfoEntriesOperationalDataPath(elanTag), elanTagName);
 
         // Updates the ElanInstance Config DS by setting the just acquired
         // elanTag
@@ -1160,28 +1200,27 @@ public class ElanUtils {
                 .setDescription(elanInstanceAdded.getDescription())
                 .setMacTimeout(elanInstanceAdded.getMacTimeout() == null
                         ? Long.valueOf(ElanConstants.DEFAULT_MAC_TIME_OUT) : elanInstanceAdded.getMacTimeout())
-                .setKey(elanInstanceAdded.getKey()).setElanTag(elanTag);
+                .withKey(elanInstanceAdded.key()).setElanTag(elanTag);
         if (isEtreeInstance(elanInstanceAdded)) {
             EtreeInstance etreeInstance = new EtreeInstanceBuilder().setEtreeLeafTagVal(new EtreeLeafTag(etreeLeafTag))
                     .build();
             elanInstanceBuilder.addAugmentation(EtreeInstance.class, etreeInstance);
         }
         ElanInstance elanInstanceWithTag = elanInstanceBuilder.build();
-        tx.merge(LogicalDatastoreType.CONFIGURATION, ElanHelper.getElanInstanceConfigurationDataPath(elanInstanceName),
-                elanInstanceWithTag, WriteTransaction.CREATE_MISSING_PARENTS);
+        confTx.merge(ElanHelper.getElanInstanceConfigurationDataPath(elanInstanceName), elanInstanceWithTag,
+            CREATE_MISSING_PARENTS);
         return elanInstanceWithTag;
     }
 
-    private static void addTheLeafTagAsElanTag(DataBroker broker, String elanInstanceName, long etreeLeafTag,
-            WriteTransaction tx) {
+    private static void addTheLeafTagAsElanTag(String elanInstanceName, long etreeLeafTag,
+            TypedWriteTransaction<Operational> tx) {
         ElanTagName etreeTagAsElanTag = new ElanTagNameBuilder().setElanTag(etreeLeafTag)
-                .setKey(new ElanTagNameKey(etreeLeafTag)).setName(elanInstanceName).build();
-        tx.put(LogicalDatastoreType.OPERATIONAL,
-                getElanInfoEntriesOperationalDataPath(etreeLeafTag), etreeTagAsElanTag);
+                .withKey(new ElanTagNameKey(etreeLeafTag)).setName(elanInstanceName).build();
+        tx.put(getElanInfoEntriesOperationalDataPath(etreeLeafTag), etreeTagAsElanTag);
     }
 
     private static boolean isEtreeInstance(ElanInstance elanInstanceAdded) {
-        return elanInstanceAdded.getAugmentation(EtreeInstance.class) != null;
+        return elanInstanceAdded.augmentation(EtreeInstance.class) != null;
     }
 
     public boolean isDpnPresent(BigInteger dpnId) {
@@ -1206,7 +1245,7 @@ public class ElanUtils {
             BigInteger cookie, List<Instruction> instructions) {
         StypeOpenflowBuilder augBuilder = new StypeOpenflowBuilder().setFlowCookie(cookie).setFlowPriority(flowPriority)
                 .setInstruction(instructions);
-        return new BoundServicesBuilder().setKey(new BoundServicesKey(servicePriority)).setServiceName(serviceName)
+        return new BoundServicesBuilder().withKey(new BoundServicesKey(servicePriority)).setServiceName(serviceName)
                 .setServicePriority(servicePriority).setServiceType(ServiceTypeFlowBased.class)
                 .addAugmentation(StypeOpenflow.class, augBuilder.build()).build();
     }
@@ -1228,9 +1267,10 @@ public class ElanUtils {
     public void removeTerminatingServiceAction(BigInteger destDpId, int serviceId) {
         RemoveTerminatingServiceActionsInput input = new RemoveTerminatingServiceActionsInputBuilder()
                 .setDpnId(destDpId).setServiceId(serviceId).build();
-        Future<RpcResult<Void>> futureObject = itmRpcService.removeTerminatingServiceActions(input);
+        Future<RpcResult<RemoveTerminatingServiceActionsOutput>> futureObject =
+                itmRpcService.removeTerminatingServiceActions(input);
         try {
-            RpcResult<Void> result = futureObject.get();
+            RpcResult<RemoveTerminatingServiceActionsOutput> result = futureObject.get();
             if (result.isSuccessful()) {
                 LOG.debug("Successfully completed removeTerminatingServiceActions for ELAN with serviceId {} on "
                                 + "dpn {}", serviceId, destDpId);
@@ -1240,7 +1280,7 @@ public class ElanUtils {
             }
         } catch (InterruptedException | ExecutionException e) {
             LOG.error("Error in RPC call removeTerminatingServiceActions for ELAN with serviceId {} on "
-                    + "dpn {}: {}", serviceId, destDpId, e);
+                    + "dpn {}", serviceId, destDpId, e);
         }
     }
 
@@ -1364,18 +1404,31 @@ public class ElanUtils {
         return idBuilder.build();
     }
 
+    @CheckReturnValue
     public static CheckedFuture<Void, TransactionCommitFailedException> waitForTransactionToComplete(
             WriteTransaction tx) {
         CheckedFuture<Void, TransactionCommitFailedException> futures = tx.submit();
         try {
             futures.get();
         } catch (InterruptedException | ExecutionException e) {
-            LOG.error("Error writing to datastore {}", e);
+            // NETVIRT-1215: Do not log.error() here, only debug(); but callers *MUST* @CheckReturnValue
+            LOG.debug("Error writing to datastore", e);
         }
         return futures;
     }
 
-    public static boolean isVxlan(ElanInstance elanInstance) {
+    @CheckReturnValue
+    public static ListenableFuture<Void> waitForTransactionToComplete(ListenableFuture<Void> future) {
+        try {
+            future.get();
+        } catch (InterruptedException | ExecutionException e) {
+            // NETVIRT-1215: Do not log.error() here, only debug(); but callers *MUST* @CheckReturnValue
+            LOG.debug("Error writing to datastore", e);
+        }
+        return future;
+    }
+
+    public static boolean isVxlan(@Nullable ElanInstance elanInstance) {
         return elanInstance != null && elanInstance.getSegmentType() != null
                 && elanInstance.getSegmentType().isAssignableFrom(SegmentTypeVxlan.class)
                 && elanInstance.getSegmentationId() != null && elanInstance.getSegmentationId() != 0;
@@ -1437,10 +1490,10 @@ public class ElanUtils {
     public void addDmacRedirectToDispatcherFlows(Long elanTag, String displayName,
             String macAddress, List<BigInteger> dpnIds) {
         for (BigInteger dpId : dpnIds) {
-            WriteTransaction writeTx = broker.newWriteOnlyTransaction();
-            mdsalManager.addFlowToTx(buildDmacRedirectToDispatcherFlow(dpId, macAddress, displayName, elanTag),
-                    writeTx);
-            writeTx.submit();
+            ListenableFutures.addErrorLogging(txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION,
+                tx -> mdsalManager.addFlow(tx, buildDmacRedirectToDispatcherFlow(dpId, macAddress, displayName,
+                        elanTag))), LOG,
+                "Error adding DMAC redirect to dispatcher flows");
         }
     }
 
@@ -1462,10 +1515,9 @@ public class ElanUtils {
 
         instructions.add(new InstructionApplyActions(actions));
         String flowId = getKnownDynamicmacFlowRef(NwConstants.ELAN_DMAC_TABLE, dpId, dstMacAddress, elanTag);
-        FlowEntity flow  = MDSALUtil.buildFlowEntity(dpId, NwConstants.ELAN_DMAC_TABLE, flowId, 20, displayName, 0, 0,
+        return MDSALUtil.buildFlowEntity(dpId, NwConstants.ELAN_DMAC_TABLE, flowId, 20, displayName, 0, 0,
                 ElanConstants.COOKIE_ELAN_KNOWN_DMAC.add(BigInteger.valueOf(elanTag)),
                 matches, instructions);
-        return flow;
     }
 
     public String getExternalElanInterface(String elanInstanceName, BigInteger dpnId) {
@@ -1495,12 +1547,14 @@ public class ElanUtils {
         return elanMacKey.intern();
     }
 
-    // TODO This should return a collection of futures
-    public static void addToListenableFutureIfTxException(RuntimeException exception,
-            List<ListenableFuture<Void>> futures) {
+    public static List<ListenableFuture<Void>>
+        returnFailedListenableFutureIfTransactionCommitFailedExceptionCauseOrElseThrow(RuntimeException exception) {
+
         Throwable cause = exception.getCause();
         if (cause != null && cause instanceof TransactionCommitFailedException) {
-            futures.add(Futures.immediateFailedCheckedFuture((TransactionCommitFailedException) cause));
+            return Collections.singletonList(Futures.immediateFailedFuture(cause));
+        } else {
+            throw exception;
         }
     }
 
@@ -1607,12 +1661,16 @@ public class ElanUtils {
         org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang
             .ietf.interfaces.rev140508.interfaces.Interface configIface =
             interfaceManager.getInterfaceInfoFromConfigDataStore(interfaceName);
-        IfTunnel ifTunnel = configIface.getAugmentation(IfTunnel.class);
+        if (configIface == null) {
+            configIface = iitmProvider.getInterface(interfaceName);
+        }
+        if (configIface == null) {
+            return  false;
+        }
+        IfTunnel ifTunnel = configIface.augmentation(IfTunnel.class);
         if (ifTunnel != null && ifTunnel.getTunnelInterfaceType().isAssignableFrom(TunnelTypeVxlan.class)) {
-            ParentRefs refs = configIface.getAugmentation(ParentRefs.class);
-            if (refs != null && !Strings.isNullOrEmpty(refs.getParentInterface())) {
-                return true; //multiple VxLAN tunnels enabled, i.e. only logical tunnel should be treated
-            }
+            ParentRefs refs = configIface.augmentation(ParentRefs.class);
+            return refs != null && !Strings.isNullOrEmpty(refs.getParentInterface());
         }
         return false;
     }
@@ -1622,10 +1680,10 @@ public class ElanUtils {
         org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId nodeId =
                 new org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId("openflow:" + dpnId);
         org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node nodeDpn =
-                new NodeBuilder().setId(nodeId).setKey(new NodeKey(nodeId)).build();
+                new NodeBuilder().setId(nodeId).withKey(new NodeKey(nodeId)).build();
         return InstanceIdentifier.builder(Nodes.class)
                 .child(org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node.class,
-                        nodeDpn.getKey()).augmentation(FlowCapableNode.class)
+                        nodeDpn.key()).augmentation(FlowCapableNode.class)
                 .child(Table.class, new TableKey(flow.getTableId())).child(Flow.class, flowKey).build();
     }
 
@@ -1639,6 +1697,33 @@ public class ElanUtils {
                 ipAddress);
         ArpResponderUtil.removeFlow(mdsalManager, dpnId, ArpResponderUtil.getFlowId(lportTag, ipAddress));
     }
+
+    public static String getRouterPordIdFromElanInstance(DataBroker dataBroker, String elanInstanceName) {
+        Optional<Subnetmaps> subnetMapsData =
+                read(dataBroker, LogicalDatastoreType.CONFIGURATION, buildSubnetMapsWildCardPath());
+        if (subnetMapsData.isPresent()) {
+            List<Subnetmap> subnetMapList = subnetMapsData.get().getSubnetmap();
+            if (subnetMapList != null && !subnetMapList.isEmpty()) {
+                for (Subnetmap subnet : subnetMapList) {
+                    if (subnet.getNetworkId().getValue().equals(elanInstanceName)) {
+                        if (subnet.getRouterInterfacePortId() != null) {
+                            return subnet.getRouterInterfacePortId().getValue();
+                        }
+                    }
+                }
+            }
+        }
+        return null;
+    }
+
+    static InstanceIdentifier<Subnetmaps> buildSubnetMapsWildCardPath() {
+        return InstanceIdentifier.create(Subnetmaps.class);
+    }
+
+    public static InstanceIdentifier<Group> getGroupInstanceid(BigInteger dpnId, long groupId) {
+        return InstanceIdentifier.builder(Nodes.class).child(Node.class, new NodeKey(new NodeId("openflow:" + dpnId)))
+                .augmentation(FlowCapableNode.class).child(Group.class, new GroupKey(new GroupId(groupId))).build();
+    }
 }