Migrate ListenableFutures.addErrorLogging() users
[netvirt.git] / vpnmanager / impl / src / main / java / org / opendaylight / netvirt / vpnmanager / VpnInstanceListener.java
index 753610386dc1e4d510d9438c9c4b88b190d5336d..a77c0c9a8647464e4a14e9759c9babac36150fd3 100644 (file)
@@ -7,11 +7,9 @@
  */
 package org.opendaylight.netvirt.vpnmanager;
 
-import static org.opendaylight.controller.md.sal.binding.api.WriteTransaction.CREATE_MISSING_PARENTS;
 import static org.opendaylight.genius.infra.Datastore.CONFIGURATION;
 import static org.opendaylight.genius.infra.Datastore.OPERATIONAL;
 
-import com.google.common.base.Optional;
 import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.ListenableFuture;
@@ -21,16 +19,15 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.Map;
+import java.util.Optional;
 import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
 import java.util.concurrent.locks.ReentrantLock;
-import javax.annotation.PostConstruct;
+import javax.annotation.PreDestroy;
 import javax.inject.Inject;
 import javax.inject.Singleton;
 import org.eclipse.jdt.annotation.Nullable;
-import org.opendaylight.controller.md.sal.binding.api.DataBroker;
-import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
-import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
-import org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase;
 import org.opendaylight.genius.datastoreutils.SingleTransactionDataBroker;
 import org.opendaylight.genius.infra.Datastore.Configuration;
 import org.opendaylight.genius.infra.Datastore.Operational;
@@ -51,24 +48,29 @@ import org.opendaylight.genius.mdsalutil.matches.MatchTunnelId;
 import org.opendaylight.genius.utils.JvmGlobalLocks;
 import org.opendaylight.genius.utils.SystemPropertyReader;
 import org.opendaylight.infrautils.jobcoordinator.JobCoordinator;
-import org.opendaylight.infrautils.utils.concurrent.ListenableFutures;
+import org.opendaylight.infrautils.utils.concurrent.Executors;
+import org.opendaylight.infrautils.utils.concurrent.LoggingFutures;
+import org.opendaylight.mdsal.binding.api.DataBroker;
+import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
 import org.opendaylight.netvirt.fibmanager.api.IFibManager;
-import org.opendaylight.yang.gen.v1.urn.huawei.params.xml.ns.yang.l3vpn.rev140815.VpnAfConfig;
-import org.opendaylight.yang.gen.v1.urn.huawei.params.xml.ns.yang.l3vpn.rev140815.VpnInstances;
-import org.opendaylight.yang.gen.v1.urn.huawei.params.xml.ns.yang.l3vpn.rev140815.vpn.af.config.VpnTargets;
-import org.opendaylight.yang.gen.v1.urn.huawei.params.xml.ns.yang.l3vpn.rev140815.vpn.af.config.vpntargets.VpnTarget;
-import org.opendaylight.yang.gen.v1.urn.huawei.params.xml.ns.yang.l3vpn.rev140815.vpn.instances.VpnInstance;
+import org.opendaylight.serviceutils.tools.listener.AbstractAsyncDataTreeChangeListener;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.idmanager.rev160406.IdManagerService;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.ExternalTunnelList;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.external.tunnel.list.ExternalTunnel;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.op.rev160406.external.tunnel.list.ExternalTunnelKey;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.DcGatewayIpList;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.dc.gateway.ip.list.DcGatewayIp;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rev160406.dc.gateway.ip.list.DcGatewayIpKey;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.id.to.vpn.instance.VpnIds;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.instance.op.data.VpnInstanceOpDataEntry;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.instance.op.data.VpnInstanceOpDataEntryBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.instance.op.data.vpn.instance.op.data.entry.VpnTargetsBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.instance.op.data.vpn.instance.op.data.entry.vpntargets.VpnTargetBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.instance.op.data.vpn.instance.op.data.entry.vpntargets.VpnTargetKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.l3vpn.rev200204.VpnInstances;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.l3vpn.rev200204.vpn.instances.VpnInstance;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.l3vpn.rev200204.vpn.instances.vpn.instance.VpnTargets;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.l3vpn.rev200204.vpn.instances.vpn.instance.vpntargets.VpnTarget;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 import org.opendaylight.yangtools.yang.common.Uint32;
 import org.opendaylight.yangtools.yang.common.Uint64;
@@ -76,7 +78,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 @Singleton
-public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInstance, VpnInstanceListener> {
+public class VpnInstanceListener extends AbstractAsyncDataTreeChangeListener<VpnInstance> {
     private static final Logger LOG = LoggerFactory.getLogger(VpnInstanceListener.class);
     private static final String LOGGING_PREFIX_ADD = "VPN-ADD:";
     private static final String LOGGING_PREFIX_UPDATE = "VPN-UPDATE:";
@@ -96,7 +98,9 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
             final VpnInterfaceManager vpnInterfaceManager, final IFibManager fibManager,
             final VpnOpDataSyncer vpnOpDataSyncer, final IMdsalApiManager mdsalManager,
             final JobCoordinator jobCoordinator, VpnUtil vpnUtil) {
-        super(VpnInstance.class, VpnInstanceListener.class);
+        super(dataBroker, LogicalDatastoreType.CONFIGURATION,
+                InstanceIdentifier.create(VpnInstances.class).child(VpnInstance.class),
+                Executors.newListeningSingleThreadExecutor("VpnInstanceListener", LOG));
         this.dataBroker = dataBroker;
         this.txRunner = new ManagedNewTransactionRunnerImpl(dataBroker);
         this.idManager = idManager;
@@ -106,26 +110,23 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
         this.mdsalManager = mdsalManager;
         this.jobCoordinator = jobCoordinator;
         this.vpnUtil = vpnUtil;
+        start();
     }
 
-    @PostConstruct
     public void start() {
         LOG.info("{} start", getClass().getSimpleName());
-        registerListener(LogicalDatastoreType.CONFIGURATION, dataBroker);
     }
 
     @Override
-    protected InstanceIdentifier<VpnInstance> getWildCardPath() {
-        return InstanceIdentifier.create(VpnInstances.class).child(VpnInstance.class);
+    @PreDestroy
+    public void close() {
+        super.close();
+        Executors.shutdownAndAwaitTermination(getExecutorService());
     }
 
-    @Override
-    protected VpnInstanceListener getDataTreeChangeListener() {
-        return VpnInstanceListener.this;
-    }
 
     @Override
-    protected void remove(InstanceIdentifier<VpnInstance> identifier, VpnInstance del) {
+    public void remove(InstanceIdentifier<VpnInstance> identifier, VpnInstance del) {
         LOG.trace("{} : VPN event key: {}, value: {}", LOGGING_PREFIX_DELETE, identifier, del);
         final String vpnName = del.getVpnInstanceName();
         Optional<VpnInstanceOpDataEntry> vpnOpValue;
@@ -139,7 +140,7 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
         try {
             vpnOpValue = SingleTransactionDataBroker.syncReadOptional(dataBroker, LogicalDatastoreType.OPERATIONAL,
                     VpnUtil.getVpnInstanceOpDataIdentifier(primaryRd));
-        } catch (ReadFailedException e) {
+        } catch (InterruptedException | ExecutionException e) {
             LOG.error("{}, failed to remove VPN: Exception while retrieving VpnInstanceOpDataEntry for VPN {}. ",
                     LOGGING_PREFIX_DELETE,  vpnName, e);
             return;
@@ -172,31 +173,31 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
     }
 
     @Override
-    protected void update(InstanceIdentifier<VpnInstance> identifier,
+    public void update(InstanceIdentifier<VpnInstance> identifier,
         VpnInstance original, VpnInstance update) {
         LOG.trace("VPN-UPDATE: update: VPN event key: {}, value: {}.", identifier, update);
         String vpnName = update.getVpnInstanceName();
-        if (original.getIpv4Family() != null && update.getIpv4Family() != null
-                && original.getIpv4Family().getRouteDistinguisher() != null
-                && update.getIpv4Family().getRouteDistinguisher() != null
-                && original.getIpv4Family().getRouteDistinguisher().size()
-                !=  update.getIpv4Family().getRouteDistinguisher().size()) {
+        if (original != null && update != null
+                && original.getRouteDistinguisher() != null
+                && update.getRouteDistinguisher() != null
+                && original.getRouteDistinguisher().size()
+                !=  update.getRouteDistinguisher().size()) {
             LOG.debug("VPN-UPDATE: VpnInstance:{} updated with new RDs: {} from old RDs: {}", vpnName,
-                    update.getIpv4Family().getRouteDistinguisher(),  original.getIpv4Family().getRouteDistinguisher());
-            vpnUtil.updateVpnInstanceWithRdList(vpnName, update.getIpv4Family().getRouteDistinguisher());
+                    update.getRouteDistinguisher(),  original.getRouteDistinguisher());
+            vpnUtil.updateVpnInstanceWithRdList(vpnName, update.getRouteDistinguisher());
         }
         vpnInterfaceManager.updateVpnInterfacesForUnProcessAdjancencies(vpnName);
     }
 
     @Override
-    protected void add(final InstanceIdentifier<VpnInstance> identifier, final VpnInstance value) {
+    public void add(final InstanceIdentifier<VpnInstance> identifier, final VpnInstance value) {
         LOG.trace("{} add: Add VPN event key: {}, value: {}", LOGGING_PREFIX_ADD, identifier, value);
         final String vpnName = value.getVpnInstanceName();
         jobCoordinator.enqueueJob("VPN-" + vpnName, new AddVpnInstanceWorker(dataBroker, value),
                 SystemPropertyReader.getDataStoreJobCoordinatorMaxRetries());
     }
 
-    private class AddVpnInstanceWorker implements Callable<List<ListenableFuture<Void>>> {
+    private class AddVpnInstanceWorker implements Callable<List<? extends ListenableFuture<?>>> {
         private final Logger log = LoggerFactory.getLogger(AddVpnInstanceWorker.class);
         VpnInstance vpnInstance;
         DataBroker broker;
@@ -215,9 +216,9 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
             futures.add(txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION, confTx -> {
                 ListenableFuture<Void> future = txRunner.callWithNewWriteOnlyTransactionAndSubmit(OPERATIONAL, operTx ->
                         addVpnInstance(vpnInstance, confTx, operTx));
-                ListenableFutures.addErrorLogging(future, LOG, "{} call: error creating VPN {} rd {}",
+                LoggingFutures.addErrorLogging(future, LOG, "{} call: error creating VPN {} rd {}",
                         LOGGING_PREFIX_ADD, vpnInstance.getVpnInstanceName(),
-                        vpnInstance.getIpv4Family().getRouteDistinguisher());
+                        vpnInstance.getRouteDistinguisher());
                 futures.add(future);
             }));
             Futures.addCallback(Futures.allAsList(futures),
@@ -232,16 +233,15 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
     private void addVpnInstance(VpnInstance value, TypedWriteTransaction<Configuration> writeConfigTxn,
             TypedWriteTransaction<Operational> writeOperTxn) {
         if (writeConfigTxn == null) {
-            ListenableFutures.addErrorLogging(txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION, tx ->
+            LoggingFutures.addErrorLogging(txRunner.callWithNewWriteOnlyTransactionAndSubmit(CONFIGURATION, tx ->
                 addVpnInstance(value, tx, writeOperTxn)), LOG, "Error adding VPN instance {}", value);
             return;
         }
         if (writeOperTxn == null) {
-            ListenableFutures.addErrorLogging(txRunner.callWithNewWriteOnlyTransactionAndSubmit(OPERATIONAL, tx ->
+            LoggingFutures.addErrorLogging(txRunner.callWithNewWriteOnlyTransactionAndSubmit(OPERATIONAL, tx ->
                 addVpnInstance(value, writeConfigTxn, tx)), LOG, "Error adding VPN instance {}", value);
             return;
         }
-        VpnAfConfig config = value.getIpv4Family();
         String vpnInstanceName = value.getVpnInstanceName();
 
         Uint32 vpnId = vpnUtil.getUniqueId(VpnConstants.VPN_IDPOOL_NAME, vpnInstanceName);
@@ -256,13 +256,13 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
         org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn.instance.to.vpn.id.VpnInstance
             vpnInstanceToVpnId = VpnUtil.getVpnInstanceToVpnId(vpnInstanceName, vpnId, primaryRd);
 
-        writeConfigTxn.put(VpnOperDsUtils.getVpnInstanceToVpnIdIdentifier(vpnInstanceName),
-            vpnInstanceToVpnId, CREATE_MISSING_PARENTS);
+        writeConfigTxn.mergeParentStructurePut(VpnOperDsUtils.getVpnInstanceToVpnIdIdentifier(vpnInstanceName),
+            vpnInstanceToVpnId);
 
         VpnIds vpnIdToVpnInstance = VpnUtil.getVpnIdToVpnInstance(vpnId, value.getVpnInstanceName(),
             primaryRd, VpnUtil.isBgpVpn(vpnInstanceName, primaryRd));
 
-        writeConfigTxn.put(VpnUtil.getVpnIdToVpnInstanceIdentifier(vpnId), vpnIdToVpnInstance, CREATE_MISSING_PARENTS);
+        writeConfigTxn.mergeParentStructurePut(VpnUtil.getVpnIdToVpnInstanceIdentifier(vpnId), vpnIdToVpnInstance);
 
         try {
             String cachedTransType = fibManager.getConfTransType();
@@ -293,14 +293,16 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
             if (value.getL3vni() != null) {
                 builder.setL3vni(value.getL3vni());
             }
-            if (value.getType() == VpnInstance.Type.L2) {
+            if (value.isL2vpn()) {
                 builder.setType(VpnInstanceOpDataEntry.Type.L2);
             }
-            VpnTargets vpnTargets = config.getVpnTargets();
+            VpnTargets vpnTargets = value.getVpnTargets();
             if (vpnTargets != null) {
-                List<VpnTarget> vpnTargetList = vpnTargets.getVpnTarget();
-                if (vpnTargetList != null) {
-                    for (VpnTarget vpnTarget : vpnTargetList) {
+                @Nullable Map<org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.l3vpn.rev200204.vpn
+                        .instances.vpn.instance.vpntargets.VpnTargetKey, VpnTarget> vpnTargetListMap
+                        = vpnTargets.nonnullVpnTarget();
+                if (vpnTargetListMap != null) {
+                    for (VpnTarget vpnTarget : vpnTargetListMap.values()) {
                         VpnTargetBuilder vpnTargetBuilder =
                             new VpnTargetBuilder().withKey(new VpnTargetKey(vpnTarget.key().getVrfRTValue()))
                                 .setVrfRTType(org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.l3vpn.rev130911.vpn
@@ -314,12 +316,12 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
             VpnTargetsBuilder vpnTargetsBuilder = new VpnTargetsBuilder().setVpnTarget(opVpnTargetList);
             builder.setVpnTargets(vpnTargetsBuilder.build());
 
-            List<String> rds = config.getRouteDistinguisher();
+            List<String> rds = value.getRouteDistinguisher();
             builder.setRd(rds);
         } else {
             builder.setBgpvpnType(VpnInstanceOpDataEntry.BgpvpnType.VPN);
         }
-        writeOperTxn.merge(VpnUtil.getVpnInstanceOpDataIdentifier(primaryRd), builder.build(), CREATE_MISSING_PARENTS);
+        writeOperTxn.mergeParentStructureMerge(VpnUtil.getVpnInstanceOpDataIdentifier(primaryRd), builder.build());
         LOG.info("{} addVpnInstance: VpnInstanceOpData populated successfully for vpn {} rd {}", LOGGING_PREFIX_ADD,
                 vpnInstanceName, primaryRd);
     }
@@ -343,8 +345,7 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
             if rd is null, then its either a router vpn instance (or) a vlan external network vpn instance.
             if rd is non-null, then it is a bgpvpn instance
              */
-            VpnAfConfig config = vpnInstance.getIpv4Family();
-            List<String> rd = config.getRouteDistinguisher();
+            List<String> rd = vpnInstance.getRouteDistinguisher();
             if (rd == null || addBgpVrf()) {
                 notifyTask();
                 vpnInterfaceManager.vpnInstanceIsReady(vpnName);
@@ -369,15 +370,19 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
                         Arrays.asList(new InstructionWriteMetadata(MetaDataUtil.getVpnIdMetadata(vpnInstanceOpDataEntry
                                 .getVpnId().toJava()), MetaDataUtil.METADATA_MASK_VRFID),
                                 new InstructionGotoTable(NwConstants.L3_GW_MAC_TABLE));
-
-                for (Uint64 dpnId: NWUtil.getOperativeDPNs(dataBroker)) {
-                    String flowRef = getFibFlowRef(dpnId, NwConstants.L3VNI_EXTERNAL_TUNNEL_DEMUX_TABLE,
-                            vpnName, VpnConstants.DEFAULT_FLOW_PRIORITY);
-                    FlowEntity flowEntity = MDSALUtil.buildFlowEntity(dpnId,
-                            NwConstants.L3VNI_EXTERNAL_TUNNEL_DEMUX_TABLE, flowRef, VpnConstants.DEFAULT_FLOW_PRIORITY,
-                            "VxLAN VPN Tunnel Bind Service", 0, 0, NwConstants.COOKIE_VM_FIB_TABLE,
-                            mkMatches, instructions);
-                    mdsalManager.installFlow(dpnId, flowEntity);
+                try {
+                    for (Uint64 dpnId: NWUtil.getOperativeDPNs(dataBroker)) {
+                        String flowRef = getFibFlowRef(dpnId, NwConstants.L3VNI_EXTERNAL_TUNNEL_DEMUX_TABLE,
+                                vpnName, VpnConstants.DEFAULT_FLOW_PRIORITY);
+                        FlowEntity flowEntity = MDSALUtil.buildFlowEntity(dpnId,
+                                NwConstants.L3VNI_EXTERNAL_TUNNEL_DEMUX_TABLE, flowRef,
+                                VpnConstants.DEFAULT_FLOW_PRIORITY, "VxLAN VPN Tunnel Bind Service",
+                                0, 0, NwConstants.COOKIE_VM_FIB_TABLE, mkMatches, instructions);
+                        mdsalManager.installFlow(dpnId, flowEntity);
+                    }
+                } catch (ExecutionException | InterruptedException e) {
+                    LOG.error("PostAddVpnInstanceWorker: Exception while getting the list of Operative DPNs for Vpn {}",
+                            vpnName, e);
                 }
 
                 ///////////////////////
@@ -387,9 +392,10 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
         // TODO Clean up the exception handling
         @SuppressWarnings("checkstyle:IllegalCatch")
         private boolean addBgpVrf() {
-            VpnAfConfig config = vpnInstance.getIpv4Family();
             String primaryRd = vpnUtil.getPrimaryRd(vpnName);
-            List<VpnTarget> vpnTargetList = config.getVpnTargets().getVpnTarget();
+            @Nullable Map<org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.neutronvpn.l3vpn.rev200204.vpn
+                    .instances.vpn.instance.vpntargets.VpnTargetKey, VpnTarget> vpnTargetList
+                    = vpnInstance.getVpnTargets().getVpnTarget();
 
             if (vpnTargetList == null) {
                 log.error("{} addBgpVrf: vpn target list is empty for vpn {} RD {}", LOGGING_PREFIX_ADD,
@@ -433,8 +439,8 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
         InstanceIdentifier<VpnInstanceOpDataEntry> id = VpnUtil.getVpnInstanceOpDataIdentifier(rd);
         try {
             return SingleTransactionDataBroker.syncReadOptional(dataBroker, LogicalDatastoreType.OPERATIONAL,
-                    id).orNull();
-        } catch (ReadFailedException e) {
+                    id).orElse(null);
+        } catch (InterruptedException | ExecutionException e) {
             throw new RuntimeException("Error reading VPN instance data for " + rd, e);
         }
     }
@@ -452,19 +458,20 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
                 LOG.info("No DC gateways configured.");
                 return tunnelInterfaceNameList;
             }
-            List<DcGatewayIp> dcGatewayIps = dcGatewayIpListOptional.get().nonnullDcGatewayIp();
+            Map<DcGatewayIpKey, DcGatewayIp> keyDcGatewayIpMap = dcGatewayIpListOptional.get().nonnullDcGatewayIp();
             InstanceIdentifier<ExternalTunnelList> externalTunnelListId = InstanceIdentifier
                     .create(ExternalTunnelList.class);
             Optional<ExternalTunnelList> externalTunnelListOptional = SingleTransactionDataBroker.syncReadOptional(
                     dataBroker, LogicalDatastoreType.OPERATIONAL, externalTunnelListId);
             if (externalTunnelListOptional.isPresent()) {
-                List<ExternalTunnel> externalTunnels = externalTunnelListOptional.get().nonnullExternalTunnel();
+                Map<ExternalTunnelKey, ExternalTunnel> keyExternalTunnelMap
+                        = externalTunnelListOptional.get().nonnullExternalTunnel();
                 List<String> externalTunnelIpList = new ArrayList<>();
-                for (ExternalTunnel externalTunnel: externalTunnels) {
+                for (ExternalTunnel externalTunnel: keyExternalTunnelMap.values()) {
                     externalTunnelIpList.add(externalTunnel.getDestinationDevice());
                 }
                 List<String> dcGatewayIpList = new ArrayList<>();
-                for (DcGatewayIp dcGatewayIp: dcGatewayIps) {
+                for (DcGatewayIp dcGatewayIp: keyDcGatewayIpMap.values()) {
                     dcGatewayIpList.add(dcGatewayIp.getIpAddress().getIpv4Address().toString());
                 }
                 // Find all externalTunnelIps present in dcGateWayIpList
@@ -477,7 +484,7 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
                     }
                 }
                 for (String externalTunnelIpsInDcGatewayIp: externalTunnelIpsInDcGatewayIpList) {
-                    for (ExternalTunnel externalTunnel: externalTunnels) {
+                    for (ExternalTunnel externalTunnel: keyExternalTunnelMap.values()) {
                         if (externalTunnel.getDestinationDevice().contentEquals(externalTunnelIpsInDcGatewayIp)) {
                             tunnelInterfaceNameList.add(externalTunnel.getTunnelInterfaceName());
                         }
@@ -485,7 +492,7 @@ public class VpnInstanceListener extends AsyncDataTreeChangeListenerBase<VpnInst
                 }
 
             }
-        } catch (ReadFailedException e) {
+        } catch (InterruptedException | ExecutionException e) {
             LOG.error("getDcGatewayTunnelInterfaceNameList: Failed to read data store");
         }
         return tunnelInterfaceNameList;