Update MRI projects for Aluminium
[openflowplugin.git] / applications / forwardingrules-manager / src / main / java / org / opendaylight / openflowplugin / applications / frm / impl / FlowNodeReconciliationImpl.java
index 788199d2810cc4254c72d9dae3b81d553e611e27..9859e9cce40b263e68e66c978f67a074652b60f8 100644 (file)
@@ -1,24 +1,28 @@
-/**
+/*
  * Copyright (c) 2014, 2017 Cisco Systems, Inc. and others.  All rights reserved.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
  * and is available at http://www.eclipse.org/legal/epl-v10.html
  */
-
 package org.opendaylight.openflowplugin.applications.frm.impl;
 
-import com.google.common.base.Optional;
+import static org.opendaylight.openflowplugin.api.openflow.ReconciliationState.ReconciliationStatus.COMPLETED;
+import static org.opendaylight.openflowplugin.api.openflow.ReconciliationState.ReconciliationStatus.FAILED;
+import static org.opendaylight.openflowplugin.api.openflow.ReconciliationState.ReconciliationStatus.STARTED;
+
 import com.google.common.base.Preconditions;
-import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Lists;
-import com.google.common.util.concurrent.AsyncFunction;
-import com.google.common.util.concurrent.CheckedFuture;
+import com.google.common.util.concurrent.FluentFuture;
 import com.google.common.util.concurrent.FutureCallback;
 import com.google.common.util.concurrent.Futures;
 import com.google.common.util.concurrent.JdkFutureAdapters;
 import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.MoreExecutors;
+import com.google.common.util.concurrent.ThreadFactoryBuilder;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import java.math.BigInteger;
+import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -26,21 +30,27 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.ListIterator;
 import java.util.Map;
-import java.util.concurrent.Future;
+import java.util.Optional;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ExecutionException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicLong;
-import javax.annotation.Nullable;
-import org.opendaylight.controller.md.sal.binding.api.DataBroker;
-import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
-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.TransactionCommitFailedException;
+import org.opendaylight.mdsal.binding.api.DataBroker;
+import org.opendaylight.mdsal.binding.api.ReadTransaction;
+import org.opendaylight.mdsal.binding.api.WriteTransaction;
+import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
 import org.opendaylight.openflowplugin.api.OFConstants;
+import org.opendaylight.openflowplugin.api.openflow.FlowGroupCacheManager;
+import org.opendaylight.openflowplugin.api.openflow.ReconciliationState;
+import org.opendaylight.openflowplugin.api.openflow.device.DeviceInfo;
 import org.opendaylight.openflowplugin.applications.frm.FlowNodeReconciliation;
 import org.opendaylight.openflowplugin.applications.frm.ForwardingRulesManager;
+import org.opendaylight.openflowplugin.applications.frm.util.FrmUtil;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.action.GroupActionCase;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.action.OutputActionCase;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.list.Action;
@@ -59,6 +69,7 @@ import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.ta
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.StaleFlow;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.StaleFlowKey;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupId;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupTypes;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.group.Buckets;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.group.buckets.Bucket;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.groups.Group;
@@ -68,66 +79,83 @@ import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.group
 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.groups.StaleGroupKey;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeRef;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.Node;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.nodes.NodeKey;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.meter.types.rev130918.MeterId;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupTypes;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.AddBundleMessagesInput;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.AddBundleMessagesInputBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.AddBundleMessagesOutput;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.ControlBundleInput;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.ControlBundleInputBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.ControlBundleOutput;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.SalBundleService;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.add.bundle.messages.input.Messages;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.add.bundle.messages.input.MessagesBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.add.bundle.messages.input.messages.Message;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.add.bundle.messages.input.messages.MessageBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.bundle.inner.message.grouping.bundle.inner.message.BundleAddFlowCaseBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.bundle.inner.message.grouping.bundle.inner.message.BundleAddGroupCaseBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.bundle.inner.message.grouping.bundle.inner.message.BundleRemoveFlowCaseBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.bundle.inner.message.grouping.bundle.inner.message.BundleRemoveGroupCaseBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.bundle.inner.message.grouping.bundle.inner.message.bundle.add.flow._case.AddFlowCaseDataBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.bundle.inner.message.grouping.bundle.inner.message.bundle.add.group._case.AddGroupCaseDataBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.bundle.inner.message.grouping.bundle.inner.message.bundle.remove.flow._case.RemoveFlowCaseDataBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.bundle.service.rev170124.bundle.inner.message.grouping.bundle.inner.message.bundle.remove.group._case.RemoveGroupCaseDataBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.rev170124.BundleControlType;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.rev170124.BundleFlags;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.onf.rev170124.BundleId;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.table.features.TableFeaturesKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.openflowplugin.rf.state.rev170713.ResultState;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.table.features.TableFeatures;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.table.features.TableFeaturesKey;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
 import org.opendaylight.yangtools.yang.common.RpcResult;
+import org.opendaylight.yangtools.yang.common.Uint32;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * Default implementation of {@link ForwardingRulesManager}
+ * Default implementation of {@link ForwardingRulesManager}.
  *
  * @author <a href="mailto:vdemcak@cisco.com">Vaclav Demcak</a>
  */
 public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
-     private static final Logger LOG = LoggerFactory.getLogger(FlowNodeReconciliationImpl.class);
 
-    //The number of nanoseconds to wait for a single group to be added.
-    private static final long  ADD_GROUP_TIMEOUT = TimeUnit.SECONDS.toNanos(3);
+    private static final Logger LOG = LoggerFactory.getLogger(FlowNodeReconciliationImpl.class);
+    private static final Logger OF_EVENT_LOG = LoggerFactory.getLogger("OfEventLog");
+
+    // The number of nanoseconds to wait for a single group to be added.
+    private static final long ADD_GROUP_TIMEOUT = TimeUnit.SECONDS.toNanos(3);
 
-     //The maximum number of nanoseconds to wait for completion of add-group RPCs.
-    private static final long  MAX_ADD_GROUP_TIMEOUT = TimeUnit.SECONDS.toNanos(20);
+    // The maximum number of nanoseconds to wait for completion of add-group RPCs.
+    private static final long MAX_ADD_GROUP_TIMEOUT = TimeUnit.SECONDS.toNanos(20);
     private static final String SEPARATOR = ":";
     private static final int THREAD_POOL_SIZE = 4;
-
+    private static final ThreadFactory THREAD_FACTORY = new ThreadFactoryBuilder()
+            .setNameFormat("BundleResync-%d")
+            .setDaemon(false)
+            .setUncaughtExceptionHandler((thread, ex) -> LOG.error("Uncaught exception {}", thread, ex))
+            .build();
     private final DataBroker dataBroker;
     private final ForwardingRulesManager provider;
+    private final String serviceName;
+    private final int priority;
+    private final ResultState resultState;
+    private final Map<DeviceInfo, ListenableFuture<Boolean>> futureMap = new ConcurrentHashMap<>();
+
     private final ExecutorService executor = Executors.newFixedThreadPool(THREAD_POOL_SIZE);
 
     private final SalBundleService salBundleService;
 
     private static final AtomicLong BUNDLE_ID = new AtomicLong();
     private static final BundleFlags BUNDLE_FLAGS = new BundleFlags(true, true);
+    private Map<String, ReconciliationState> reconciliationStates;
 
-    public FlowNodeReconciliationImpl (final ForwardingRulesManager manager, final DataBroker db) {
+    public FlowNodeReconciliationImpl(final ForwardingRulesManager manager, final DataBroker db,
+                                      final String serviceName, final int priority, final ResultState resultState,
+                                      final FlowGroupCacheManager flowGroupCacheManager) {
         this.provider = Preconditions.checkNotNull(manager, "ForwardingRulesManager can not be null!");
         dataBroker = Preconditions.checkNotNull(db, "DataBroker can not be null!");
-        salBundleService = Preconditions.checkNotNull(manager.getSalBundleService(),"salBundleService can not be null!");
+        this.serviceName = serviceName;
+        this.priority = priority;
+        this.resultState = resultState;
+        salBundleService = Preconditions.checkNotNull(manager.getSalBundleService(),
+                "salBundleService can not be null!");
+        reconciliationStates = flowGroupCacheManager.getReconciliationStates();
     }
 
     @Override
@@ -138,167 +166,247 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
     }
 
     @Override
-    public void reconcileConfiguration(InstanceIdentifier<FlowCapableNode> connectedNode) {
-        if (provider.isReconciliationDisabled()) {
-            LOG.debug("Reconciliation is disabled by user. Skipping reconciliation of node : {}", connectedNode
-                    .firstKeyOf(Node.class));
-            return;
+    public ListenableFuture<Boolean> reconcileConfiguration(InstanceIdentifier<FlowCapableNode> connectedNode) {
+        LOG.info("Triggering reconciliation for device {}", connectedNode.firstKeyOf(Node.class));
+        // Clearing the group registry cache for the connected node if exists
+        String nodeId = FrmUtil.getNodeIdValueFromNodeIdentifier(connectedNode);
+        provider.getDevicesGroupRegistry().clearNodeGroups(nodeId);
+        if (provider.isStaleMarkingEnabled()) {
+            LOG.info("Stale-Marking is ENABLED and proceeding with deletion of " + "stale-marked entities on switch {}",
+                    connectedNode);
+            reconciliationPreProcess(connectedNode);
         }
-        if (provider.isNodeOwner(connectedNode)) {
-            LOG.info("Triggering reconciliation for device {}", connectedNode.firstKeyOf(Node.class));
-            if (provider.isStaleMarkingEnabled()) {
-                LOG.info("Stale-Marking is ENABLED and proceeding with deletion of stale-marked entities on switch {}",
-                        connectedNode.toString());
-                reconciliationPreProcess(connectedNode);
-            }
-            LOG.debug("Bundle based reconciliation status : {}", provider.isBundleBasedReconciliationEnabled()?"Enable":"Disable");
-            if (provider.isBundleBasedReconciliationEnabled()) {
-                BundleBasedReconciliationTask bundleBasedReconTask = new BundleBasedReconciliationTask(connectedNode);
-                executor.execute(bundleBasedReconTask);
-            } else {
-                ReconciliationTask reconciliationTask = new ReconciliationTask(connectedNode);
-                executor.execute(reconciliationTask);
-            }
+        if (provider.isBundleBasedReconciliationEnabled()) {
+            BundleBasedReconciliationTask bundleBasedReconTask = new BundleBasedReconciliationTask(connectedNode);
+            return JdkFutureAdapters.listenInPoolThread(executor.submit(bundleBasedReconTask));
+        } else {
+            ReconciliationTask reconciliationTask = new ReconciliationTask(connectedNode);
+            return JdkFutureAdapters.listenInPoolThread(executor.submit(reconciliationTask));
         }
     }
 
-    private class BundleBasedReconciliationTask implements Runnable {
+    @Override
+    public void flowNodeDisconnected(InstanceIdentifier<FlowCapableNode> disconnectedNode) {
+        String node = disconnectedNode.firstKeyOf(Node.class).getId().getValue();
+        BigInteger dpnId = getDpnIdFromNodeName(node);
+        reconciliationStates.remove(dpnId.toString());
+    }
+
+    private class BundleBasedReconciliationTask implements Callable<Boolean> {
         final InstanceIdentifier<FlowCapableNode> nodeIdentity;
 
-        public BundleBasedReconciliationTask(final InstanceIdentifier<FlowCapableNode> nodeIdent) {
+        BundleBasedReconciliationTask(final InstanceIdentifier<FlowCapableNode> nodeIdent) {
             nodeIdentity = nodeIdent;
         }
 
         @Override
-        public void run() {
-            String sNode = nodeIdentity.firstKeyOf(Node.class, NodeKey.class).getId().getValue();
-            Optional<FlowCapableNode> flowNode = Optional.absent();
+        public Boolean call() {
+            String node = nodeIdentity.firstKeyOf(Node.class).getId().getValue();
+            Optional<FlowCapableNode> flowNode = Optional.empty();
             BundleId bundleIdValue = new BundleId(BUNDLE_ID.getAndIncrement());
-            BigInteger nDpId = getDpnIdFromNodeName(sNode);
-            LOG.debug("Triggering bundle based reconciliation for device :{}", nDpId);
-            ReadOnlyTransaction trans = provider.getReadTranaction();
-            try {
+            BigInteger dpnId = getDpnIdFromNodeName(node);
+            ExecutorService service = Executors.newSingleThreadExecutor(THREAD_FACTORY);
+            LOG.info("Triggering bundle based reconciliation for device : {}", dpnId);
+            try (ReadTransaction trans = provider.getReadTransaction()) {
                 flowNode = trans.read(LogicalDatastoreType.CONFIGURATION, nodeIdentity).get();
-            } catch (Exception e) {
+            } catch (ExecutionException | InterruptedException e) {
                 LOG.error("Error occurred while reading the configuration data store for node {}", nodeIdentity, e);
             }
 
             if (flowNode.isPresent()) {
-                LOG.debug("FlowNode present for Datapath ID {}", nDpId);
+                ReconciliationState reconciliationState = new ReconciliationState(
+                        STARTED, LocalDateTime.now());
+                //put the dpn info into the map
+                reconciliationStates.put(dpnId.toString(), reconciliationState);
+                LOG.debug("FlowNode present for Datapath ID {}", dpnId);
+                OF_EVENT_LOG.debug("Bundle Reconciliation Start, Node: {}", dpnId);
                 final NodeRef nodeRef = new NodeRef(nodeIdentity.firstIdentifierOf(Node.class));
 
-                final ControlBundleInput openBundleInput = new ControlBundleInputBuilder()
-                        .setNode(nodeRef)
-                        .setBundleId(bundleIdValue)
-                        .setFlags(BUNDLE_FLAGS)
-                        .setType(BundleControlType.ONFBCTOPENREQUEST)
-                        .build();
-
-                final ControlBundleInput commitBundleInput = new ControlBundleInputBuilder()
-                        .setNode(nodeRef)
-                        .setBundleId(bundleIdValue)
-                        .setFlags(BUNDLE_FLAGS)
-                        .setType(BundleControlType.ONFBCTCOMMITREQUEST)
-                        .build();
-
-                final AddBundleMessagesInput addBundleMessagesInput = new AddBundleMessagesInputBuilder()
-                        .setNode(nodeRef)
-                        .setBundleId(bundleIdValue)
-                        .setFlags(BUNDLE_FLAGS)
-                        .setMessages(createMessages(nodeRef, flowNode))
-                        .build();
-
-                Future<RpcResult<Void>> openBundle = salBundleService.controlBundle(openBundleInput);
-
-                ListenableFuture<RpcResult<Void>> addBundleMessagesFuture =
-                        Futures.transformAsync(JdkFutureAdapters.listenInPoolThread(openBundle), rpcResult -> {
-                            if (rpcResult.isSuccessful()) {
-                                return JdkFutureAdapters.listenInPoolThread(
-                                        salBundleService.addBundleMessages(addBundleMessagesInput));
-                            }
-                            return Futures.immediateFuture(null);
-                        });
+                final ControlBundleInput closeBundleInput = new ControlBundleInputBuilder().setNode(nodeRef)
+                        .setBundleId(bundleIdValue).setFlags(BUNDLE_FLAGS)
+                        .setType(BundleControlType.ONFBCTCLOSEREQUEST).build();
+
+                final ControlBundleInput openBundleInput = new ControlBundleInputBuilder().setNode(nodeRef)
+                        .setBundleId(bundleIdValue).setFlags(BUNDLE_FLAGS)
+                        .setType(BundleControlType.ONFBCTOPENREQUEST).build();
+
+                final ControlBundleInput commitBundleInput = new ControlBundleInputBuilder().setNode(nodeRef)
+                        .setBundleId(bundleIdValue).setFlags(BUNDLE_FLAGS)
+                        .setType(BundleControlType.ONFBCTCOMMITREQUEST).build();
 
-                ListenableFuture<RpcResult<Void>> commitBundleFuture =
-                        Futures.transformAsync(addBundleMessagesFuture, rpcResult -> {
+                final AddBundleMessagesInput deleteAllFlowGroupsInput = new AddBundleMessagesInputBuilder()
+                        .setNode(nodeRef).setBundleId(bundleIdValue).setFlags(BUNDLE_FLAGS)
+                        .setMessages(createMessages(nodeRef)).build();
+
+                LOG.debug("Closing openflow bundle for device {}", dpnId);
+                /* Close previously opened bundle on the openflow switch if any */
+                ListenableFuture<RpcResult<ControlBundleOutput>> closeBundle
+                        = salBundleService.controlBundle(closeBundleInput);
+
+                /* Open a new bundle on the switch */
+                ListenableFuture<RpcResult<ControlBundleOutput>> openBundle =
+                        Futures.transformAsync(closeBundle,
+                            rpcResult -> salBundleService.controlBundle(openBundleInput),
+                                service);
+
+                    /* Push groups and flows via bundle add messages */
+                ListenableFuture<RpcResult<AddBundleMessagesOutput>> deleteAllFlowGroupsFuture
+                        = Futures.transformAsync(openBundle, rpcResult -> {
                             if (rpcResult.isSuccessful()) {
-                                return JdkFutureAdapters.listenInPoolThread(
-                                        salBundleService.controlBundle(commitBundleInput));
+                                return salBundleService.addBundleMessages(deleteAllFlowGroupsInput);
                             }
                             return Futures.immediateFuture(null);
-                        });
+                        }, service);
 
-                /* Bundles not supported for meters*/
-                List<Meter> meters = flowNode.get().getMeter() != null
-                        ? flowNode.get().getMeter() : Collections.emptyList();
-                ListenableFuture<RpcResult<Void>> meterFuture =
-                        Futures.transformAsync(commitBundleFuture, rpcResult -> {
+                /* Push flows and groups via bundle add messages */
+                Optional<FlowCapableNode> finalFlowNode = flowNode;
+                ListenableFuture<List<RpcResult<AddBundleMessagesOutput>>> addbundlesFuture
+                        = Futures.transformAsync(deleteAllFlowGroupsFuture, rpcResult -> {
                             if (rpcResult.isSuccessful()) {
-                                for (Meter meter : meters) {
-                                    final KeyedInstanceIdentifier<Meter, MeterKey> meterIdent =
-                                            nodeIdentity.child(Meter.class, meter.getKey());
-                                    provider.getMeterCommiter().add(meterIdent, meter, nodeIdentity);
-                                }
+                                LOG.debug("Adding delete all flow/group message is successful for device {}", dpnId);
+                                return Futures.allAsList(addBundleMessages(finalFlowNode.get(), bundleIdValue,
+                                        nodeIdentity));
                             }
                             return Futures.immediateFuture(null);
-                        });
-
-                LOG.debug("Completing bundle based reconciliation for device ID:{}", nDpId);
-                trans.close();
+                        }, service);
+
+                    /* Commit the bundle on the openflow switch */
+                ListenableFuture<RpcResult<ControlBundleOutput>> commitBundleFuture
+                        = Futures.transformAsync(addbundlesFuture, rpcResult -> {
+                            LOG.debug("Adding bundle messages completed for device {}", dpnId);
+                            return salBundleService.controlBundle(commitBundleInput);
+                        }, service);
+
+                /* Bundles not supported for meters */
+                Collection<Meter> meters = flowNode.get().nonnullMeter().values();
+                Futures.transformAsync(commitBundleFuture,
+                    rpcResult -> {
+                        if (rpcResult.isSuccessful()) {
+                            for (Meter meter : meters) {
+                                final KeyedInstanceIdentifier<Meter, MeterKey> meterIdent = nodeIdentity
+                                        .child(Meter.class, meter.key());
+                                provider.getMeterCommiter().add(meterIdent, meter, nodeIdentity);
+                            }
+                        }
+                        return Futures.immediateFuture(null);
+                    }, service);
+                try {
+                    RpcResult<ControlBundleOutput> bundleFuture = commitBundleFuture.get();
+                    if (bundleFuture != null && bundleFuture.isSuccessful()) {
+                        reconciliationState.setState(COMPLETED, LocalDateTime.now());
+                        LOG.debug("Completing bundle based reconciliation for device ID:{}", dpnId);
+                        OF_EVENT_LOG.debug("Bundle Reconciliation Finish, Node: {}", dpnId);
+                        return true;
+                    } else {
+                        reconciliationState.setState(FAILED, LocalDateTime.now());
+                        LOG.error("commit bundle failed for device {} with error {}", dpnId,
+                                commitBundleFuture.get().getErrors());
+                        return false;
+                    }
+                } catch (InterruptedException | ExecutionException e) {
+                    reconciliationState.setState(FAILED, LocalDateTime.now());
+                    LOG.error("commit bundle failed for device {} with error ", dpnId, e);
+                    return false;
+                } finally {
+                    service.shutdown();
+                }
             }
+            LOG.error("FlowNode not present for Datapath ID {}", dpnId);
+            return false;
         }
     }
 
-    private class ReconciliationTask implements Runnable {
+    @Override
+    public ListenableFuture<Boolean> startReconciliation(DeviceInfo node) {
+        InstanceIdentifier<FlowCapableNode> connectedNode = node.getNodeInstanceIdentifier()
+                .augmentation(FlowCapableNode.class);
+        // Clearing the group registry cache for the connected node if exists
+        provider.getDevicesGroupRegistry().clearNodeGroups(node.toString());
+        return futureMap.computeIfAbsent(node, future -> reconcileConfiguration(connectedNode));
+    }
+
+    @Override
+    public ListenableFuture<Boolean> endReconciliation(DeviceInfo node) {
+        ListenableFuture<Boolean> listenableFuture = futureMap.computeIfPresent(node, (key, future) -> future);
+        if (listenableFuture != null) {
+            listenableFuture.cancel(true);
+            futureMap.remove(node);
+        }
+        return Futures.immediateFuture(true);
+    }
+
+    @Override
+    public int getPriority() {
+        return priority;
+    }
+
+    @Override
+    public String getName() {
+        return serviceName;
+    }
+
+    @Override
+    public ResultState getResultState() {
+        return resultState;
+    }
+
+    private class ReconciliationTask implements Callable<Boolean> {
 
         InstanceIdentifier<FlowCapableNode> nodeIdentity;
 
-        public ReconciliationTask(final InstanceIdentifier<FlowCapableNode> nodeIdent) {
-           nodeIdentity = nodeIdent;
+        ReconciliationTask(final InstanceIdentifier<FlowCapableNode> nodeIdent) {
+            nodeIdentity = nodeIdent;
         }
 
         @Override
-        public void run() {
-            String sNode = nodeIdentity.firstKeyOf(Node.class, NodeKey.class).getId().getValue();
-            BigInteger nDpId = getDpnIdFromNodeName(sNode);
-
-            ReadOnlyTransaction trans = provider.getReadTranaction();
-            Optional<FlowCapableNode> flowNode = Optional.absent();
+        public Boolean call() {
+            String node = nodeIdentity.firstKeyOf(Node.class).getId().getValue();
+            BigInteger dpnId = getDpnIdFromNodeName(node);
+            OF_EVENT_LOG.debug("Reconciliation Start, Node: {}", dpnId);
 
-            //initialize the counter
+            Optional<FlowCapableNode> flowNode;
+            // initialize the counter
             int counter = 0;
-            try {
+            try (ReadTransaction trans = provider.getReadTransaction()) {
                 flowNode = trans.read(LogicalDatastoreType.CONFIGURATION, nodeIdentity).get();
-            } catch (Exception e) {
+            } catch (ExecutionException | InterruptedException e) {
                 LOG.warn("Fail with read Config/DS for Node {} !", nodeIdentity, e);
+                return false;
             }
 
             if (flowNode.isPresent()) {
-            /* Tables - have to be pushed before groups */
-                // CHECK if while pusing the update, updateTableInput can be null to emulate a table add
-                List<TableFeatures> tableList = flowNode.get().getTableFeatures() != null
-                        ? flowNode.get().getTableFeatures() : Collections.<TableFeatures>emptyList();
+                /* Tables - have to be pushed before groups */
+                // CHECK if while pushing the update, updateTableInput can be null to emulate a
+                // table add
+                ReconciliationState reconciliationState = new ReconciliationState(
+                        STARTED, LocalDateTime.now());
+                //put the dpn info into the map
+                reconciliationStates.put(dpnId.toString(), reconciliationState);
+                LOG.debug("Triggering reconciliation for node {} with state: {}", dpnId, STARTED);
+                Collection<TableFeatures> tableList = flowNode.get().nonnullTableFeatures().values();
                 for (TableFeatures tableFeaturesItem : tableList) {
-                    TableFeaturesKey tableKey = tableFeaturesItem.getKey();
-                    KeyedInstanceIdentifier<TableFeatures, TableFeaturesKey> tableFeaturesII
-                            = nodeIdentity.child(TableFeatures.class, new TableFeaturesKey(tableKey.getTableId()));
+                    TableFeaturesKey tableKey = tableFeaturesItem.key();
+                    KeyedInstanceIdentifier<TableFeatures, TableFeaturesKey> tableFeaturesII = nodeIdentity
+                            .child(TableFeatures.class, new TableFeaturesKey(tableKey.getTableId()));
                     provider.getTableFeaturesCommiter().update(tableFeaturesII, tableFeaturesItem, null, nodeIdentity);
                 }
 
-            /* Groups - have to be first */
-                List<Group> groups = flowNode.get().getGroup() != null
-                        ? flowNode.get().getGroup() : Collections.<Group>emptyList();
+                /* Groups - have to be first */
+                Collection<Group> groups = flowNode.get().nonnullGroup().values();
                 List<Group> toBeInstalledGroups = new ArrayList<>();
                 toBeInstalledGroups.addAll(groups);
-                //new list for suspected groups pointing to ports .. when the ports come up late
+                // new list for suspected groups pointing to ports .. when the ports come up
+                // late
                 List<Group> suspectedGroups = new ArrayList<>();
-                Map<Long, ListenableFuture<?>> groupFutures = new HashMap<>();
+                Map<Uint32, ListenableFuture<?>> groupFutures = new HashMap<>();
 
-                while ((!(toBeInstalledGroups.isEmpty()) || !(suspectedGroups.isEmpty())) &&
-                        (counter <= provider.getReconciliationRetryCount())) { //also check if the counter has not crossed the threshold
+                while ((!toBeInstalledGroups.isEmpty() || !suspectedGroups.isEmpty())
+                        && counter <= provider.getReconciliationRetryCount()) { // also check if the counter has not
+                                                                                // crossed the threshold
 
                     if (toBeInstalledGroups.isEmpty() && !suspectedGroups.isEmpty()) {
-                        LOG.debug("These Groups are pointing to node-connectors that are not up yet {}", suspectedGroups.toString());
+                        LOG.debug("These Groups are pointing to node-connectors that are not up yet {}",
+                                suspectedGroups);
                         toBeInstalledGroups.addAll(suspectedGroups);
                         break;
                     }
@@ -308,65 +416,63 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
                         Group group = iterator.next();
                         boolean okToInstall = true;
                         Buckets buckets = group.getBuckets();
-                        List<Bucket> bucketList = (buckets == null)
-                            ? null : buckets.getBucket();
+                        Collection<Bucket> bucketList = buckets == null ? null : buckets.nonnullBucket().values();
                         if (bucketList == null) {
                             bucketList = Collections.<Bucket>emptyList();
                         }
                         for (Bucket bucket : bucketList) {
-                            List<Action> actions = bucket.getAction();
+                            Collection<Action> actions = bucket.nonnullAction().values();
                             if (actions == null) {
                                 actions = Collections.<Action>emptyList();
                             }
                             for (Action action : actions) {
-                                //chained-port
-                                if (action.getAction().getImplementedInterface().getName()
-                                        .equals("org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.action.OutputActionCase")) {
-                                    String nodeConnectorUri = ((OutputActionCase) (action.getAction()))
-                                            .getOutputAction().getOutputNodeConnector().getValue();
+                                // chained-port
+                                if (action.getAction().implementedInterface().getName()
+                                        .equals("org.opendaylight.yang.gen.v1.urn.opendaylight"
+                                                + ".action.types.rev131112.action.action.OutputActionCase")) {
+                                    String nodeConnectorUri = ((OutputActionCase) action.getAction()).getOutputAction()
+                                            .getOutputNodeConnector().getValue();
 
                                     LOG.debug("Installing the group for node connector {}", nodeConnectorUri);
 
-                                    //check if the nodeconnector is there in the multimap
+                                    // check if the nodeconnector is there in the multimap
                                     boolean isPresent = provider.getFlowNodeConnectorInventoryTranslatorImpl()
-                                            .isNodeConnectorUpdated(nDpId, nodeConnectorUri);
-                                    //if yes set okToInstall = true
+                                            .isNodeConnectorUpdated(dpnId, nodeConnectorUri);
+                                    // if yes set okToInstall = true
 
                                     if (isPresent) {
                                         break;
-                                    }//else put it in a different list and still set okToInstall = true
-                                    else {
+                                    } else {
+                                        // else put it in a different list and still set okToInstall = true
                                         suspectedGroups.add(group);
-                                        LOG.debug("Not yet received the node-connector updated for {} " +
-                                                "for the group with id {}", nodeConnectorUri, group.getGroupId().toString());
+                                        LOG.debug(
+                                                "Not yet received the node-connector updated for {} "
+                                                        + "for the group with id {}",
+                                                nodeConnectorUri, group.getGroupId());
                                         break;
                                     }
-
-
-                                }
-                                //chained groups
-                                else if (action.getAction().getImplementedInterface().getName()
-                                        .equals("org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.action.GroupActionCase")) {
-                                    Long groupId = ((GroupActionCase) (action.getAction())).getGroupAction().getGroupId();
-                                    ListenableFuture<?> future =
-                                        groupFutures.get(groupId);
+                                } else if (action.getAction().implementedInterface().getName()
+                                        .equals("org.opendaylight.yang.gen.v1.urn.opendaylight"
+                                                + ".action.types.rev131112.action.action.GroupActionCase")) {
+                                    // chained groups
+                                    Uint32 groupId = ((GroupActionCase) action.getAction()).getGroupAction()
+                                            .getGroupId();
+                                    ListenableFuture<?> future = groupFutures.get(groupId);
                                     if (future == null) {
                                         okToInstall = false;
                                         break;
                                     }
-
                                     // Need to ensure that the group specified
                                     // by group-action is already installed.
-                                    awaitGroup(sNode, future);
+                                    awaitGroup(node, future);
                                 }
                             }
                             if (!okToInstall) {
-                                //increment retry counter value
+                                // increment retry counter value
                                 counter++;
                                 break;
                             }
                         }
-
                         if (okToInstall) {
                             addGroup(groupFutures, group);
                             iterator.remove();
@@ -376,79 +482,79 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
                     }
                 }
 
-            /* installation of suspected groups*/
+                /* installation of suspected groups */
                 if (!toBeInstalledGroups.isEmpty()) {
                     for (Group group : toBeInstalledGroups) {
-                        LOG.debug("Installing the group {} finally although the port is not up after checking for {} times "
-                                , group.getGroupId().toString(), provider.getReconciliationRetryCount());
+                        LOG.debug(
+                                "Installing the group {} finally although "
+                                        + "the port is not up after checking for {} times ",
+                                group.getGroupId(), provider.getReconciliationRetryCount());
                         addGroup(groupFutures, group);
                     }
                 }
-            /* Meters */
-                List<Meter> meters = flowNode.get().getMeter() != null
-                        ? flowNode.get().getMeter() : Collections.<Meter>emptyList();
+                /* Meters */
+                Collection<Meter> meters = flowNode.get().nonnullMeter().values();
                 for (Meter meter : meters) {
-                    final KeyedInstanceIdentifier<Meter, MeterKey> meterIdent =
-                            nodeIdentity.child(Meter.class, meter.getKey());
+                    final KeyedInstanceIdentifier<Meter, MeterKey> meterIdent = nodeIdentity.child(Meter.class,
+                            meter.key());
                     provider.getMeterCommiter().add(meterIdent, meter, nodeIdentity);
                 }
 
                 // Need to wait for all groups to be installed before adding
                 // flows.
-                awaitGroups(sNode, groupFutures.values());
+                awaitGroups(node, groupFutures.values());
 
-            /* Flows */
-                List<Table> tables = flowNode.get().getTable() != null
-                        ? flowNode.get().getTable() : Collections.<Table>emptyList();
+                /* Flows */
+                Collection<Table> tables = flowNode.get().getTable() != null ? flowNode.get().nonnullTable().values()
+                        : Collections.<Table>emptyList();
+                int flowCount = 0;
                 for (Table table : tables) {
-                    final KeyedInstanceIdentifier<Table, TableKey> tableIdent =
-                            nodeIdentity.child(Table.class, table.getKey());
-                    List<Flow> flows = table.getFlow() != null ? table.getFlow() : Collections.<Flow>emptyList();
+                    final KeyedInstanceIdentifier<Table, TableKey> tableIdent = nodeIdentity.child(Table.class,
+                            table.key());
+                    Collection<Flow> flows = table.nonnullFlow().values();
+                    flowCount += flows.size();
                     for (Flow flow : flows) {
-                        final KeyedInstanceIdentifier<Flow, FlowKey> flowIdent =
-                                tableIdent.child(Flow.class, flow.getKey());
+                        final KeyedInstanceIdentifier<Flow, FlowKey> flowIdent = tableIdent.child(Flow.class,
+                                flow.key());
                         provider.getFlowCommiter().add(flowIdent, flow, nodeIdentity);
                     }
                 }
+                reconciliationState.setState(COMPLETED, LocalDateTime.now());
+                OF_EVENT_LOG.debug("Reconciliation Finish, Node: {}, flow count: {}", dpnId, flowCount);
             }
-        /* clean transaction */
-            trans.close();
+            return true;
         }
 
         /**
-         * Invoke add-group RPC, and put listenable future associated with the
-         * RPC into the given map.
+         * Invoke add-group RPC, and put listenable future associated with the RPC into
+         * the given map.
          *
-         * @param map        The map to store listenable futures associated with
-         *                   add-group RPC.
-         * @param group      The group to add.
+         * @param map
+         *            The map to store listenable futures associated with add-group RPC.
+         * @param group
+         *            The group to add.
          */
-        private void addGroup(Map<Long, ListenableFuture<?>> map, Group group) {
-            KeyedInstanceIdentifier<Group, GroupKey> groupIdent =
-                nodeIdentity.child(Group.class, group.getKey());
-            final Long groupId = group.getGroupId().getValue();
-            ListenableFuture<?> future = JdkFutureAdapters.listenInPoolThread(
-                provider.getGroupCommiter().add(
-                    groupIdent, group, nodeIdentity));
+        private void addGroup(Map<Uint32, ListenableFuture<?>> map, Group group) {
+            KeyedInstanceIdentifier<Group, GroupKey> groupIdent = nodeIdentity.child(Group.class, group.key());
+            final Uint32 groupId = group.getGroupId().getValue();
+            ListenableFuture<?> future = JdkFutureAdapters
+                    .listenInPoolThread(provider.getGroupCommiter().add(groupIdent, group, nodeIdentity));
 
             Futures.addCallback(future, new FutureCallback<Object>() {
                 @Override
                 public void onSuccess(Object result) {
                     if (LOG.isTraceEnabled()) {
                         LOG.trace("add-group RPC completed: node={}, id={}",
-                                  nodeIdentity.firstKeyOf(Node.class).getId().
-                                  getValue(), groupId);
+                                nodeIdentity.firstKeyOf(Node.class).getId().getValue(), groupId);
                     }
                 }
 
                 @Override
                 public void onFailure(Throwable cause) {
-                    String msg = "add-group RPC failed: node=" +
-                        nodeIdentity.firstKeyOf(Node.class).getId().getValue() +
-                        ", id=" + groupId;
-                    LOG.debug(msg, cause);
+                    LOG.debug("add-group RPC failed: node={}, id={}",
+                            nodeIdentity.firstKeyOf(Node.class).getId().getValue(), groupId, cause);
                 }
-            });
+            }, MoreExecutors.directExecutor());
 
             map.put(groupId, future);
         }
@@ -456,9 +562,11 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
         /**
          * Wait for completion of add-group RPC.
          *
-         * @param nodeId  The identifier for the target node.
-         * @param future  Future associated with add-group RPC that installs
-         *                the target group.
+         * @param nodeId
+         *            The identifier for the target node.
+         * @param future
+         *            Future associated with add-group RPC that installs the target
+         *            group.
          */
         private void awaitGroup(String nodeId, ListenableFuture<?> future) {
             awaitGroups(nodeId, Collections.singleton(future));
@@ -467,30 +575,26 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
         /**
          * Wait for completion of add-group RPCs.
          *
-         * @param nodeId   The identifier for the target node.
-         * @param futures  A collection of futures associated with add-group
-         *                 RPCs.
+         * @param nodeId
+         *            The identifier for the target node.
+         * @param futures
+         *            A collection of futures associated with add-group RPCs.
          */
-        private void awaitGroups(String nodeId,
-                                 Collection<ListenableFuture<?>> futures) {
+        private void awaitGroups(String nodeId, Collection<ListenableFuture<?>> futures) {
             if (!futures.isEmpty()) {
-                long timeout = Math.min(
-                    ADD_GROUP_TIMEOUT * futures.size(), MAX_ADD_GROUP_TIMEOUT);
+                long timeout = Math.min(ADD_GROUP_TIMEOUT * futures.size(), MAX_ADD_GROUP_TIMEOUT);
                 try {
-                    Futures.successfulAsList(futures).
-                        get(timeout, TimeUnit.NANOSECONDS);
+                    Futures.successfulAsList(futures).get(timeout, TimeUnit.NANOSECONDS);
                     LOG.trace("awaitGroups() completed: node={}", nodeId);
-                } catch (TimeoutException e) {
-                    LOG.debug("add-group RPCs did not complete: node={}",
-                             nodeId);
-                } catch (Exception e) {
-                    LOG.debug("Unhandled exception while waiting for group installation on node {}",
-                              nodeId, e);
+                } catch (TimeoutException | InterruptedException | ExecutionException e) {
+                    LOG.debug("add-group RPCs did not complete: node={}", nodeId);
                 }
             }
         }
     }
 
+    @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
+            justification = "https://github.com/spotbugs/spotbugs/issues/811")
     private BigInteger getDpnIdFromNodeName(String nodeName) {
 
         String dpId = nodeName.substring(nodeName.lastIndexOf(SEPARATOR) + 1);
@@ -498,41 +602,35 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
     }
 
     private void reconciliationPreProcess(final InstanceIdentifier<FlowCapableNode> nodeIdent) {
-
         List<InstanceIdentifier<StaleFlow>> staleFlowsToBeBulkDeleted = Lists.newArrayList();
         List<InstanceIdentifier<StaleGroup>> staleGroupsToBeBulkDeleted = Lists.newArrayList();
         List<InstanceIdentifier<StaleMeter>> staleMetersToBeBulkDeleted = Lists.newArrayList();
 
+        Optional<FlowCapableNode> flowNode = Optional.empty();
 
-        ReadOnlyTransaction trans = provider.getReadTranaction();
-        Optional<FlowCapableNode> flowNode = Optional.absent();
-
-        try {
+        try (ReadTransaction trans = provider.getReadTransaction()) {
             flowNode = trans.read(LogicalDatastoreType.CONFIGURATION, nodeIdent).get();
-        }
-        catch (Exception e) {
+        } catch (ExecutionException | InterruptedException e) {
             LOG.warn("Reconciliation Pre-Processing Fail with read Config/DS for Node {} !", nodeIdent, e);
         }
 
         if (flowNode.isPresent()) {
 
             LOG.debug("Proceeding with deletion of stale-marked Flows on switch {} using Openflow interface",
-                    nodeIdent.toString());
+                    nodeIdent);
             /* Stale-Flows - Stale-marked Flows have to be removed first for safety */
-            List<Table> tables = flowNode.get().getTable() != null
-                    ? flowNode.get().getTable() : Collections.<Table> emptyList();
+            Collection<Table> tables = flowNode.get().nonnullTable().values();
             for (Table table : tables) {
-                final KeyedInstanceIdentifier<Table, TableKey> tableIdent =
-                        nodeIdent.child(Table.class, table.getKey());
-                List<StaleFlow> staleFlows = table.getStaleFlow() != null ? table.getStaleFlow() : Collections.<StaleFlow> emptyList();
+                final KeyedInstanceIdentifier<Table, TableKey> tableIdent = nodeIdent.child(Table.class,
+                        table.key());
+                Collection<StaleFlow> staleFlows = table.nonnullStaleFlow().values();
                 for (StaleFlow staleFlow : staleFlows) {
 
                     FlowBuilder flowBuilder = new FlowBuilder(staleFlow);
                     Flow toBeDeletedFlow = flowBuilder.setId(staleFlow.getId()).build();
 
-                    final KeyedInstanceIdentifier<Flow, FlowKey> flowIdent =
-                            tableIdent.child(Flow.class, toBeDeletedFlow.getKey());
-
+                    final KeyedInstanceIdentifier<Flow, FlowKey> flowIdent = tableIdent.child(Flow.class,
+                            toBeDeletedFlow.key());
 
                     this.provider.getFlowCommiter().remove(flowIdent, toBeDeletedFlow, nodeIdent);
 
@@ -540,23 +638,22 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
                 }
             }
 
-
             LOG.debug("Proceeding with deletion of stale-marked Groups for switch {} using Openflow interface",
-                    nodeIdent.toString());
+                    nodeIdent);
 
-            // TODO: Should we collate the futures of RPC-calls to be sure that groups are Flows are fully deleted
+            // TODO: Should we collate the futures of RPC-calls to be sure that groups are
+            // Flows are fully deleted
             // before attempting to delete groups - just in case there are references
 
             /* Stale-marked Groups - Can be deleted after flows */
-            List<StaleGroup> staleGroups = flowNode.get().getStaleGroup() != null
-                    ? flowNode.get().getStaleGroup() : Collections.<StaleGroup> emptyList();
+            Collection<StaleGroup> staleGroups = flowNode.get().nonnullStaleGroup().values();
             for (StaleGroup staleGroup : staleGroups) {
 
                 GroupBuilder groupBuilder = new GroupBuilder(staleGroup);
                 Group toBeDeletedGroup = groupBuilder.setGroupId(staleGroup.getGroupId()).build();
 
-                final KeyedInstanceIdentifier<Group, GroupKey> groupIdent =
-                        nodeIdent.child(Group.class, toBeDeletedGroup.getKey());
+                final KeyedInstanceIdentifier<Group, GroupKey> groupIdent = nodeIdent.child(Group.class,
+                        toBeDeletedGroup.key());
 
                 this.provider.getGroupCommiter().remove(groupIdent, toBeDeletedGroup, nodeIdent);
 
@@ -564,19 +661,17 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
             }
 
             LOG.debug("Proceeding with deletion of stale-marked Meters for switch {} using Openflow interface",
-                    nodeIdent.toString());
+                    nodeIdent);
             /* Stale-marked Meters - can be deleted anytime - so least priority */
-            List<StaleMeter> staleMeters = flowNode.get().getStaleMeter() != null
-                    ? flowNode.get().getStaleMeter() : Collections.<StaleMeter> emptyList();
+            Collection<StaleMeter> staleMeters = flowNode.get().getStaleMeter().values();
 
             for (StaleMeter staleMeter : staleMeters) {
 
                 MeterBuilder meterBuilder = new MeterBuilder(staleMeter);
                 Meter toBeDeletedMeter = meterBuilder.setMeterId(staleMeter.getMeterId()).build();
 
-                final KeyedInstanceIdentifier<Meter, MeterKey> meterIdent =
-                        nodeIdent.child(Meter.class, toBeDeletedMeter.getKey());
-
+                final KeyedInstanceIdentifier<Meter, MeterKey> meterIdent = nodeIdent.child(Meter.class,
+                        toBeDeletedMeter.key());
 
                 this.provider.getMeterCommiter().remove(meterIdent, toBeDeletedMeter, nodeIdent);
 
@@ -584,138 +679,130 @@ public class FlowNodeReconciliationImpl implements FlowNodeReconciliation {
             }
 
         }
-        /* clean transaction */
-        trans.close();
 
         LOG.debug("Deleting all stale-marked flows/groups/meters of for switch {} in Configuration DS",
-                nodeIdent.toString());
-                // Now, do the bulk deletions
-                deleteDSStaleFlows(staleFlowsToBeBulkDeleted);
+                nodeIdent);
+        // Now, do the bulk deletions
+        deleteDSStaleFlows(staleFlowsToBeBulkDeleted);
         deleteDSStaleGroups(staleGroupsToBeBulkDeleted);
         deleteDSStaleMeters(staleMetersToBeBulkDeleted);
-
     }
 
-
-    private void deleteDSStaleFlows(List<InstanceIdentifier<StaleFlow>> flowsForBulkDelete){
-        ImmutableList.Builder<InstanceIdentifier<StaleFlow>> builder = ImmutableList.builder();
-
+    private void deleteDSStaleFlows(List<InstanceIdentifier<StaleFlow>> flowsForBulkDelete) {
         WriteTransaction writeTransaction = dataBroker.newWriteOnlyTransaction();
 
-        for (InstanceIdentifier<StaleFlow> staleFlowIId : flowsForBulkDelete){
+        for (InstanceIdentifier<StaleFlow> staleFlowIId : flowsForBulkDelete) {
             writeTransaction.delete(LogicalDatastoreType.CONFIGURATION, staleFlowIId);
         }
 
-        CheckedFuture<Void, TransactionCommitFailedException> submitFuture = writeTransaction.submit();
+        FluentFuture<?> submitFuture = writeTransaction.commit();
         handleStaleEntityDeletionResultFuture(submitFuture);
     }
 
-    private void deleteDSStaleGroups(List<InstanceIdentifier<StaleGroup>> groupsForBulkDelete){
-        ImmutableList.Builder<InstanceIdentifier<StaleGroup>> builder = ImmutableList.builder();
-
+    private void deleteDSStaleGroups(List<InstanceIdentifier<StaleGroup>> groupsForBulkDelete) {
         WriteTransaction writeTransaction = dataBroker.newWriteOnlyTransaction();
 
-        for (InstanceIdentifier<StaleGroup> staleGroupIId : groupsForBulkDelete){
+        for (InstanceIdentifier<StaleGroup> staleGroupIId : groupsForBulkDelete) {
             writeTransaction.delete(LogicalDatastoreType.CONFIGURATION, staleGroupIId);
         }
 
-        CheckedFuture<Void, TransactionCommitFailedException> submitFuture = writeTransaction.submit();
+        FluentFuture<?> submitFuture = writeTransaction.commit();
         handleStaleEntityDeletionResultFuture(submitFuture);
-
     }
 
-    private void deleteDSStaleMeters(List<InstanceIdentifier<StaleMeter>> metersForBulkDelete){
-        ImmutableList.Builder<InstanceIdentifier<StaleMeter>> builder = ImmutableList.builder();
-
+    private void deleteDSStaleMeters(List<InstanceIdentifier<StaleMeter>> metersForBulkDelete) {
         WriteTransaction writeTransaction = dataBroker.newWriteOnlyTransaction();
 
-        for (InstanceIdentifier<StaleMeter> staleMeterIId : metersForBulkDelete){
+        for (InstanceIdentifier<StaleMeter> staleMeterIId : metersForBulkDelete) {
             writeTransaction.delete(LogicalDatastoreType.CONFIGURATION, staleMeterIId);
         }
 
-        CheckedFuture<Void, TransactionCommitFailedException> submitFuture = writeTransaction.submit();
+        FluentFuture<?> submitFuture = writeTransaction.commit();
         handleStaleEntityDeletionResultFuture(submitFuture);
-
-
     }
 
+    private InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight
+        .flow.inventory.rev130819.tables.table.StaleFlow> getStaleFlowInstanceIdentifier(
+            StaleFlow staleFlow, InstanceIdentifier<FlowCapableNode> nodeIdent) {
+        return nodeIdent.child(Table.class, new TableKey(staleFlow.getTableId())).child(
+                org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.StaleFlow.class,
+                new StaleFlowKey(new FlowId(staleFlow.getId())));
+    }
 
-    private InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.StaleFlow> getStaleFlowInstanceIdentifier(StaleFlow staleFlow, InstanceIdentifier<FlowCapableNode> nodeIdent) {
-        return nodeIdent
-                .child(Table.class, new TableKey(staleFlow.getTableId()))
-                .child(org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.StaleFlow.class,
-                        new StaleFlowKey(new FlowId(staleFlow.getId())));
+    private InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight
+        .group.types.rev131018.groups.StaleGroup> getStaleGroupInstanceIdentifier(
+            StaleGroup staleGroup, InstanceIdentifier<FlowCapableNode> nodeIdent) {
+        return nodeIdent.child(StaleGroup.class, new StaleGroupKey(new GroupId(staleGroup.getGroupId())));
     }
 
-    private InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.groups.StaleGroup> getStaleGroupInstanceIdentifier(StaleGroup staleGroup, InstanceIdentifier<FlowCapableNode> nodeIdent) {
-        return nodeIdent
-                .child(StaleGroup.class, new StaleGroupKey(new GroupId(staleGroup.getGroupId())));
+    private InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight
+        .flow.inventory.rev130819.meters.StaleMeter> getStaleMeterInstanceIdentifier(
+            StaleMeter staleMeter, InstanceIdentifier<FlowCapableNode> nodeIdent) {
+        return nodeIdent.child(StaleMeter.class, new StaleMeterKey(new MeterId(staleMeter.getMeterId())));
     }
 
+    @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
+            justification = "https://github.com/spotbugs/spotbugs/issues/811")
+    private List<ListenableFuture<RpcResult<AddBundleMessagesOutput>>> addBundleMessages(final FlowCapableNode flowNode,
+                                                         final BundleId bundleIdValue,
+                                                         final InstanceIdentifier<FlowCapableNode> nodeIdentity) {
+        List<ListenableFuture<RpcResult<AddBundleMessagesOutput>>> futureList = new ArrayList<>();
+        for (Group group : flowNode.nonnullGroup().values()) {
+            final KeyedInstanceIdentifier<Group, GroupKey> groupIdent = nodeIdentity.child(Group.class, group.key());
+            futureList.add(provider.getBundleGroupListener().add(groupIdent, group, nodeIdentity, bundleIdValue));
+        }
 
-    private InstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.meters.StaleMeter> getStaleMeterInstanceIdentifier(StaleMeter staleMeter, InstanceIdentifier<FlowCapableNode> nodeIdent) {
-        return nodeIdent
-                .child(StaleMeter.class, new StaleMeterKey(new MeterId(staleMeter.getMeterId())));
+        for (Table table : flowNode.nonnullTable().values()) {
+            final KeyedInstanceIdentifier<Table, TableKey> tableIdent = nodeIdentity.child(Table.class, table.key());
+            for (Flow flow : table.nonnullFlow().values()) {
+                final KeyedInstanceIdentifier<Flow, FlowKey> flowIdent = tableIdent.child(Flow.class, flow.key());
+                futureList.add(provider.getBundleFlowListener().add(flowIdent, flow, nodeIdentity, bundleIdValue));
+            }
+        }
+        OF_EVENT_LOG.debug("Flow/Group count is {}", futureList.size());
+        return futureList;
     }
 
-
-    private void handleStaleEntityDeletionResultFuture(CheckedFuture<Void, TransactionCommitFailedException> submitFuture) {
-        Futures.addCallback(submitFuture, new FutureCallback<Void>() {
+    private void handleStaleEntityDeletionResultFuture(FluentFuture<?> submitFuture) {
+        submitFuture.addCallback(new FutureCallback<Object>() {
             @Override
-            public void onSuccess(Void result) {
+            public void onSuccess(Object result) {
                 LOG.debug("Stale entity removal success");
             }
 
             @Override
-            public void onFailure(Throwable t) {
-                LOG.debug("Stale entity removal failed {}", t);
+            public void onFailure(Throwable throwable) {
+                LOG.debug("Stale entity removal failed", throwable);
             }
-        });
+        }, MoreExecutors.directExecutor());
     }
 
-    private Flow getDeleteAllFlow(){
+    private Flow getDeleteAllFlow() {
         final FlowBuilder flowBuilder = new FlowBuilder();
         flowBuilder.setTableId(OFConstants.OFPTT_ALL);
         return flowBuilder.build();
     }
 
-    private Group getDeleteAllGroup(){
+    private Group getDeleteAllGroup() {
         final GroupBuilder groupBuilder = new GroupBuilder();
         groupBuilder.setGroupType(GroupTypes.GroupAll);
         groupBuilder.setGroupId(new GroupId(OFConstants.OFPG_ALL));
         return groupBuilder.build();
     }
 
-    private Messages createMessages(final NodeRef nodeRef , final Optional<FlowCapableNode> flowNode) {
-        final List<Message> messages  = new ArrayList<>();
-        messages.add(new MessageBuilder().setNode(nodeRef).setBundleInnerMessage(
-                new BundleRemoveFlowCaseBuilder()
-                        .setRemoveFlowCaseData(new RemoveFlowCaseDataBuilder(getDeleteAllFlow()).build()).build()).build());
-
-        messages.add(new MessageBuilder().setNode(nodeRef).setBundleInnerMessage(
-                new BundleRemoveGroupCaseBuilder()
-                        .setRemoveGroupCaseData(new RemoveGroupCaseDataBuilder(getDeleteAllGroup()).build()).build()).build());
-
-        if(flowNode.get().getGroup()!= null) {
-            for (Group gr : flowNode.get().getGroup()) {
-                messages.add(new MessageBuilder().setNode(nodeRef).setBundleInnerMessage(
-                        new BundleAddGroupCaseBuilder()
-                                .setAddGroupCaseData(new AddGroupCaseDataBuilder(gr).build()).build()).build());
-            }
-        }
-
-        if(flowNode.get().getTable()!= null) {
-            for (Table table : flowNode.get().getTable()) {
-                for (Flow flow : table.getFlow()) {
-                    messages.add(new MessageBuilder().setNode(nodeRef).setBundleInnerMessage(
-                            new BundleAddFlowCaseBuilder()
-                                    .setAddFlowCaseData(new AddFlowCaseDataBuilder(flow).build()).build()).build());
-                }
-            }
-        }
-
-        LOG.debug("The size of the flows and group messages created in createMessage() {}", messages.size());
+    @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
+            justification = "https://github.com/spotbugs/spotbugs/issues/811")
+    private Messages createMessages(final NodeRef nodeRef) {
+        final List<Message> messages = new ArrayList<>();
+        messages.add(new MessageBuilder().setNode(nodeRef)
+                .setBundleInnerMessage(new BundleRemoveFlowCaseBuilder()
+                        .setRemoveFlowCaseData(new RemoveFlowCaseDataBuilder(getDeleteAllFlow()).build()).build())
+                .build());
+
+        messages.add(new MessageBuilder().setNode(nodeRef)
+                .setBundleInnerMessage(new BundleRemoveGroupCaseBuilder()
+                        .setRemoveGroupCaseData(new RemoveGroupCaseDataBuilder(getDeleteAllGroup()).build()).build())
+                .build());
         return new MessagesBuilder().setMessage(messages).build();
     }
 }
-