Fixed add/delete/modify RPC for group/flow/remove reach the test provider
[controller.git] / opendaylight / md-sal / forwardingrules-manager / src / main / java / org / opendaylight / controller / forwardingrulesmanager / consumer / impl / FlowConsumerImpl.java
index 2ffe0ecd87eee775b08f6e5b51c1e0febcb66baf..d2f2420a7cb58814444de25af8944e57f2e80abb 100644 (file)
 package org.opendaylight.controller.forwardingrulesmanager.consumer.impl;
 
 import java.util.ArrayList;
-import java.util.EnumSet;
-import java.util.HashMap;
+import java.util.Collections;
+import java.util.HashSet;
 import java.util.List;
-import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Set;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.Future;
-
-import org.opendaylight.controller.clustering.services.CacheConfigException;
-import org.opendaylight.controller.clustering.services.CacheExistException;
-import org.opendaylight.controller.clustering.services.IClusterContainerServices;
-import org.opendaylight.controller.clustering.services.IClusterServices;
+
 import org.opendaylight.controller.md.sal.common.api.data.DataCommitHandler;
 import org.opendaylight.controller.md.sal.common.api.data.DataCommitHandler.DataCommitTransaction;
 import org.opendaylight.controller.md.sal.common.api.data.DataModification;
 import org.opendaylight.controller.sal.common.util.Rpcs;
-import org.opendaylight.controller.sal.core.IContainer;
-import org.opendaylight.controller.sal.utils.GlobalConstants;
-import org.opendaylight.controller.sal.utils.ServiceHelper;
-import org.opendaylight.controller.sal.utils.Status;
-import org.opendaylight.controller.sal.utils.StatusCode;
-import org.opendaylight.controller.switchmanager.ISwitchManager;
-import org.opendaylight.controller.switchmanager.Switch;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.config.rev130819.Flows;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.config.rev130819.flows.Flow;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.config.rev130819.flows.FlowKey;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.AddFlowInput;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.AddFlowInputBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.AddFlowOutput;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.FlowAdded;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.FlowRemoved;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.FlowTableRef;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.FlowUpdated;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.NodeErrorNotification;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.NodeExperimenterErrorNotification;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.NodeFlow;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.RemoveFlowInputBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.SalFlowListener;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.SalFlowService;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.SwitchFlowRemoved;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.UpdateFlowInputBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.flow.update.OriginalFlowBuilder;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.service.rev130819.flow.update.UpdatedFlowBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.list.Instruction;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeId;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.NodeRef;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.inventory.rev130819.Nodes;
-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.table.config.rev131024.Tables;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.table.config.rev131024.tables.Table;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.table.config.rev131024.tables.TableBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.table.config.rev131024.tables.TableKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.table.types.rev131026.TableRef;
 import org.opendaylight.yangtools.concepts.Registration;
 import org.opendaylight.yangtools.yang.binding.DataObject;
 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
 import org.opendaylight.yangtools.yang.binding.NotificationListener;
+import org.opendaylight.yangtools.yang.common.RpcError;
 import org.opendaylight.yangtools.yang.common.RpcResult;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-public class FlowConsumerImpl implements IForwardingRulesManager {
+public class FlowConsumerImpl {
     protected static final Logger logger = LoggerFactory.getLogger(FlowConsumerImpl.class);
     private final FlowEventListener flowEventListener = new FlowEventListener();
     private Registration<NotificationListener> listener1Reg;
     private SalFlowService flowService;
     // private FlowDataListener listener;
-    private FlowDataCommitHandler commitHandler;
-    private static ConcurrentHashMap<FlowKey, Flow> originalSwView;
-    private static ConcurrentMap<FlowKey, Flow> installedSwView;
-    private IClusterContainerServices clusterContainerService = null;
-    private IContainer container;
-    private static final String NAMEREGEX = "^[a-zA-Z0-9]+$";
-    private static ConcurrentMap<Integer, Flow> staticFlows;
-    private static ConcurrentMap<Integer, Integer> staticFlowsOrdinal = new ConcurrentHashMap<Integer, Integer>();
-    /*
-     * Inactive flow list. This is for the global instance of FRM It will
-     * contain all the flow entries which were installed on the global container
-     * when the first container is created.
-     */
-    private static ConcurrentMap<FlowKey, Flow> inactiveFlows;
-
-    /*
-     * /* Per node indexing
-     */
-    private static ConcurrentMap<Node, List<Flow>> nodeFlows;
-    private boolean inContainerMode; // being used by global instance only
+    private FlowDataCommitHandler commitHandler;    
 
     public FlowConsumerImpl() {
-        InstanceIdentifier<? extends DataObject> path = InstanceIdentifier.builder(Flows.class).child(Flow.class)
-                .toInstance();
+        InstanceIdentifier<? extends DataObject> path = InstanceIdentifier.builder(Flows.class).toInstance();
         flowService = FRMConsumerImpl.getProviderSession().getRpcService(SalFlowService.class);
 
         if (null == flowService) {
             logger.error("Consumer SAL Service is down or NULL. FRM may not function as intended");
-            System.out.println("Consumer SAL Service is down or NULL.");
             return;
         }
-
-        // listener = new FlowDataListener();
-
-        // if (null ==
-        // FRMConsumerImpl.getDataBrokerService().registerDataChangeListener(path,
-        // listener)) {
-        // logger.error("Failed to listen on flow data modifcation events");
-        // System.out.println("Consumer SAL Service is down or NULL.");
-        // return;
-        // }
-
+        
         // For switch events
         listener1Reg = FRMConsumerImpl.getNotificationService().registerNotificationListener(flowEventListener);
 
         if (null == listener1Reg) {
             logger.error("Listener to listen on flow data modifcation events");
-            System.out.println("Consumer SAL Service is down or NULL.");
             return;
         }
         // addFlowTest();
-        System.out.println("-------------------------------------------------------------------");
-        allocateCaches();
         commitHandler = new FlowDataCommitHandler();
-        FRMConsumerImpl.getDataProviderService().registerCommitHandler(path, commitHandler);
-        clusterContainerService = (IClusterContainerServices) ServiceHelper.getGlobalInstance(
-                IClusterContainerServices.class, this);
-        container = (IContainer) ServiceHelper.getGlobalInstance(IContainer.class, this);
-        /*
-         * If we are not the first cluster node to come up, do not initialize
-         * the static flow entries ordinal
-         */
-        if (staticFlowsOrdinal.size() == 0) {
-            staticFlowsOrdinal.put(0, Integer.valueOf(0));
-        }
+        FRMConsumerImpl.getDataProviderService().registerCommitHandler(path, commitHandler);        
     }
-
-    private void allocateCaches() {
-
-        if (this.clusterContainerService == null) {
-            logger.warn("Un-initialized clusterContainerService, can't create cache");
-            return;
-        }
-
-        try {
-            clusterContainerService.createCache("frm.originalSwView",
-                    EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
-            clusterContainerService.createCache("frm.installedSwView",
-                    EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
-            clusterContainerService
-                    .createCache("frm.staticFlows", EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
-            clusterContainerService.createCache("frm.staticFlowsOrdinal",
-                    EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
-            clusterContainerService.createCache("frm.inactiveFlows",
-                    EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
-            clusterContainerService.createCache("frm.nodeFlows", EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
-            clusterContainerService.createCache("frm.groupFlows", EnumSet.of(IClusterServices.cacheMode.TRANSACTIONAL));
-        } catch (CacheConfigException cce) {
-            logger.error("CacheConfigException");
-        } catch (CacheExistException cce) {
-            logger.error("CacheExistException");
-        }
-    }
-
-    private void addFlowTest() {
-        try {
-            NodeRef nodeOne = createNodeRef("foo:node:1");
-            AddFlowInputBuilder input1 = new AddFlowInputBuilder();
-
-            input1.setNode(nodeOne);
-            AddFlowInput firstMsg = input1.build();
-
-            if (null != flowService) {
-                System.out.println(flowService.toString());
-            } else {
-                System.out.println("ConsumerFlowService is NULL");
-            }
-            @SuppressWarnings("unused")
-            Future<RpcResult<AddFlowOutput>> result1 = flowService.addFlow(firstMsg);
-
-        } catch (Exception e) {
-            // TODO Auto-generated catch block
-            e.printStackTrace();
-        }
-    }
-
+    
     /**
      * Adds flow to the southbound plugin and our internal database
      *
@@ -189,28 +80,11 @@ public class FlowConsumerImpl implements IForwardingRulesManager {
     private void addFlow(InstanceIdentifier<?> path, Flow dataObject) {
 
         AddFlowInputBuilder input = new AddFlowInputBuilder();
-        List<Instruction> inst = (dataObject).getInstructions().getInstruction();
+        input.fieldsFrom(dataObject);
         input.setNode((dataObject).getNode());
-        input.setPriority((dataObject).getPriority());
-        input.setMatch((dataObject).getMatch());
-        input.setCookie((dataObject).getCookie());
-        input.setInstructions((dataObject).getInstructions());
-        dataObject.getMatch().getLayer3Match();
-        for (int i = 0; i < inst.size(); i++) {
-            System.out.println("i = " + i + inst.get(i).getInstruction().toString());
-            System.out.println("i = " + i + inst.get(i).toString());
-        }
-
-        System.out.println("Instruction list" + (dataObject).getInstructions().getInstruction().toString());
-
-        // updating the staticflow cache
-        Integer ordinal = staticFlowsOrdinal.get(0);
-        staticFlowsOrdinal.put(0, ++ordinal);
-        staticFlows.put(ordinal, dataObject);
-
+        input.setFlowTable(new FlowTableRef(createTableInstance(dataObject.getId(), dataObject.getNode())));
         // We send flow to the sounthbound plugin
         flowService.addFlow(input.build());
-        updateLocalDatabase((NodeFlow) dataObject, true);
     }
 
     /**
@@ -220,30 +94,14 @@ public class FlowConsumerImpl implements IForwardingRulesManager {
      * @param dataObject
      */
     private void removeFlow(InstanceIdentifier<?> path, Flow dataObject) {
-
+        
         RemoveFlowInputBuilder input = new RemoveFlowInputBuilder();
-        List<Instruction> inst = (dataObject).getInstructions().getInstruction();
+        input.fieldsFrom(dataObject);
         input.setNode((dataObject).getNode());
-        input.setPriority((dataObject).getPriority());
-        input.setMatch((dataObject).getMatch());
-        input.setCookie((dataObject).getCookie());
-        input.setInstructions((dataObject).getInstructions());
-        dataObject.getMatch().getLayer3Match();
-        for (int i = 0; i < inst.size(); i++) {
-            System.out.println("i = " + i + inst.get(i).getInstruction().toString());
-            System.out.println("i = " + i + inst.get(i).toString());
-        }
-
-        System.out.println("Instruction list" + (dataObject).getInstructions().getInstruction().toString());
-
-        // updating the staticflow cache
-        Integer ordinal = staticFlowsOrdinal.get(0);
-        staticFlowsOrdinal.put(0, ++ordinal);
-        staticFlows.put(ordinal, dataObject);
-
+        input.setTableId(dataObject.getTableId());
+        input.setFlowTable(new FlowTableRef(createTableInstance((long)dataObject.getTableId(), (dataObject).getNode())));
         // We send flow to the sounthbound plugin
         flowService.removeFlow(input.build());
-        updateLocalDatabase((NodeFlow) dataObject, false);
     }
 
     /**
@@ -252,49 +110,82 @@ public class FlowConsumerImpl implements IForwardingRulesManager {
      * @param path
      * @param dataObject
      */
-    private void updateFlow(InstanceIdentifier<?> path, Flow dataObject) {
+    private void updateFlow(InstanceIdentifier<?> path, Flow updatedFlow, Flow originalFlow) {
 
         UpdateFlowInputBuilder input = new UpdateFlowInputBuilder();
         UpdatedFlowBuilder updatedflowbuilder = new UpdatedFlowBuilder();
-        updatedflowbuilder.fieldsFrom(dataObject);
-        input.setUpdatedFlow(updatedflowbuilder.build());
-
-        // updating the staticflow cache
-        Integer ordinal = staticFlowsOrdinal.get(0);
-        staticFlowsOrdinal.put(0, ++ordinal);
-        staticFlows.put(ordinal, dataObject);
-
+        updatedflowbuilder.fieldsFrom(updatedFlow);
+        input.setNode(updatedFlow.getNode());
+        input.setUpdatedFlow(updatedflowbuilder.build());  
+        OriginalFlowBuilder ofb = new OriginalFlowBuilder(originalFlow);
+        input.setOriginalFlow(ofb.build());
         // We send flow to the sounthbound plugin
         flowService.updateFlow(input.build());
-        updateLocalDatabase((NodeFlow) dataObject, true);
     }
-
-    @SuppressWarnings("unchecked")
     private void commitToPlugin(internalTransaction transaction) {
-        for (Entry<InstanceIdentifier<?>, Flow> entry : transaction.additions.entrySet()) {
-            System.out.println("Coming add cc in FlowDatacommitHandler");
-            addFlow(entry.getKey(), entry.getValue());
+        Set<Entry<InstanceIdentifier<?>, DataObject>> createdEntries = transaction.getModification()
+                .getCreatedConfigurationData().entrySet();
+
+        /*
+         * This little dance is because updatedEntries contains both created and
+         * modified entries The reason I created a new HashSet is because the
+         * collections we are returned are immutable.
+         */
+        Set<Entry<InstanceIdentifier<?>, DataObject>> updatedEntries = new HashSet<Entry<InstanceIdentifier<?>, DataObject>>();
+        updatedEntries.addAll(transaction.getModification().getUpdatedConfigurationData().entrySet());
+        updatedEntries.removeAll(createdEntries);
+
+        Set<InstanceIdentifier<?>> removeEntriesInstanceIdentifiers = transaction.getModification()
+                .getRemovedConfigurationData();
+        transaction.getModification().getOriginalConfigurationData();
+        for (Entry<InstanceIdentifier<?>, DataObject> entry : createdEntries) {
+            if (entry.getValue() instanceof Flow) {
+                logger.debug("Coming add cc in FlowDatacommitHandler");
+                Flow flow = (Flow) entry.getValue();
+                boolean status = validate(flow);
+                if (!status) {
+                    return;
+                }
+                addFlow(entry.getKey(), (Flow) entry.getValue());
+            }
         }
-        for (@SuppressWarnings("unused")
-        Entry<InstanceIdentifier<?>, Flow> entry : transaction.updates.entrySet()) {
-            System.out.println("Coming update cc in FlowDatacommitHandler");
-            updateFlow(entry.getKey(), entry.getValue());
+       
+        for (Entry<InstanceIdentifier<?>, DataObject> entry : updatedEntries) {
+            if (entry.getValue() instanceof Flow) {
+                logger.debug("Coming update cc in FlowDatacommitHandler");
+                Flow updatedFlow = (Flow) entry.getValue();
+                Flow originalFlow = (Flow) transaction.modification.getOriginalConfigurationData().get(entry.getKey());
+                boolean status = validate(updatedFlow);
+                if (!status) {
+                    return;
+                }
+                updateFlow(entry.getKey(), updatedFlow, originalFlow);
+            }
         }
 
-        for (Entry<InstanceIdentifier<?>, Flow> entry : transaction.removals.entrySet()) {
-            System.out.println("Coming remove cc in FlowDatacommitHandler");
-            removeFlow(entry.getKey(), entry.getValue());
+        for (InstanceIdentifier<?> instanceId : removeEntriesInstanceIdentifiers) {
+            DataObject removeValue = transaction.getModification().getOriginalConfigurationData().get(instanceId);
+            if (removeValue instanceof Flow) {
+                logger.debug("Coming remove cc in FlowDatacommitHandler");
+                Flow flow = (Flow) removeValue;
+                boolean status = validate(flow);
+                
+                if (!status) {
+                    return;
+                }
+                
+                removeFlow(instanceId, (Flow) removeValue);
+            }
         }
-
     }
 
-    private final class FlowDataCommitHandler implements DataCommitHandler<InstanceIdentifier<?>, DataObject> {
-
+    private final class FlowDataCommitHandler implements DataCommitHandler<InstanceIdentifier<?>, DataObject> {   
+     
         @SuppressWarnings("unchecked")
-        @Override
-        public DataCommitTransaction requestCommit(DataModification<InstanceIdentifier<?>, DataObject> modification) {
+        public DataCommitTransaction<InstanceIdentifier<?>, DataObject> requestCommit(DataModification<InstanceIdentifier<?>, DataObject> modification) {
             // We should verify transaction
-            System.out.println("Coming in FlowDatacommitHandler");
+            logger.debug("Coming in FlowDatacommitHandler");
             internalTransaction transaction = new internalTransaction(modification);
             transaction.prepareUpdate();
             return transaction;
@@ -313,92 +204,24 @@ public class FlowConsumerImpl implements IForwardingRulesManager {
         public internalTransaction(DataModification<InstanceIdentifier<?>, DataObject> modification) {
             this.modification = modification;
         }
-
-        Map<InstanceIdentifier<?>, Flow> additions = new HashMap<>();
-        Map<InstanceIdentifier<?>, Flow> updates = new HashMap<>();
-        Map<InstanceIdentifier<?>, Flow> removals = new HashMap<>();
-
+        
         /**
          * We create a plan which flows will be added, which will be updated and
          * which will be removed based on our internal state.
          *
          */
-        void prepareUpdate() {
-
-            Set<Entry<InstanceIdentifier<?>, DataObject>> puts = modification.getUpdatedConfigurationData().entrySet();
-            for (Entry<InstanceIdentifier<?>, DataObject> entry : puts) {
-
-                // validating the DataObject
-
-                Status status = validate(container, (NodeFlow) entry);
-                if (!status.isSuccess()) {
-                    logger.warn("Invalid Configuration for flow {}. The failure is {}", entry, status.getDescription());
-                    String error = "Invalid Configuration (" + status.getDescription() + ")";
-                    logger.error(error);
-                    return;
-                }
-                // Presence check
-                if (flowEntryExists((NodeFlow) entry)) {
-                    String error = "Entry with this name on specified table already exists";
-                    logger.warn("Entry with this name on specified table already exists: {}", entry);
-                    logger.error(error);
-                    return;
-                }
-                if (originalSwView.containsKey(entry)) {
-                    logger.warn("Operation Rejected: A flow with same match and priority exists on the target node");
-                    logger.trace("Aborting to install {}", entry);
-                    continue;
-                }
-                if (!FRMUtil.validateMatch((NodeFlow) entry)) {
-                    logger.error("Not a valid Match");
-                    return;
-                }
-                if (!FRMUtil.validateInstructions((NodeFlow) entry)) {
-                    logger.error("Not a valid Instruction");
-                    return;
-                }
-                if (entry.getValue() instanceof Flow) {
-                    Flow flow = (Flow) entry.getValue();
-                    preparePutEntry(entry.getKey(), flow);
-                }
-
-            }
-
-            // removals = modification.getRemovedConfigurationData();
-            Set<InstanceIdentifier<?>> removedData = modification.getRemovedConfigurationData();
-            for (InstanceIdentifier<?> removal : removedData) {
-                DataObject value = modification.getOriginalConfigurationData().get(removal);
-                if (value instanceof Flow) {
-                    removals.put(removal, (Flow) value);
-                }
-            }
+        void prepareUpdate() {          
 
         }
-
-        private void preparePutEntry(InstanceIdentifier<?> key, Flow flow) {
-            Flow original = originalSwView.get(key);
-            if (original != null) {
-                // It is update for us
-                System.out.println("Coming update  in FlowDatacommitHandler");
-                updates.put(key, flow);
-            } else {
-                // It is addition for us
-                System.out.println("Coming add in FlowDatacommitHandler");
-                additions.put(key, flow);
-            }
-        }
-
+       
         /**
          * We are OK to go with execution of plan
          *
          */
         @Override
         public RpcResult<Void> finish() throws IllegalStateException {
-
-            commitToPlugin(this);
-            // We return true if internal transaction is successful.
-            // return Rpcs.getRpcResult(true, null, Collections.emptySet());
-            return Rpcs.getRpcResult(true, null, null);
+            commitToPlugin(this);            
+            return Rpcs.getRpcResult(true, null, Collections.<RpcError> emptySet());
         }
 
         /**
@@ -407,69 +230,47 @@ public class FlowConsumerImpl implements IForwardingRulesManager {
          *
          */
         @Override
-        public RpcResult<Void> rollback() throws IllegalStateException {
-            // NOOP - we did not modified any internal state during
-            // requestCommit phase
-            // return Rpcs.getRpcResult(true, null, Collections.emptySet());
-            return Rpcs.getRpcResult(true, null, null);
-
-        }
+        public RpcResult<Void> rollback() throws IllegalStateException {       
+            rollBackFlows(modification);
+            return Rpcs.getRpcResult(true, null, Collections.<RpcError> emptySet());
 
-        public Status validate(IContainer container, NodeFlow dataObject) {
-
-            // container validation
-            Switch sw = null;
-            Node node = null;
-            String containerName = (container == null) ? GlobalConstants.DEFAULT.toString() : container.getName();
-            ISwitchManager switchManager = (ISwitchManager) ServiceHelper.getInstance(ISwitchManager.class,
-                    containerName, this);
-            // flow Name validation
-            if (dataObject.getFlowName() == null || dataObject.getFlowName().trim().isEmpty()
-                    || !dataObject.getFlowName().matches(NAMEREGEX)) {
-                return new Status(StatusCode.BADREQUEST, "Invalid Flow name");
-            }
-            // Node Validation
-            if (dataObject.getNode() == null) {
-                return new Status(StatusCode.BADREQUEST, "Node is null");
-            }
-
-            if (switchManager != null) {
-                for (Switch device : switchManager.getNetworkDevices()) {
-                    node = (Node) device.getNode();
-                    if (device.getNode().equals(dataObject.getNode())) {
-                        sw = device;
-                        break;
-                    }
-                }
-                if (sw == null) {
-                    return new Status(StatusCode.BADREQUEST, String.format("Node %s not found", node));
-                }
-            } else {
-                logger.debug("switchmanager is not set yet");
-            }
+        }       
+    }
 
-            if (dataObject.getPriority() != null) {
-                if (dataObject.getPriority() < 0 || dataObject.getPriority() > 65535) {
-                    return new Status(StatusCode.BADREQUEST, String.format("priority %s is not in the range 0 - 65535",
-                            dataObject.getPriority()));
-                }
-            }
+    private void rollBackFlows(DataModification<InstanceIdentifier<?>, DataObject> modification) {
+     Set<Entry<InstanceIdentifier<? extends DataObject>, DataObject>> createdEntries = modification.getCreatedConfigurationData().entrySet();
 
-            return new Status(StatusCode.SUCCESS);
+    /*
+     * This little dance is because updatedEntries contains both created and modified entries
+     * The reason I created a new HashSet is because the collections we are returned are immutable.
+     */
+    Set<Entry<InstanceIdentifier<? extends DataObject>, DataObject>> updatedEntries = new HashSet<Entry<InstanceIdentifier<? extends DataObject>, DataObject>>();
+    updatedEntries.addAll(modification.getUpdatedConfigurationData().entrySet());
+    updatedEntries.removeAll(createdEntries);
+
+    Set<InstanceIdentifier<? >> removeEntriesInstanceIdentifiers = modification.getRemovedConfigurationData();
+    for (Entry<InstanceIdentifier<?>, DataObject> entry : createdEntries) {
+        if(entry.getValue() instanceof Flow) {
+            removeFlow(entry.getKey(),(Flow) entry.getValue()); // because we are rolling back, remove what we would have added.
         }
-
-        private boolean flowEntryExists(NodeFlow config) {
-            // Flow name has to be unique on per table id basis
-            for (ConcurrentMap.Entry<FlowKey, Flow> entry : originalSwView.entrySet()) {
-                if (entry.getValue().getFlowName().equals(config.getFlowName())
-                        && entry.getValue().getTableId().equals(config.getTableId())) {
-                    return true;
-                }
-            }
-            return false;
+    }
+    
+    for (Entry<InstanceIdentifier<?>, DataObject> entry : updatedEntries) {
+        if(entry.getValue() instanceof Flow) {            
+            Flow updatedFlow = (Flow) entry.getValue();
+            Flow originalFlow = (Flow) modification.getOriginalConfigurationData().get(entry.getKey());
+            updateFlow(entry.getKey(), updatedFlow ,originalFlow);// because we are rolling back, replace the updated with the original
         }
     }
 
+    for (InstanceIdentifier<?> instanceId : removeEntriesInstanceIdentifiers ) {
+        DataObject removeValue = (Flow) modification.getOriginalConfigurationData().get(instanceId);
+        if(removeValue instanceof Flow) {
+            addFlow(instanceId,(Flow) removeValue);// because we are rolling back, add what we would have removed.
+
+        }
+    }
+}
     final class FlowEventListener implements SalFlowListener {
 
         List<FlowAdded> addedFlows = new ArrayList<>();
@@ -478,25 +279,19 @@ public class FlowConsumerImpl implements IForwardingRulesManager {
 
         @Override
         public void onFlowAdded(FlowAdded notification) {
-            System.out.println("added flow..........................");
             addedFlows.add(notification);
         }
 
         @Override
         public void onFlowRemoved(FlowRemoved notification) {
             removedFlows.add(notification);
-        };
+        }
 
         @Override
         public void onFlowUpdated(FlowUpdated notification) {
             updatedFlows.add(notification);
         }
 
-        @Override
-        public void onSwitchFlowRemoved(SwitchFlowRemoved notification) {
-            // TODO
-        }
-
         @Override
         public void onNodeErrorNotification(NodeErrorNotification notification) {
             // TODO Auto-generated method stub
@@ -507,134 +302,64 @@ public class FlowConsumerImpl implements IForwardingRulesManager {
         public void onNodeExperimenterErrorNotification(NodeExperimenterErrorNotification notification) {
             // TODO Auto-generated method stub
 
-        };
-
-    }
-
-    // Commented out DataChangeListene - to be used by Stats
-
-    // final class FlowDataListener implements DataChangeListener {
-    // private SalFlowService flowService;
-    //
-    // public FlowDataListener() {
-    //
-    // }
-    //
-    // @Override
-    // public void onDataChanged(
-    // DataChangeEvent<InstanceIdentifier<?>, DataObject> change) {
-    // System.out.println("Coming in onDataChange..............");
-    // @SuppressWarnings("unchecked")
-    // Collection<DataObject> additions = (Collection<DataObject>)
-    // change.getCreatedConfigurationData();
-    // // we can check for getCreated, getDeleted or getUpdated from DataChange
-    // Event class
-    // for (DataObject dataObject : additions) {
-    // if (dataObject instanceof NodeFlow) {
-    // NodeRef nodeOne = createNodeRef("foo:node:1");
-    // // validating the dataObject here
-    // AddFlowInputBuilder input = new AddFlowInputBuilder();
-    // input.setNode(((NodeFlow) dataObject).getNode());
-    // input.setNode(nodeOne);
-    // // input.setPriority(((NodeFlow) dataObject).getPriority());
-    // //input.setMatch(((NodeFlow) dataObject).getMatch());
-    // //input.setFlowTable(((NodeFlow) dataObject).getFlowTable());
-    // //input.setCookie(((NodeFlow) dataObject).getCookie());
-    // //input.setAction(((NodeFlow) dataObject).getAction());
-    //
-    // @SuppressWarnings("unused")
-    // Future<RpcResult<java.lang.Void>> result =
-    // flowService.addFlow(input.build());
-    // }
-    // }
-    // }
-    // }
-
-    private static void updateLocalDatabase(NodeFlow entry, boolean add) {
-
-        updateSwViewes(entry, add);
-
-        updateNodeFlowsDB(entry, add);
-
-    }
+        }
 
-    /*
-     * Update the node mapped flows database
-     */
-    private static void updateSwViewes(NodeFlow entry, boolean add) {
-        if (add) {
-            FlowConsumerImpl.originalSwView.put((FlowKey) entry, (Flow) entry);
-            installedSwView.put((FlowKey) entry, (Flow) entry);
-        } else {
-            originalSwView.remove(entry);
-            installedSwView.remove(entry);
+        @Override
+        public void onSwitchFlowRemoved(SwitchFlowRemoved notification) {
+            // TODO Auto-generated method stub
 
         }
     }
 
-    @Override
-    public List<DataObject> get() {
+    public boolean validate(Flow flow) {
+        String msg = ""; // Specific part of warn/error log
 
-        List<DataObject> orderedList = new ArrayList<DataObject>();
-        ConcurrentMap<Integer, Flow> flowMap = staticFlows;
-        int maxKey = staticFlowsOrdinal.get(0).intValue();
-        for (int i = 0; i <= maxKey; i++) {
-            Flow entry = flowMap.get(i);
-            if (entry != null) {
-                orderedList.add(entry);
-            }
+        boolean result = true;
+        // flow Name validation
+        if (!FRMUtil.isNameValid(flow.getFlowName())) {
+            msg = "Invalid Flow name";
+            result = false;
+        }
+        
+        // Node Validation
+        if (result == true && flow.getNode() == null) {
+            msg = "Node is null";
+            result = false;
         }
-        return orderedList;
-    }
 
-    @Override
-    public DataObject getWithName(String name, org.opendaylight.controller.sal.core.Node n) {
-        if (this instanceof FlowConsumerImpl) {
-            for (ConcurrentMap.Entry<Integer, Flow> flowEntry : staticFlows.entrySet()) {
-                Flow flow = flowEntry.getValue();
-                if (flow.getNode().equals(n) && flow.getFlowName().equals(name)) {
+        // TODO: Validate we are seeking to program a flow against a valid
+        // Node
 
-                    return flowEntry.getValue();
-                }
+        if (result == true && flow.getPriority() != null) {
+            if (flow.getPriority() < 0 || flow.getPriority() > 65535) {
+                msg = String.format("priority %s is not in the range 0 - 65535", flow.getPriority());
+                result = false;
             }
         }
-        return null;
-    }
-
-    /*
-     * Update the node mapped flows database
-     */
-    private static void updateNodeFlowsDB(NodeFlow entry, boolean add) {
-        Node node = (Node) entry.getNode();
-
-        List<Flow> nodeIndeces = nodeFlows.get(node);
-        if (nodeIndeces == null) {
-            if (!add) {
-                return;
-            } else {
-                nodeIndeces = new ArrayList<Flow>();
-            }
+       
+        if (!FRMUtil.validateMatch(flow)) {
+            logger.error("Not a valid Match");
+            result = false;
         }
-
-        if (add) {
-            nodeIndeces.add((Flow) entry);
-        } else {
-            nodeIndeces.remove(entry);
+        if (!FRMUtil.validateInstructions(flow)) {
+            logger.error("Not a valid Instruction");
+            result = false;
         }
-
-        // Update cache across cluster
-        if (nodeIndeces.isEmpty()) {
-            nodeFlows.remove(node);
-        } else {
-            nodeFlows.put(node, nodeIndeces);
+        if (result == false) {
+            logger.warn("Invalid Configuration for flow {}. The failure is {}", flow, msg);
+            logger.error("Invalid Configuration ({})", msg);
         }
+        return result;
     }
-
-    private static NodeRef createNodeRef(String string) {
-        NodeKey key = new NodeKey(new NodeId(string));
-        InstanceIdentifier<Node> path = InstanceIdentifier.builder().node(Nodes.class).node(Node.class, key)
-                .toInstance();
-
-        return new NodeRef(path);
+    
+    private InstanceIdentifier<?> createTableInstance(Long tableId, NodeRef nodeRef) {        
+        Table table;
+        InstanceIdentifier<Table> tableInstance;
+        TableBuilder builder = new TableBuilder();
+        builder.setId(tableId);
+        builder.setKey(new TableKey(tableId, nodeRef));
+        table = builder.build();
+        tableInstance = InstanceIdentifier.builder(Tables.class).child(Table.class, table.getKey()).toInstance();
+        return tableInstance;
     }
-}
+}
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