elanmanager/elanmanager-impl/src/main/java/org/opendaylight/vpnservice/elan/internal/ElanInterfaceManager.java

   1 /*
   2  * Copyright (c) 2016 Ericsson India Global Services Pvt Ltd. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.vpnservice.elan.internal;
   9
  10 import com.google.common.base.Optional;
  11 import com.google.common.collect.Maps;
  12 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  13 import org.opendaylight.controller.md.sal.binding.api.DataChangeListener;
  14 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataBroker.DataChangeScope;
  15 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  16 import org.opendaylight.vpnservice.elan.utils.ElanConstants;
  17 import org.opendaylight.vpnservice.elan.utils.ElanUtils;
  18 import org.opendaylight.vpnservice.interfacemgr.globals.InterfaceInfo;
  19 import org.opendaylight.vpnservice.interfacemgr.globals.InterfaceInfo.InterfaceType;
  20 import org.opendaylight.vpnservice.interfacemgr.interfaces.IInterfaceManager;
  21
  22 import org.opendaylight.vpnservice.mdsalutil.NwConstants;
  23 import org.opendaylight.vpnservice.itm.globals.ITMConstants;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.list.Action;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.Flow;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.group.buckets.Bucket;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.groups.Group;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.servicebinding.rev151015.service.bindings.services.info.BoundServices;
  29 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.list.Instruction;
  30 import org.opendaylight.vpnservice.mdsalutil.*;
  31 import org.opendaylight.vpnservice.mdsalutil.interfaces.IMdsalApiManager;
  32 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.PhysAddress;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupTypes;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.ElanDpnInterfaces;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.ElanForwardingTables;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.ElanInterfaces;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan._interface.forwarding.entries.ElanInterfaceMac;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan._interface.forwarding.entries.ElanInterfaceMacBuilder;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan._interface.forwarding.entries.ElanInterfaceMacKey;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.dpn.interfaces.ElanDpnInterfacesList;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.dpn.interfaces.elan.dpn.interfaces.list.DpnInterfaces;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.dpn.interfaces.elan.dpn.interfaces.list.DpnInterfacesBuilder;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.dpn.interfaces.elan.dpn.interfaces.list.DpnInterfacesKey;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.forwarding.tables.MacTable;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.forwarding.tables.MacTableKey;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.instances.ElanInstance;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.instances.ElanInstanceBuilder;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.interfaces.ElanInterface;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.state.Elan;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.state.ElanBuilder;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.state.ElanKey;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.forwarding.entries.MacEntry;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.forwarding.entries.MacEntryBuilder;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.forwarding.entries.MacEntryKey;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.idmanager.rev150403.IdManagerService;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.interfacemgr.rpcs.rev151003.OdlInterfaceRpcService;
  57 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  58 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  59 import org.slf4j.Logger;
  60 import org.slf4j.LoggerFactory;
  61
  62 import java.math.BigInteger;
  63 import java.util.*;
  64 import java.util.concurrent.ConcurrentHashMap;
  65 import java.util.concurrent.ConcurrentLinkedQueue;
  66
  67
  68 public class ElanInterfaceManager extends AbstractDataChangeListener<ElanInterface> implements AutoCloseable {
  69
  70     private static ElanInterfaceManager elanInterfaceManager = new ElanInterfaceManager();
  71     private ListenerRegistration<DataChangeListener> elanInterfaceListenerRegistration;
  72     private ListenerRegistration<DataChangeListener> itmInterfaceListenerRegistration;
  73     private OdlInterfaceRpcService interfaceManagerRpcService;
  74     private DataBroker broker;
  75     private IMdsalApiManager mdsalManager;
  76     private IInterfaceManager interfaceManager;
  77     private IdManagerService idManager;
  78
  79     private ElanForwardingEntriesHandler elanForwardingEntriesHandler;
  80     private Map<String, ConcurrentLinkedQueue<ElanInterface>> unProcessedElanInterfaces =
  81             new ConcurrentHashMap<String, ConcurrentLinkedQueue<ElanInterface>> ();
  82
  83     private static final Logger logger = LoggerFactory.getLogger(ElanInterfaceManager.class);
  84
  85     public ElanInterfaceManager() {
  86         super(ElanInterface.class);
  87     }
  88
  89     public static ElanInterfaceManager getElanInterfaceManager() {
  90         return elanInterfaceManager;
  91     }
  92
  93     public void setMdSalApiManager(IMdsalApiManager mdsalManager) {
  94         this.mdsalManager = mdsalManager;
  95     }
  96
  97     public void setInterfaceManagerRpcService(OdlInterfaceRpcService ifManager) {
  98         this.interfaceManagerRpcService = ifManager;
  99     }
 100
 101     public void setElanForwardingEntriesHandler(ElanForwardingEntriesHandler elanForwardingEntriesHandler) {
 102         this.elanForwardingEntriesHandler = elanForwardingEntriesHandler;
 103     }
 104
 105     public void setInterfaceManager(IInterfaceManager interfaceManager) {
 106         this.interfaceManager = interfaceManager;
 107     }
 108
 109     public void setDataBroker(DataBroker broker) {
 110         this.broker = broker;
 111     }
 112
 113     @Override
 114     public void close() throws Exception {
 115         if (elanInterfaceListenerRegistration != null) {
 116             try {
 117                 elanInterfaceListenerRegistration.close();
 118             } catch (final Exception e) {
 119                 logger.error("Error when cleaning up DataChangeListener.", e);
 120             }
 121             elanInterfaceListenerRegistration = null;
 122         }
 123     }
 124
 125     public void registerListener() {
 126         try {
 127             elanInterfaceListenerRegistration = broker.registerDataChangeListener(LogicalDatastoreType.CONFIGURATION,
 128                     getElanInterfaceWildcardPath(), ElanInterfaceManager.this, DataChangeScope.SUBTREE);
 129         } catch (final Exception e) {
 130             logger.error("ELAN Interface DataChange listener registration failed !", e);
 131             throw new IllegalStateException("ELAN Interface registration Listener failed.", e);
 132         }
 133     }
 134
 135     private InstanceIdentifier<?> getElanInterfaceWildcardPath() {
 136         return InstanceIdentifier.create(ElanInterfaces.class).child(ElanInterface.class);
 137     }
 138
 139     public void setIdManager(IdManagerService idManager) {
 140         this.idManager = idManager;
 141     }
 142
 143     @Override
 144     protected void remove(InstanceIdentifier<ElanInterface> identifier, ElanInterface del) {
 145         String interfaceName =  del.getName();
 146         ElanInstance elanInfo = ElanUtils.getElanInstanceByName(del.getElanInstanceName());
 147         removeElanInterface(elanInfo, interfaceName);
 148     }
 149
 150     public void removeElanService(ElanInterface del, InterfaceInfo interfaceInfo) {
 151         ElanInstance elanInstance = ElanUtils.getElanInstanceByName(del.getElanInstanceName());
 152         String interfaceName = del.getName();
 153         removeElanInterface(elanInstance, interfaceInfo);
 154         unbindService(elanInstance, interfaceName);
 155     }
 156
 157     public void removeElanInterface(ElanInstance elanInfo, String interfaceName) {
 158         String elanName = elanInfo.getElanInstanceName();
 159         InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(interfaceName);
 160         if (interfaceInfo == null) {
 161             ElanInterfaceMac elanInterfaceMac =  ElanUtils.getElanInterfaceMacByInterfaceName(interfaceName);
 162             if(elanInterfaceMac != null && elanInterfaceMac.getMacEntry() != null) {
 163                List<MacEntry> macEntries = elanInterfaceMac.getMacEntry();
 164                 for(MacEntry macEntry : macEntries) {
 165                     ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getMacEntryOperationalDataPath(elanName, macEntry.getMacAddress()));
 166                 }
 167             }
 168             ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInterfaceMacEntriesOperationalDataPath(interfaceName));
 169             Elan elanState = ElanUtils.getElanByName(elanName);
 170             List<String> elanInterfaces = elanState.getElanInterfaces();
 171             elanInterfaces.remove(interfaceName);
 172             if(elanInterfaces.isEmpty()) {
 173                 ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInstanceOperationalDataPath(elanName));
 174                 ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanMacTableOperationalDataPath(elanName));
 175                 ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInfoEntriesOperationalDataPath(elanInfo.getElanTag()));
 176                 ElanUtils.delete(broker, LogicalDatastoreType.CONFIGURATION, ElanUtils.getElanInstanceConfigurationDataPath(elanName));
 177             } else {
 178                 Elan updateElanState = new ElanBuilder().setElanInterfaces(elanInterfaces).setName(elanName).setKey(new ElanKey(elanName)).build();
 179                 MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInstanceOperationalDataPath(elanName), updateElanState);
 180             }
 181             return;
 182         }
 183         removeElanInterface(elanInfo, interfaceInfo);
 184         unbindService(elanInfo, interfaceName);
 185     }
 186
 187     private void removeElanInterface(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 188
 189         BigInteger dpId = interfaceInfo.getDpId();
 190         String elanName = elanInfo.getElanInstanceName();
 191         String interfaceName = interfaceInfo.getInterfaceName();
 192         Elan elanState = ElanUtils.getElanByName(elanName);
 193         logger.debug("Removing the Interface:{} from elan:{}", interfaceName, elanName);
 194         InstanceIdentifier<ElanInterfaceMac> elanInterfaceId = ElanUtils.getElanInterfaceMacEntriesOperationalDataPath(interfaceName);
 195         Optional<ElanInterfaceMac> existingElanInterface = ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, elanInterfaceId);
 196         if(existingElanInterface.isPresent()) {
 197             List<MacEntry> macEntries = existingElanInterface.get().getMacEntry();
 198             if(macEntries != null && !macEntries.isEmpty()) {
 199                 for (MacEntry macEntry : macEntries) {
 200                     logger.debug("removing the  mac-entry:{} present on elanInterface:{}", macEntry.getMacAddress().getValue(), interfaceName);
 201                     elanForwardingEntriesHandler.deleteElanInterfaceForwardingEntries(elanInfo, interfaceInfo, macEntry);
 202                 }
 203             }
 204         }
 205         /*
 206          *This condition check is mainly to get DPN-ID in pre-provision deletion scenario after stopping CSS
 207          */
 208         if(dpId.equals(ElanConstants.INVALID_DPN)) {
 209             ElanDpnInterfacesList elanDpnInterfacesList = ElanUtils.getElanDpnInterfacesList(elanName);
 210             if(elanDpnInterfacesList != null && !elanDpnInterfacesList.getDpnInterfaces().isEmpty()) {
 211                 List<DpnInterfaces> dpnIfList = elanDpnInterfacesList.getDpnInterfaces();
 212                 for (DpnInterfaces dpnInterface : dpnIfList) {
 213                     DpnInterfaces dpnIfLists = ElanUtils.getElanInterfaceInfoByElanDpn(elanName, dpnInterface.getDpId());
 214                     if (dpnIfLists.getInterfaces().contains(interfaceName)) {
 215                         logger.debug("deleting the elanInterface from the ElanDpnInterface cache in pre-provision scenario of elan:{} dpn:{} interfaceName:{}", elanName, dpId, interfaceName);
 216                         removeElanDpnInterfaceFromOperationalDataStore(elanName, dpId, interfaceName);
 217                         break;
 218                     }
 219                 }
 220             }
 221         } else {
 222             removeElanDpnInterfaceFromOperationalDataStore(elanName, dpId, interfaceName);
 223         }
 224
 225         removeStaticELanFlows(elanInfo, interfaceInfo);
 226         ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, elanInterfaceId);
 227         List<String> elanInterfaces = elanState.getElanInterfaces();
 228         elanInterfaces.remove(interfaceName);
 229
 230         if(elanInterfaces.isEmpty()) {
 231             ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInstanceOperationalDataPath(elanName));
 232             ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanDpnOperationDataPath(elanName));
 233             ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanMacTableOperationalDataPath(elanName));
 234             ElanUtils.delete(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInfoEntriesOperationalDataPath(elanInfo.getElanTag()));
 235             //ElanUtils.delete(broker, LogicalDatastoreType.CONFIGURATION, ElanUtils.getElanInstanceConfigurationDataPath(elanName));
 236         } else {
 237             Elan updateElanState = new ElanBuilder().setElanInterfaces(elanInterfaces).setName(elanName).setKey(new ElanKey(elanName)).build();
 238             MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInstanceOperationalDataPath(elanName), updateElanState);
 239         }
 240     }
 241
 242     private void removeElanDpnInterfaceFromOperationalDataStore(String elanName, BigInteger dpId, String interfaceName) {
 243         DpnInterfaces dpnInterfaces =  ElanUtils.getElanInterfaceInfoByElanDpn(elanName, dpId);
 244         if(dpnInterfaces != null) {
 245             List<String> interfaceLists = dpnInterfaces.getInterfaces();
 246             interfaceLists.remove(interfaceName);
 247             updateElanDpnInterfacesList(elanName, dpId, interfaceLists);
 248         }
 249     }
 250
 251     @Override
 252     protected void update(InstanceIdentifier<ElanInterface> identifier, ElanInterface original, ElanInterface update) {
 253         // updating the static-Mac Entries for the existing elanInterface
 254         String elanName = update.getElanInstanceName();
 255         String interfaceName = update.getName();
 256         InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(interfaceName);
 257         List<PhysAddress> existingPhysAddress = original.getStaticMacEntries();
 258         List<PhysAddress> updatedPhysAddress = update.getStaticMacEntries();
 259         if(updatedPhysAddress != null && !updatedPhysAddress.isEmpty()) {
 260             List<PhysAddress> existingClonedPhyAddress = new ArrayList<>();
 261             if(existingPhysAddress != null && !existingPhysAddress.isEmpty()) {
 262                 existingClonedPhyAddress.addAll(0, existingPhysAddress);
 263                 existingPhysAddress.removeAll(updatedPhysAddress);
 264                 updatedPhysAddress.removeAll(existingClonedPhyAddress);
 265                 // removing the PhyAddress which are not presented in the updated List
 266                 for(PhysAddress physAddress: existingPhysAddress) {
 267                     removeInterfaceStaticMacEntires(elanName, interfaceName, physAddress);
 268                 }
 269             }
 270             // Adding the new PhysAddress which are presented in the updated List
 271             if(updatedPhysAddress.size() > 0) {
 272                 for(PhysAddress physAddress: updatedPhysAddress) {
 273                     InstanceIdentifier<MacEntry> macId =  getMacEntryOperationalDataPath(elanName, physAddress);
 274                     Optional<MacEntry> existingMacEntry = ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, macId);
 275                     if(existingMacEntry.isPresent()) {
 276                         elanForwardingEntriesHandler.updateElanInterfaceForwardingTablesList(elanName, interfaceName, existingMacEntry.get().getInterface(), existingMacEntry.get());
 277                     } else {
 278                         elanForwardingEntriesHandler.addElanInterfaceForwardingTableList(ElanUtils.getElanInstanceByName(elanName), interfaceName, physAddress);
 279                     }
 280                 }
 281             }
 282         } else if(existingPhysAddress != null && !existingPhysAddress.isEmpty()) {
 283             for( PhysAddress physAddress : existingPhysAddress) {
 284                 removeInterfaceStaticMacEntires(elanName, interfaceName, physAddress);
 285             }
 286         }
 287     }
 288
 289     @Override
 290     protected void add(InstanceIdentifier<ElanInterface> identifier, ElanInterface elanInterfaceAdded) {
 291         String elanInstanceName = elanInterfaceAdded.getElanInstanceName();
 292         String interfaceName = elanInterfaceAdded.getName();
 293         InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(interfaceName);
 294         ElanInstance elanInstance = ElanUtils.getElanInstanceByName(elanInstanceName);
 295
 296         if (elanInstance == null) {
 297             elanInstance = new ElanInstanceBuilder().setElanInstanceName(elanInstanceName).setDescription(elanInterfaceAdded.getDescription()).build();
 298             //Add the ElanInstance in the Configuration data-store
 299             ElanUtils.UpdateOperationalDataStore(broker, idManager, elanInstance);
 300             elanInstance = ElanUtils.getElanInstanceByName(elanInstanceName);
 301         }
 302
 303
 304         Long elanTag = elanInstance.getElanTag();
 305         // If elan tag is not updated, then put the elan interface into unprocessed entry map and entry. Let entries
 306         // in this map get processed during ELAN update DCN.
 307         if (elanTag == null) {
 308             ConcurrentLinkedQueue<ElanInterface> elanInterfaces = unProcessedElanInterfaces.get(elanInstanceName);
 309             if (elanInterfaces == null) {
 310                 elanInterfaces = new ConcurrentLinkedQueue<ElanInterface>();
 311             }
 312             elanInterfaces.add(elanInterfaceAdded);
 313             unProcessedElanInterfaces.put(elanInstanceName, elanInterfaces);
 314             return;
 315         }
 316         addElanInterface(elanInterfaceAdded, interfaceInfo, elanInstance);
 317     }
 318
 319     void handleunprocessedElanInterfaces(ElanInstance elanInstance) {
 320         Queue<ElanInterface> elanInterfaces = unProcessedElanInterfaces.get(elanInstance.getElanInstanceName());
 321         if (elanInterfaces == null || elanInterfaces.isEmpty()) {
 322             return;
 323         }
 324         for (ElanInterface elanInterface: elanInterfaces) {
 325             String interfaceName = elanInterface.getName();
 326             InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(interfaceName);
 327             addElanInterface(elanInterface, interfaceInfo, elanInstance);
 328         }
 329     }
 330
 331     void addElanInterface(ElanInterface elanInterface, InterfaceInfo interfaceInfo, ElanInstance elanInstance) {
 332         String interfaceName = elanInterface.getName();
 333         String elanInstanceName = elanInterface.getElanInstanceName();
 334         List<PhysAddress> staticMacAddresses = elanInterface.getStaticMacEntries();
 335         Elan elanInfo = ElanUtils.getElanByName(elanInstanceName);
 336         BigInteger dpId = null;
 337         if(elanInfo == null) {
 338             ElanUtils.UpdateOperationalDataStore(broker, idManager, elanInstance);
 339         }
 340         if(interfaceInfo != null) {
 341             dpId = interfaceInfo.getDpId();
 342         }
 343         if(dpId != null && !dpId.equals(ElanConstants.INVALID_DPN)) {
 344             InstanceIdentifier<DpnInterfaces> elanDpnInterfaces = ElanUtils.getElanDpnInterfaceOperationalDataPath(elanInstanceName, dpId);
 345             Optional<DpnInterfaces> existingElanDpnInterfaces = ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, elanDpnInterfaces);
 346             if (!existingElanDpnInterfaces.isPresent()) {
 347                 createElanInterfacesList(elanInstanceName, interfaceName, dpId);
 348             } else {
 349                 List<String> elanInterfaces = existingElanDpnInterfaces.get().getInterfaces();
 350                 elanInterfaces.add(interfaceName);
 351                 updateElanDpnInterfacesList(elanInstanceName, dpId, elanInterfaces);
 352             }
 353         }
 354
 355         // add code to install Local/Remote BC group, unknow DMAC entry, terminating service table flow entry
 356         // call bindservice of interfacemanager to create ingress table flow enty.
 357         //Add interface to the ElanInterfaceForwardingEntires Container
 358         createElanInterfaceTablesList(interfaceName);
 359         createElanStateList(elanInstanceName, interfaceName);
 360         if(interfaceInfo != null) {
 361             installFlowsAndGroups(elanInstance, interfaceInfo);
 362         }
 363         // add the static mac addresses
 364         if(staticMacAddresses != null) {
 365             for (PhysAddress physAddress : staticMacAddresses) {
 366                 InstanceIdentifier<MacEntry> macId = getMacEntryOperationalDataPath(elanInstanceName, physAddress);
 367                 Optional<MacEntry> existingMacEntry = ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, macId);
 368                 if (existingMacEntry.isPresent()) {
 369                     elanForwardingEntriesHandler.updateElanInterfaceForwardingTablesList(elanInstanceName, interfaceName, existingMacEntry.get().getInterface(), existingMacEntry.get());
 370                 } else {
 371                     elanForwardingEntriesHandler.addElanInterfaceForwardingTableList(elanInstance, interfaceName, physAddress);
 372                 }
 373                 if(interfaceInfo != null && isOperational(interfaceInfo)) {
 374                     logger.debug("Installing Static Mac-Entry on the Elan Interface:{} with MacAddress:{}", interfaceInfo, physAddress.getValue());
 375                     ElanUtils.setupMacFlows(elanInstance, interfaceInfo, ElanConstants.STATIC_MAC_TIMEOUT, physAddress.getValue());
 376                 }
 377             }
 378         }
 379     }
 380
 381     private Map<BigInteger, List<String>> readFePortsDbForElan(String elanName) {
 382         ElanDpnInterfacesList elanDpnInterfacesList = ElanUtils.getElanDpnInterfacesList(elanName);
 383         HashMap<BigInteger, List<String>> fePortsDb = Maps.newHashMap();
 384         if (elanDpnInterfacesList == null) {
 385             return fePortsDb;
 386         }
 387         List<DpnInterfaces> dpnInterfaces = elanDpnInterfacesList.getDpnInterfaces();
 388         if (dpnInterfaces == null) {
 389             return fePortsDb;
 390         }
 391         for (DpnInterfaces dpnInterface : dpnInterfaces) {
 392             fePortsDb.put(dpnInterface.getDpId(), dpnInterface.getInterfaces());
 393         }
 394         return fePortsDb;
 395     }
 396
 397     protected void removeInterfaceStaticMacEntires(String elanInstanceName, String interfaceName, PhysAddress physAddress) {
 398         InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(interfaceName);
 399         InstanceIdentifier<MacEntry> macId =  getMacEntryOperationalDataPath(elanInstanceName, physAddress);
 400         Optional<MacEntry> existingMacEntry = ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, macId);
 401
 402         if(!existingMacEntry.isPresent()) {
 403             return;
 404         }
 405
 406         MacEntry macEntry = new MacEntryBuilder().setMacAddress(physAddress).setInterface(interfaceName).setKey(new MacEntryKey(physAddress)).build();
 407         elanForwardingEntriesHandler.deleteElanInterfaceForwardingEntries(ElanUtils.getElanInstanceByName(elanInstanceName), interfaceInfo, macEntry);
 408         elanForwardingEntriesHandler.deleteElanInterfaceMacForwardingEntries(interfaceName, physAddress);
 409     }
 410
 411
 412     private InstanceIdentifier<MacEntry> getMacEntryOperationalDataPath(String elanName, PhysAddress physAddress) {
 413         return InstanceIdentifier.builder(ElanForwardingTables.class).child(MacTable.class,
 414                 new MacTableKey(elanName)).child(MacEntry.class, new MacEntryKey(physAddress)).build();
 415     }
 416
 417     public void installFlowsAndGroups(final ElanInstance elanInfo, final InterfaceInfo interfaceInfo) {
 418         if (isOperational(interfaceInfo)) {
 419
 420             // LocalBroadcast Group creation with elan-Interfaces
 421             setupElanBroadcastGroups(elanInfo, interfaceInfo);
 422
 423             setupLocalBroadcastGroups(elanInfo, interfaceInfo);
 424             //Terminating Service , UnknownDMAC Table.
 425             setupTerminateServiceTable(elanInfo, interfaceInfo);
 426             setupUnknownDMacTable(elanInfo, interfaceInfo);
 427             setupFilterEqualsTable(elanInfo, interfaceInfo);
 428             // bind the Elan service to the Interface
 429             bindService(elanInfo, interfaceInfo.getInterfaceName());
 430
 431             //update the remote-DPNs remoteBC group entry with Tunnels
 432             setElanBCGrouponOtherDpns(elanInfo, interfaceInfo);
 433         }
 434     }
 435
 436     public void setupFilterEqualsTable(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 437         int ifTag = interfaceInfo.getInterfaceTag();
 438         Flow flow = MDSALUtil.buildFlowNew(ElanConstants.ELAN_FILTER_EQUALS_TABLE, getFlowRef(ElanConstants.ELAN_FILTER_EQUALS_TABLE, ifTag),
 439                 9, elanInfo.getElanInstanceName(), 0, 0, ElanConstants.COOKIE_ELAN_FILTER_EQUALS.add(BigInteger.valueOf(ifTag)), getTunnelIdMatchForFilterEqualsLPortTag(ifTag), ElanUtils.getInstructionsInPortForOutGroup(interfaceInfo.getInterfaceName()));
 440
 441         mdsalManager.installFlow(interfaceInfo.getDpId(), flow);
 442
 443         Flow flowEntry = MDSALUtil.buildFlowNew(ElanConstants.ELAN_FILTER_EQUALS_TABLE, getFlowRef(ElanConstants.ELAN_FILTER_EQUALS_TABLE, 1000+ifTag),
 444                 10, elanInfo.getElanInstanceName(), 0, 0, ElanConstants.COOKIE_ELAN_FILTER_EQUALS.add(BigInteger.valueOf(ifTag)), getMatchesForFilterEqualsLPortTag(ifTag),
 445                 getInstructionsDrop());
 446
 447         mdsalManager.installFlow(interfaceInfo.getDpId(), flowEntry);
 448     }
 449
 450     public void removeFilterEqualsTable(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 451         int ifTag = interfaceInfo.getInterfaceTag();
 452         Flow flow = MDSALUtil.buildFlowNew(ElanConstants.ELAN_FILTER_EQUALS_TABLE, getFlowRef(ElanConstants.ELAN_FILTER_EQUALS_TABLE, ifTag),
 453                 9, elanInfo.getElanInstanceName(), 0, 0, ElanConstants.COOKIE_ELAN_FILTER_EQUALS.add(BigInteger.valueOf(ifTag)), getTunnelIdMatchForFilterEqualsLPortTag(ifTag), ElanUtils.getInstructionsInPortForOutGroup(interfaceInfo.getInterfaceName()));
 454
 455         mdsalManager.removeFlow(interfaceInfo.getDpId(), flow);
 456
 457         Flow flowEntity = MDSALUtil.buildFlowNew(ElanConstants.ELAN_FILTER_EQUALS_TABLE, getFlowRef(ElanConstants.ELAN_FILTER_EQUALS_TABLE, 1000+ifTag),
 458                 10, elanInfo.getElanInstanceName(), 0, 0, ElanConstants.COOKIE_ELAN_FILTER_EQUALS.add(BigInteger.valueOf(ifTag)), getMatchesForFilterEqualsLPortTag(ifTag),
 459                 getInstructionsDrop());
 460
 461         mdsalManager.removeFlow(interfaceInfo.getDpId(), flowEntity);
 462     }
 463
 464     private List<Bucket> getRemoteBCGroupBucketInfos(ElanInstance elanInfo,
 465                                                      int bucketKeyStart, InterfaceInfo interfaceInfo) {
 466         BigInteger dpnId = interfaceInfo.getDpId();
 467         int elanTag = elanInfo.getElanTag().intValue();
 468         int bucketId = bucketKeyStart;
 469         List<Bucket> listBuckets = new ArrayList<Bucket>();
 470         ElanDpnInterfacesList elanDpns = ElanUtils.getElanDpnInterfacesList(elanInfo.getElanInstanceName());
 471         if(elanDpns != null) {
 472             List<DpnInterfaces> dpnInterfaceses = elanDpns.getDpnInterfaces();
 473             for(DpnInterfaces dpnInterface : dpnInterfaceses) {
 474                if(ElanUtils.isDpnPresent(dpnInterface.getDpId()) && dpnInterface.getDpId() != dpnId && dpnInterface.getInterfaces() != null && !dpnInterface.getInterfaces().isEmpty()) {
 475                    try {
 476                        List<Action> listAction = ElanUtils.getItmEgressAction(dpnId, dpnInterface.getDpId(), (int) elanTag);
 477                        listBuckets.add(MDSALUtil.buildBucket(listAction, MDSALUtil.GROUP_WEIGHT, bucketId, MDSALUtil.WATCH_PORT, MDSALUtil.WATCH_GROUP));
 478                        bucketId++;
 479                    } catch (Exception ex) {
 480                        logger.error( "Logical Group Interface not found between source Dpn - {}, destination Dpn - {} " ,dpnId, dpnInterface.getDpId() );
 481                    }
 482                }
 483             }
 484         }
 485         return listBuckets;
 486     }
 487
 488     private List<Bucket> getRemoteBCGroupBuckets(ElanInstance elanInfo,
 489                                                          InterfaceInfo interfaceInfo, int bucketId) {
 490         BigInteger dpnId = interfaceInfo.getDpId();
 491         int elanTag = elanInfo.getElanTag().intValue();
 492         List<Bucket> listBucketInfo = new ArrayList<Bucket>();
 493         ElanDpnInterfacesList elanDpns = ElanUtils.getElanDpnInterfacesList(elanInfo.getElanInstanceName());
 494         if(elanDpns != null) {
 495             List<DpnInterfaces> dpnInterfaceses = elanDpns.getDpnInterfaces();
 496             for(DpnInterfaces dpnInterface : dpnInterfaceses) {
 497                 if(ElanUtils.isDpnPresent(dpnInterface.getDpId()) && dpnInterface.getDpId() != dpnId && dpnInterface.getInterfaces() != null && !dpnInterface.getInterfaces().isEmpty()) {
 498                     try {
 499                         List<Action> listActionInfo = ElanUtils.getItmEgressAction(dpnId, dpnInterface.getDpId(), (int) elanTag);
 500                         listBucketInfo.add(MDSALUtil.buildBucket(listActionInfo, 0, bucketId, 0xffffffffL, 0xffffffffL));
 501                         bucketId++;
 502                     } catch (Exception ex) {
 503                         logger.error( "Logical Group Interface not found between source Dpn - {}, destination Dpn - {} " ,dpnId, dpnInterface.getDpId() );
 504                     }
 505                 }
 506             }
 507         }
 508         return listBucketInfo;
 509     }
 510
 511     private void setElanBCGrouponOtherDpns(ElanInstance elanInfo,
 512                                            InterfaceInfo interfaceInfo) {
 513         BigInteger dpnId = interfaceInfo.getDpId();
 514         int elanTag = elanInfo.getElanTag().intValue();
 515         long groupId = ElanUtils.getElanRemoteBCGID(elanTag);
 516         List<Bucket> listBucket = new ArrayList<Bucket>();
 517         int bucketId = 0;
 518         ElanDpnInterfacesList elanDpns = ElanUtils.getElanDpnInterfacesList(elanInfo.getElanInstanceName());
 519         if(elanDpns != null) {
 520             List<DpnInterfaces> dpnInterfaceses = elanDpns.getDpnInterfaces();
 521             for(DpnInterfaces dpnInterface : dpnInterfaceses) {
 522               List<Bucket> remoteListBucketInfo = new ArrayList<Bucket>();
 523                 if(ElanUtils.isDpnPresent(dpnInterface.getDpId()) && !dpnInterface.getDpId().equals(dpnId) && dpnInterface.getInterfaces() != null && !dpnInterface.getInterfaces().isEmpty()) {
 524                     for(String ifName : dpnInterface.getInterfaces()) {
 525                         // In case if there is a InterfacePort in the cache which is not in
 526                         // operational state, skip processing it
 527                         InterfaceInfo ifInfo = interfaceManager.getInterfaceInfoFromOperationalDataStore(ifName, interfaceInfo.getInterfaceType());
 528                         if (!isOperational(ifInfo)) {
 529                             continue;
 530                         }
 531
 532                         listBucket.add(MDSALUtil.buildBucket(getInterfacePortActions(ifInfo), MDSALUtil.GROUP_WEIGHT, bucketId, MDSALUtil.WATCH_PORT, MDSALUtil.WATCH_GROUP));
 533                         bucketId++;
 534                     }
 535                     remoteListBucketInfo.addAll(listBucket);
 536                     for(DpnInterfaces otherFes : dpnInterfaceses) {
 537                         if (ElanUtils.isDpnPresent(otherFes.getDpId()) && otherFes.getDpId() != dpnInterface.getDpId()
 538                                 && otherFes.getInterfaces() != null && ! otherFes.getInterfaces().isEmpty()) {
 539                             try {
 540                                 List<Action> remoteListActionInfo = ElanUtils.getItmEgressAction(dpnInterface.getDpId(), otherFes.getDpId(), (int) elanTag);
 541                                 remoteListBucketInfo.add(MDSALUtil.buildBucket(remoteListActionInfo, MDSALUtil.GROUP_WEIGHT, bucketId, MDSALUtil.WATCH_PORT,MDSALUtil.WATCH_GROUP));
 542                                 bucketId++;
 543                             } catch (Exception ex) {
 544                                 logger.error( "Logical Group Interface not found between source Dpn - {}, destination Dpn - {} " ,dpnInterface.getDpId(), otherFes.getDpId() );
 545                                 return;
 546                             }
 547                         }
 548                     }
 549                     if(remoteListBucketInfo.size() == 0) {
 550                         logger.debug( "No ITM is present on Dpn - {} " ,dpnInterface.getDpId());
 551                         continue;
 552                     }
 553                     Group group = MDSALUtil.buildGroup(groupId, elanInfo.getElanInstanceName(), GroupTypes.GroupAll, MDSALUtil.buildBucketLists(remoteListBucketInfo));
 554                     mdsalManager.syncInstallGroup(dpnInterface.getDpId(), group, ElanConstants.DELAY_TIME_IN_MILLISECOND);
 555                 }
 556             }
 557         }
 558     }
 559
 560     private void updateRemoteBCGrouponDpnTunnelEvent(ElanInstance elanInfo,
 561                                                InterfaceInfo interfaceInfo, BigInteger dstDpId) {
 562         int elanTag = elanInfo.getElanTag().intValue();
 563         long groupId = ElanUtils.getElanRemoteBCGID(elanTag);
 564         DpnInterfaces dpnInterfaces = ElanUtils.getElanInterfaceInfoByElanDpn(elanInfo.getElanInstanceName(), interfaceInfo.getDpId());
 565         List<DpnInterfaces> elanDpns = ElanUtils.getInvolvedDpnsInElan(elanInfo.getElanInstanceName());
 566         if(elanDpns != null) {
 567             for(DpnInterfaces dpnInterface : elanDpns) {
 568                 int bucketId = 0;
 569                 List<Bucket> remoteListBucket = new ArrayList<Bucket>();
 570                 if(ElanUtils.isDpnPresent(dstDpId) && dpnInterface.getDpId().equals(dstDpId) && dpnInterface.getInterfaces() != null && !dpnInterface.getInterfaces().isEmpty()) {
 571                     for(String ifName : dpnInterfaces.getInterfaces()) {
 572                         // In case if there is a InterfacePort in the cache which is not in
 573                         // operational state, skip processing it
 574                         InterfaceInfo ifInfo = interfaceManager.getInterfaceInfoFromOperationalDataStore(ifName, interfaceInfo.getInterfaceType());
 575                         if (!isOperational(ifInfo)) {
 576                             continue;
 577                         }
 578
 579                         remoteListBucket.add(MDSALUtil.buildBucket(getInterfacePortActions(ifInfo), MDSALUtil.GROUP_WEIGHT, bucketId, MDSALUtil.WATCH_PORT, MDSALUtil.WATCH_GROUP));
 580                         bucketId++;
 581                     }
 582                     try {
 583                         List<Action> remoteListActionInfo = ElanUtils.getItmEgressAction(interfaceInfo.getDpId(), dstDpId, (int) elanTag);
 584                         remoteListBucket.add(MDSALUtil.buildBucket(remoteListActionInfo, MDSALUtil.GROUP_WEIGHT, bucketId, MDSALUtil.WATCH_PORT, MDSALUtil.WATCH_GROUP));
 585                         bucketId++;
 586                     } catch (Exception ex) {
 587                         logger.error( "Logical Group Interface not found between source Dpn - {}, destination Dpn - {} " ,dpnInterface.getDpId(), dstDpId);
 588                         return;
 589                     }
 590                     Group group = MDSALUtil.buildGroup(groupId, elanInfo.getElanInstanceName(), GroupTypes.GroupAll, MDSALUtil.buildBucketLists(remoteListBucket));
 591                     mdsalManager.syncInstallGroup(interfaceInfo.getDpId(), group, ElanConstants.DELAY_TIME_IN_MILLISECOND);
 592                     break;
 593                 }
 594             }
 595         }
 596     }
 597
 598
 599     /**
 600      * Returns the bucket info with the given interface as the only bucket.
 601      */
 602     private Bucket getLocalBCGroupBucketInfo(InterfaceInfo interfaceInfo, int bucketIdStart) {
 603         return MDSALUtil.buildBucket(getInterfacePortActions(interfaceInfo), MDSALUtil.GROUP_WEIGHT, bucketIdStart, MDSALUtil.WATCH_PORT, MDSALUtil.WATCH_GROUP);
 604     }
 605
 606     private List<MatchInfo> getMatchesForElanTag(Long elanTag) {
 607         List<MatchInfo> mkMatches = new ArrayList<MatchInfo>();
 608         // Matching metadata
 609         mkMatches.add(new MatchInfo(MatchFieldType.metadata, new BigInteger[] {
 610                 ElanUtils.getElanMetadataLabel(elanTag),
 611                 MetaDataUtil.METADATA_MASK_SERVICE }));
 612         return mkMatches;
 613     }
 614
 615     private List<Instruction> getInstructionsForOutGroup(
 616             long groupId) {
 617         List<Instruction> mkInstructions = new ArrayList<Instruction>();
 618         List <Action> actions = new ArrayList <Action> ();
 619         actions.add(new ActionInfo(ActionType.group, new String[]{Long.toString(groupId)}).buildAction());
 620         mkInstructions.add(ElanUtils.getWriteActionInstruction(actions));
 621         return mkInstructions;
 622     }
 623
 624     public void removeFlowsAndGroups(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 625         removeStaticELanFlows(elanInfo, interfaceInfo);
 626         unbindService(elanInfo, interfaceInfo.getInterfaceName());
 627     }
 628
 629     public void installMacAddressTables(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 630         String interfaceName = interfaceInfo.getInterfaceName();
 631         BigInteger currentDpn = interfaceInfo.getDpId();
 632         ElanInterfaceMac elanInterfaceMac = ElanUtils.getElanInterfaceMacByInterfaceName(interfaceName);
 633         if(elanInterfaceMac != null && elanInterfaceMac.getMacEntry() != null) {
 634             List<MacEntry> macEntries =  elanInterfaceMac.getMacEntry();
 635             for(MacEntry macEntry : macEntries) {
 636                 PhysAddress physAddress = macEntry.getMacAddress();
 637                 ElanUtils.setupMacFlows(elanInfo, interfaceInfo, macEntry.isIsStaticAddress() ? ElanConstants.STATIC_MAC_TIMEOUT : elanInfo.getMacTimeout(), physAddress.getValue());
 638             }
 639             //Programming the remoteDMACFlows
 640             ElanDpnInterfacesList elanDpnInterfacesList =  ElanUtils.getElanDpnInterfacesList(elanInfo.getElanInstanceName());
 641             List<DpnInterfaces> dpnInterfaceLists =  elanDpnInterfacesList.getDpnInterfaces();
 642             for(DpnInterfaces dpnInterfaces : dpnInterfaceLists){
 643                 if(dpnInterfaces.getDpId().equals(interfaceInfo.getDpId())) {
 644                     continue;
 645                 }
 646                 List<String> remoteElanInterfaces = dpnInterfaces.getInterfaces();
 647                 for(String remoteIf : remoteElanInterfaces) {
 648                     ElanInterfaceMac elanIfMac = ElanUtils.getElanInterfaceMacByInterfaceName(remoteIf);
 649                     InterfaceInfo remoteInterface = interfaceManager.getInterfaceInfo(remoteIf);
 650                     if(elanIfMac == null) {
 651                         continue;
 652                     }
 653                     List<MacEntry> remoteMacEntries = elanIfMac.getMacEntry();
 654                     if(remoteMacEntries != null) {
 655                         for (MacEntry macEntry : remoteMacEntries) {
 656                             PhysAddress physAddress = macEntry.getMacAddress();
 657                             ElanUtils.setupRemoteDmacFlow(currentDpn, remoteInterface.getDpId(), remoteInterface.getInterfaceTag(), elanInfo.getElanTag(), physAddress.getValue(), elanInfo.getElanInstanceName());
 658                         }
 659                     }
 660                 }
 661             }
 662         }
 663     }
 664
 665     // Install DMAC entry on dst DPN
 666     public void installDMacAddressTables(ElanInstance elanInfo, InterfaceInfo interfaceInfo, BigInteger dstDpId) {
 667         String interfaceName = interfaceInfo.getInterfaceName();
 668         ElanInterfaceMac elanInterfaceMac = ElanUtils.getElanInterfaceMacByInterfaceName(interfaceName);
 669         if(elanInterfaceMac != null && elanInterfaceMac.getMacEntry() != null) {
 670             List<MacEntry> macEntries =  elanInterfaceMac.getMacEntry();
 671             for(MacEntry macEntry : macEntries) {
 672                 PhysAddress physAddress = macEntry.getMacAddress();
 673                 ElanUtils.setupDMacFlowonRemoteDpn(elanInfo, interfaceInfo, dstDpId, physAddress.getValue());
 674             }
 675         }
 676     }
 677
 678     public void removeMacAddressTables(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 679         ElanInterfaceMac elanInterfaceMac = ElanUtils.getElanInterfaceMacByInterfaceName(interfaceInfo.getInterfaceName());
 680         if(elanInterfaceMac != null && elanInterfaceMac.getMacEntry() != null) {
 681             List<MacEntry> macEntries =  elanInterfaceMac.getMacEntry();
 682             for(MacEntry macEntry : macEntries) {
 683                 ElanUtils.deleteMacFlows(elanInfo, interfaceInfo, macEntry);
 684             }
 685         }
 686     }
 687
 688     public void setupElanBroadcastGroups(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 689         List<Bucket> listBucket = new ArrayList<Bucket>();
 690         int bucketId = 0;
 691         BigInteger dpnId = interfaceInfo.getDpId();
 692         long groupId = ElanUtils.getElanRemoteBCGID(elanInfo.getElanTag());
 693
 694         DpnInterfaces dpnInterfaces = ElanUtils.getElanInterfaceInfoByElanDpn(elanInfo.getElanInstanceName(), dpnId);
 695         for(String ifName : dpnInterfaces.getInterfaces()) {
 696             // In case if there is a InterfacePort in the cache which is not in
 697             // operational state, skip processing it
 698             InterfaceInfo ifInfo = interfaceManager.getInterfaceInfoFromOperationalDataStore(ifName, interfaceInfo.getInterfaceType());
 699             if (ifInfo == null || !isOperational(ifInfo)) {
 700                 continue;
 701             }
 702
 703             listBucket.add(MDSALUtil.buildBucket(getInterfacePortActions(ifInfo), MDSALUtil.GROUP_WEIGHT, bucketId, MDSALUtil.WATCH_PORT, MDSALUtil.WATCH_GROUP));
 704             bucketId++;
 705         }
 706         List<Bucket> listBucketInfoRemote = getRemoteBCGroupBuckets(elanInfo, interfaceInfo, bucketId);
 707         listBucket.addAll(listBucketInfoRemote);
 708
 709         Group group = MDSALUtil.buildGroup(groupId, elanInfo.getElanInstanceName(), GroupTypes.GroupAll, MDSALUtil.buildBucketLists(listBucket));
 710         logger.trace("installing the localBroadCast Group:{}", group);
 711         // In the case of OVS disconnected we receive null object when we query Interface Operation datastore
 712         // so the size of the bucket will be zero
 713         if(listBucket.size() == 0) {
 714             mdsalManager.syncRemoveGroup(dpnId, group);
 715         } else {
 716             mdsalManager.syncInstallGroup(dpnId, group, ElanConstants.DELAY_TIME_IN_MILLISECOND);
 717         }
 718     }
 719
 720     public void setupLocalBroadcastGroups(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 721         List<Bucket> listBucket = new ArrayList<Bucket>();
 722         int bucketId = 0;
 723         BigInteger dpnId = interfaceInfo.getDpId();
 724         long groupId = ElanUtils.getElanLocalBCGID(elanInfo.getElanTag());
 725
 726         DpnInterfaces dpnInterfaces = ElanUtils.getElanInterfaceInfoByElanDpn(elanInfo.getElanInstanceName(), dpnId);
 727         for(String ifName : dpnInterfaces.getInterfaces()) {
 728             // In case if there is a InterfacePort in the cache which is not in
 729             // operational state, skip processing it
 730             InterfaceInfo ifInfo = interfaceManager.getInterfaceInfoFromOperationalDataStore(ifName, interfaceInfo.getInterfaceType());
 731             if (ifInfo == null || !isOperational(ifInfo)) {
 732                 continue;
 733             }
 734
 735             listBucket.add(MDSALUtil.buildBucket(getInterfacePortActions(ifInfo), MDSALUtil.GROUP_WEIGHT, bucketId, MDSALUtil.WATCH_PORT, MDSALUtil.WATCH_GROUP));
 736             bucketId++;
 737         }
 738
 739
 740         Group group = MDSALUtil.buildGroup(groupId, elanInfo.getElanInstanceName(), GroupTypes.GroupAll, MDSALUtil.buildBucketLists(listBucket));
 741         logger.trace("installing the localBroadCast Group:{}", group);
 742         // In the case of OVS disconnected we receive null object for the Interface Operation datastore
 743         // so the size of the bucket will be zero
 744         if(listBucket.size() == 0) {
 745             mdsalManager.syncRemoveGroup(dpnId, group);
 746         } else {
 747             mdsalManager.syncInstallGroup(dpnId, group, ElanConstants.DELAY_TIME_IN_MILLISECOND);
 748         }
 749     }
 750
 751     public void removeLocalBroadcastGroup(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 752         BigInteger dpnId = interfaceInfo.getDpId();
 753         long groupId = ElanUtils.getElanLocalBCGID(elanInfo.getElanTag());
 754         List<Bucket> listBuckets = new ArrayList<>();
 755         int bucketId = 0;
 756         listBuckets.add(getLocalBCGroupBucketInfo(interfaceInfo, bucketId));
 757         //listBuckets.addAll(getRemoteBCGroupBucketInfos(elanInfo, 1, interfaceInfo));
 758         Group group = MDSALUtil.buildGroup(groupId, elanInfo.getElanInstanceName(), GroupTypes.GroupAll, MDSALUtil.buildBucketLists(listBuckets));
 759         logger.trace("deleted the localBroadCast Group:{}", group);
 760         mdsalManager.syncRemoveGroup(dpnId, group);
 761     }
 762
 763     public void removeElanBroadcastGroup(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 764         int bucketId = 0;
 765         List<Bucket> listBuckets = new ArrayList<>();
 766         listBuckets.add(getLocalBCGroupBucketInfo(interfaceInfo, bucketId));
 767         bucketId++;
 768         listBuckets.addAll(getRemoteBCGroupBucketInfos(elanInfo, bucketId, interfaceInfo));
 769         BigInteger dpnId = interfaceInfo.getDpId();
 770         long groupId = ElanUtils.getElanRemoteBCGID(elanInfo.getElanTag());
 771         Group group = MDSALUtil.buildGroup(groupId, elanInfo.getElanInstanceName(), GroupTypes.GroupAll, MDSALUtil.buildBucketLists(listBuckets));
 772         logger.trace("deleting the remoteBroadCast group:{}", group);
 773         mdsalManager.syncRemoveGroup(dpnId, group);
 774     }
 775
 776     public void setupTerminateServiceTable(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 777         long elanTag = elanInfo.getElanTag();
 778         Flow flowEntity = MDSALUtil.buildFlowNew(NwConstants.INTERNAL_TUNNEL_TABLE, getFlowRef(NwConstants.INTERNAL_TUNNEL_TABLE, elanTag),
 779                 5, String.format("%s:%d","ITM Flow Entry ",elanTag), 0,  0, ITMConstants.COOKIE_ITM.add(BigInteger.valueOf(elanTag)), ElanUtils.getTunnelMatchesForServiceId((int)elanTag),
 780                 getInstructionsForOutGroup(ElanUtils.getElanRemoteBCGID(elanTag)));
 781
 782         mdsalManager.installFlow(interfaceInfo.getDpId(), flowEntity);
 783     }
 784
 785     public void setupUnknownDMacTable(ElanInstance elanInfo, InterfaceInfo interfaceInfo) {
 786         long elanTag = elanInfo.getElanTag();
 787         Flow flowEntity = MDSALUtil.buildFlowNew(ElanConstants.ELAN_UNKNOWN_DMAC_TABLE, getFlowRef(ElanConstants.ELAN_UNKNOWN_DMAC_TABLE, elanTag),
 788                 5, elanInfo.getElanInstanceName(), 0, 0, ElanConstants.COOKIE_ELAN_UNKNOWN_DMAC.add(BigInteger.valueOf(elanTag)), getMatchesForElanTag(elanTag),
 789                 getInstructionsForOutGroup(ElanUtils.getElanRemoteBCGID(elanTag)));
 790
 791         mdsalManager.installFlow(interfaceInfo.getDpId(), flowEntity);
 792     }
 793
 794     private void removeStaticELanFlows(final ElanInstance elanInfo, final InterfaceInfo interfaceInfo) {
 795         BigInteger dpId = interfaceInfo.getDpId();
 796         long elanTag = elanInfo.getElanTag();
 797         /*
 798          * If there are not elan ports, remove the unknown smac and default dmac
 799          * flows
 800          */
 801         DpnInterfaces dpnInterfaces = ElanUtils.getElanInterfaceInfoByElanDpn(elanInfo.getElanInstanceName(), dpId);
 802         if(dpnInterfaces == null) {
 803             return;
 804         }
 805         List <String> elanInterfaces = dpnInterfaces.getInterfaces();
 806         if (elanInterfaces == null || elanInterfaces.isEmpty()) {
 807
 808             logger.debug("deleting the elan: {} present on dpId: {}", elanInfo.getElanInstanceName(), dpId);
 809             removeDefaultTermFlow(dpId, elanInfo.getElanTag());
 810             removeUnknownDmacFlow(dpId, elanInfo);
 811             removeElanBroadcastGroup(elanInfo, interfaceInfo);
 812             removeLocalBroadcastGroup(elanInfo, interfaceInfo);
 813             removeFilterEqualsTable(elanInfo, interfaceInfo);
 814         } else {
 815             setupElanBroadcastGroups(elanInfo, interfaceInfo);
 816             setupLocalBroadcastGroups(elanInfo, interfaceInfo);
 817             removeFilterEqualsTable(elanInfo, interfaceInfo);
 818         }
 819     }
 820
 821     private void removeUnknownDmacFlow(BigInteger dpId, ElanInstance elanInfo) {
 822         Flow flow = getUnknownDmacFlowEntity(dpId, elanInfo);
 823         mdsalManager.removeFlow(dpId, flow);
 824     }
 825
 826     private void removeDefaultTermFlow(BigInteger dpId, long elanTag) {
 827         ElanUtils.removeTerminatingServiceAction(dpId, (int) elanTag);
 828     }
 829
 830     private void bindService(ElanInstance elanInfo, String interfaceName) {
 831        // interfaceManager.bindService(interfaceName, ElanUtils.getServiceInfo(elanInfo.getElanInstanceName(), elanInfo.getElanTag(), interfaceName));
 832
 833         int priority = ElanConstants.ELAN_SERVICE_PRIORITY;
 834         int instructionKey = 0;
 835         List<Instruction> instructions = new ArrayList<Instruction>();
 836         instructions.add(MDSALUtil.buildAndGetWriteMetadaInstruction(ElanUtils.getElanMetadataLabel(elanInfo.getElanTag()), MetaDataUtil.METADATA_MASK_SERVICE, ++instructionKey));
 837         instructions.add(MDSALUtil.buildAndGetGotoTableInstruction(ElanConstants.ELAN_SMAC_TABLE, ++instructionKey));
 838         BoundServices
 839                 serviceInfo =
 840                 ElanUtils.getBoundServices(String.format("%s.%s.%s", "vpn",elanInfo.getElanInstanceName(), interfaceName),
 841                         ElanConstants.ELAN_SERVICE_INDEX, priority,
 842                         ElanConstants.COOKIE_ELAN_INGRESS_TABLE, instructions);
 843         ElanUtils.syncWrite(broker, LogicalDatastoreType.CONFIGURATION,
 844                 ElanUtils.buildServiceId(interfaceName, ElanConstants.ELAN_SERVICE_INDEX), serviceInfo);
 845     }
 846
 847     private void unbindService(ElanInstance elanInfo, String interfaceName) {
 848         ElanUtils.delete(broker, LogicalDatastoreType.CONFIGURATION,
 849                 ElanUtils.buildServiceId(interfaceName,ElanConstants.ELAN_SERVICE_INDEX),
 850                 ElanUtils.DEFAULT_CALLBACK);
 851     }
 852
 853     private void unbindService(ElanInstance elanInfo, String interfaceName, int vlanId) {
 854         ElanUtils.delete(broker, LogicalDatastoreType.CONFIGURATION,
 855                 ElanUtils.buildServiceId(interfaceName,ElanConstants.ELAN_SERVICE_INDEX),
 856                 ElanUtils.DEFAULT_CALLBACK);
 857     }
 858
 859     private Flow getUnknownDmacFlowEntity(BigInteger dpId, ElanInstance elanInfo) {
 860         long elanTag = elanInfo.getElanTag();
 861         List<MatchInfo> mkMatches = new ArrayList<MatchInfo>();
 862         // Matching metadata
 863         mkMatches.add(new MatchInfo(MatchFieldType.metadata, new BigInteger[] {
 864                 ElanUtils.getElanMetadataLabel(elanTag),
 865                 MetaDataUtil.METADATA_MASK_SERVICE }));
 866
 867         List<Instruction> mkInstructions = new ArrayList<Instruction>();
 868         List <Action> actionsInfos = new ArrayList <Action> ();
 869         actionsInfos.add(new ActionInfo(ActionType.group, new String[]{Long.toString(ElanUtils.getElanRemoteBCGID(elanTag))}, 0).buildAction());
 870         mkInstructions.add(ElanUtils.getWriteActionInstruction(actionsInfos));
 871
 872         Flow flow = MDSALUtil.buildFlowNew(ElanConstants.ELAN_UNKNOWN_DMAC_TABLE, getFlowRef(ElanConstants.ELAN_UNKNOWN_DMAC_TABLE, elanTag),
 873                 5, elanInfo.getElanInstanceName(), 0, 0, ElanConstants.COOKIE_ELAN_UNKNOWN_DMAC.add(BigInteger.valueOf(elanTag)),
 874                 mkMatches, mkInstructions);
 875         return flow;
 876     }
 877
 878     private String getFlowRef(long tableId, long elanTag) {
 879         return new StringBuffer().append(tableId).append(elanTag).toString();
 880     }
 881
 882     private List<Action> getInterfacePortActions(InterfaceInfo interfaceInfo) {
 883         List<Action> listAction = new ArrayList<Action>();
 884         int actionKey = 0;
 885         listAction.add((new ActionInfo(ActionType.set_field_tunnel_id, new BigInteger[] {BigInteger.valueOf(interfaceInfo.getInterfaceTag())}, actionKey)).buildAction());
 886         actionKey++;
 887         listAction.add((new ActionInfo(ActionType.nx_resubmit, new BigInteger[] {BigInteger.valueOf(55)}, actionKey)).buildAction());
 888         return listAction;
 889     }
 890
 891     private void updateElanDpnInterfacesList(String elanInstanceName, BigInteger dpId, List<String> interfaceNames) {
 892         DpnInterfaces dpnInterface = new DpnInterfacesBuilder().setDpId(dpId)
 893                 .setInterfaces(interfaceNames).setKey(new DpnInterfacesKey(dpId)).build();
 894         MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanDpnInterfaceOperationalDataPath(elanInstanceName, dpId),
 895                 dpnInterface);
 896     }
 897
 898     private List<String> createElanInterfacesList(String elanInstanceName, String interfaceName, BigInteger dpId) {
 899         List<String> interfaceNames = new ArrayList<String>();
 900         interfaceNames.add(interfaceName);
 901         DpnInterfaces dpnInterface = new DpnInterfacesBuilder().setDpId(dpId)
 902                 .setInterfaces(interfaceNames).setKey(new DpnInterfacesKey(dpId)).build();
 903         MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanDpnInterfaceOperationalDataPath(elanInstanceName, dpId),
 904                 dpnInterface);
 905         return interfaceNames;
 906     }
 907
 908     private void createElanInterfaceTablesList(String interfaceName) {
 909         InstanceIdentifier<ElanInterfaceMac> elanInterfaceMacTables = ElanUtils.getElanInterfaceMacEntriesOperationalDataPath(interfaceName);
 910         Optional<ElanInterfaceMac> interfaceMacTables = ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, elanInterfaceMacTables);
 911         // Adding new Elan Interface Port to the operational DataStore without Static-Mac Entries..
 912         if(!interfaceMacTables.isPresent()) {
 913             ElanInterfaceMac elanInterfaceMacTable = new ElanInterfaceMacBuilder().setElanInterface(interfaceName).setKey(new ElanInterfaceMacKey(interfaceName)).build();
 914             MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInterfaceMacEntriesOperationalDataPath(interfaceName),
 915                     elanInterfaceMacTable);
 916         }
 917     }
 918
 919     private void createElanStateList(String elanInstanceName, String interfaceName) {
 920         InstanceIdentifier<Elan> elanInstance = ElanUtils.getElanInstanceOperationalDataPath(elanInstanceName);
 921         Optional<Elan> elanInterfaceLists = ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, elanInstance);
 922         // Adding new Elan Interface Port to the operational DataStore without Static-Mac Entries..
 923         if(elanInterfaceLists.isPresent()) {
 924             List<String> interfaceLists = elanInterfaceLists.get().getElanInterfaces();
 925             if(interfaceLists == null) {
 926                 interfaceLists = new ArrayList<>();
 927             }
 928             interfaceLists.add(interfaceName);
 929             Elan elanState = new ElanBuilder().setName(elanInstanceName).setElanInterfaces(interfaceLists).setKey(new ElanKey(elanInstanceName)).build();
 930             MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanInstanceOperationalDataPath(elanInstanceName), elanState);
 931         }
 932     }
 933
 934     private boolean isOperational(InterfaceInfo interfaceInfo) {
 935         return ((interfaceInfo.getOpState() == InterfaceInfo.InterfaceOpState.UP) && (interfaceInfo.getAdminState() == InterfaceInfo.InterfaceAdminState.ENABLED));
 936     }
 937
 938     protected void updatedIfPrimaryAttributeChanged(ElanInterface elanInterface, boolean isUpdated) {
 939         String interfaceName = elanInterface.getName();
 940         InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(interfaceName);
 941         BigInteger dpId = interfaceInfo.getDpId();
 942         InstanceIdentifier<ElanInterfaceMac> elanInterfaceId = ElanUtils.getElanInterfaceMacEntriesOperationalDataPath(interfaceName);
 943         Optional<ElanInterfaceMac> existingElanInterface = ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, elanInterfaceId);
 944         ElanInstance elanInfo = ElanUtils.getElanInstanceByName(elanInterface.getElanInstanceName());
 945
 946         if(!existingElanInterface.isPresent()) {
 947             return;
 948         }
 949
 950         List<MacEntry> macEntries = existingElanInterface.get().getMacEntry();
 951         if(macEntries != null && !macEntries.isEmpty()) {
 952             for (MacEntry macEntry : macEntries) {
 953                 if(isUpdated) {
 954                     ElanUtils.setupMacFlows(elanInfo, interfaceInfo, ElanConstants.STATIC_MAC_TIMEOUT, macEntry.getMacAddress().getValue());
 955                 } else {
 956                     ElanUtils.deleteMacFlows(elanInfo, interfaceInfo, macEntry);
 957                 }
 958             }
 959         }
 960
 961         InstanceIdentifier<DpnInterfaces> dpnInterfaceId = ElanUtils.getElanDpnInterfaceOperationalDataPath(elanInterface.getElanInstanceName(), interfaceInfo.getDpId());
 962         Optional<DpnInterfaces> dpnInterfaces =  ElanUtils.read(broker, LogicalDatastoreType.OPERATIONAL, dpnInterfaceId);
 963         List<String> interfaceLists = dpnInterfaces.get().getInterfaces();
 964
 965         if(isUpdated) {
 966             interfaceLists.add(elanInterface.getName());
 967         } else {
 968             interfaceLists.remove(elanInterface.getName());
 969         }
 970
 971         DpnInterfaces  updateDpnInterfaces = new DpnInterfacesBuilder().setInterfaces(interfaceLists).setDpId(dpId).setKey(new DpnInterfacesKey(dpId)).build();
 972         MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, dpnInterfaceId, updateDpnInterfaces);
 973
 974         if(isUpdated) {
 975             installFlowsAndGroups(elanInfo, interfaceInfo);
 976         } else {
 977             removeStaticELanFlows(elanInfo, interfaceInfo);
 978             unbindService(elanInfo, interfaceName);
 979         }
 980     }
 981
 982     public void handleTunnelStateEvent(BigInteger srcDpId, BigInteger dstDpId) {
 983         ElanDpnInterfaces dpnInterfaceLists =  ElanUtils.getElanDpnInterfacesList();
 984         Set<String> elanInstancesMap = new HashSet<>();
 985         if(dpnInterfaceLists == null) {
 986             return;
 987         }
 988         List<ElanDpnInterfacesList> elanDpnIf = dpnInterfaceLists.getElanDpnInterfacesList();
 989         for(ElanDpnInterfacesList elanDpns: elanDpnIf) {
 990             int cnt = 0;
 991             String elanName = elanDpns.getElanInstanceName();
 992             List<DpnInterfaces> dpnInterfaces = elanDpns.getDpnInterfaces();
 993             if(dpnInterfaces == null) {
 994                continue;
 995             }
 996             for (DpnInterfaces dpnIf : dpnInterfaces) {
 997                if(dpnIf.getDpId().equals(srcDpId) || dpnIf.getDpId().equals(dstDpId)) {
 998                    cnt++;
 999                 }
1000             }
1001             if(cnt == 2) {
1002                 logger.debug("Elan instance:{} is present b/w srcDpn:{} and dstDpn:{}", elanName, srcDpId, dstDpId);
1003                 DpnInterfaces dpnInterface = ElanUtils.getElanInterfaceInfoByElanDpn(elanName, srcDpId);
1004                 Set<String> interfaceLists = new HashSet<>();
1005                 ElanInstance elanInfo = ElanUtils.getElanInstanceByName(elanName);
1006                 interfaceLists.addAll(dpnInterface.getInterfaces());
1007                 for(String ifName : interfaceLists) {
1008                     InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(ifName);
1009                     if (isOperational(interfaceInfo)) {
1010                         if (interfaceInfo.getDpId().equals(srcDpId) && !elanInstancesMap.contains(elanDpns.getElanInstanceName())) {
1011                             elanInstancesMap.add(elanDpns.getElanInstanceName());
1012                             elanInterfaceManager.updateRemoteBCGrouponDpnTunnelEvent(elanInfo, interfaceInfo, dstDpId);
1013                         }
1014                         elanInterfaceManager.installDMacAddressTables(elanInfo, interfaceInfo, dstDpId);
1015                     }
1016                 }
1017             }
1018
1019         }
1020     }
1021
1022     public void handleInterfaceUpated(InterfaceInfo interfaceInfo, ElanInstance elanInstance, boolean isStateUp) {
1023         BigInteger dpId = interfaceInfo.getDpId();
1024         String elanName = elanInstance.getElanInstanceName();
1025         String ifName = interfaceInfo.getInterfaceName();
1026         logger.trace("Handling interface update event for interface with info {} , state {}", interfaceInfo, isStateUp);
1027         if(isStateUp) {
1028
1029             DpnInterfaces dpnInterfaces = ElanUtils.getElanInterfaceInfoByElanDpn(elanName, dpId);
1030             if(dpnInterfaces == null) {
1031                 createElanInterfacesList(elanName, interfaceInfo.getInterfaceName(), dpId);
1032             } else {
1033               List<String> dpnElanInterfaces = dpnInterfaces.getInterfaces();
1034                 dpnElanInterfaces.add(interfaceInfo.getInterfaceName());
1035                 DpnInterfaces dpnInterface = new DpnInterfacesBuilder().setDpId(dpId)
1036                         .setInterfaces(dpnElanInterfaces).setKey(new DpnInterfacesKey(dpId)).build();
1037                 MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanDpnInterfaceOperationalDataPath(elanName, interfaceInfo.getDpId()), dpnInterface);
1038             }
1039
1040             logger.trace("ElanInterface Service is installed for interface:{}", ifName);
1041             elanInterfaceManager.installFlowsAndGroups(elanInstance, interfaceInfo);
1042             elanInterfaceManager.installMacAddressTables(elanInstance, interfaceInfo);
1043         } else {
1044
1045             DpnInterfaces dpnInterfaces = ElanUtils.getElanInterfaceInfoByElanDpn(elanName, dpId);
1046             if(dpnInterfaces != null) {
1047                 List<String> dpnElanInterfaces = dpnInterfaces.getInterfaces();
1048                 dpnElanInterfaces.remove(interfaceInfo.getInterfaceName());
1049                 DpnInterfaces dpnInterface = new DpnInterfacesBuilder().setDpId(dpId)
1050                         .setInterfaces(dpnElanInterfaces).setKey(new DpnInterfacesKey(dpId)).build();
1051                 MDSALUtil.syncWrite(broker, LogicalDatastoreType.OPERATIONAL, ElanUtils.getElanDpnInterfaceOperationalDataPath(elanName, interfaceInfo.getDpId()), dpnInterface);
1052             }
1053             logger.trace("ElanInterface Service is removed for the interface:{}", ifName);
1054             elanInterfaceManager.removeMacAddressTables(elanInstance, interfaceInfo);
1055             elanInterfaceManager.removeFlowsAndGroups(elanInstance, interfaceInfo);
1056         }
1057     }
1058
1059     private List<MatchInfo> getMatchesForFilterEqualsLPortTag(int LportTag) {
1060         List<MatchInfo> mkMatches = new ArrayList<MatchInfo>();
1061         // Matching metadata
1062         mkMatches.add(new MatchInfo(MatchFieldType.metadata, new BigInteger[] {
1063                 MetaDataUtil.getLportTagMetaData(LportTag),
1064                 MetaDataUtil.METADATA_MASK_LPORT_TAG }));
1065         mkMatches.add(new MatchInfo(MatchFieldType.tunnel_id, new BigInteger[] {BigInteger.valueOf(LportTag)}));
1066         return mkMatches;
1067     }
1068
1069
1070     private List<MatchInfo> getTunnelIdMatchForFilterEqualsLPortTag(int LportTag) {
1071         List<MatchInfo> mkMatches = new ArrayList<MatchInfo>();
1072         // Matching metadata
1073         mkMatches.add(new MatchInfo(MatchFieldType.tunnel_id, new BigInteger[] {
1074                 BigInteger.valueOf(LportTag)}));
1075         return mkMatches;
1076
1077
1078     }
1079
1080     private List<Instruction> getInstructionsDrop() {
1081         List<Instruction> mkInstructions = new ArrayList<Instruction>();
1082         List <Action> actionsInfos = new ArrayList <Action> ();
1083         actionsInfos.add(new ActionInfo(ActionType.drop_action, new String[]{}).buildAction());
1084         mkInstructions.add(ElanUtils.getWriteActionInstruction(actionsInfos));
1085         return mkInstructions;
1086     }
1087
1088 }