mappingservice/implementation/src/main/java/org/opendaylight/lispflowmapping/implementation/lisp/MapServer.java

   1 /*
   2  * Copyright (c) 2014, 2017 Contextream, Inc. 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
   9 package org.opendaylight.lispflowmapping.implementation.lisp;
  10
  11 import com.google.common.base.Preconditions;
  12 import com.google.common.collect.Maps;
  13 import com.google.common.collect.Sets;
  14 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  15 import java.net.InetAddress;
  16 import java.net.NetworkInterface;
  17 import java.net.SocketException;
  18 import java.util.ArrayList;
  19 import java.util.Arrays;
  20 import java.util.Enumeration;
  21 import java.util.HashSet;
  22 import java.util.Iterator;
  23 import java.util.List;
  24 import java.util.Map;
  25 import java.util.Objects;
  26 import java.util.Set;
  27 import java.util.concurrent.Executors;
  28 import java.util.concurrent.ScheduledExecutorService;
  29 import java.util.concurrent.ScheduledFuture;
  30 import java.util.concurrent.ThreadFactory;
  31 import java.util.concurrent.TimeUnit;
  32 import org.apache.commons.lang3.BooleanUtils;
  33 import org.opendaylight.controller.md.sal.binding.api.NotificationService;
  34 import org.opendaylight.lispflowmapping.config.ConfigIni;
  35 import org.opendaylight.lispflowmapping.implementation.util.LoggingUtil;
  36 import org.opendaylight.lispflowmapping.implementation.util.MSNotificationInputUtil;
  37 import org.opendaylight.lispflowmapping.interfaces.dao.SubKeys;
  38 import org.opendaylight.lispflowmapping.interfaces.dao.Subscriber;
  39 import org.opendaylight.lispflowmapping.interfaces.lisp.IMapNotifyHandler;
  40 import org.opendaylight.lispflowmapping.interfaces.lisp.IMapServerAsync;
  41 import org.opendaylight.lispflowmapping.interfaces.lisp.ISmrNotificationListener;
  42 import org.opendaylight.lispflowmapping.interfaces.lisp.SmrEvent;
  43 import org.opendaylight.lispflowmapping.interfaces.mappingservice.IMappingService;
  44 import org.opendaylight.lispflowmapping.lisp.authentication.LispAuthenticationUtil;
  45 import org.opendaylight.lispflowmapping.lisp.type.LispMessage;
  46 import org.opendaylight.lispflowmapping.lisp.type.MappingData;
  47 import org.opendaylight.lispflowmapping.lisp.util.LispAddressStringifier;
  48 import org.opendaylight.lispflowmapping.lisp.util.LispAddressUtil;
  49 import org.opendaylight.lispflowmapping.lisp.util.MapNotifyBuilderHelper;
  50 import org.opendaylight.lispflowmapping.lisp.util.MapRequestUtil;
  51 import org.opendaylight.lispflowmapping.lisp.util.MappingRecordUtil;
  52 import org.opendaylight.lispflowmapping.lisp.util.SourceDestKeyHelper;
  53 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.PortNumber;
  54 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.lisp.address.types.rev151105.lisp.address.address.SourceDestKey;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.inet.binary.types.rev160303.IpAddressBinary;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.MapRegister;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.SiteId;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.container.Eid;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.list.EidItem;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.eid.list.EidItemBuilder;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapnotifymessage.MapNotifyBuilder;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.authkey.container.MappingAuthkey;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.record.container.MappingRecord;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.record.list.MappingRecordItem;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.mapping.record.list.MappingRecordItemBuilder;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.maprequestnotification.MapRequestBuilder;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.transport.address.TransportAddress;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.lisp.proto.rev151105.transport.address.TransportAddressBuilder;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.MappingChanged;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.MappingOrigin;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.lfm.mappingservice.rev150906.OdlMappingserviceListener;
  72 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  73 import org.slf4j.Logger;
  74 import org.slf4j.LoggerFactory;
  75
  76 public class MapServer implements IMapServerAsync, OdlMappingserviceListener, ISmrNotificationListener {
  77
  78     protected static final Logger LOG = LoggerFactory.getLogger(MapServer.class);
  79     private static final byte[] ALL_ZEROES_XTR_ID = new byte[] {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ,0};
  80     private IMappingService mapService;
  81     private boolean subscriptionService;
  82     private IMapNotifyHandler notifyHandler;
  83     private NotificationService notificationService;
  84     private ListenerRegistration<MapServer> mapServerListenerRegistration;
  85     private SmrScheduler scheduler;
  86
  87     public MapServer(IMappingService mapService, boolean subscriptionService,
  88                      IMapNotifyHandler notifyHandler, NotificationService notificationService) {
  89         Preconditions.checkNotNull(mapService);
  90         this.mapService = mapService;
  91         this.subscriptionService = subscriptionService;
  92         this.notifyHandler = notifyHandler;
  93         this.notificationService = notificationService;
  94         if (notificationService != null) {
  95             notificationService.registerNotificationListener(this);
  96         }
  97         scheduler = new SmrScheduler();
  98     }
  99
 100     @Override
 101     public void setSubscriptionService(boolean subscriptionService) {
 102         this.subscriptionService = subscriptionService;
 103     }
 104
 105     @SuppressWarnings("unchecked")
 106     public void handleMapRegister(MapRegister mapRegister) {
 107         boolean mappingUpdated = false;
 108         boolean merge = ConfigIni.getInstance().mappingMergeIsSet() && mapRegister.isMergeEnabled();
 109         Set<Subscriber> subscribers = Sets.newConcurrentHashSet();
 110         MappingRecord oldMapping;
 111
 112         if (merge) {
 113             if (!mapRegister.isXtrSiteIdPresent() || mapRegister.getXtrId() == null) {
 114                 LOG.error("Merge bit is set in Map-Register, but xTR-ID is not present. Will not merge.");
 115                 merge = false;
 116             } else if (Arrays.equals(mapRegister.getXtrId().getValue(), ALL_ZEROES_XTR_ID)) {
 117                 LOG.warn("Merge bit is set in Map-Register, but xTR-ID is all zeroes.");
 118             }
 119         }
 120
 121         for (MappingRecordItem record : mapRegister.getMappingRecordItem()) {
 122             MappingRecord mapping = record.getMappingRecord();
 123             Eid eid = mapping.getEid();
 124             MappingData mappingData = new MappingData(mapping, System.currentTimeMillis());
 125             mappingData.setMergeEnabled(merge);
 126             mappingData.setXtrId(mapRegister.getXtrId());
 127
 128             oldMapping = getMappingRecord(mapService.getMapping(MappingOrigin.Southbound, eid));
 129             mapService.addMapping(MappingOrigin.Southbound, eid, getSiteId(mapRegister), mappingData);
 130             if (oldMapping != null
 131                     && MappingRecordUtil.isNegativeMapping(oldMapping)
 132                     && !oldMapping.getEid().equals(eid)) {
 133                 if (subscriptionService) {
 134                     // Here we save the subscribers of the OLD mapping before removing. We will add to this set the
 135                     // subscribers of the NEW mapping below (since the EIDs are different, the result of
 136                     // mappingChanged() will be true, and then send an SMR to all subscribers with the EID of the NEW
 137                     // mapping only.
 138                     Set<Subscriber> oldMappingSubscribers = getSubscribers(oldMapping.getEid());
 139                     if (oldMappingSubscribers != null) {
 140                         subscribers.addAll(oldMappingSubscribers);
 141                         LoggingUtil.logSubscribers(LOG, oldMapping.getEid(), subscribers);
 142                     }
 143                 }
 144                 mapService.removeMapping(MappingOrigin.Southbound, oldMapping.getEid());
 145             }
 146
 147             if (subscriptionService) {
 148                 MappingRecord newMapping = merge
 149                         ? getMappingRecord(mapService.getMapping(MappingOrigin.Southbound, eid)) : mapping;
 150
 151                 if (mappingChanged(oldMapping, newMapping)) {
 152                     if (LOG.isDebugEnabled()) {
 153                         LOG.debug("Mapping update occured for {} SMRs will be sent for its subscribers.",
 154                                 LispAddressStringifier.getString(eid));
 155                     }
 156                     Set<Subscriber> newMappingSubscribers = getSubscribers(eid);
 157                     if (oldMapping != null && !oldMapping.getEid().equals(eid)) {
 158                         newMappingSubscribers = addParentSubscribers(eid, newMappingSubscribers);
 159                     }
 160                     if (newMappingSubscribers != null) {
 161                         subscribers.addAll(newMappingSubscribers);
 162                         LoggingUtil.logSubscribers(LOG, eid, subscribers);
 163                     }
 164                     handleSmr(eid, subscribers);
 165                     mappingUpdated = true;
 166                 }
 167             }
 168         }
 169         if (BooleanUtils.isTrue(mapRegister.isWantMapNotify())) {
 170             LOG.trace("MapRegister wants MapNotify");
 171             MapNotifyBuilder builder = new MapNotifyBuilder();
 172             List<TransportAddress> rlocs = null;
 173             if (merge) {
 174                 Set<IpAddressBinary> notifyRlocs = new HashSet<IpAddressBinary>();
 175                 List<MappingRecordItem> mergedMappings = new ArrayList<MappingRecordItem>();
 176                 for (MappingRecordItem record : mapRegister.getMappingRecordItem()) {
 177                     MappingRecord mapping = record.getMappingRecord();
 178                     MappingRecord currentRecord = getMappingRecord(mapService.getMapping(MappingOrigin.Southbound,
 179                             mapping.getEid()));
 180                     mergedMappings.add(new MappingRecordItemBuilder().setMappingRecord(currentRecord).build());
 181                     Set<IpAddressBinary> sourceRlocs = (Set<IpAddressBinary>) mapService.getData(
 182                             MappingOrigin.Southbound, mapping.getEid(), SubKeys.SRC_RLOCS);
 183                     if (sourceRlocs != null) {
 184                         notifyRlocs.addAll(sourceRlocs);
 185                     }
 186                 }
 187                 MapNotifyBuilderHelper.setFromMapRegisterAndMappingRecordItems(builder, mapRegister, mergedMappings);
 188                 // send map-notify to merge group only when mapping record is changed
 189                 if (mappingUpdated) {
 190                     rlocs = getTransportAddresses(notifyRlocs);
 191                 }
 192             } else {
 193                 MapNotifyBuilderHelper.setFromMapRegister(builder, mapRegister);
 194             }
 195             List<MappingRecordItem> mappings = builder.getMappingRecordItem();
 196             if (mappings != null && mappings.get(0) != null && mappings.get(0).getMappingRecord() != null
 197                     && mappings.get(0).getMappingRecord().getEid() != null) {
 198                 MappingAuthkey authkey = mapService.getAuthenticationKey(mappings.get(0).getMappingRecord().getEid());
 199                 if (authkey != null) {
 200                     builder.setAuthenticationData(LispAuthenticationUtil.createAuthenticationData(builder.build(),
 201                             authkey.getKeyString()));
 202                 }
 203             }
 204             notifyHandler.handleMapNotify(builder.build(), rlocs);
 205         }
 206     }
 207
 208     private static List<TransportAddress> getTransportAddresses(Set<IpAddressBinary> addresses) {
 209         List<TransportAddress> rlocs = new ArrayList<TransportAddress>();
 210         for (IpAddressBinary address : addresses) {
 211             TransportAddressBuilder tab = new TransportAddressBuilder();
 212             tab.setIpAddress(address);
 213             tab.setPort(new PortNumber(LispMessage.PORT_NUM));
 214             rlocs.add(tab.build());
 215         }
 216         return rlocs;
 217     }
 218
 219     private static SiteId getSiteId(MapRegister mapRegister) {
 220         return (mapRegister.getSiteId() != null) ? new SiteId(mapRegister.getSiteId()) : null;
 221     }
 222
 223     private static MappingRecord getMappingRecord(MappingData mappingData) {
 224         return (mappingData != null) ? mappingData.getRecord() : null;
 225     }
 226
 227     @Override
 228     public void onMappingChanged(MappingChanged notification) {
 229         LOG.trace("MappingChanged event of type: `{}'", notification.getChangeType());
 230         if (subscriptionService) {
 231             Eid eid = notification.getMappingRecord().getEid();
 232             Set<Subscriber> subscribers = MSNotificationInputUtil.toSubscriberSet(notification.getSubscriberItem());
 233             LoggingUtil.logSubscribers(LOG, eid, subscribers);
 234             if (mapService.isMaster()) {
 235                 sendSmrs(eid, subscribers);
 236                 if (eid.getAddress() instanceof SourceDestKey) {
 237                     Set<Subscriber> dstSubscribers = MSNotificationInputUtil.toSubscriberSetFromDst(
 238                             notification.getDstSubscriberItem());
 239                     LoggingUtil.logSubscribers(LOG, SourceDestKeyHelper.getDstBinary(eid), dstSubscribers);
 240                     sendSmrs(SourceDestKeyHelper.getDstBinary(eid), dstSubscribers);
 241                 }
 242             }
 243         }
 244     }
 245
 246     private static boolean mappingChanged(MappingRecord oldMapping, MappingRecord newMapping) {
 247         // We only check for fields we care about
 248         // XXX: This code needs to be checked and updated when the YANG model for MappingRecord is modified
 249         Preconditions.checkNotNull(newMapping, "The new mapping should never be null");
 250         if (oldMapping == null) {
 251             LOG.trace("mappingChanged(): old mapping is null");
 252             return true;
 253         } else if (!Objects.equals(oldMapping.getEid(), newMapping.getEid())) {
 254             LOG.trace("mappingChanged(): EID");
 255             return true;
 256         } else if (!Objects.equals(oldMapping.getLocatorRecord(), newMapping.getLocatorRecord())) {
 257             LOG.trace("mappingChanged(): RLOC");
 258             return true;
 259         } else if (!Objects.equals(oldMapping.getAction(), newMapping.getAction())) {
 260             LOG.trace("mappingChanged(): action");
 261             return true;
 262         } else if (!Objects.equals(oldMapping.getRecordTtl(), newMapping.getRecordTtl())) {
 263             LOG.trace("mappingChanged(): TTL");
 264             return true;
 265         } else if (!Objects.equals(oldMapping.getMapVersion(), newMapping.getMapVersion())) {
 266             LOG.trace("mappingChanged(): mapping version");
 267             return true;
 268         }
 269         return false;
 270     }
 271
 272     private void handleSmr(Eid eid, Set<Subscriber> subscribers) {
 273         sendSmrs(eid, subscribers);
 274
 275         // For SrcDst LCAF also send SMRs to Dst prefix
 276         if (eid.getAddress() instanceof SourceDestKey) {
 277             Eid dstAddr = SourceDestKeyHelper.getDstBinary(eid);
 278             Set<Subscriber> dstSubs = getSubscribers(dstAddr);
 279             sendSmrs(dstAddr, dstSubs);
 280         }
 281     }
 282
 283     private void sendSmrs(Eid eid, Set<Subscriber> subscribers) {
 284         if (subscribers == null) {
 285             return;
 286         }
 287         final MapRequestBuilder mrb = MapRequestUtil.prepareSMR(eid, LispAddressUtil.toRloc(getLocalAddress()));
 288         LOG.trace("Built SMR packet: " + mrb.build().toString());
 289
 290         scheduler.scheduleSmrs(mrb, subscribers.iterator());
 291     }
 292
 293     @SuppressWarnings("unchecked")
 294     private Set<Subscriber> getSubscribers(Eid address) {
 295         return (Set<Subscriber>) mapService.getData(MappingOrigin.Southbound, address, SubKeys.SUBSCRIBERS);
 296     }
 297
 298     private Set<Subscriber> addParentSubscribers(Eid eid, Set<Subscriber> subscribers) {
 299         Eid parentPrefix = mapService.getParentPrefix(eid);
 300         if (parentPrefix == null) {
 301             return subscribers;
 302         }
 303
 304         Set<Subscriber> parentSubscribers = getSubscribers(parentPrefix);
 305         if (parentSubscribers != null) {
 306             if (subscribers != null) {
 307                 subscribers.addAll(parentSubscribers);
 308             } else {
 309                 subscribers = parentSubscribers;
 310             }
 311         }
 312         return subscribers;
 313     }
 314
 315     private void addSubscribers(Eid address, Set<Subscriber> subscribers) {
 316         mapService.addData(MappingOrigin.Southbound, address, SubKeys.SUBSCRIBERS, subscribers);
 317     }
 318
 319     private static InetAddress getLocalAddress() {
 320         try {
 321             Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
 322             while (interfaces.hasMoreElements()) {
 323                 NetworkInterface current = interfaces.nextElement();
 324                 LOG.trace("Interface " + current.toString());
 325                 if (!current.isUp() || current.isLoopback() || current.isVirtual()) {
 326                     continue;
 327                 }
 328                 Enumeration<InetAddress> addresses = current.getInetAddresses();
 329                 while (addresses.hasMoreElements()) {
 330                     InetAddress currentAddr = addresses.nextElement();
 331                     // Skip loopback and link local addresses
 332                     if (currentAddr.isLoopbackAddress() || currentAddr.isLinkLocalAddress()) {
 333                         continue;
 334                     }
 335                     LOG.debug(currentAddr.getHostAddress());
 336                     return currentAddr;
 337                 }
 338             }
 339         } catch (SocketException se) {
 340             LOG.debug("Caught socket exception", se);
 341         }
 342         return null;
 343     }
 344
 345     @Override
 346     public void onSmrInvokedReceived(SmrEvent event) {
 347         scheduler.smrReceived(event);
 348     }
 349
 350     /**
 351      * Task scheduler is responsible for resending SMR messages to a subscriber (xTR)
 352      * {@value ConfigIni#LISP_SMR_RETRY_COUNT} times, or until {@link ISmrNotificationListener#onSmrInvokedReceived}
 353      * is triggered.
 354      */
 355     private class SmrScheduler {
 356         final int cpuCores = Runtime.getRuntime().availableProcessors();
 357         private final ThreadFactory threadFactory = new ThreadFactoryBuilder()
 358                 .setNameFormat("smr-executor-%d").build();
 359         private final ScheduledExecutorService executor = Executors.newScheduledThreadPool(cpuCores * 2, threadFactory);
 360         private final Map<Eid, Map<Subscriber, ScheduledFuture<?>>> eidFutureMap = Maps.newConcurrentMap();
 361
 362         void scheduleSmrs(MapRequestBuilder mrb, Iterator<Subscriber> subscribers) {
 363             final Eid srcEid = mrb.getSourceEid().getEid();
 364             cancelExistingFuturesForEid(srcEid);
 365
 366             final Map<Subscriber, ScheduledFuture<?>> subscriberFutureMap = Maps.newConcurrentMap();
 367
 368             // Using Iterator ensures that we don't get a ConcurrentModificationException when removing a Subscriber
 369             // from a Set.
 370             while (subscribers.hasNext()) {
 371                 Subscriber subscriber = subscribers.next();
 372                 if (subscriber.timedOut()) {
 373                     LOG.debug("Lazy removing expired subscriber entry " + subscriber.getString());
 374                     subscribers.remove();
 375                 } else {
 376                     final ScheduledFuture<?> future = executor.scheduleAtFixedRate(new CancellableRunnable(
 377                             mrb, subscriber), 0L, ConfigIni.getInstance().getSmrTimeout(), TimeUnit.MILLISECONDS);
 378                     subscriberFutureMap.put(subscriber, future);
 379                 }
 380             }
 381
 382             if (subscriberFutureMap.isEmpty()) {
 383                 return;
 384             }
 385             eidFutureMap.put(srcEid, subscriberFutureMap);
 386         }
 387
 388         void smrReceived(SmrEvent event) {
 389             final List<Subscriber> subscriberList = event.getSubscriberList();
 390             for (Subscriber subscriber : subscriberList) {
 391                 LOG.trace("SMR-invoked event, EID {}, subscriber {}", LispAddressStringifier.getString(event.getEid()),
 392                         subscriber.getString());
 393                 final Map<Subscriber, ScheduledFuture<?>> subscriberFutureMap = eidFutureMap.get(event.getEid());
 394                 if (subscriberFutureMap != null) {
 395                     final ScheduledFuture<?> future = subscriberFutureMap.get(subscriber);
 396                     if (future != null && !future.isCancelled()) {
 397                         future.cancel(true);
 398                         LOG.debug("SMR-invoked MapRequest received, scheduled task for subscriber {}, EID {} with"
 399                                 + " nonce {} has been cancelled", subscriber.getString(),
 400                                 LispAddressStringifier.getString(event.getEid()), event.getNonce());
 401                         subscriberFutureMap.remove(subscriber);
 402                     }
 403                     if (subscriberFutureMap.isEmpty()) {
 404                         eidFutureMap.remove(event.getEid());
 405                     }
 406                 }
 407             }
 408         }
 409
 410         private void cancelExistingFuturesForEid(Eid eid) {
 411             synchronized (eidFutureMap) {
 412                 if (eidFutureMap.containsKey(eid)) {
 413                     final Map<Subscriber, ScheduledFuture<?>> subscriberFutureMap = eidFutureMap.get(eid);
 414                     Iterator<Subscriber> oldSubscribers = subscriberFutureMap.keySet().iterator();
 415                     while (oldSubscribers.hasNext()) {
 416                         Subscriber subscriber = oldSubscribers.next();
 417                         ScheduledFuture<?> subscriberFuture = subscriberFutureMap.get(subscriber);
 418                         subscriberFuture.cancel(true);
 419                     }
 420                     eidFutureMap.remove(eid);
 421                 }
 422             }
 423         }
 424
 425         private final class CancellableRunnable implements Runnable {
 426             private MapRequestBuilder mrb;
 427             private Subscriber subscriber;
 428             private int executionCount = 1;
 429
 430             CancellableRunnable(MapRequestBuilder mrb, Subscriber subscriber) {
 431                 this.mrb = mrb;
 432                 this.subscriber = subscriber;
 433             }
 434
 435             @SuppressWarnings("checkstyle:IllegalCatch")
 436             @Override
 437             public void run() {
 438                 final Eid srcEid = mrb.getSourceEid().getEid();
 439
 440                 try {
 441                     // The address stored in the SMR's EID record is used as Source EID in the SMR-invoked
 442                     // Map-Request. To ensure consistent behavior it is set to the value used to originally request
 443                     // a given mapping.
 444                     if (executionCount <= ConfigIni.getInstance().getSmrRetryCount()) {
 445                         synchronized (mrb) {
 446                             mrb.setEidItem(new ArrayList<EidItem>());
 447                             mrb.getEidItem().add(new EidItemBuilder().setEid(subscriber.getSrcEid()).build());
 448                             notifyHandler.handleSMR(mrb.build(), subscriber.getSrcRloc());
 449                             if (LOG.isTraceEnabled()) {
 450                                 LOG.trace("Attempt #{} to send SMR to subscriber {} for EID {}",
 451                                         executionCount,
 452                                         subscriber.getString(),
 453                                         LispAddressStringifier.getString(mrb.getSourceEid().getEid()));
 454                             }
 455                         }
 456                     } else {
 457                         LOG.trace("Cancelling execution of a SMR Map-Request after {} failed attempts.",
 458                                 executionCount - 1);
 459                         cancelAndRemove(subscriber, srcEid);
 460                         return;
 461                     }
 462                 } catch (Exception e) {
 463                     LOG.error("Errors encountered while handling SMR:", e);
 464                     cancelAndRemove(subscriber, srcEid);
 465                     return;
 466                 }
 467                 executionCount++;
 468             }
 469
 470             private void cancelAndRemove(Subscriber subscriber, Eid eid) {
 471                 final Map<Subscriber, ScheduledFuture<?>> subscriberFutureMap = eidFutureMap.get(eid);
 472                 if (subscriberFutureMap == null) {
 473                     LOG.warn("Couldn't find subscriber {} in SMR scheduler internal list", subscriber);
 474                     return;
 475                 }
 476
 477                 if (subscriberFutureMap.containsKey(subscriber)) {
 478                     ScheduledFuture<?> eidFuture = subscriberFutureMap.get(subscriber);
 479                     subscriberFutureMap.remove(subscriber);
 480                     eidFuture.cancel(false);
 481                 }
 482                 if (subscriberFutureMap.isEmpty()) {
 483                     eidFutureMap.remove(eid);
 484                 }
 485             }
 486         }
 487     }
 488 }