bgp/rib-impl/src/main/java/org/opendaylight/protocol/bgp/rib/impl/BGPPeer.java

   1 /*
   2  * Copyright (c) 2014 Cisco Systems, 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 package org.opendaylight.protocol.bgp.rib.impl;
   9
  10 import static org.opendaylight.protocol.bgp.rib.impl.AdjRibInWriter.isAnnounceNone;
  11 import static org.opendaylight.protocol.bgp.rib.impl.AdjRibInWriter.isLearnNone;
  12
  13 import com.google.common.base.MoreObjects;
  14 import com.google.common.base.MoreObjects.ToStringHelper;
  15 import com.google.common.base.Preconditions;
  16 import com.google.common.net.InetAddresses;
  17 import java.util.ArrayList;
  18 import java.util.Arrays;
  19 import java.util.HashMap;
  20 import java.util.HashSet;
  21 import java.util.List;
  22 import java.util.Map;
  23 import java.util.Optional;
  24 import java.util.Set;
  25 import java.util.stream.Collectors;
  26 import javax.annotation.concurrent.GuardedBy;
  27 import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeMXBean;
  28 import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeRegistration;
  29 import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeRegistrator;
  30 import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpPeerState;
  31 import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpSessionState;
  32 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;
  33 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;
  34 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
  35 import org.opendaylight.controller.md.sal.dom.api.DOMTransactionChain;
  36 import org.opendaylight.controller.sal.binding.api.BindingAwareBroker.RoutedRpcRegistration;
  37 import org.opendaylight.controller.sal.binding.api.RpcProviderRegistry;
  38 import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
  39 import org.opendaylight.protocol.bgp.parser.BGPError;
  40 import org.opendaylight.protocol.bgp.parser.impl.message.update.LocalPreferenceAttributeParser;
  41 import org.opendaylight.protocol.bgp.parser.spi.MessageUtil;
  42 import org.opendaylight.protocol.bgp.rib.impl.spi.RIB;
  43 import org.opendaylight.protocol.bgp.rib.impl.spi.RIBSupportContext;
  44 import org.opendaylight.protocol.bgp.rib.impl.stats.peer.BGPPeerStats;
  45 import org.opendaylight.protocol.bgp.rib.impl.stats.peer.BGPPeerStatsImpl;
  46 import org.opendaylight.protocol.bgp.rib.impl.stats.peer.BGPSessionStats;
  47 import org.opendaylight.protocol.bgp.rib.spi.BGPSession;
  48 import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
  49 import org.opendaylight.protocol.bgp.rib.spi.BGPTerminationReason;
  50 import org.opendaylight.protocol.bgp.rib.spi.IdentifierUtils;
  51 import org.opendaylight.protocol.bgp.rib.spi.Peer;
  52 import org.opendaylight.protocol.bgp.rib.spi.RouterIds;
  53 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.Ipv4Prefix;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.DestinationIpv4Builder;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.destination.ipv4.Ipv4Prefixes;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.destination.ipv4.Ipv4PrefixesBuilder;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationIpv4CaseBuilder;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.Attributes;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.AttributesBuilder;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.RouteRefresh;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.mp.capabilities.add.path.capability.AddressFamilies;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpReachNlri;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpReachNlriBuilder;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlri;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlriBuilder;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.reach.nlri.AdvertizedRoutesBuilder;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.unreach.nlri.WithdrawnRoutesBuilder;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.peer.rpc.rev160322.BgpPeerRpcService;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.peer.rpc.rev160322.PeerContext;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerId;
  72 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerRole;
  73 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.SimpleRoutingPolicy;
  74 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.PeerKey;
  75 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
  76 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
  77 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv4AddressFamily;
  78 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
  79 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.UnicastSubsequentAddressFamily;
  80 import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
  81 import org.opendaylight.yangtools.yang.binding.Notification;
  82 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  83 import org.slf4j.Logger;
  84 import org.slf4j.LoggerFactory;
  85
  86 /**
  87  * Class representing a peer. We have a single instance for each peer, which provides translation from BGP events into
  88  * RIB actions.
  89  */
  90 public class BGPPeer implements BGPSessionListener, Peer, AutoCloseable, BGPPeerRuntimeMXBean, TransactionChainListener {
  91
  92     private static final Logger LOG = LoggerFactory.getLogger(BGPPeer.class);
  93
  94     @GuardedBy("this")
  95     private final Set<TablesKey> tables = new HashSet<>();
  96     @GuardedBy("this")
  97     private BGPSession session;
  98     @GuardedBy("this")
  99     private byte[] rawIdentifier;
 100     @GuardedBy("this")
 101     private DOMTransactionChain chain;
 102     @GuardedBy("this")
 103     private AdjRibInWriter ribWriter;
 104     @GuardedBy("this")
 105     private EffectiveRibInWriter effRibInWriter;
 106
 107     private final RIB rib;
 108     private final String name;
 109     private BGPPeerRuntimeRegistrator registrator;
 110     private BGPPeerRuntimeRegistration runtimeReg;
 111     private final Map<TablesKey, AdjRibOutListener> adjRibOutListenerSet = new HashMap();
 112     private final RpcProviderRegistry rpcRegistry;
 113     private RoutedRpcRegistration<BgpPeerRpcService> rpcRegistration;
 114     private final PeerRole peerRole;
 115     private final Optional<SimpleRoutingPolicy> simpleRoutingPolicy;
 116     private final BGPPeerStats peerStats;
 117
 118     public BGPPeer(final String name, final RIB rib, final PeerRole role, final SimpleRoutingPolicy peerStatus, final RpcProviderRegistry rpcRegistry) {
 119         this.peerRole = role;
 120         this.simpleRoutingPolicy = Optional.ofNullable(peerStatus);
 121         this.rib = Preconditions.checkNotNull(rib);
 122         this.name = name;
 123         this.rpcRegistry = rpcRegistry;
 124         this.peerStats = new BGPPeerStatsImpl(this.name, this.tables);
 125
 126         // add current peer to "configured BGP peer" stats
 127         this.rib.getRenderStats().getConfiguredPeerCounter().increaseCount();
 128         this.chain = rib.createPeerChain(this);
 129     }
 130
 131     public BGPPeer(final String name, final RIB rib, final PeerRole role, final RpcProviderRegistry rpcRegistry) {
 132         this(name, rib, role, null, rpcRegistry);
 133     }
 134
 135     public void instantiateServiceInstance() {
 136         this.ribWriter = AdjRibInWriter.create(rib.getYangRibId(), this.peerRole, this.simpleRoutingPolicy, this.chain);
 137     }
 138
 139     @Override
 140     public synchronized void close() {
 141         releaseConnection();
 142         this.chain.close();
 143     }
 144
 145     @Override
 146     public void onMessage(final BGPSession session, final Notification msg) throws BGPDocumentedException {
 147         if (!(msg instanceof Update) && !(msg instanceof RouteRefresh)) {
 148             LOG.info("Ignoring unhandled message class {}", msg.getClass());
 149             return;
 150         }
 151         if (msg instanceof Update) {
 152             onUpdateMessage((Update) msg);
 153         } else {
 154             onRouteRefreshMessage((RouteRefresh) msg, session);
 155         }
 156     }
 157
 158     private void onRouteRefreshMessage(final RouteRefresh message, final BGPSession session) {
 159         final Class<? extends AddressFamily> rrAfi = message.getAfi();
 160         final Class<? extends SubsequentAddressFamily> rrSafi = message.getSafi();
 161
 162         final TablesKey key = new TablesKey(rrAfi, rrSafi);
 163         final AdjRibOutListener listener = this.adjRibOutListenerSet.get(key);
 164         if (listener != null) {
 165             listener.close();
 166             this.adjRibOutListenerSet.remove(key);
 167             createAdjRibOutListener(RouterIds.createPeerId(session.getBgpId()), key, listener.isMpSupported());
 168         } else {
 169             LOG.info("Ignoring RouteRefresh message. Afi/Safi is not supported: {}, {}.", rrAfi, rrSafi);
 170         }
 171     }
 172
 173     /**
 174      * Check for presence of well known mandatory attribute LOCAL_PREF in Update message
 175      *
 176      * @param message Update message
 177      * @throws BGPDocumentedException
 178      */
 179     private void checkMandatoryAttributesPresence(final Update message) throws BGPDocumentedException {
 180         if (MessageUtil.isAnyNlriPresent(message)) {
 181             final Attributes attrs = message.getAttributes();
 182             if (this.peerRole == PeerRole.Ibgp && (attrs == null || attrs.getLocalPref() == null)) {
 183                 throw new BGPDocumentedException(BGPError.MANDATORY_ATTR_MISSING_MSG + "LOCAL_PREF",
 184                         BGPError.WELL_KNOWN_ATTR_MISSING,
 185                         new byte[] { LocalPreferenceAttributeParser.TYPE });
 186             }
 187         }
 188     }
 189
 190     /**
 191      * Process Update message received.
 192      * Calls {@link #checkMandatoryAttributesPresence(Update)} to check for presence of mandatory attributes.
 193      *
 194      * @param message Update message
 195      * @throws BGPDocumentedException
 196      */
 197     private void onUpdateMessage(final Update message) throws BGPDocumentedException {
 198         checkMandatoryAttributesPresence(message);
 199
 200         // update AdjRibs
 201         final Attributes attrs = message.getAttributes();
 202         MpReachNlri mpReach = null;
 203         final boolean isAnyNlriAnnounced = message.getNlri() != null;
 204         if (isAnyNlriAnnounced) {
 205             mpReach = prefixesToMpReach(message);
 206         } else {
 207             mpReach = MessageUtil.getMpReachNlri(attrs);
 208         }
 209         if (mpReach != null) {
 210             this.ribWriter.updateRoutes(mpReach, nextHopToAttribute(attrs, mpReach));
 211         }
 212         MpUnreachNlri mpUnreach = null;
 213         if (message.getWithdrawnRoutes() != null) {
 214             mpUnreach = prefixesToMpUnreach(message, isAnyNlriAnnounced);
 215         } else {
 216             mpUnreach = MessageUtil.getMpUnreachNlri(attrs);
 217         }
 218         if (mpUnreach != null) {
 219             this.ribWriter.removeRoutes(mpUnreach);
 220         }
 221     }
 222
 223     private static Attributes nextHopToAttribute(final Attributes attrs, final MpReachNlri mpReach) {
 224         if (attrs.getCNextHop() == null && mpReach.getCNextHop() != null) {
 225             final AttributesBuilder attributesBuilder = new AttributesBuilder(attrs);
 226             attributesBuilder.setCNextHop(mpReach.getCNextHop());
 227             return attributesBuilder.build();
 228         }
 229         return attrs;
 230     }
 231
 232     /**
 233      * Creates MPReach for the prefixes to be handled in the same way as linkstate routes
 234      *
 235      * @param message Update message containing prefixes in NLRI
 236      * @return MpReachNlri with prefixes from the nlri field
 237      */
 238     private static MpReachNlri prefixesToMpReach(final Update message) {
 239         final List<Ipv4Prefixes> prefixes = new ArrayList<>();
 240         for (final Ipv4Prefix p : message.getNlri().getNlri()) {
 241             prefixes.add(new Ipv4PrefixesBuilder().setPrefix(p).build());
 242         }
 243         final MpReachNlriBuilder b = new MpReachNlriBuilder().setAfi(Ipv4AddressFamily.class).setSafi(
 244                 UnicastSubsequentAddressFamily.class).setAdvertizedRoutes(
 245                         new AdvertizedRoutesBuilder().setDestinationType(
 246                                 new DestinationIpv4CaseBuilder().setDestinationIpv4(
 247                                         new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build()).build()).build());
 248         if (message.getAttributes() != null) {
 249             b.setCNextHop(message.getAttributes().getCNextHop());
 250         }
 251         return b.build();
 252     }
 253
 254     /**
 255      * Create MPUnreach for the prefixes to be handled in the same way as linkstate routes
 256      *
 257      * @param message Update message containing withdrawn routes
 258      * @param isAnyNlriAnnounced
 259      * @return MpUnreachNlri with prefixes from the withdrawn routes field
 260      */
 261     private static MpUnreachNlri prefixesToMpUnreach(final Update message, final boolean isAnyNlriAnnounced) {
 262         final List<Ipv4Prefixes> prefixes = new ArrayList<>();
 263         for (final Ipv4Prefix p : message.getWithdrawnRoutes().getWithdrawnRoutes()) {
 264             boolean nlriAnounced = false;
 265             if(isAnyNlriAnnounced) {
 266                 nlriAnounced = message.getNlri().getNlri().contains(p);
 267             }
 268
 269             if(!nlriAnounced) {
 270                 prefixes.add(new Ipv4PrefixesBuilder().setPrefix(p).build());
 271             }
 272         }
 273         return new MpUnreachNlriBuilder().setAfi(Ipv4AddressFamily.class).setSafi(UnicastSubsequentAddressFamily.class).setWithdrawnRoutes(
 274                 new WithdrawnRoutesBuilder().setDestinationType(
 275                         new org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.update.attributes.mp.unreach.nlri.withdrawn.routes.destination.type.DestinationIpv4CaseBuilder().setDestinationIpv4(
 276                                 new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build()).build()).build()).build();
 277     }
 278
 279     @Override
 280     public synchronized void onSessionUp(final BGPSession session) {
 281         final List<AddressFamilies> addPathTablesType = session.getAdvertisedAddPathTableTypes();
 282         LOG.info("Session with peer {} went up with tables {} and Add Path tables {}", this.name, addPathTablesType,
 283                 session.getAdvertisedAddPathTableTypes());
 284         this.session = session;
 285
 286         this.rawIdentifier = InetAddresses.forString(session.getBgpId().getValue()).getAddress();
 287         final PeerId peerId = RouterIds.createPeerId(session.getBgpId());
 288
 289         this.tables.addAll(this.session.getAdvertisedTableTypes().stream().map(t -> new TablesKey(t.getAfi(), t.getSafi())).collect(Collectors.toList()));
 290         final boolean announceNone = isAnnounceNone(this.simpleRoutingPolicy);
 291         if(!announceNone) {
 292             createAdjRibOutListener(peerId);
 293         }
 294         addBgp4Support(peerId, announceNone);
 295
 296         if(!isLearnNone(this.simpleRoutingPolicy)) {
 297             final YangInstanceIdentifier peerIId = this.rib.getYangRibId().node(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer.QNAME).node(IdentifierUtils.domPeerId(peerId));
 298             this.effRibInWriter = EffectiveRibInWriter.create(this.rib.getService(), this.rib.createPeerChain(this), peerIId, this.rib.getImportPolicyPeerTracker(),
 299                     this.rib.getRibSupportContext(), this.peerRole, this.peerStats.getEffectiveRibInRouteCounters(), this.peerStats.getAdjRibInRouteCounters());
 300         }
 301         this.ribWriter = this.ribWriter.transform(peerId, this.rib.getRibSupportContext(), this.tables, addPathTablesType);
 302
 303         // register BGP Peer stats
 304         this.peerStats.getSessionEstablishedCounter().increaseCount();
 305         if (this.registrator != null) {
 306             this.runtimeReg = this.registrator.register(this);
 307         }
 308
 309         if (this.rpcRegistry != null) {
 310             this.rpcRegistration = this.rpcRegistry.addRoutedRpcImplementation(BgpPeerRpcService.class, new BgpPeerRpc(session, this.tables));
 311             final KeyedInstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer, PeerKey> path =
 312                     this.rib.getInstanceIdentifier().child(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer.class, new PeerKey(peerId));
 313             this.rpcRegistration.registerPath(PeerContext.class, path);
 314         }
 315
 316         this.rib.getRenderStats().getConnectedPeerCounter().increaseCount();
 317     }
 318
 319     private void createAdjRibOutListener(final PeerId peerId) {
 320         this.tables.forEach(key->createAdjRibOutListener(peerId, key, true));
 321     }
 322
 323     //try to add a support for old-school BGP-4, if peer did not advertise IPv4-Unicast MP capability
 324     private void addBgp4Support(final PeerId peerId, final boolean announceNone) {
 325         final TablesKey key = new TablesKey(Ipv4AddressFamily.class, UnicastSubsequentAddressFamily.class);
 326         if (this.tables.add(key) && !announceNone) {
 327             createAdjRibOutListener(peerId, key, false);
 328         }
 329     }
 330
 331     private void createAdjRibOutListener(final PeerId peerId, final TablesKey key, final boolean mpSupport) {
 332         final RIBSupportContext context = this.rib.getRibSupportContext().getRIBSupportContext(key);
 333
 334         // not particularly nice
 335         if (context != null && this.session instanceof BGPSessionImpl) {
 336             this.adjRibOutListenerSet.put(key, AdjRibOutListener.create(peerId, key, this.rib.getYangRibId(), this.rib.getCodecsRegistry(),
 337                     context.getRibSupport(), this.rib.getService(), ((BGPSessionImpl) this.session).getLimiter(), mpSupport, this.peerStats.getAdjRibOutRouteCounters().init(key)));
 338         }
 339     }
 340
 341     private void cleanup() {
 342         // FIXME: BUG-196: support graceful
 343         this.adjRibOutListenerSet.values().forEach(AdjRibOutListener::close);
 344         this.adjRibOutListenerSet.clear();
 345         if (this.effRibInWriter != null) {
 346             this.effRibInWriter.close();
 347         }
 348         if(this.ribWriter != null) {
 349             this.ribWriter.removePeer();
 350         }
 351         this.tables.clear();
 352     }
 353
 354     @Override
 355     public void onSessionDown(final BGPSession session, final Exception e) {
 356         if(e.getMessage().equals(BGPSessionImpl.END_OF_INPUT)) {
 357             LOG.info("Session with peer {} went down", this.name);
 358         } else {
 359             LOG.info("Session with peer {} went down", this.name, e);
 360         }
 361         releaseConnection();
 362     }
 363
 364     @Override
 365     public void onSessionTerminated(final BGPSession session, final BGPTerminationReason cause) {
 366         LOG.info("Session with peer {} terminated: {}", this.name, cause);
 367         releaseConnection();
 368     }
 369
 370     @Override
 371     public String toString() {
 372         return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();
 373     }
 374
 375     protected ToStringHelper addToStringAttributes(final ToStringHelper toStringHelper) {
 376         toStringHelper.add("name", this.name);
 377         toStringHelper.add("tables", this.tables);
 378         return toStringHelper;
 379     }
 380
 381     @Override
 382     public String getName() {
 383         return this.name;
 384     }
 385
 386     @Override
 387     @GuardedBy("this")
 388     public synchronized void releaseConnection() {
 389         if (this.rpcRegistration != null) {
 390             this.rpcRegistration.close();
 391         }
 392         addPeerToDisconnectedSharedList();
 393         cleanup();
 394         dropConnection();
 395     }
 396
 397     private void addPeerToDisconnectedSharedList() {
 398         if(this.session != null) {
 399             this.rib.getCacheDisconnectedPeers().insertDesconectedPeer(this.session.getBgpId());
 400         }
 401     }
 402
 403     private void dropConnection() {
 404         if (this.runtimeReg != null) {
 405             this.runtimeReg.close();
 406             this.runtimeReg = null;
 407         }
 408         if (this.session != null) {
 409             try {
 410                 this.session.close();
 411             } catch (final Exception e) {
 412                 LOG.warn("Error closing session with peer", e);
 413             }
 414             this.session = null;
 415
 416             this.rib.getRenderStats().getConnectedPeerCounter().decreaseCount();
 417         }
 418     }
 419
 420     @Override
 421     public boolean isSessionActive() {
 422         return this.session != null;
 423     }
 424
 425     @Override
 426     public synchronized byte[] getRawIdentifier() {
 427         return Arrays.copyOf(this.rawIdentifier, this.rawIdentifier.length);
 428     }
 429
 430     @Override
 431     public void resetSession() {
 432         releaseConnection();
 433     }
 434
 435     @Override
 436     public void resetStats() {
 437         if (this.session instanceof BGPSessionStats) {
 438             ((BGPSessionStats) this.session).resetBgpSessionStats();
 439         }
 440     }
 441
 442     public synchronized void registerRootRuntimeBean(final BGPPeerRuntimeRegistrator registrator) {
 443         this.registrator = registrator;
 444     }
 445
 446     @Override
 447     public BgpSessionState getBgpSessionState() {
 448         if (this.session instanceof BGPSessionStats) {
 449             return ((BGPSessionStats) this.session).getBgpSessionState();
 450         }
 451         return new BgpSessionState();
 452     }
 453
 454     @Override
 455     public synchronized BgpPeerState getBgpPeerState() {
 456         return this.peerStats.getBgpPeerState();
 457     }
 458
 459     @Override
 460     public void onTransactionChainFailed(final TransactionChain<?, ?> chain, final AsyncTransaction<?, ?> transaction, final Throwable cause) {
 461         LOG.error("Transaction chain failed.", cause);
 462         this.chain.close();
 463         this.chain = this.rib.createPeerChain(this);
 464         this.ribWriter = AdjRibInWriter.create(this.rib.getYangRibId(), this.peerRole, this.simpleRoutingPolicy, this.chain);
 465         releaseConnection();
 466     }
 467
 468     @Override
 469     public void onTransactionChainSuccessful(final TransactionChain<?, ?> chain) {
 470         LOG.debug("Transaction chain {} successfull.", chain);
 471     }
 472
 473     @Override
 474     public void markUptodate(final TablesKey tablesKey) {
 475         this.ribWriter.markTableUptodate(tablesKey);
 476     }
 477 }