BGPCEP-754: Rework EffectiveRibInWriter
[bgpcep.git] / bgp / rib-impl / src / main / java / org / opendaylight / protocol / bgp / rib / impl / BGPPeer.java
index 57d2d38ca953382ef2537c16e4986e9713c43413..b5cb557f3c3325bf13e149ba7763641a093fc62d 100644 (file)
@@ -7,57 +7,88 @@
  */
 package org.opendaylight.protocol.bgp.rib.impl;
 
+import static java.util.Objects.requireNonNull;
+
 import com.google.common.base.MoreObjects;
 import com.google.common.base.MoreObjects.ToStringHelper;
-import com.google.common.base.Preconditions;
-import com.google.common.collect.Lists;
+import com.google.common.base.Objects;
+import com.google.common.collect.ImmutableMap;
 import com.google.common.net.InetAddresses;
+import com.google.common.util.concurrent.Futures;
+import com.google.common.util.concurrent.ListenableFuture;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
+import java.util.stream.Collectors;
 import javax.annotation.concurrent.GuardedBy;
-import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeMXBean;
-import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeRegistration;
-import org.opendaylight.controller.config.yang.bgp.rib.impl.BGPPeerRuntimeRegistrator;
-import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpPeerState;
-import org.opendaylight.controller.config.yang.bgp.rib.impl.BgpSessionState;
-import org.opendaylight.controller.config.yang.bgp.rib.impl.RouteTable;
 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;
 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;
 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
 import org.opendaylight.controller.md.sal.dom.api.DOMTransactionChain;
-import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionStatistics;
+import org.opendaylight.controller.sal.binding.api.BindingAwareBroker.RoutedRpcRegistration;
+import org.opendaylight.controller.sal.binding.api.RpcProviderRegistry;
+import org.opendaylight.protocol.bgp.parser.BGPDocumentedException;
+import org.opendaylight.protocol.bgp.parser.BGPError;
+import org.opendaylight.protocol.bgp.parser.impl.message.update.LocalPreferenceAttributeParser;
+import org.opendaylight.protocol.bgp.parser.spi.MessageUtil;
 import org.opendaylight.protocol.bgp.rib.impl.spi.RIB;
 import org.opendaylight.protocol.bgp.rib.impl.spi.RIBSupportContext;
+import org.opendaylight.protocol.bgp.rib.impl.state.BGPPeerStateImpl;
+import org.opendaylight.protocol.bgp.rib.impl.state.BGPSessionStateProvider;
 import org.opendaylight.protocol.bgp.rib.spi.BGPSession;
 import org.opendaylight.protocol.bgp.rib.spi.BGPSessionListener;
 import org.opendaylight.protocol.bgp.rib.spi.BGPTerminationReason;
+import org.opendaylight.protocol.bgp.rib.spi.ExportPolicyPeerTracker;
+import org.opendaylight.protocol.bgp.rib.spi.IdentifierUtils;
 import org.opendaylight.protocol.bgp.rib.spi.Peer;
-import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev100924.Ipv4Prefix;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.DestinationIpv4Builder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.destination.ipv4.Ipv4Prefixes;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev150305.ipv4.prefixes.destination.ipv4.Ipv4PrefixesBuilder;
-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;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.Attributes;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.AttributesBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.Attributes1;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.Attributes2;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.BgpTableType;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpReachNlri;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpReachNlriBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlri;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.MpUnreachNlriBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.reach.nlri.AdvertizedRoutesBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev130919.update.attributes.mp.unreach.nlri.WithdrawnRoutesBuilder;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerId;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerRole;
-import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
+import org.opendaylight.protocol.bgp.rib.spi.RouterIds;
+import org.opendaylight.protocol.bgp.rib.spi.policy.BGPRouteEntryImportParameters;
+import org.opendaylight.protocol.bgp.rib.spi.state.BGPAfiSafiState;
+import org.opendaylight.protocol.bgp.rib.spi.state.BGPErrorHandlingState;
+import org.opendaylight.protocol.bgp.rib.spi.state.BGPSessionState;
+import org.opendaylight.protocol.bgp.rib.spi.state.BGPTimersState;
+import org.opendaylight.protocol.bgp.rib.spi.state.BGPTransportState;
+import org.opendaylight.protocol.concepts.AbstractRegistration;
+import org.opendaylight.protocol.util.Ipv4Util;
+import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev171207.ipv4.prefixes.DestinationIpv4Builder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev171207.ipv4.prefixes.destination.ipv4.Ipv4Prefixes;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev171207.ipv4.prefixes.destination.ipv4.Ipv4PrefixesBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.inet.rev171207.update.attributes.mp.reach.nlri.advertized.routes.destination.type.DestinationIpv4CaseBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.Update;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.path.attributes.Attributes;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.path.attributes.AttributesBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev171207.update.message.Nlri;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.BgpAddPathTableType;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.BgpTableType;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.RouteRefresh;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.SendReceive;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.mp.capabilities.add.path.capability.AddressFamilies;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.MpReachNlri;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.MpReachNlriBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.MpUnreachNlri;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.MpUnreachNlriBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.mp.reach.nlri.AdvertizedRoutesBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.multiprotocol.rev171207.update.attributes.mp.unreach.nlri.WithdrawnRoutesBuilder;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.peer.rpc.rev171207.BgpPeerRpcService;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.peer.rpc.rev171207.PeerContext;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev171207.PeerId;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev171207.PeerRole;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev171207.bgp.rib.rib.PeerKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev171207.rib.TablesKey;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.Ipv4AddressFamily;
+import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.UnicastSubsequentAddressFamily;
+import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
 import org.opendaylight.yangtools.yang.binding.Notification;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -65,12 +96,25 @@ import org.slf4j.LoggerFactory;
  * Class representing a peer. We have a single instance for each peer, which provides translation from BGP events into
  * RIB actions.
  */
-public class BGPPeer implements BGPSessionListener, Peer, AutoCloseable, BGPPeerRuntimeMXBean, TransactionChainListener {
-
+public class BGPPeer extends BGPPeerStateImpl implements BGPRouteEntryImportParameters,
+        BGPSessionListener, Peer, TransactionChainListener {
     private static final Logger LOG = LoggerFactory.getLogger(BGPPeer.class);
 
     @GuardedBy("this")
     private final Set<TablesKey> tables = new HashSet<>();
+    private final RIB rib;
+    private final String name;
+    private final Map<TablesKey, AdjRibOutListener> adjRibOutListenerSet = new HashMap<>();
+    private final RpcProviderRegistry rpcRegistry;
+    private final PeerRole peerRole;
+    private final KeyedInstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib
+            .rev171207.bgp.rib.rib.Peer, PeerKey> peerIId;
+    @GuardedBy("this")
+    private AbstractRegistration trackerRegistration;
+    @GuardedBy("this")
+    private final Set<AbstractRegistration> tableRegistration = new HashSet<>();
+    private final PeerId peerId;
+    private final YangInstanceIdentifier peerYIId;
     @GuardedBy("this")
     private BGPSession session;
     @GuardedBy("this")
@@ -79,60 +123,28 @@ public class BGPPeer implements BGPSessionListener, Peer, AutoCloseable, BGPPeer
     private DOMTransactionChain chain;
     @GuardedBy("this")
     private AdjRibInWriter ribWriter;
-
-    private final RIB rib;
-    private final String name;
-    private BGPPeerRuntimeRegistrator registrator;
-    private BGPPeerRuntimeRegistration runtimeReg;
-    private long sessionEstablishedCounter = 0L;
-    private final Set<AdjRibOutListener> adjRibOutListenerSet = new HashSet<>();
-
-    public BGPPeer(final String name, final RIB rib) {
-        this(name, rib, PeerRole.Ibgp);
-    }
-
-    public BGPPeer(final String name, final RIB rib, final PeerRole role) {
-        this.rib = Preconditions.checkNotNull(rib);
-        this.name = name;
-        this.chain = rib.createPeerChain(this);
-        this.ribWriter = AdjRibInWriter.create(rib.getYangRibId(), role, this.chain);
-    }
-
-    @Override
-    public synchronized void close() {
-        releaseConnection();
-        this.chain.close();
-    }
-
-    @Override
-    public void onMessage(final BGPSession session, final Notification msg) {
-        if (!(msg instanceof Update)) {
-            LOG.info("Ignoring unhandled message class {}", msg.getClass());
-            return;
-        }
-        final Update message = (Update) msg;
-
-        // update AdjRibs
-        final Attributes attrs = message.getAttributes();
-        MpReachNlri mpReach = null;
-        final boolean isAnyNlriAnnounced = message.getNlri() != null;
-        if (isAnyNlriAnnounced) {
-            mpReach = prefixesToMpReach(message);
-        } else if (attrs != null && attrs.getAugmentation(Attributes1.class) != null) {
-            mpReach = attrs.getAugmentation(Attributes1.class).getMpReachNlri();
-        }
-        if (mpReach != null) {
-            this.ribWriter.updateRoutes(mpReach, nextHopToAttribute(attrs, mpReach));
-        }
-        MpUnreachNlri mpUnreach = null;
-        if (message.getWithdrawnRoutes() != null) {
-            mpUnreach = prefixesToMpUnreach(message, isAnyNlriAnnounced);
-        } else if (attrs != null && attrs.getAugmentation(Attributes2.class) != null) {
-            mpUnreach = attrs.getAugmentation(Attributes2.class).getMpUnreachNlri();
-        }
-        if (mpUnreach != null) {
-            this.ribWriter.removeRoutes(mpUnreach);
-        }
+    @GuardedBy("this")
+    private EffectiveRibInWriter effRibInWriter;
+    private RoutedRpcRegistration<BgpPeerRpcService> rpcRegistration;
+    private Map<TablesKey, SendReceive> addPathTableMaps = Collections.emptyMap();
+
+    public BGPPeer(final IpAddress neighborAddress, final RIB rib, final PeerRole role,
+            final RpcProviderRegistry rpcRegistry,
+            final Set<TablesKey> afiSafisAdvertized,
+            final Set<TablesKey> afiSafisGracefulAdvertized) {
+        //FIXME BUG-6971 Once Peer Group is implemented, pass it
+        super(rib.getInstanceIdentifier(), null, neighborAddress, afiSafisAdvertized,
+                afiSafisGracefulAdvertized);
+        this.peerRole = role;
+        this.rib = requireNonNull(rib);
+        this.name = Ipv4Util.toStringIP(neighborAddress);
+        this.rpcRegistry = rpcRegistry;
+        this.peerId = RouterIds.createPeerId(neighborAddress);
+        this.peerIId = getInstanceIdentifier().child(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns
+                .yang.bgp.rib.rev171207.bgp.rib.rib.Peer.class, new PeerKey(this.peerId));
+        this.peerYIId = this.rib.getYangRibId().node(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang
+                .bgp.rib.rev171207.bgp.rib.rib.Peer.QNAME).node(IdentifierUtils.domPeerId(this.peerId));
+        this.chain = rib.createPeerDOMChain(this);
     }
 
     private static Attributes nextHopToAttribute(final Attributes attrs, final MpReachNlri mpReach) {
@@ -145,21 +157,20 @@ public class BGPPeer implements BGPSessionListener, Peer, AutoCloseable, BGPPeer
     }
 
     /**
-     * Creates MPReach for the prefixes to be handled in the same way as linkstate routes
+     * Creates MPReach for the prefixes to be handled in the same way as linkstate routes.
      *
      * @param message Update message containing prefixes in NLRI
      * @return MpReachNlri with prefixes from the nlri field
      */
     private static MpReachNlri prefixesToMpReach(final Update message) {
-        final List<Ipv4Prefixes> prefixes = new ArrayList<>();
-        for (final Ipv4Prefix p : message.getNlri().getNlri()) {
-            prefixes.add(new Ipv4PrefixesBuilder().setPrefix(p).build());
-        }
+        final List<Ipv4Prefixes> prefixes = message.getNlri().stream()
+                .map(n -> new Ipv4PrefixesBuilder().setPrefix(n.getPrefix()).setPathId(n.getPathId()).build())
+                .collect(Collectors.toList());
         final MpReachNlriBuilder b = new MpReachNlriBuilder().setAfi(Ipv4AddressFamily.class).setSafi(
-            UnicastSubsequentAddressFamily.class).setAdvertizedRoutes(
+                UnicastSubsequentAddressFamily.class).setAdvertizedRoutes(
                 new AdvertizedRoutesBuilder().setDestinationType(
-                    new DestinationIpv4CaseBuilder().setDestinationIpv4(
-                        new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build()).build()).build());
+                        new DestinationIpv4CaseBuilder().setDestinationIpv4(
+                                new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build()).build()).build());
         if (message.getAttributes() != null) {
             b.setCNextHop(message.getAttributes().getCNextHop());
         }
@@ -167,88 +178,224 @@ public class BGPPeer implements BGPSessionListener, Peer, AutoCloseable, BGPPeer
     }
 
     /**
-     * Create MPUnreach for the prefixes to be handled in the same way as linkstate routes
+     * Create MPUnreach for the prefixes to be handled in the same way as linkstate routes.
      *
-     * @param message Update message containing withdrawn routes
-     * @param isAnyNlriAnnounced
+     * @param message            Update message containing withdrawn routes
+     * @param isAnyNlriAnnounced isAnyNlriAnnounced
      * @return MpUnreachNlri with prefixes from the withdrawn routes field
      */
     private static MpUnreachNlri prefixesToMpUnreach(final Update message, final boolean isAnyNlriAnnounced) {
         final List<Ipv4Prefixes> prefixes = new ArrayList<>();
-        for (final Ipv4Prefix p : message.getWithdrawnRoutes().getWithdrawnRoutes()) {
-            boolean nlriAnounced = false;
-            if(isAnyNlriAnnounced) {
-                nlriAnounced = message.getNlri().getNlri().contains(p);
+        message.getWithdrawnRoutes().forEach(w -> {
+
+            Optional<Nlri> nlriAnounced = Optional.empty();
+            if (isAnyNlriAnnounced) {
+                nlriAnounced = message.getNlri().stream().filter(n -> Objects.equal(n.getPrefix(), w.getPrefix())
+                        && Objects.equal(n.getPathId(), w.getPathId()))
+                        .findAny();
+            }
+            if (!nlriAnounced.isPresent()) {
+                prefixes.add(new Ipv4PrefixesBuilder().setPrefix(w.getPrefix()).setPathId(w.getPathId()).build());
             }
+        });
+        return new MpUnreachNlriBuilder().setAfi(Ipv4AddressFamily.class).setSafi(UnicastSubsequentAddressFamily.class)
+                .setWithdrawnRoutes(new WithdrawnRoutesBuilder().setDestinationType(new org.opendaylight.yang.gen.v1
+                        .urn.opendaylight.params.xml.ns.yang.bgp.inet.rev171207.update.attributes.mp.unreach.nlri
+                        .withdrawn.routes.destination.type.DestinationIpv4CaseBuilder().setDestinationIpv4(
+                        new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build()).build()).build()).build();
+    }
 
-            if(!nlriAnounced) {
-                prefixes.add(new Ipv4PrefixesBuilder().setPrefix(p).build());
+    private static Map<TablesKey, SendReceive> mapTableTypesFamilies(final List<AddressFamilies> addPathTablesType) {
+        return ImmutableMap.copyOf(addPathTablesType.stream().collect(Collectors.toMap(af -> new TablesKey(af.getAfi(),
+                        af.getSafi()),
+                BgpAddPathTableType::getSendReceive)));
+    }
+
+    public synchronized void instantiateServiceInstance() {
+        this.ribWriter = AdjRibInWriter.create(this.rib.getYangRibId(), this.peerRole, this.chain);
+        setActive(true);
+    }
+
+    // FIXME ListenableFuture<?> should be used once closeServiceInstance uses wildcard too
+    @Override
+    public synchronized ListenableFuture<Void> close() {
+        final ListenableFuture<Void> future = releaseConnection();
+        this.chain.close();
+        setActive(false);
+        return future;
+    }
+
+    @Override
+    public void onMessage(final BGPSession session, final Notification msg) throws BGPDocumentedException {
+        if (!(msg instanceof Update) && !(msg instanceof RouteRefresh)) {
+            LOG.info("Ignoring unhandled message class {}", msg.getClass());
+            return;
+        }
+        if (msg instanceof Update) {
+            onUpdateMessage((Update) msg);
+        } else {
+            onRouteRefreshMessage((RouteRefresh) msg);
+        }
+    }
+
+    private void onRouteRefreshMessage(final RouteRefresh message) {
+        final Class<? extends AddressFamily> rrAfi = message.getAfi();
+        final Class<? extends SubsequentAddressFamily> rrSafi = message.getSafi();
+
+        final TablesKey key = new TablesKey(rrAfi, rrSafi);
+        final AdjRibOutListener listener = this.adjRibOutListenerSet.get(key);
+        if (listener != null) {
+            listener.close();
+            this.adjRibOutListenerSet.remove(key);
+            createAdjRibOutListener(key, listener.isMpSupported());
+        } else {
+            LOG.info("Ignoring RouteRefresh message. Afi/Safi is not supported: {}, {}.", rrAfi, rrSafi);
+        }
+    }
+
+    /**
+     * Check for presence of well known mandatory attribute LOCAL_PREF in Update message.
+     *
+     * @param message Update message
+     */
+    private void checkMandatoryAttributesPresence(final Update message) throws BGPDocumentedException {
+        if (MessageUtil.isAnyNlriPresent(message)) {
+            final Attributes attrs = message.getAttributes();
+            if (this.peerRole == PeerRole.Ibgp && (attrs == null || attrs.getLocalPref() == null)) {
+                throw new BGPDocumentedException(BGPError.MANDATORY_ATTR_MISSING_MSG + "LOCAL_PREF",
+                        BGPError.WELL_KNOWN_ATTR_MISSING,
+                        new byte[]{LocalPreferenceAttributeParser.TYPE});
             }
         }
-        return new MpUnreachNlriBuilder().setAfi(Ipv4AddressFamily.class).setSafi(UnicastSubsequentAddressFamily.class).setWithdrawnRoutes(
-                new WithdrawnRoutesBuilder().setDestinationType(
-                    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(
-                        new DestinationIpv4Builder().setIpv4Prefixes(prefixes).build()).build()).build()).build();
+    }
+
+    /**
+     * Process Update message received.
+     * Calls {@link #checkMandatoryAttributesPresence(Update)} to check for presence of mandatory attributes.
+     *
+     * @param message Update message
+     */
+    private synchronized void onUpdateMessage(final Update message) throws BGPDocumentedException {
+        checkMandatoryAttributesPresence(message);
+
+        // update AdjRibs
+        final Attributes attrs = message.getAttributes();
+        MpReachNlri mpReach;
+        final boolean isAnyNlriAnnounced = message.getNlri() != null;
+        if (isAnyNlriAnnounced) {
+            mpReach = prefixesToMpReach(message);
+        } else {
+            mpReach = MessageUtil.getMpReachNlri(attrs);
+        }
+        if (mpReach != null) {
+            this.ribWriter.updateRoutes(mpReach, nextHopToAttribute(attrs, mpReach));
+        }
+        MpUnreachNlri mpUnreach;
+        if (message.getWithdrawnRoutes() != null) {
+            mpUnreach = prefixesToMpUnreach(message, isAnyNlriAnnounced);
+        } else {
+            mpUnreach = MessageUtil.getMpUnreachNlri(attrs);
+        }
+        if (mpUnreach != null) {
+            this.ribWriter.removeRoutes(mpUnreach);
+        }
     }
 
     @Override
     public synchronized void onSessionUp(final BGPSession session) {
-        LOG.info("Session with peer {} went up with tables: {}", this.name, session.getAdvertisedTableTypes());
         this.session = session;
+        if (this.session instanceof BGPSessionStateProvider) {
+            ((BGPSessionStateProvider) this.session).registerMessagesCounter(this);
+        }
+        final List<AddressFamilies> addPathTablesType = session.getAdvertisedAddPathTableTypes();
+        final Set<BgpTableType> advertizedTableTypes = session.getAdvertisedTableTypes();
+        final List<BgpTableType> advertizedGracefulRestartTableTypes = session.getAdvertisedGracefulRestartTableTypes();
+        LOG.info("Session with peer {} went up with tables {} and Add Path tables {}", this.name,
+                advertizedTableTypes, addPathTablesType);
         this.rawIdentifier = InetAddresses.forString(session.getBgpId().getValue()).getAddress();
-        final PeerId peerId = RouterIds.createPeerId(session.getBgpId());
+        this.tables.addAll(advertizedTableTypes.stream().map(t -> new TablesKey(t.getAfi(), t.getSafi()))
+                .collect(Collectors.toList()));
 
-        createAdjRibOutListener(peerId);
+        setAdvertizedGracefulRestartTableTypes(advertizedGracefulRestartTableTypes.stream()
+                .map(t -> new TablesKey(t.getAfi(), t.getSafi())).collect(Collectors.toList()));
+        this.addPathTableMaps = mapTableTypesFamilies(addPathTablesType);
 
-        this.ribWriter = this.ribWriter.transform(peerId, this.rib.getRibSupportContext(), this.tables, false);
-        this.sessionEstablishedCounter++;
-        if (this.registrator != null) {
-            this.runtimeReg = this.registrator.register(this);
+        for (final TablesKey key : this.tables) {
+            createAdjRibOutListener(key, true);
         }
-    }
 
-    private void createAdjRibOutListener(final PeerId peerId) {
-        for (final BgpTableType t : session.getAdvertisedTableTypes()) {
-            final TablesKey key = new TablesKey(t.getAfi(), t.getSafi());
-            if (this.tables.add(key)) {
-                createAdjRibOutListener(peerId, key, true);
+        for(final TablesKey tablesKey :this.tables) {
+            final ExportPolicyPeerTracker exportTracker = this.rib.getExportPolicyPeerTracker(tablesKey);
+            if (exportTracker != null) {
+                this.tableRegistration.add(exportTracker.registerPeer(this.peerId, this.addPathTableMaps.get(tablesKey),
+                        this.peerYIId, this.peerRole));
             }
         }
-
-        addBgp4Support(peerId);
+        addBgp4Support();
+
+        this.effRibInWriter = EffectiveRibInWriter.create(this, this.rib, this.rib.createPeerChain(this),
+                this.peerIId, this.tables);
+        registerPrefixesCounters(this.effRibInWriter, this.effRibInWriter);
+        this.ribWriter = this.ribWriter.transform(this.peerId, this.rib.getRibSupportContext(), this.tables,
+                this.addPathTableMaps);
+
+        if (this.rpcRegistry != null) {
+            this.rpcRegistration = this.rpcRegistry.addRoutedRpcImplementation(BgpPeerRpcService.class,
+                    new BgpPeerRpc(this, session, this.tables));
+            final KeyedInstanceIdentifier<org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib
+                    .rev171207.bgp.rib.rib.Peer, PeerKey> path = this.rib.getInstanceIdentifier()
+                    .child(org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev171207.bgp.rib
+                             .rib.Peer.class, new PeerKey(this.peerId));
+            this.rpcRegistration.registerPath(PeerContext.class, path);
+        }
+        this.trackerRegistration = this.rib.getPeerTracker().registerPeer(this);
     }
 
     //try to add a support for old-school BGP-4, if peer did not advertise IPv4-Unicast MP capability
-    private void addBgp4Support(final PeerId peerId) {
+    private void addBgp4Support() {
         final TablesKey key = new TablesKey(Ipv4AddressFamily.class, UnicastSubsequentAddressFamily.class);
         if (this.tables.add(key)) {
-            createAdjRibOutListener(peerId, key, false);
+            createAdjRibOutListener(key, false);
+            final ExportPolicyPeerTracker exportTracker = this.rib.getExportPolicyPeerTracker(key);
+            if (exportTracker != null) {
+                this.tableRegistration.add(exportTracker.registerPeer(peerId,  null, this.peerYIId,
+                        this.peerRole));
+            }
         }
     }
 
-    private void createAdjRibOutListener(final PeerId peerId, final TablesKey key, final boolean mpSupport) {
+    private synchronized void createAdjRibOutListener(final TablesKey key,
+            final boolean mpSupport) {
         final RIBSupportContext context = this.rib.getRibSupportContext().getRIBSupportContext(key);
 
         // not particularly nice
         if (context != null && this.session instanceof BGPSessionImpl) {
-            this.adjRibOutListenerSet.add(AdjRibOutListener.create(peerId, key, this.rib.getYangRibId(), this.rib.getCodecsRegistry(),
-                context.getRibSupport(), ((RIBImpl) this.rib).getService(), ((BGPSessionImpl) this.session).getLimiter(), mpSupport));
+            final ChannelOutputLimiter limiter = ((BGPSessionImpl) this.session).getLimiter();
+            final AdjRibOutListener adjRibOut = AdjRibOutListener.create(this.peerId, key,
+                    this.rib.getYangRibId(), this.rib.getCodecsRegistry(), context.getRibSupport(),
+                    this.rib.getService(), limiter, mpSupport);
+            this.adjRibOutListenerSet.put(key, adjRibOut);
+            registerPrefixesSentCounter(key, adjRibOut);
         }
     }
 
-    private synchronized void cleanup() {
+    private ListenableFuture<Void> cleanup() {
         // FIXME: BUG-196: support graceful
-        for (final AdjRibOutListener adjRibOutListener : this.adjRibOutListenerSet) {
-            adjRibOutListener.close();
-        }
+        this.adjRibOutListenerSet.values().forEach(AdjRibOutListener::close);
         this.adjRibOutListenerSet.clear();
-        this.ribWriter.removePeer();
+        if (this.effRibInWriter != null) {
+            this.effRibInWriter.close();
+        }
         this.tables.clear();
+        if (this.ribWriter != null) {
+            return this.ribWriter.removePeer();
+        }
+        return Futures.immediateFuture(null);
     }
 
     @Override
     public void onSessionDown(final BGPSession session, final Exception e) {
-        if(e.getMessage().equals(BGPSessionImpl.END_OF_INPUT)) {
+        if (e.getMessage().equals(BGPSessionImpl.END_OF_INPUT)) {
             LOG.info("Session with peer {} went down", this.name);
         } else {
             LOG.info("Session with peer {} went down", this.name, e);
@@ -279,17 +426,13 @@ public class BGPPeer implements BGPSessionListener, Peer, AutoCloseable, BGPPeer
     }
 
     @Override
-    public void releaseConnection() {
-        cleanup();
-        dropConnection();
-    }
-
-    @GuardedBy("this")
-    private void dropConnection() {
-        if (this.runtimeReg != null) {
-            this.runtimeReg.close();
-            this.runtimeReg = null;
+    public synchronized ListenableFuture<Void> releaseConnection() {
+        if (this.rpcRegistration != null) {
+            this.rpcRegistration.close();
         }
+        closeRegistration();
+        final ListenableFuture<Void> future = cleanup();
+
         if (this.session != null) {
             try {
                 this.session.close();
@@ -298,11 +441,18 @@ public class BGPPeer implements BGPSessionListener, Peer, AutoCloseable, BGPPeer
             }
             this.session = null;
         }
+
+        resetState();
+        return future;
     }
 
-    @Override
-    public boolean isSessionActive() {
-        return this.session != null;
+    private void closeRegistration() {
+        this.tableRegistration.iterator().forEachRemaining(AbstractRegistration::close);
+        this.tableRegistration.clear();
+        if (this.trackerRegistration != null) {
+            this.trackerRegistration.close();
+            this.trackerRegistration = null;
+        }
     }
 
     @Override
@@ -311,59 +461,91 @@ public class BGPPeer implements BGPSessionListener, Peer, AutoCloseable, BGPPeer
     }
 
     @Override
-    public void resetSession() {
-        releaseConnection();
+    public PeerId getPeerId() {
+        return this.peerId;
     }
 
     @Override
-    public void resetStats() {
-        if (this.session instanceof BGPSessionStatistics) {
-            ((BGPSessionStatistics) this.session).resetSessionStats();
-        }
+    public SendReceive getSupportedAddPathTables(final TablesKey tableKey) {
+        return this.addPathTableMaps.get(tableKey);
     }
 
-    public synchronized void registerRootRuntimeBean(final BGPPeerRuntimeRegistrator registrator) {
-        this.registrator = registrator;
+    @Override
+    public boolean supportsTable(final TablesKey tableKey) {
+        return this.tables.contains(tableKey);
     }
 
     @Override
-    public BgpSessionState getBgpSessionState() {
-        if (this.session instanceof BGPSessionStatistics) {
-            return ((BGPSessionStatistics) this.session).getBgpSesionState();
-        }
-        return new BgpSessionState();
+    public YangInstanceIdentifier getPeerRibInstanceIdentifier() {
+        return this.peerYIId;
     }
 
     @Override
-    public synchronized BgpPeerState getBgpPeerState() {
-        final BgpPeerState peerState = new BgpPeerState();
-        final List<RouteTable> routes = Lists.newArrayList();
-        for (final TablesKey tablesKey : this.tables) {
-            final RouteTable routeTable = new RouteTable();
-            routeTable.setTableType("afi=" + tablesKey.getAfi().getSimpleName() + ",safi=" + tablesKey.getSafi().getSimpleName());
-            routeTable.setRoutesCount(this.rib.getRoutesCount(tablesKey));
-            routes.add(routeTable);
-        }
-        peerState.setRouteTable(routes);
-        peerState.setSessionEstablishedCount(this.sessionEstablishedCounter);
-        return peerState;
+    public PeerRole getRole() {
+        return this.peerRole;
     }
 
     @Override
-    public void onTransactionChainFailed(final TransactionChain<?, ?> chain, final AsyncTransaction<?, ?> transaction, final Throwable cause) {
+    public synchronized void onTransactionChainFailed(final TransactionChain<?, ?> chain,
+            final AsyncTransaction<?, ?> transaction, final Throwable cause) {
         LOG.error("Transaction chain failed.", cause);
-        releaseConnection();
         this.chain.close();
-        this.chain = this.rib.createPeerChain(this);
+        this.chain = this.rib.createPeerDOMChain(this);
+        this.ribWriter = AdjRibInWriter.create(this.rib.getYangRibId(), this.peerRole, this.chain);
+        releaseConnection();
     }
 
     @Override
     public void onTransactionChainSuccessful(final TransactionChain<?, ?> chain) {
-        LOG.debug("Transaction chain {} successfull.", chain);
+        LOG.debug("Transaction chain {} successful.", chain);
     }
 
     @Override
-    public void markUptodate(final TablesKey tablesKey) {
+    public synchronized void markUptodate(final TablesKey tablesKey) {
         this.ribWriter.markTableUptodate(tablesKey);
     }
+
+    @Override
+    public BGPErrorHandlingState getBGPErrorHandlingState() {
+        return this;
+    }
+
+    @Override
+    public BGPAfiSafiState getBGPAfiSafiState() {
+        return this;
+    }
+
+    @Override
+    public synchronized BGPSessionState getBGPSessionState() {
+        if (this.session instanceof BGPSessionStateProvider) {
+            return ((BGPSessionStateProvider) this.session).getBGPSessionState();
+        }
+        return null;
+    }
+
+    @Override
+    public synchronized BGPTimersState getBGPTimersState() {
+        if (this.session instanceof BGPSessionStateProvider) {
+            return ((BGPSessionStateProvider) this.session).getBGPTimersState();
+        }
+        return null;
+    }
+
+    @Override
+    public synchronized BGPTransportState getBGPTransportState() {
+        if (this.session instanceof BGPSessionStateProvider) {
+            return ((BGPSessionStateProvider) this.session).getBGPTransportState();
+        }
+        return null;
+    }
+
+    @Override
+    public PeerRole getFromPeerRole() {
+        return getRole();
+    }
+
+    @Override
+    public PeerId getFromPeerId() {
+        return getPeerId();
+    }
 }