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

   1 /*
   2  * Copyright (c) 2015 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 com.google.common.base.Preconditions;
  11 import java.util.Collection;
  12 import java.util.Collections;
  13 import javax.annotation.Nonnull;
  14 import javax.annotation.concurrent.NotThreadSafe;
  15 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  16 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  17 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeService;
  18 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeIdentifier;
  19 import org.opendaylight.protocol.bgp.rib.impl.spi.RIBSupportContextRegistry;
  20 import org.opendaylight.protocol.bgp.rib.spi.RIBSupport;
  21 import org.opendaylight.protocol.bgp.rib.spi.RibSupportUtils;
  22 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.Update;
  23 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.message.rev130919.path.attributes.Attributes;
  24 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.PeerId;
  25 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.Peer;
  26 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.bgp.rib.rib.peer.AdjRibOut;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.Tables;
  28 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev130925.rib.TablesKey;
  29 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  30 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  31 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
  32 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
  33 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  34 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
  35 import org.slf4j.Logger;
  36 import org.slf4j.LoggerFactory;
  37
  38 /**
  39  * Instantiated for each peer and table, listens on a particular peer's adj-rib-out,
  40  * performs transcoding to BA form (message) and sends it down the channel.
  41  */
  42 @NotThreadSafe
  43 final class AdjRibOutListener implements DOMDataTreeChangeListener {
  44
  45     private static final Logger LOG = LoggerFactory.getLogger(AdjRibOutListener.class);
  46
  47     private final ChannelOutputLimiter session;
  48     private final RIBSupportContextImpl context;
  49     private final RIBSupport support;
  50
  51     private AdjRibOutListener(final PeerId peerId, final TablesKey tablesKey, final YangInstanceIdentifier ribId, final DOMDataTreeChangeService service, final RIBSupportContextRegistry registry, final ChannelOutputLimiter session) {
  52         this.session = Preconditions.checkNotNull(session);
  53         this.context = (RIBSupportContextImpl) registry.getRIBSupportContext(tablesKey);
  54         this.support = this.context.getRibSupport();
  55         final YangInstanceIdentifier adjRibOutId =  ribId.node(Peer.QNAME).node(IdentifierUtils.domPeerId(peerId)).node(AdjRibOut.QNAME).node(Tables.QNAME).node(RibSupportUtils.toYangTablesKey(tablesKey));
  56         service.registerDataTreeChangeListener(new DOMDataTreeIdentifier(LogicalDatastoreType.OPERATIONAL, adjRibOutId), this);
  57     }
  58
  59     static AdjRibOutListener create(@Nonnull final PeerId peerId, @Nonnull final TablesKey tablesKey, @Nonnull final YangInstanceIdentifier ribId, @Nonnull final DOMDataTreeChangeService service, @Nonnull final RIBSupportContextRegistry registry, @Nonnull final ChannelOutputLimiter session) {
  60         return new AdjRibOutListener(peerId, tablesKey, ribId, service, registry, session);
  61     }
  62
  63     @Override
  64     public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
  65         LOG.debug("Data change received for AdjRibOut {}", changes);
  66         for (final DataTreeCandidate tc : changes) {
  67             LOG.trace("Change {} type {}", tc.getRootNode(), tc.getRootNode().getModificationType());
  68             for (final DataTreeCandidateNode child : tc.getRootNode().getChildNodes()) {
  69                 for (final DataTreeCandidateNode route : this.context.getRibSupport().changedRoutes(child)) {
  70                     final Update update;
  71
  72                     switch (route.getModificationType()) {
  73                     case UNMODIFIED:
  74                         LOG.debug("Skipping unmodified route {}", route.getIdentifier());
  75                         continue;
  76                     case DELETE:
  77                         // FIXME: we can batch deletions into a single batch
  78                         update = withdraw((MapEntryNode) route.getDataBefore().get());
  79                         break;
  80                     case SUBTREE_MODIFIED:
  81                     case WRITE:
  82                         update = advertise((MapEntryNode) route.getDataAfter().get());
  83                         break;
  84                     default:
  85                         LOG.warn("Ignoring unhandled modification type {}", route.getModificationType());
  86                         continue;
  87                     }
  88
  89                     LOG.debug("Writing update {}", update);
  90                     this.session.write(update);
  91                 }
  92             }
  93         }
  94         this.session.flush();
  95     }
  96
  97     private Attributes routeAttributes(final MapEntryNode route) {
  98         if (LOG.isDebugEnabled()) {
  99             LOG.debug("AdjRibOut parsing route {}", NormalizedNodes.toStringTree(route));
 100         }
 101
 102         final ContainerNode advertisedAttrs = (ContainerNode) NormalizedNodes.findNode(route, this.support.routeAttributesIdentifier()).orNull();
 103         return this.context.deserializeAttributes(advertisedAttrs);
 104     }
 105
 106     private Update withdraw(final MapEntryNode route) {
 107         return this.support.buildUpdate(Collections.<MapEntryNode>emptyList(), Collections.singleton(route), routeAttributes(route));
 108     }
 109
 110     private Update advertise(final MapEntryNode route) {
 111         return this.support.buildUpdate(Collections.singleton(route), Collections.<MapEntryNode>emptyList(), routeAttributes(route));
 112     }
 113 }