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