vbd/impl/src/main/java/io/fd/honeycomb/vbd/impl/TopologyMonitor.java

   1 /*
   2  * Copyright (c) 2016 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
   9 package io.fd.honeycomb.vbd.impl;
  10
  11 import com.google.common.base.Preconditions;
  12 import io.fd.honeycomb.vbd.api.VxlanTunnelIdAllocator;
  13 import java.util.Collection;
  14 import java.util.HashMap;
  15 import java.util.Map;
  16 import java.util.Map.Entry;
  17 import javax.annotation.concurrent.GuardedBy;
  18 import org.opendaylight.controller.md.sal.binding.api.BindingTransactionChain;
  19 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  20 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  21 import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
  22 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  23 import org.opendaylight.controller.md.sal.binding.api.MountPointService;
  24 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;
  25 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;
  26 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
  27 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.network.topology.topology.topology.types.VbridgeTopology;
  28 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  29 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  30 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  31 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
  32 import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
  33 import org.slf4j.Logger;
  34 import org.slf4j.LoggerFactory;
  35
  36 /**
  37  * Class responsible for monitoring /network-topology/topology and activating a {@link BridgeDomain} when a particular
  38  * topology is marked as a bridge domain.
  39  */
  40 final class TopologyMonitor implements DataTreeChangeListener<VbridgeTopology>, AutoCloseable {
  41     private static final Logger LOG = LoggerFactory.getLogger(TopologyMonitor.class);
  42
  43     @GuardedBy("this")
  44     private final Map<TopologyKey, BridgeDomain> domains = new HashMap<>();
  45     private final DataBroker dataBroker;
  46     private final MountPointService mountService;
  47     private static final VxlanTunnelIdAllocator tunnelIdAllocator = new VxlanTunnelIdAllocatorImpl();
  48
  49     public TopologyMonitor(DataBroker dataBroker, MountPointService mountService) {
  50         this.dataBroker = Preconditions.checkNotNull(dataBroker);
  51         this.mountService = Preconditions.checkNotNull(mountService);
  52
  53     }
  54
  55     @Override
  56     public synchronized void onDataTreeChanged(final Collection<DataTreeModification<VbridgeTopology>> changes) {
  57         for (DataTreeModification<VbridgeTopology> c : changes) {
  58             @SuppressWarnings("unchecked")
  59             final KeyedInstanceIdentifier<Topology, TopologyKey> topology =
  60                     (KeyedInstanceIdentifier<Topology, TopologyKey>) c.getRootPath().getRootIdentifier()
  61                     .firstIdentifierOf(Topology.class);
  62
  63             Preconditions.checkArgument(!topology.isWildcarded(), "Wildcard topology %s is not supported", topology);
  64
  65             final DataObjectModification<VbridgeTopology> mod = c.getRootNode();
  66             switch (mod.getModificationType()) {
  67                 case DELETE:
  68                     LOG.debug("Topology {} removed", topology);
  69                     stopDomain(topology);
  70                     break;
  71                 case WRITE:
  72                     LOG.debug("Topology {} added", topology);
  73                     startDomain(topology);
  74                     break;
  75                 default:
  76                     LOG.warn("Ignoring unhandled modification type {}", mod.getModificationType());
  77                     break;
  78             }
  79         }
  80     }
  81
  82     private synchronized void completeDomain(final KeyedInstanceIdentifier<Topology, TopologyKey> topology) {
  83         LOG.debug("Bridge domain for {} completed operation", topology);
  84         domains.remove(topology);
  85
  86         synchronized (domains) {
  87             domains.notify();
  88         }
  89     }
  90
  91     private synchronized void restartDomain(final KeyedInstanceIdentifier<Topology, TopologyKey> topology) {
  92         final BridgeDomain prev = domains.remove(topology);
  93         if (prev == null) {
  94             LOG.warn("No domain for {}, not restarting", topology);
  95             return;
  96         }
  97
  98         prev.forceStop();
  99         startDomain(topology);
 100     }
 101
 102     @GuardedBy("this")
 103     private void startDomain(final KeyedInstanceIdentifier<Topology, TopologyKey> topology) {
 104         final BridgeDomain prev = domains.get(topology.getKey());
 105         if (prev != null) {
 106             LOG.warn("Bridge domain {} for {} already started", prev, topology);
 107             return;
 108         }
 109
 110         LOG.debug("Starting bridge domain for {}", topology);
 111
 112         final BindingTransactionChain chain = dataBroker.createTransactionChain(new TransactionChainListener() {
 113             @Override
 114             public void onTransactionChainSuccessful(final TransactionChain<?, ?> chain) {
 115                 completeDomain(topology);
 116             }
 117
 118             @Override
 119             public void onTransactionChainFailed(final TransactionChain<?, ?> chain,
 120                     final AsyncTransaction<?, ?> transaction, final Throwable cause) {
 121                 LOG.warn("Bridge domain for {} failed, restarting it", cause);
 122                 restartDomain(topology);
 123             }
 124         });
 125
 126         final BridgeDomain domain = BridgeDomain.create(dataBroker, mountService, topology, chain, tunnelIdAllocator);
 127         domains.put(topology.getKey(), domain);
 128
 129         LOG.debug("Bridge domain {} for {} started", domain, topology);
 130     }
 131
 132     @GuardedBy("this")
 133     private void stopDomain(final KeyedInstanceIdentifier<Topology, TopologyKey> topology) {
 134         final BridgeDomain domain = domains.remove(topology.getKey());
 135         if (domain == null) {
 136             LOG.warn("Bridge domain for {} not present", topology);
 137             return;
 138         }
 139
 140         domain.stop();
 141     }
 142
 143     @Override
 144     public synchronized void close() {
 145         LOG.debug("Topology monitor {} shut down started", this);
 146
 147         for (Entry<TopologyKey, BridgeDomain> e : domains.entrySet()) {
 148             LOG.debug("Shutting down bridge domain {} (key {})", e.getValue(), e.getKey());
 149             e.getValue().stop();
 150         }
 151
 152         while (!domains.isEmpty()) {
 153             LOG.debug("Waiting for domains for {} to complete", domains.keySet());
 154             synchronized (domains) {
 155                 try {
 156                     domains.wait();
 157                 } catch (InterruptedException e) {
 158                     LOG.warn("Interrupted while waiting for domain shutdown, {} have not completed yet",
 159                         domains.keySet(), e);
 160                     break;
 161                 }
 162             }
 163         }
 164
 165         LOG.debug("Topology monitor {} shut down completed", this);
 166     }
 167
 168     public static class VxlanTunnelIdAllocatorImpl implements VxlanTunnelIdAllocator {
 169
 170         private final Map<KeyedInstanceIdentifier<Node, NodeKey>, Integer> vppIIToNextTunnelId;
 171
 172         VxlanTunnelIdAllocatorImpl() {
 173             vppIIToNextTunnelId = new HashMap<>();
 174         }
 175
 176         @Override
 177         public synchronized Integer nextIdFor(final KeyedInstanceIdentifier<Node, NodeKey> iiToVPP) {
 178             if(vppIIToNextTunnelId.containsKey(iiToVPP)) {
 179                 final int value = vppIIToNextTunnelId.get(iiToVPP);
 180                 vppIIToNextTunnelId.put(iiToVPP, value + 1);
 181                 return value + 1;
 182             } else {
 183                 vppIIToNextTunnelId.put(iiToVPP, 0);
 184                 return 0;
 185             }
 186         }
 187
 188     }
 189 }