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