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