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/*
* Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package io.fd.honeycomb.vbd.impl;
import com.google.common.base.Preconditions;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import javax.annotation.concurrent.GuardedBy;
import org.opendaylight.controller.md.sal.binding.api.BindingTransactionChain;
import org.opendaylight.controller.md.sal.binding.api.DataBroker;
import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
import org.opendaylight.controller.md.sal.binding.api.DataTreeChangeListener;
import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;
import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;
import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.network.topology.topology.topology.types.VbridgeTopology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
import org.opendaylight.yangtools.yang.binding.KeyedInstanceIdentifier;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Class responsible for monitoring /network-topology/topology and activating a {@link BridgeDomain} when a particular
* topology is marked as a bridge domain.
*/
final class TopologyMonitor implements DataTreeChangeListener<VbridgeTopology>, AutoCloseable {
private static final Logger LOG = LoggerFactory.getLogger(TopologyMonitor.class);
@GuardedBy("this")
private final Map<TopologyKey, BridgeDomain> domains = new HashMap<>();
private final DataBroker dataBroker;
TopologyMonitor(final DataBroker dataBroker) {
this.dataBroker = Preconditions.checkNotNull(dataBroker);
}
@Override
public synchronized void onDataTreeChanged(final Collection<DataTreeModification<VbridgeTopology>> changes) {
for (DataTreeModification<VbridgeTopology> c : changes) {
@SuppressWarnings("unchecked")
final KeyedInstanceIdentifier<Topology, TopologyKey> topology =
(KeyedInstanceIdentifier<Topology, TopologyKey>) c.getRootPath().getRootIdentifier()
.firstIdentifierOf(Topology.class);
Preconditions.checkArgument(!topology.isWildcarded(), "Wildcard topology %s is not supported", topology);
final DataObjectModification<VbridgeTopology> mod = c.getRootNode();
switch (mod.getModificationType()) {
case DELETE:
LOG.debug("Topology {} removed", topology);
stopDomain(topology);
break;
case WRITE:
LOG.debug("Topology {} added", topology);
startDomain(topology);
break;
default:
LOG.warn("Ignoring unhandled modification type {}", mod.getModificationType());
break;
}
}
}
private synchronized void completeDomain(final KeyedInstanceIdentifier<Topology, TopologyKey> topology) {
LOG.debug("Bridge domain for {} completed operation", topology);
domains.remove(topology);
synchronized (domains) {
domains.notify();
}
}
private synchronized void restartDomain(final KeyedInstanceIdentifier<Topology, TopologyKey> topology) {
final BridgeDomain prev = domains.remove(topology);
if (prev == null) {
LOG.warn("No domain for {}, not restarting", topology);
return;
}
prev.forceStop();
startDomain(topology);
}
@GuardedBy("this")
private void startDomain(final KeyedInstanceIdentifier<Topology, TopologyKey> topology) {
final BridgeDomain prev = domains.get(topology.getKey());
if (prev != null) {
LOG.warn("Bridge domain {} for {} already started", prev, topology);
return;
}
LOG.debug("Starting bridge domain for {}", topology);
final BindingTransactionChain chain = dataBroker.createTransactionChain(new TransactionChainListener() {
@Override
public void onTransactionChainSuccessful(final TransactionChain<?, ?> chain) {
completeDomain(topology);
}
@Override
public void onTransactionChainFailed(final TransactionChain<?, ?> chain,
final AsyncTransaction<?, ?> transaction, final Throwable cause) {
LOG.warn("Bridge domain for {} failed, restarting it", cause);
restartDomain(topology);
}
});
final BridgeDomain domain = BridgeDomain.create(dataBroker, topology, chain);
domains.put(topology.getKey(), domain);
LOG.debug("Bridge domain {} for {} started", domain, topology);
}
@GuardedBy("this")
private void stopDomain(final KeyedInstanceIdentifier<Topology, TopologyKey> topology) {
final BridgeDomain domain = domains.remove(topology.getKey());
if (domain == null) {
LOG.warn("Bridge domain for {} not present", topology);
return;
}
domain.stop();
}
@Override
public synchronized void close() {
LOG.debug("Topology monitor {} shut down started", this);
for (Entry<TopologyKey, BridgeDomain> e : domains.entrySet()) {
LOG.debug("Shutting down bridge domain {} (key {})", e.getValue(), e.getKey());
e.getValue().stop();
}
while (!domains.isEmpty()) {
LOG.debug("Waiting for domains for {} to complete", domains.keySet());
synchronized (domains) {
try {
domains.wait();
} catch (InterruptedException e) {
LOG.warn("Interrupted while waiting for domain shutdown, {} have not completed yet",
domains.keySet(), e);
break;
}
}
}
LOG.debug("Topology monitor {} shut down completed", this);
}
}
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