2 * Copyright (c) 2021 PANTHEON.tech, s.r.o. and others. All rights reserved.
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
8 package org.opendaylight.bgpcep.pcep.topology.provider;
10 import static com.google.common.base.Verify.verifyNotNull;
11 import static java.util.Objects.requireNonNull;
12 import static org.opendaylight.bgpcep.pcep.topology.provider.TopologyUtils.friendlyId;
14 import com.google.common.collect.ImmutableList;
15 import io.netty.util.HashedWheelTimer;
16 import io.netty.util.Timeout;
17 import io.netty.util.Timer;
18 import io.netty.util.TimerTask;
19 import java.util.Collection;
20 import java.util.List;
22 import java.util.concurrent.ConcurrentHashMap;
23 import java.util.concurrent.ConcurrentMap;
24 import java.util.concurrent.TimeUnit;
25 import org.checkerframework.checker.lock.qual.GuardedBy;
26 import org.eclipse.jdt.annotation.NonNull;
27 import org.opendaylight.bgpcep.pcep.server.PceServerProvider;
28 import org.opendaylight.bgpcep.programming.spi.InstructionSchedulerFactory;
29 import org.opendaylight.mdsal.binding.api.ClusteredDataTreeChangeListener;
30 import org.opendaylight.mdsal.binding.api.DataBroker;
31 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
32 import org.opendaylight.mdsal.binding.api.DataTreeModification;
33 import org.opendaylight.mdsal.binding.api.RpcProviderService;
34 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
35 import org.opendaylight.mdsal.singleton.common.api.ClusterSingletonServiceProvider;
36 import org.opendaylight.protocol.pcep.MessageRegistry;
37 import org.opendaylight.protocol.pcep.PCEPCapability;
38 import org.opendaylight.protocol.pcep.PCEPDispatcher;
39 import org.opendaylight.protocol.pcep.spi.PCEPExtensionConsumerContext;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.pcep.topology.stats.rpc.rev190321.PcepTopologyStatsRpcService;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev220730.TopologyTypes1;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.topology.pcep.rev220730.topology.pcep.type.TopologyPcep;
43 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NetworkTopology;
44 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
45 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
46 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.TopologyTypes;
47 import org.opendaylight.yangtools.concepts.Registration;
48 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
49 import org.slf4j.Logger;
50 import org.slf4j.LoggerFactory;
53 * Primary entrypoint into this component. Once an instance of this class is instantiated, it will subscribe to
54 * changes to the configuration datastore. There it filters only topologies which have {@link TopologyPcep} type and for
55 * each one of those instantiates a cluster-wide singleton to handle lifecycle of services attached to that topology.
57 public final class PCEPTopologyTracker
58 implements PCEPTopologyProviderDependencies, ClusteredDataTreeChangeListener<TopologyPcep>, AutoCloseable {
59 private static final Logger LOG = LoggerFactory.getLogger(PCEPTopologyTracker.class);
61 // Services we are using
62 final @NonNull InstructionSchedulerFactory instructionSchedulerFactory;
63 final @NonNull ClusterSingletonServiceProvider singletonService;
64 private final @NonNull RpcProviderService rpcProviderRegistry;
65 private final @NonNull PceServerProvider pceServerProvider;
66 private final @NonNull MessageRegistry messageRegistry;
67 private final @NonNull PCEPDispatcher pcepDispatcher;
68 private final @NonNull DataBroker dataBroker;
70 // Timer used for RPC timeouts and session statistics scheduling
71 private final @NonNull HashedWheelTimer privateTimer = new HashedWheelTimer();
72 private final @NonNull Timer timer = new Timer() {
74 public Timeout newTimeout(final TimerTask task, final long delay, final TimeUnit unit) {
75 return privateTimer.newTimeout(task, delay, unit);
79 public Set<Timeout> stop() {
80 // Do not allow the timer to be shut down
81 throw new UnsupportedOperationException();
85 // Statistics provider
86 private final @NonNull TopologyStatsProvider statsProvider;
88 private final @NonNull TopologyStatsRpcServiceImpl statsRpcs;
90 // FIXME: route to org.opendaylight.protocol.pcep.impl.BasePCEPSessionProposalFactory
91 private final @NonNull ImmutableList<PCEPCapability> capabilities;
93 // We are reusing our monitor as the universal lock. We have to account for three distinct threads competing for
95 // 1) the typical DTCL callback thread invoking onDataTreeChanged()
96 // 2) instance cleanup thread invoking finishDestroy()
97 // 3) framework shutdown thread invoking close()
99 // We need to track not only instances which are deemed alive by the class, but also all instances for which cleanup
100 // has not finished yet, so close() can properly wait for cleanup to finish.
102 // Since close() will terminate the DTCL subscription, the synchronization between 1) and 3) is rather trivial.
104 // The interaction between DTCL and cleanup is tricky. DTCL can report rapid create/destroy/create events and
105 // cleanup is asynchronous and when the dust settles we need to end up in the corrected overall state (created or
108 // In order to achieve that without risking deadlocks, instances are tracked using a concurrent map and each
109 // 'create' edge allocates a new PCEPTopologyInstance object.
110 private final ConcurrentMap<TopologyKey, PCEPTopologySingleton> instances = new ConcurrentHashMap<>();
112 private Registration reg;
114 private Registration statsReg;
116 public PCEPTopologyTracker(final DataBroker dataBroker, final ClusterSingletonServiceProvider singletonService,
117 final RpcProviderService rpcProviderRegistry, final PCEPExtensionConsumerContext extensions,
118 final List<PCEPCapability> capabilities, final PCEPDispatcher pcepDispatcher,
119 final InstructionSchedulerFactory instructionSchedulerFactory, final PceServerProvider pceServerProvider) {
120 this.dataBroker = requireNonNull(dataBroker);
121 this.singletonService = requireNonNull(singletonService);
122 this.rpcProviderRegistry = requireNonNull(rpcProviderRegistry);
123 messageRegistry = extensions.getMessageHandlerRegistry();
124 this.pcepDispatcher = requireNonNull(pcepDispatcher);
125 this.instructionSchedulerFactory = requireNonNull(instructionSchedulerFactory);
126 this.pceServerProvider = requireNonNull(pceServerProvider);
127 this.capabilities = ImmutableList.copyOf(capabilities);
128 statsProvider = new TopologyStatsProvider(timer);
129 statsRpcs = new TopologyStatsRpcServiceImpl(dataBroker);
130 statsReg = rpcProviderRegistry.registerRpcImplementation(PcepTopologyStatsRpcService.class, statsRpcs);
132 reg = dataBroker.registerDataTreeChangeListener(DataTreeIdentifier.create(LogicalDatastoreType.CONFIGURATION,
133 InstanceIdentifier.builder(NetworkTopology.class).child(Topology.class).child(TopologyTypes.class)
134 .augmentation(TopologyTypes1.class).child(TopologyPcep.class).build()), this);
135 LOG.info("PCEP Topology tracker initialized");
139 public MessageRegistry getMessageRegistry() {
140 return messageRegistry;
144 public List<PCEPCapability> getCapabilities() {
149 public PCEPDispatcher getPCEPDispatcher() {
150 return pcepDispatcher;
154 public RpcProviderService getRpcProviderRegistry() {
155 return rpcProviderRegistry;
159 public DataBroker getDataBroker() {
164 public SessionStateRegistry getStateRegistry() {
165 return statsProvider;
169 public PceServerProvider getPceServerProvider() {
170 return pceServerProvider;
174 public Timer getTimer() {
179 public synchronized void close() {
181 // Already closed, bail out
185 LOG.info("PCEP Topology tracker shutting down");
193 // First pass: destroy all tracked instances
194 instances.values().forEach(PCEPTopologySingleton::destroy);
195 // Second pass: wait for cleanup
196 instances.values().forEach(PCEPTopologySingleton::awaitCleanup);
199 final var cancelledTasks = privateTimer.stop().size();
200 if (cancelledTasks != 0) {
201 LOG.warn("Stopped timer with {} remaining tasks", cancelledTasks);
204 statsProvider.shutdown();
205 LOG.info("PCEP Topology tracker shut down");
209 public synchronized void onDataTreeChanged(final Collection<DataTreeModification<TopologyPcep>> changes) {
211 // Registration has been terminated, do not process any changes
215 for (var change : changes) {
216 final var root = change.getRootNode();
217 switch (root.getModificationType()) {
219 // We only care if the topology has been newly introduced, not when its details have changed
220 if (root.getDataBefore() == null) {
221 createInstance(extractTopologyKey(change));
225 destroyInstance(extractTopologyKey(change));
233 private void createInstance(final @NonNull TopologyKey topology) {
234 final var existing = instances.remove(topology);
235 final PCEPTopologySingleton instance;
236 if (existing == null) {
237 LOG.info("Creating topology instance for {}", friendlyId(topology));
238 instance = new PCEPTopologySingleton(this, topology);
240 LOG.info("Resurrecting topology instance for {}", friendlyId(topology));
241 instance = existing.resurrect();
243 instances.put(topology, instance);
246 private void destroyInstance(final @NonNull TopologyKey topology) {
247 final var existing = instances.get(topology);
248 if (existing != null) {
249 LOG.info("Destroying topology instance for {}", friendlyId(topology));
252 LOG.warn("Attempted to destroy non-existent topology instance for {}", friendlyId(topology));
256 void finishDestroy(final TopologyKey topology, final PCEPTopologySingleton instance) {
257 if (instances.remove(topology, instance)) {
258 LOG.info("Destroyed topology instance of {}", friendlyId(topology));
262 private static @NonNull TopologyKey extractTopologyKey(final DataTreeModification<?> change) {
263 final var path = change.getRootPath().getRootIdentifier();
264 return verifyNotNull(path.firstKeyOf(Topology.class), "No topology key in %s", path);