2 * Copyright (c) 2013 Cisco Systems, Inc. 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.bgp.topology.provider;
10 import static java.util.Objects.requireNonNull;
12 import com.google.common.annotations.VisibleForTesting;
13 import com.google.common.base.Preconditions;
14 import com.google.common.util.concurrent.FutureCallback;
15 import com.google.common.util.concurrent.Futures;
16 import com.google.common.util.concurrent.ListenableFuture;
17 import com.google.common.util.concurrent.MoreExecutors;
18 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
19 import java.util.Collection;
20 import java.util.Collections;
21 import java.util.concurrent.atomic.AtomicBoolean;
22 import javax.annotation.concurrent.GuardedBy;
23 import org.opendaylight.bgpcep.topology.TopologyReference;
24 import org.opendaylight.controller.md.sal.binding.api.BindingTransactionChain;
25 import org.opendaylight.controller.md.sal.binding.api.ClusteredDataTreeChangeListener;
26 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
27 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
28 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
29 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
30 import org.opendaylight.controller.md.sal.binding.api.ReadWriteTransaction;
31 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
32 import org.opendaylight.controller.md.sal.common.api.data.AsyncTransaction;
33 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
34 import org.opendaylight.controller.md.sal.common.api.data.TransactionChain;
35 import org.opendaylight.controller.md.sal.common.api.data.TransactionChainListener;
36 import org.opendaylight.protocol.bgp.rib.RibReference;
37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.Route;
38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.bgp.rib.rib.LocRib;
39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.rib.Tables;
40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.rib.rev180329.rib.TablesKey;
41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.AddressFamily;
42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.bgp.types.rev130919.SubsequentAddressFamily;
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.TopologyId;
45 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
46 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyBuilder;
47 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
48 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.TopologyTypes;
49 import org.opendaylight.yangtools.concepts.ListenerRegistration;
50 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
51 import org.slf4j.Logger;
52 import org.slf4j.LoggerFactory;
54 public abstract class AbstractTopologyBuilder<T extends Route> implements ClusteredDataTreeChangeListener<T>,
55 TopologyReference, TransactionChainListener {
56 private static final Logger LOG = LoggerFactory.getLogger(AbstractTopologyBuilder.class);
57 // we limit the listener reset interval to be 5 min at most
58 private static final long LISTENER_RESET_LIMIT_IN_MILLSEC = 5 * 60 * 1000;
59 private static final int LISTENER_RESET_ENFORCE_COUNTER = 3;
60 private final InstanceIdentifier<Topology> topology;
61 private final RibReference locRibReference;
62 private final DataBroker dataProvider;
63 private final Class<? extends AddressFamily> afi;
64 private final Class<? extends SubsequentAddressFamily> safi;
65 private final TopologyKey topologyKey;
66 private final TopologyTypes topologyTypes;
67 private final long listenerResetLimitInMillsec;
68 private final int listenerResetEnforceCounter;
71 private ListenerRegistration<AbstractTopologyBuilder<T>> listenerRegistration = null;
73 private BindingTransactionChain chain = null;
75 private boolean closed = false;
78 protected long listenerScheduledRestartTime = 0;
81 protected int listenerScheduledRestartEnforceCounter = 0;
83 protected AbstractTopologyBuilder(final DataBroker dataProvider, final RibReference locRibReference,
84 final TopologyId topologyId, final TopologyTypes types, final Class<? extends AddressFamily> afi,
85 final Class<? extends SubsequentAddressFamily> safi, final long listenerResetLimitInMillsec,
86 final int listenerResetEnforceCounter) {
87 this.dataProvider = dataProvider;
88 this.locRibReference = requireNonNull(locRibReference);
89 this.topologyKey = new TopologyKey(requireNonNull(topologyId));
90 this.topologyTypes = types;
93 this.listenerResetLimitInMillsec = listenerResetLimitInMillsec;
94 this.listenerResetEnforceCounter = listenerResetEnforceCounter;
95 this.topology = InstanceIdentifier.builder(NetworkTopology.class)
96 .child(Topology.class, this.topologyKey).build();
99 protected AbstractTopologyBuilder(final DataBroker dataProvider, final RibReference locRibReference,
100 final TopologyId topologyId, final TopologyTypes types, final Class<? extends AddressFamily> afi,
101 final Class<? extends SubsequentAddressFamily> safi) {
102 this(dataProvider, locRibReference, topologyId, types, afi, safi, LISTENER_RESET_LIMIT_IN_MILLSEC,
103 LISTENER_RESET_ENFORCE_COUNTER);
106 public final synchronized void start() {
107 LOG.debug("Initiating topology builder from {} at {}. AFI={}, SAFI={}", this.locRibReference, this.topology,
108 this.afi, this.safi);
109 initTransactionChain();
110 initOperationalTopology();
111 registerDataChangeListener();
115 * Register to data tree change listener.
117 private synchronized void registerDataChangeListener() {
118 Preconditions.checkState(this.listenerRegistration == null,
119 "Topology Listener on topology %s has been registered before.",
120 this.getInstanceIdentifier());
121 final InstanceIdentifier<Tables> tablesId = this.locRibReference.getInstanceIdentifier()
122 .child(LocRib.class).child(Tables.class, new TablesKey(this.afi, this.safi));
123 final DataTreeIdentifier<T> id = new DataTreeIdentifier<>(LogicalDatastoreType.OPERATIONAL,
124 getRouteWildcard(tablesId));
126 this.listenerRegistration = this.dataProvider.registerDataTreeChangeListener(id, this);
127 LOG.debug("Registered listener {} on topology {}. Timestamp={}", this, this.getInstanceIdentifier(),
128 this.listenerScheduledRestartTime);
132 * Unregister to data tree change listener.
134 private synchronized void unregisterDataChangeListener() {
135 if (this.listenerRegistration != null) {
136 LOG.debug("Unregistered listener {} on topology {}", this, this.getInstanceIdentifier());
137 this.listenerRegistration.close();
138 this.listenerRegistration = null;
142 protected abstract InstanceIdentifier<T> getRouteWildcard(InstanceIdentifier<Tables> tablesId);
144 protected abstract void createObject(ReadWriteTransaction trans, InstanceIdentifier<T> id, T value);
146 protected abstract void removeObject(ReadWriteTransaction trans, InstanceIdentifier<T> id, T value);
148 protected abstract void clearTopology();
151 public final InstanceIdentifier<Topology> getInstanceIdentifier() {
152 return this.topology;
155 @SuppressFBWarnings(value = "NP_NONNULL_PARAM_VIOLATION", justification = "Unrecognised NullableDecl")
156 public final synchronized ListenableFuture<Void> close() {
158 LOG.trace("Transaction chain was already closed.");
159 Futures.immediateFuture(null);
162 LOG.info("Shutting down builder for {}", getInstanceIdentifier());
163 unregisterDataChangeListener();
164 final ListenableFuture<Void> future = destroyOperationalTopology();
165 destroyTransactionChain();
170 @SuppressWarnings("checkstyle:IllegalCatch")
171 public synchronized void onDataTreeChanged(final Collection<DataTreeModification<T>> changes) {
173 LOG.trace("Transaction chain was already closed, skipping update.");
176 // check if the transaction chain needed to be restarted due to a previous error
177 if (restartTransactionChainOnDemand()) {
178 LOG.debug("The data change {} is disregarded due to restart of listener {}", changes, this);
181 final ReadWriteTransaction trans = this.chain.newReadWriteTransaction();
182 LOG.trace("Received data change {} event with transaction {}", changes, trans.getIdentifier());
183 final AtomicBoolean transactionInError = new AtomicBoolean(false);
184 for (final DataTreeModification<T> change : changes) {
186 routeChanged(change, trans);
187 } catch (final RuntimeException exc) {
188 LOG.warn("Data change {} (transaction {}) was not completely propagated to listener {}", change,
189 trans.getIdentifier(), this, exc);
190 // trans.cancel() is not supported by PingPongTransactionChain, so we just skip the problematic change
191 // trans.submit() must be called first to unlock the current transaction chain, to make the chain
192 // closable so we cannot exit the #onDataTreeChanged() yet
193 transactionInError.set(true);
197 Futures.addCallback(trans.submit(), new FutureCallback<Void>() {
199 public void onSuccess(final Void result) {
200 // as we are enforcing trans.submit(), in some cases the transaction execution actually could be
201 // successfully even when an exception is captured, thus #onTransactionChainFailed() never get invoked.
202 // Though the transaction chain remains usable,
203 // the data loss will not be able to be recovered. Thus we schedule a listener restart here
204 if (transactionInError.get()) {
205 LOG.warn("Transaction {} committed successfully while exception captured. Rescheduling a restart"
206 + " of listener {}", trans
207 .getIdentifier(), AbstractTopologyBuilder.this);
208 scheduleListenerRestart();
210 LOG.trace("Transaction {} committed successfully", trans.getIdentifier());
215 public void onFailure(final Throwable throwable) {
216 // we do nothing but print out the log. Transaction chain restart will be done in
217 // #onTransactionChainFailed()
218 LOG.error("Failed to propagate change (transaction {}) by listener {}", trans.getIdentifier(),
219 AbstractTopologyBuilder.this, throwable);
221 }, MoreExecutors.directExecutor());
225 protected void routeChanged(final DataTreeModification<T> change, final ReadWriteTransaction trans) {
226 final DataObjectModification<T> root = change.getRootNode();
227 switch (root.getModificationType()) {
229 removeObject(trans, change.getRootPath().getRootIdentifier(), root.getDataBefore());
231 case SUBTREE_MODIFIED:
233 if (root.getDataBefore() != null) {
234 removeObject(trans, change.getRootPath().getRootIdentifier(), root.getDataBefore());
236 createObject(trans, change.getRootPath().getRootIdentifier(), root.getDataAfter());
239 throw new IllegalArgumentException("Unhandled modification type " + root.getModificationType());
243 private synchronized void initOperationalTopology() {
244 requireNonNull(this.chain, "A valid transaction chain must be provided.");
245 final WriteTransaction trans = this.chain.newWriteOnlyTransaction();
246 trans.put(LogicalDatastoreType.OPERATIONAL, this.topology,
247 new TopologyBuilder().setKey(this.topologyKey).setServerProvided(Boolean.TRUE)
248 .setTopologyTypes(this.topologyTypes)
249 .setLink(Collections.emptyList()).setNode(Collections.emptyList()).build(), true);
250 Futures.addCallback(trans.submit(), new FutureCallback<Void>() {
252 public void onSuccess(final Void result) {
253 LOG.trace("Transaction {} committed successfully", trans.getIdentifier());
257 public void onFailure(final Throwable throwable) {
258 LOG.error("Failed to initialize topology {} (transaction {}) by listener {}",
259 AbstractTopologyBuilder.this.topology,
260 trans.getIdentifier(), AbstractTopologyBuilder.this, throwable);
262 }, MoreExecutors.directExecutor());
266 * Destroy the current operational topology data. Note a valid transaction must be provided.
268 private synchronized ListenableFuture<Void> destroyOperationalTopology() {
269 requireNonNull(this.chain, "A valid transaction chain must be provided.");
270 final WriteTransaction trans = this.chain.newWriteOnlyTransaction();
271 trans.delete(LogicalDatastoreType.OPERATIONAL, getInstanceIdentifier());
272 final ListenableFuture<Void> future = trans.submit();
273 Futures.addCallback(future, new FutureCallback<Void>() {
275 public void onSuccess(final Void result) {
276 LOG.trace("Operational topology removed {}", AbstractTopologyBuilder.this.topology);
280 public void onFailure(final Throwable throwable) {
281 LOG.error("Unable to reset operational topology {} (transaction {})",
282 AbstractTopologyBuilder.this.topology, trans.getIdentifier(), throwable);
284 }, MoreExecutors.directExecutor());
290 * Reset a transaction chain by closing the current chain and starting a new one.
292 private synchronized void initTransactionChain() {
293 LOG.debug("Initializing transaction chain for topology {}", this);
294 Preconditions.checkState(this.chain == null,
295 "Transaction chain has to be closed before being initialized");
296 this.chain = this.dataProvider.createTransactionChain(this);
300 * Destroy the current transaction chain.
302 private synchronized void destroyTransactionChain() {
303 if (this.chain != null) {
304 LOG.debug("Destroy transaction chain for topology {}", this);
305 // we cannot close the transaction chain, as it will close the AbstractDOMForwardedTransactionFactory
306 // and the transaction factory cannot be reopen even if we recreate the transaction chain
307 // so we abandon the chain directly
308 // FIXME we want to close the transaction chain gracefully once the PingPongTransactionChain get improved
309 // and the above problem get resolved.
311 // this.chain.close();
312 // } catch (Exception e) {
313 // // the close() may not succeed when the transaction chain is locked
314 // LOG.error("Unable to close transaction chain {} for topology builder {}", this.chain,
315 // getInstanceIdentifier());
322 * Reset the data change listener to its initial status.
323 * By resetting the listener we will be able to recover all the data lost before
326 protected synchronized void resetListener() {
327 requireNonNull(this.listenerRegistration, "Listener on topology " + this + " hasn't been initialized.");
328 LOG.debug("Resetting data change listener for topology builder {}", getInstanceIdentifier());
329 // unregister current listener to prevent incoming data tree change first
330 unregisterDataChangeListener();
331 // create new transaction chain to reset the chain status
332 resetTransactionChain();
333 // reset the operational topology data so that we can have clean status
334 destroyOperationalTopology();
335 initOperationalTopology();
336 // re-register the data change listener to reset the operational topology
337 // we are expecting to receive all the pre-exist route change on the next onDataTreeChanged() call
338 registerDataChangeListener();
342 * Reset the transaction chain only so that the PingPong transaction chain will become usable again.
343 * However, there will be data loss if we do not apply the previous failed transaction again
346 protected synchronized void resetTransactionChain() {
347 LOG.debug("Resetting transaction chain for topology builder {}", getInstanceIdentifier());
348 destroyTransactionChain();
349 initTransactionChain();
353 * There are a few reasons we want to schedule a listener restart in a delayed manner:
354 * 1. we should avoid restarting the listener as when the topology is big, there might be huge overhead
355 * rebuilding the whole linkstate topology again and again
356 * 2. the #onTransactionChainFailed() normally get invoked after a delay. During that time gap, more
357 * data changes might still be pushed to #onDataTreeChanged(). And because #onTransactionChainFailed()
358 * is not invoked yet, listener restart/transaction chain restart is not done. Thus the new changes
359 * will still cause error and another #onTransactionChainFailed() might be invoked later. The listener
360 * will be restarted again in that case, which is unexpected. Restarting of transaction chain only introduce
361 * little overhead and it's okay to be restarted within a small time window.
362 * Note: when the listener is restarted, we can disregard all the incoming data changes before the restart is
363 * done, as after the listener unregister/reregister, the first #onDataTreeChanged() call will contain the a
364 * complete set of existing changes
366 * @return if the listener get restarted, return true; otherwise false
369 protected synchronized boolean restartTransactionChainOnDemand() {
370 if (this.listenerScheduledRestartTime > 0) {
371 // when the #this.listenerScheduledRestartTime timer timed out we can reset the listener,
372 // otherwise we should only reset the transaction chain
373 if (System.currentTimeMillis() > this.listenerScheduledRestartTime) {
374 // reset the the restart timer
375 this.listenerScheduledRestartTime = 0;
376 this.listenerScheduledRestartEnforceCounter = 0;
381 resetTransactionChain();
387 protected synchronized void scheduleListenerRestart() {
388 if (0 == this.listenerScheduledRestartTime) {
389 this.listenerScheduledRestartTime = System.currentTimeMillis() + this.listenerResetLimitInMillsec;
390 } else if (System.currentTimeMillis() > this.listenerScheduledRestartTime
391 && ++this.listenerScheduledRestartEnforceCounter < this.listenerResetEnforceCounter) {
392 // if the transaction failure happens again, we will delay the listener restart up to
393 // #LISTENER_RESET_LIMIT_IN_MILLSEC times
394 this.listenerScheduledRestartTime += this.listenerResetLimitInMillsec;
396 LOG.debug("A listener restart was scheduled at {} (current system time is {})",
397 this.listenerScheduledRestartTime, System.currentTimeMillis());
401 public final synchronized void onTransactionChainFailed(final TransactionChain<?, ?> transactionChain,
402 final AsyncTransaction<?, ?> transaction, final Throwable cause) {
403 LOG.error("Topology builder for {} failed in transaction {}.", getInstanceIdentifier(),
404 transaction != null ? transaction.getIdentifier() : null, cause);
405 scheduleListenerRestart();
406 restartTransactionChainOnDemand();
410 public final void onTransactionChainSuccessful(final TransactionChain<?, ?> transactionChain) {
411 LOG.info("Topology builder for {} shut down", getInstanceIdentifier());