dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/DOMRpcRouter.java

   1 /*
   2  * Copyright (c) 2015 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 package org.opendaylight.mdsal.dom.broker;
   9
  10 import static com.google.common.base.Preconditions.checkArgument;
  11 import static com.google.common.base.Verify.verifyNotNull;
  12 import static java.util.Objects.requireNonNull;
  13
  14 import com.google.common.annotations.VisibleForTesting;
  15 import com.google.common.collect.ClassToInstanceMap;
  16 import com.google.common.collect.Collections2;
  17 import com.google.common.collect.ImmutableClassToInstanceMap;
  18 import com.google.common.collect.ImmutableList;
  19 import com.google.common.collect.ImmutableList.Builder;
  20 import com.google.common.collect.ImmutableMap;
  21 import com.google.common.collect.ImmutableSet;
  22 import com.google.common.collect.MapDifference;
  23 import com.google.common.collect.MapDifference.ValueDifference;
  24 import com.google.common.collect.Maps;
  25 import com.google.common.collect.Sets;
  26 import com.google.common.util.concurrent.Futures;
  27 import com.google.common.util.concurrent.ListenableFuture;
  28 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  29 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
  30 import java.util.ArrayList;
  31 import java.util.Collection;
  32 import java.util.Collections;
  33 import java.util.HashSet;
  34 import java.util.List;
  35 import java.util.Map;
  36 import java.util.Map.Entry;
  37 import java.util.Optional;
  38 import java.util.Set;
  39 import java.util.concurrent.ExecutorService;
  40 import java.util.concurrent.Executors;
  41 import java.util.concurrent.ThreadFactory;
  42 import javax.inject.Inject;
  43 import javax.inject.Singleton;
  44 import org.checkerframework.checker.lock.qual.GuardedBy;
  45 import org.eclipse.jdt.annotation.NonNull;
  46 import org.eclipse.jdt.annotation.NonNullByDefault;
  47 import org.opendaylight.mdsal.dom.api.DOMActionAvailabilityExtension;
  48 import org.opendaylight.mdsal.dom.api.DOMActionAvailabilityExtension.AvailabilityListener;
  49 import org.opendaylight.mdsal.dom.api.DOMActionImplementation;
  50 import org.opendaylight.mdsal.dom.api.DOMActionInstance;
  51 import org.opendaylight.mdsal.dom.api.DOMActionNotAvailableException;
  52 import org.opendaylight.mdsal.dom.api.DOMActionProviderService;
  53 import org.opendaylight.mdsal.dom.api.DOMActionProviderServiceExtension;
  54 import org.opendaylight.mdsal.dom.api.DOMActionResult;
  55 import org.opendaylight.mdsal.dom.api.DOMActionService;
  56 import org.opendaylight.mdsal.dom.api.DOMActionServiceExtension;
  57 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  58 import org.opendaylight.mdsal.dom.api.DOMRpcAvailabilityListener;
  59 import org.opendaylight.mdsal.dom.api.DOMRpcIdentifier;
  60 import org.opendaylight.mdsal.dom.api.DOMRpcImplementation;
  61 import org.opendaylight.mdsal.dom.api.DOMRpcImplementationNotAvailableException;
  62 import org.opendaylight.mdsal.dom.api.DOMRpcImplementationRegistration;
  63 import org.opendaylight.mdsal.dom.api.DOMRpcProviderService;
  64 import org.opendaylight.mdsal.dom.api.DOMRpcResult;
  65 import org.opendaylight.mdsal.dom.api.DOMRpcService;
  66 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  67 import org.opendaylight.mdsal.dom.spi.AbstractDOMRpcImplementationRegistration;
  68 import org.opendaylight.yangtools.concepts.AbstractListenerRegistration;
  69 import org.opendaylight.yangtools.concepts.AbstractObjectRegistration;
  70 import org.opendaylight.yangtools.concepts.AbstractRegistration;
  71 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  72 import org.opendaylight.yangtools.concepts.ObjectRegistration;
  73 import org.opendaylight.yangtools.yang.common.QName;
  74 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  75 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  76 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  77 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNodes;
  78 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  79 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContextListener;
  80 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
  81 import org.slf4j.Logger;
  82 import org.slf4j.LoggerFactory;
  83
  84 @Singleton
  85 public final class DOMRpcRouter extends AbstractRegistration
  86         implements DOMRpcRouterServices, EffectiveModelContextListener {
  87     private static final ThreadFactory THREAD_FACTORY = new ThreadFactoryBuilder().setNameFormat(
  88             "DOMRpcRouter-listener-%s").setDaemon(true).build();
  89
  90     private final ExecutorService listenerNotifier = Executors.newSingleThreadExecutor(THREAD_FACTORY);
  91     private final @NonNull DOMActionProviderService actionProviderService = new ActionProviderServiceFacade();
  92     private final @NonNull DOMActionService actionService = new ActionServiceFacade();
  93     private final @NonNull DOMRpcProviderService rpcProviderService = new RpcProviderServiceFacade();
  94     private final @NonNull DOMRpcService rpcService = new RpcServiceFacade();
  95
  96     @GuardedBy("this")
  97     private Collection<Registration<?>> listeners = Collections.emptyList();
  98
  99     @GuardedBy("this")
 100     private Collection<ActionRegistration<?>> actionListeners = Collections.emptyList();
 101
 102     private volatile DOMRpcRoutingTable routingTable = DOMRpcRoutingTable.EMPTY;
 103
 104     private volatile DOMActionRoutingTable actionRoutingTable = DOMActionRoutingTable.EMPTY;
 105
 106     private ListenerRegistration<?> listenerRegistration;
 107
 108     @Inject
 109     public static DOMRpcRouter newInstance(final DOMSchemaService schemaService) {
 110         final DOMRpcRouter rpcRouter = new DOMRpcRouter();
 111         rpcRouter.listenerRegistration = schemaService.registerSchemaContextListener(rpcRouter);
 112         return rpcRouter;
 113     }
 114
 115     @Override
 116     public DOMActionService getActionService() {
 117         return actionService;
 118     }
 119
 120     @Override
 121     public DOMActionProviderService getActionProviderService() {
 122         return actionProviderService;
 123     }
 124
 125     @Override
 126     public DOMRpcService getRpcService() {
 127         return rpcService;
 128     }
 129
 130     @Override
 131     public DOMRpcProviderService getRpcProviderService() {
 132         return rpcProviderService;
 133     }
 134
 135     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 136             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 137     private synchronized void removeRpcImplementation(final DOMRpcImplementation implementation,
 138             final Set<DOMRpcIdentifier> rpcs) {
 139         final DOMRpcRoutingTable oldTable = routingTable;
 140         final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.remove(implementation, rpcs);
 141         routingTable = newTable;
 142
 143         listenerNotifier.execute(() -> notifyRemoved(newTable, implementation));
 144     }
 145
 146     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 147             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 148     private synchronized void removeRpcImplementations(final Map<DOMRpcIdentifier, DOMRpcImplementation> map) {
 149         final DOMRpcRoutingTable oldTable = routingTable;
 150         final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.removeAll(map);
 151         routingTable = newTable;
 152
 153         listenerNotifier.execute(() -> notifyRemoved(newTable, map.values()));
 154     }
 155
 156     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 157             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 158     private synchronized void removeActionImplementation(final DOMActionImplementation implementation,
 159             final Set<DOMActionInstance> actions) {
 160         final DOMActionRoutingTable oldTable = actionRoutingTable;
 161         final DOMActionRoutingTable newTable = (DOMActionRoutingTable) oldTable.remove(implementation, actions);
 162         actionRoutingTable = newTable;
 163
 164         listenerNotifier.execute(() -> notifyActionChanged(newTable, implementation));
 165     }
 166
 167     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 168             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 169     private synchronized void removeListener(final ListenerRegistration<? extends DOMRpcAvailabilityListener> reg) {
 170         listeners = ImmutableList.copyOf(Collections2.filter(listeners, input -> !reg.equals(input)));
 171     }
 172
 173     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 174             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 175     private synchronized void removeActionListener(final ListenerRegistration<? extends AvailabilityListener> reg) {
 176         actionListeners = ImmutableList.copyOf(Collections2.filter(actionListeners, input -> !reg.equals(input)));
 177     }
 178
 179     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 180             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 181     private synchronized void notifyAdded(final DOMRpcRoutingTable newTable, final DOMRpcImplementation impl) {
 182         for (Registration<?> l : listeners) {
 183             l.addRpc(newTable, impl);
 184         }
 185     }
 186
 187     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 188             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 189     private synchronized void notifyAdded(final DOMRpcRoutingTable newTable,
 190             final Collection<? extends DOMRpcImplementation> impls) {
 191         for (Registration<?> l : listeners) {
 192             for (DOMRpcImplementation impl : impls) {
 193                 l.addRpc(newTable, impl);
 194             }
 195         }
 196     }
 197
 198     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 199             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 200     private synchronized void notifyRemoved(final DOMRpcRoutingTable newTable, final DOMRpcImplementation impl) {
 201         for (Registration<?> l : listeners) {
 202             l.removeRpc(newTable, impl);
 203         }
 204     }
 205
 206     @SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD",
 207             justification = "https://github.com/spotbugs/spotbugs/issues/811")
 208     private synchronized void notifyRemoved(final DOMRpcRoutingTable newTable,
 209             final Collection<? extends DOMRpcImplementation> impls) {
 210         for (Registration<?> l : listeners) {
 211             for (DOMRpcImplementation impl : impls) {
 212                 l.removeRpc(newTable, impl);
 213             }
 214         }
 215     }
 216
 217     private synchronized void notifyActionChanged(final DOMActionRoutingTable newTable,
 218             final DOMActionImplementation impl) {
 219         for (ActionRegistration<?> l : actionListeners) {
 220             l.actionChanged(newTable, impl);
 221         }
 222     }
 223
 224     @Override
 225     public synchronized void onModelContextUpdated(final EffectiveModelContext newModelContext) {
 226         final DOMRpcRoutingTable oldTable = routingTable;
 227         final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.setSchemaContext(newModelContext);
 228         routingTable = newTable;
 229
 230         final DOMActionRoutingTable oldActionTable = actionRoutingTable;
 231         final DOMActionRoutingTable newActionTable =
 232                 (DOMActionRoutingTable) oldActionTable.setSchemaContext(newModelContext);
 233         actionRoutingTable = newActionTable;
 234     }
 235
 236     @Override
 237     protected void removeRegistration() {
 238         if (listenerRegistration != null) {
 239             listenerRegistration.close();
 240             listenerRegistration = null;
 241         }
 242         listenerNotifier.shutdown();
 243     }
 244
 245     @VisibleForTesting
 246     synchronized Collection<?> listeners() {
 247         return listeners;
 248     }
 249
 250     @VisibleForTesting
 251     DOMRpcRoutingTable routingTable() {
 252         return routingTable;
 253     }
 254
 255     private static final class Registration<T extends DOMRpcAvailabilityListener>
 256         extends AbstractListenerRegistration<T> {
 257
 258         private Map<QName, Set<YangInstanceIdentifier>> prevRpcs;
 259         private DOMRpcRouter router;
 260
 261         Registration(final DOMRpcRouter router, final T listener, final Map<QName, Set<YangInstanceIdentifier>> rpcs) {
 262             super(listener);
 263             this.router = requireNonNull(router);
 264             this.prevRpcs = requireNonNull(rpcs);
 265         }
 266
 267         @Override
 268         protected void removeRegistration() {
 269             router.removeListener(this);
 270             router = null;
 271         }
 272
 273         void initialTable() {
 274             final Collection<DOMRpcIdentifier> added = new ArrayList<>();
 275             for (Entry<QName, Set<YangInstanceIdentifier>> e : prevRpcs.entrySet()) {
 276                 added.addAll(Collections2.transform(e.getValue(), i -> DOMRpcIdentifier.create(e.getKey(), i)));
 277             }
 278             if (!added.isEmpty()) {
 279                 getInstance().onRpcAvailable(added);
 280             }
 281         }
 282
 283         void addRpc(final DOMRpcRoutingTable newTable, final DOMRpcImplementation impl) {
 284             final T l = getInstance();
 285             if (!l.acceptsImplementation(impl)) {
 286                 return;
 287             }
 288
 289             final Map<QName, Set<YangInstanceIdentifier>> rpcs = verifyNotNull(newTable.getOperations(l));
 290             final MapDifference<QName, Set<YangInstanceIdentifier>> diff = Maps.difference(prevRpcs, rpcs);
 291
 292             final Collection<DOMRpcIdentifier> added = new ArrayList<>();
 293             for (Entry<QName, Set<YangInstanceIdentifier>> e : diff.entriesOnlyOnRight().entrySet()) {
 294                 added.addAll(Collections2.transform(e.getValue(), i -> DOMRpcIdentifier.create(e.getKey(), i)));
 295             }
 296             for (Entry<QName, ValueDifference<Set<YangInstanceIdentifier>>> e : diff.entriesDiffering().entrySet()) {
 297                 for (YangInstanceIdentifier i : Sets.difference(e.getValue().rightValue(), e.getValue().leftValue())) {
 298                     added.add(DOMRpcIdentifier.create(e.getKey(), i));
 299                 }
 300             }
 301
 302             prevRpcs = rpcs;
 303             if (!added.isEmpty()) {
 304                 l.onRpcAvailable(added);
 305             }
 306         }
 307
 308         void removeRpc(final DOMRpcRoutingTable newTable, final DOMRpcImplementation impl) {
 309             final T l = getInstance();
 310             if (!l.acceptsImplementation(impl)) {
 311                 return;
 312             }
 313
 314             final Map<QName, Set<YangInstanceIdentifier>> rpcs = verifyNotNull(newTable.getOperations(l));
 315             final MapDifference<QName, Set<YangInstanceIdentifier>> diff = Maps.difference(prevRpcs, rpcs);
 316
 317             final Collection<DOMRpcIdentifier> removed = new ArrayList<>();
 318             for (Entry<QName, Set<YangInstanceIdentifier>> e : diff.entriesOnlyOnLeft().entrySet()) {
 319                 removed.addAll(Collections2.transform(e.getValue(), i -> DOMRpcIdentifier.create(e.getKey(), i)));
 320             }
 321             for (Entry<QName, ValueDifference<Set<YangInstanceIdentifier>>> e : diff.entriesDiffering().entrySet()) {
 322                 for (YangInstanceIdentifier i : Sets.difference(e.getValue().leftValue(), e.getValue().rightValue())) {
 323                     removed.add(DOMRpcIdentifier.create(e.getKey(), i));
 324                 }
 325             }
 326
 327             prevRpcs = rpcs;
 328             if (!removed.isEmpty()) {
 329                 l.onRpcUnavailable(removed);
 330             }
 331         }
 332     }
 333
 334     private static final class ActionRegistration<T extends AvailabilityListener>
 335         extends AbstractListenerRegistration<T> {
 336
 337         private Map<Absolute, Set<DOMDataTreeIdentifier>> prevActions;
 338         private DOMRpcRouter router;
 339
 340         ActionRegistration(final DOMRpcRouter router, final T listener,
 341                 final Map<Absolute, Set<DOMDataTreeIdentifier>> actions) {
 342             super(listener);
 343             this.router = requireNonNull(router);
 344             this.prevActions = requireNonNull(actions);
 345         }
 346
 347         @Override
 348         protected void removeRegistration() {
 349             router.removeActionListener(this);
 350             router = null;
 351         }
 352
 353         void initialTable() {
 354             final Collection<DOMActionInstance> added = new ArrayList<>();
 355             for (Entry<Absolute, Set<DOMDataTreeIdentifier>> e : prevActions.entrySet()) {
 356                 added.addAll(Collections2.transform(e.getValue(), i -> DOMActionInstance.of(e.getKey(), i)));
 357             }
 358             if (!added.isEmpty()) {
 359                 getInstance().onActionsChanged(ImmutableSet.of(), ImmutableSet.copyOf(added));
 360             }
 361         }
 362
 363         void actionChanged(final DOMActionRoutingTable newTable, final DOMActionImplementation impl) {
 364             final T l = getInstance();
 365             if (!l.acceptsImplementation(impl)) {
 366                 return;
 367             }
 368
 369             final Map<Absolute, Set<DOMDataTreeIdentifier>> actions = verifyNotNull(newTable.getOperations(l));
 370             final MapDifference<Absolute, Set<DOMDataTreeIdentifier>> diff = Maps.difference(prevActions, actions);
 371
 372             final Set<DOMActionInstance> removed = new HashSet<>();
 373             final Set<DOMActionInstance> added = new HashSet<>();
 374
 375             for (Entry<Absolute, Set<DOMDataTreeIdentifier>> e : diff.entriesOnlyOnLeft().entrySet()) {
 376                 removed.addAll(Collections2.transform(e.getValue(), i -> DOMActionInstance.of(e.getKey(), i)));
 377             }
 378
 379             for (Entry<Absolute, Set<DOMDataTreeIdentifier>> e : diff.entriesOnlyOnRight().entrySet()) {
 380                 added.addAll(Collections2.transform(e.getValue(), i -> DOMActionInstance.of(e.getKey(), i)));
 381             }
 382
 383             for (Entry<Absolute, ValueDifference<Set<DOMDataTreeIdentifier>>> e : diff.entriesDiffering().entrySet()) {
 384                 for (DOMDataTreeIdentifier i : Sets.difference(e.getValue().leftValue(), e.getValue().rightValue())) {
 385                     removed.add(DOMActionInstance.of(e.getKey(), i));
 386                 }
 387
 388                 for (DOMDataTreeIdentifier i : Sets.difference(e.getValue().rightValue(), e.getValue().leftValue())) {
 389                     added.add(DOMActionInstance.of(e.getKey(), i));
 390                 }
 391             }
 392
 393             prevActions = actions;
 394             if (!removed.isEmpty() || !added.isEmpty()) {
 395                 l.onActionsChanged(removed, added);
 396             }
 397         }
 398     }
 399
 400     @NonNullByDefault
 401     private final class ActionAvailabilityFacade implements DOMActionAvailabilityExtension {
 402         @Override
 403         public <T extends AvailabilityListener> ListenerRegistration<T> registerAvailabilityListener(final T listener) {
 404             synchronized (DOMRpcRouter.this) {
 405                 final ActionRegistration<T> ret = new ActionRegistration<>(DOMRpcRouter.this,
 406                     listener, actionRoutingTable.getOperations(listener));
 407                 final Builder<ActionRegistration<?>> b = ImmutableList.builder();
 408                 b.addAll(actionListeners);
 409                 b.add(ret);
 410                 actionListeners = b.build();
 411
 412                 listenerNotifier.execute(ret::initialTable);
 413                 return ret;
 414             }
 415         }
 416     }
 417
 418     @NonNullByDefault
 419     private final class ActionServiceFacade implements DOMActionService {
 420         private final ClassToInstanceMap<DOMActionServiceExtension> extensions = ImmutableClassToInstanceMap.of(
 421             DOMActionAvailabilityExtension.class, new ActionAvailabilityFacade());
 422
 423         @Override
 424         public ClassToInstanceMap<DOMActionServiceExtension> getExtensions() {
 425             return extensions;
 426         }
 427
 428         @Override
 429         public ListenableFuture<? extends DOMActionResult> invokeAction(final Absolute type,
 430                 final DOMDataTreeIdentifier path, final ContainerNode input) {
 431             final DOMActionRoutingTableEntry entry = (DOMActionRoutingTableEntry) actionRoutingTable.getEntry(type);
 432             if (entry == null) {
 433                 return Futures.immediateFailedFuture(
 434                     new DOMActionNotAvailableException("No implementation of Action %s available", type));
 435             }
 436
 437             return OperationInvocation.invoke(entry, type, path, requireNonNull(input));
 438         }
 439     }
 440
 441     @NonNullByDefault
 442     private final class ActionProviderServiceFacade implements DOMActionProviderService {
 443         @Override
 444         public ClassToInstanceMap<DOMActionProviderServiceExtension> getExtensions() {
 445             return ImmutableClassToInstanceMap.of();
 446         }
 447
 448         @Override
 449         public <T extends DOMActionImplementation> ObjectRegistration<T> registerActionImplementation(
 450             final T implementation, final Set<DOMActionInstance> instances) {
 451
 452             synchronized (DOMRpcRouter.this) {
 453                 final DOMActionRoutingTable oldTable = actionRoutingTable;
 454                 final DOMActionRoutingTable newTable = (DOMActionRoutingTable) oldTable.add(implementation, instances);
 455                 actionRoutingTable = newTable;
 456
 457                 listenerNotifier.execute(() -> notifyActionChanged(newTable, implementation));
 458             }
 459
 460             return new AbstractObjectRegistration<>(implementation) {
 461                 @Override
 462                 protected void removeRegistration() {
 463                     removeActionImplementation(getInstance(), instances);
 464                 }
 465             };
 466         }
 467     }
 468
 469     private final class RpcServiceFacade implements DOMRpcService {
 470         @Override
 471         public ListenableFuture<? extends DOMRpcResult> invokeRpc(final QName type, final NormalizedNode<?, ?> input) {
 472             final AbstractDOMRpcRoutingTableEntry entry = (AbstractDOMRpcRoutingTableEntry) routingTable.getEntry(type);
 473             if (entry == null) {
 474                 return Futures.immediateFailedFuture(
 475                     new DOMRpcImplementationNotAvailableException("No implementation of RPC %s available", type));
 476             }
 477
 478             return OperationInvocation.invoke(entry, requireNonNull(input));
 479         }
 480
 481         @Override
 482         public <T extends DOMRpcAvailabilityListener> ListenerRegistration<T> registerRpcListener(final T listener) {
 483             synchronized (DOMRpcRouter.this) {
 484                 final Registration<T> ret = new Registration<>(DOMRpcRouter.this, listener,
 485                     routingTable.getOperations(listener));
 486                 final Builder<Registration<?>> b = ImmutableList.builder();
 487                 b.addAll(listeners);
 488                 b.add(ret);
 489                 listeners = b.build();
 490
 491                 listenerNotifier.execute(ret::initialTable);
 492                 return ret;
 493             }
 494         }
 495     }
 496
 497     private final class RpcProviderServiceFacade implements DOMRpcProviderService {
 498         @Override
 499         public <T extends DOMRpcImplementation> DOMRpcImplementationRegistration<T> registerRpcImplementation(
 500                 final T implementation, final DOMRpcIdentifier... rpcs) {
 501             return registerRpcImplementation(implementation, ImmutableSet.copyOf(rpcs));
 502         }
 503
 504         @Override
 505         public <T extends DOMRpcImplementation> DOMRpcImplementationRegistration<T> registerRpcImplementation(
 506                 final T implementation, final Set<DOMRpcIdentifier> rpcs) {
 507
 508             synchronized (DOMRpcRouter.this) {
 509                 final DOMRpcRoutingTable oldTable = routingTable;
 510                 final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.add(implementation, rpcs);
 511                 routingTable = newTable;
 512
 513                 listenerNotifier.execute(() -> notifyAdded(newTable, implementation));
 514             }
 515
 516             return new AbstractDOMRpcImplementationRegistration<>(implementation) {
 517                 @Override
 518                 protected void removeRegistration() {
 519                     removeRpcImplementation(getInstance(), rpcs);
 520                 }
 521             };
 522         }
 523
 524         @Override
 525         public org.opendaylight.yangtools.concepts.Registration registerRpcImplementations(
 526                 final Map<DOMRpcIdentifier, DOMRpcImplementation> map) {
 527             final ImmutableMap<DOMRpcIdentifier, DOMRpcImplementation> defensive = ImmutableMap.copyOf(map);
 528             checkArgument(!map.isEmpty());
 529
 530             synchronized (DOMRpcRouter.this) {
 531                 final DOMRpcRoutingTable oldTable = routingTable;
 532                 final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.addAll(defensive);
 533                 routingTable = newTable;
 534
 535                 listenerNotifier.execute(() -> notifyAdded(newTable, defensive.values()));
 536             }
 537
 538             return new AbstractRegistration() {
 539                 @Override
 540                 protected void removeRegistration() {
 541                     removeRpcImplementations(defensive);
 542                 }
 543             };
 544         }
 545     }
 546
 547     static final class OperationInvocation {
 548         private static final Logger LOG = LoggerFactory.getLogger(OperationInvocation.class);
 549
 550         static ListenableFuture<? extends DOMActionResult> invoke(final DOMActionRoutingTableEntry entry,
 551                 final Absolute type, final DOMDataTreeIdentifier path, final ContainerNode input) {
 552             return entry.getImplementations(path).get(0).invokeAction(type, path, input);
 553         }
 554
 555         static ListenableFuture<? extends DOMRpcResult> invoke(final AbstractDOMRpcRoutingTableEntry entry,
 556                 final NormalizedNode<?, ?> input) {
 557             if (entry instanceof UnknownDOMRpcRoutingTableEntry) {
 558                 return Futures.immediateFailedFuture(
 559                     new DOMRpcImplementationNotAvailableException("%s is not resolved to an RPC", entry.getType()));
 560             } else if (entry instanceof RoutedDOMRpcRoutingTableEntry) {
 561                 return invokeRoutedRpc((RoutedDOMRpcRoutingTableEntry) entry, input);
 562             } else if (entry instanceof GlobalDOMRpcRoutingTableEntry) {
 563                 return invokeGlobalRpc((GlobalDOMRpcRoutingTableEntry) entry, input);
 564             }
 565
 566             return Futures.immediateFailedFuture(
 567                 new DOMRpcImplementationNotAvailableException("Unsupported RPC entry."));
 568         }
 569
 570         private static ListenableFuture<? extends DOMRpcResult> invokeRoutedRpc(
 571                 final RoutedDOMRpcRoutingTableEntry entry, final NormalizedNode<?, ?> input) {
 572             final Optional<NormalizedNode<?, ?>> maybeKey = NormalizedNodes.findNode(input,
 573                 entry.getRpcId().getContextReference());
 574
 575             // Routing key is present, attempt to deliver as a routed RPC
 576             if (maybeKey.isPresent()) {
 577                 final NormalizedNode<?, ?> key = maybeKey.get();
 578                 final Object value = key.getValue();
 579                 if (value instanceof YangInstanceIdentifier) {
 580                     final YangInstanceIdentifier iid = (YangInstanceIdentifier) value;
 581
 582                     // Find a DOMRpcImplementation for a specific iid
 583                     final List<DOMRpcImplementation> specificImpls = entry.getImplementations(iid);
 584                     if (specificImpls != null) {
 585                         return specificImpls.get(0)
 586                             .invokeRpc(DOMRpcIdentifier.create(entry.getType(), iid), input);
 587                     }
 588
 589                     LOG.debug("No implementation for context {} found will now look for wildcard id", iid);
 590
 591                     // Find a DOMRpcImplementation for a wild card. Usually remote-rpc-connector would register an
 592                     // implementation this way
 593                     final List<DOMRpcImplementation> mayBeRemoteImpls =
 594                         entry.getImplementations(YangInstanceIdentifier.empty());
 595
 596                     if (mayBeRemoteImpls != null) {
 597                         return mayBeRemoteImpls.get(0)
 598                             .invokeRpc(DOMRpcIdentifier.create(entry.getType(), iid), input);
 599                     }
 600
 601                 } else {
 602                     LOG.warn("Ignoring wrong context value {}", value);
 603                 }
 604             }
 605
 606             final List<DOMRpcImplementation> impls = entry.getImplementations(null);
 607             if (impls != null) {
 608                 return impls.get(0).invokeRpc(entry.getRpcId(), input);
 609             }
 610
 611             return Futures.immediateFailedFuture(
 612                 new DOMRpcImplementationNotAvailableException("No implementation of RPC %s available",
 613                     entry.getType()));
 614         }
 615
 616         private static ListenableFuture<? extends DOMRpcResult> invokeGlobalRpc(
 617                 final GlobalDOMRpcRoutingTableEntry entry, final NormalizedNode<?, ?> input) {
 618             return entry.getImplementations(YangInstanceIdentifier.empty()).get(0).invokeRpc(entry.getRpcId(), input);
 619         }
 620     }
 621 }