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.Collections2;
  16 import com.google.common.collect.ImmutableList;
  17 import com.google.common.collect.ImmutableSet;
  18 import com.google.common.collect.ImmutableTable;
  19 import com.google.common.collect.MapDifference;
  20 import com.google.common.collect.MapDifference.ValueDifference;
  21 import com.google.common.collect.Maps;
  22 import com.google.common.collect.Sets;
  23 import com.google.common.util.concurrent.Futures;
  24 import com.google.common.util.concurrent.ListenableFuture;
  25 import com.google.common.util.concurrent.ThreadFactoryBuilder;
  26 import java.util.ArrayList;
  27 import java.util.Collection;
  28 import java.util.HashSet;
  29 import java.util.List;
  30 import java.util.Map;
  31 import java.util.Map.Entry;
  32 import java.util.Set;
  33 import java.util.concurrent.ExecutorService;
  34 import java.util.concurrent.Executors;
  35 import java.util.concurrent.ThreadFactory;
  36 import javax.annotation.PreDestroy;
  37 import javax.inject.Inject;
  38 import javax.inject.Singleton;
  39 import org.checkerframework.checker.lock.qual.GuardedBy;
  40 import org.eclipse.jdt.annotation.NonNull;
  41 import org.eclipse.jdt.annotation.NonNullByDefault;
  42 import org.opendaylight.mdsal.dom.api.DOMActionAvailabilityExtension;
  43 import org.opendaylight.mdsal.dom.api.DOMActionAvailabilityExtension.AvailabilityListener;
  44 import org.opendaylight.mdsal.dom.api.DOMActionImplementation;
  45 import org.opendaylight.mdsal.dom.api.DOMActionInstance;
  46 import org.opendaylight.mdsal.dom.api.DOMActionNotAvailableException;
  47 import org.opendaylight.mdsal.dom.api.DOMActionProviderService;
  48 import org.opendaylight.mdsal.dom.api.DOMActionResult;
  49 import org.opendaylight.mdsal.dom.api.DOMActionService;
  50 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  51 import org.opendaylight.mdsal.dom.api.DOMRpcAvailabilityListener;
  52 import org.opendaylight.mdsal.dom.api.DOMRpcIdentifier;
  53 import org.opendaylight.mdsal.dom.api.DOMRpcImplementation;
  54 import org.opendaylight.mdsal.dom.api.DOMRpcImplementationNotAvailableException;
  55 import org.opendaylight.mdsal.dom.api.DOMRpcImplementationRegistration;
  56 import org.opendaylight.mdsal.dom.api.DOMRpcProviderService;
  57 import org.opendaylight.mdsal.dom.api.DOMRpcResult;
  58 import org.opendaylight.mdsal.dom.api.DOMRpcService;
  59 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  60 import org.opendaylight.mdsal.dom.spi.AbstractDOMRpcImplementationRegistration;
  61 import org.opendaylight.yangtools.concepts.AbstractListenerRegistration;
  62 import org.opendaylight.yangtools.concepts.AbstractObjectRegistration;
  63 import org.opendaylight.yangtools.concepts.AbstractRegistration;
  64 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  65 import org.opendaylight.yangtools.concepts.ObjectRegistration;
  66 import org.opendaylight.yangtools.concepts.Registration;
  67 import org.opendaylight.yangtools.yang.common.QName;
  68 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  69 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  70 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContext;
  71 import org.opendaylight.yangtools.yang.model.api.EffectiveModelContextListener;
  72 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
  73 import org.osgi.service.component.annotations.Activate;
  74 import org.osgi.service.component.annotations.Component;
  75 import org.osgi.service.component.annotations.Deactivate;
  76 import org.osgi.service.component.annotations.Reference;
  77 import org.slf4j.Logger;
  78 import org.slf4j.LoggerFactory;
  79
  80 @Singleton
  81 @Component(service = DOMRpcRouter.class)
  82 public final class DOMRpcRouter extends AbstractRegistration implements EffectiveModelContextListener {
  83     private static final Logger LOG = LoggerFactory.getLogger(DOMRpcRouter.class);
  84     private static final ThreadFactory THREAD_FACTORY = new ThreadFactoryBuilder().setNameFormat(
  85             "DOMRpcRouter-listener-%s").setDaemon(true).build();
  86
  87     private final ExecutorService listenerNotifier = Executors.newSingleThreadExecutor(THREAD_FACTORY);
  88     private final @NonNull DOMActionProviderService actionProviderService = new ActionProviderServiceFacade();
  89     private final @NonNull DOMActionService actionService = new ActionServiceFacade();
  90     private final @NonNull DOMRpcProviderService rpcProviderService = new RpcProviderServiceFacade();
  91     private final @NonNull DOMRpcService rpcService = new RpcServiceFacade();
  92
  93     @GuardedBy("this")
  94     private ImmutableList<RegImpl<?>> listeners = ImmutableList.of();
  95
  96     @GuardedBy("this")
  97     private ImmutableList<ActionRegistration<?>> actionListeners = ImmutableList.of();
  98
  99     private volatile DOMRpcRoutingTable routingTable = DOMRpcRoutingTable.EMPTY;
 100
 101     private volatile DOMActionRoutingTable actionRoutingTable = DOMActionRoutingTable.EMPTY;
 102
 103     private Registration listenerRegistration;
 104
 105     @Deprecated
 106     @VisibleForTesting
 107     // FIXME: 9.0.0: make this constructor package-private
 108     public DOMRpcRouter() {
 109
 110     }
 111
 112     @Inject
 113     @Activate
 114     public DOMRpcRouter(@Reference final DOMSchemaService schemaService) {
 115         listenerRegistration = schemaService.registerSchemaContextListener(this);
 116         LOG.info("DOM RPC/Action router started");
 117     }
 118
 119     @Deprecated(forRemoval = true)
 120     public static DOMRpcRouter newInstance(final DOMSchemaService schemaService) {
 121         return new DOMRpcRouter(schemaService);
 122     }
 123
 124     @PreDestroy
 125     @Deactivate
 126     public void shutdown() {
 127         close();
 128     }
 129
 130     public @NonNull DOMActionService actionService() {
 131         return actionService;
 132     }
 133
 134     public @NonNull DOMActionProviderService actionProviderService() {
 135         return actionProviderService;
 136     }
 137
 138     public @NonNull DOMRpcService rpcService() {
 139         return rpcService;
 140     }
 141
 142     public @NonNull DOMRpcProviderService rpcProviderService() {
 143         return rpcProviderService;
 144     }
 145
 146     private synchronized void removeRpcImplementation(final DOMRpcImplementation implementation,
 147             final Set<DOMRpcIdentifier> rpcs) {
 148         final DOMRpcRoutingTable oldTable = routingTable;
 149         final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.remove(implementation, rpcs);
 150         routingTable = newTable;
 151
 152         listenerNotifier.execute(() -> notifyRemoved(newTable, implementation));
 153     }
 154
 155     private synchronized void removeRpcImplementations(
 156             final ImmutableTable<QName, YangInstanceIdentifier, DOMRpcImplementation> implTable) {
 157         final DOMRpcRoutingTable oldTable = routingTable;
 158         final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.removeAll(implTable);
 159         routingTable = newTable;
 160
 161         listenerNotifier.execute(() -> notifyRemoved(newTable, implTable.values()));
 162     }
 163
 164     private synchronized void removeActionImplementation(final DOMActionImplementation implementation,
 165             final Set<DOMActionInstance> actions) {
 166         final DOMActionRoutingTable oldTable = actionRoutingTable;
 167         final DOMActionRoutingTable newTable = (DOMActionRoutingTable) oldTable.remove(implementation, actions);
 168         actionRoutingTable = newTable;
 169
 170         listenerNotifier.execute(() -> notifyActionChanged(newTable, implementation));
 171     }
 172
 173     private synchronized void removeListener(final ListenerRegistration<? extends DOMRpcAvailabilityListener> reg) {
 174         listeners = ImmutableList.copyOf(Collections2.filter(listeners, input -> !reg.equals(input)));
 175     }
 176
 177     private synchronized void removeActionListener(final ListenerRegistration<? extends AvailabilityListener> reg) {
 178         actionListeners = ImmutableList.copyOf(Collections2.filter(actionListeners, input -> !reg.equals(input)));
 179     }
 180
 181     private synchronized void notifyAdded(final DOMRpcRoutingTable newTable, final DOMRpcImplementation impl) {
 182         for (RegImpl<?> l : listeners) {
 183             l.addRpc(newTable, impl);
 184         }
 185     }
 186
 187     private synchronized void notifyAdded(final DOMRpcRoutingTable newTable,
 188             final Collection<? extends DOMRpcImplementation> impls) {
 189         for (RegImpl<?> l : listeners) {
 190             for (DOMRpcImplementation impl : impls) {
 191                 l.addRpc(newTable, impl);
 192             }
 193         }
 194     }
 195
 196     private synchronized void notifyRemoved(final DOMRpcRoutingTable newTable, final DOMRpcImplementation impl) {
 197         for (RegImpl<?> l : listeners) {
 198             l.removeRpc(newTable, impl);
 199         }
 200     }
 201
 202     private synchronized void notifyRemoved(final DOMRpcRoutingTable newTable,
 203             final Collection<? extends DOMRpcImplementation> impls) {
 204         for (RegImpl<?> l : listeners) {
 205             for (DOMRpcImplementation impl : impls) {
 206                 l.removeRpc(newTable, impl);
 207             }
 208         }
 209     }
 210
 211     private synchronized void notifyActionChanged(final DOMActionRoutingTable newTable,
 212             final DOMActionImplementation impl) {
 213         for (ActionRegistration<?> l : actionListeners) {
 214             l.actionChanged(newTable, impl);
 215         }
 216     }
 217
 218     @Override
 219     public synchronized void onModelContextUpdated(final EffectiveModelContext newModelContext) {
 220         final DOMRpcRoutingTable oldTable = routingTable;
 221         final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.setSchemaContext(newModelContext);
 222         routingTable = newTable;
 223
 224         final DOMActionRoutingTable oldActionTable = actionRoutingTable;
 225         final DOMActionRoutingTable newActionTable =
 226                 (DOMActionRoutingTable) oldActionTable.setSchemaContext(newModelContext);
 227         actionRoutingTable = newActionTable;
 228     }
 229
 230     @Override
 231     protected void removeRegistration() {
 232         if (listenerRegistration != null) {
 233             listenerRegistration.close();
 234             listenerRegistration = null;
 235         }
 236         listenerNotifier.shutdown();
 237         LOG.info("DOM RPC/Action router stopped");
 238     }
 239
 240     @VisibleForTesting
 241     synchronized List<?> listeners() {
 242         return listeners;
 243     }
 244
 245     @VisibleForTesting
 246     synchronized List<?> actionListeners() {
 247         return actionListeners;
 248     }
 249
 250     @VisibleForTesting
 251     DOMRpcRoutingTable routingTable() {
 252         return routingTable;
 253     }
 254
 255     private static final class RegImpl<T extends DOMRpcAvailabilityListener> extends AbstractListenerRegistration<T> {
 256         private Map<QName, Set<YangInstanceIdentifier>> prevRpcs;
 257         private DOMRpcRouter router;
 258
 259         RegImpl(final DOMRpcRouter router, final T listener, final Map<QName, Set<YangInstanceIdentifier>> rpcs) {
 260             super(listener);
 261             this.router = requireNonNull(router);
 262             prevRpcs = requireNonNull(rpcs);
 263         }
 264
 265         @Override
 266         protected void removeRegistration() {
 267             router.removeListener(this);
 268             router = null;
 269         }
 270
 271         void initialTable() {
 272             final List<DOMRpcIdentifier> added = new ArrayList<>();
 273             for (Entry<QName, Set<YangInstanceIdentifier>> e : prevRpcs.entrySet()) {
 274                 added.addAll(Collections2.transform(e.getValue(), i -> DOMRpcIdentifier.create(e.getKey(), i)));
 275             }
 276             if (!added.isEmpty()) {
 277                 getInstance().onRpcAvailable(added);
 278             }
 279         }
 280
 281         void addRpc(final DOMRpcRoutingTable newTable, final DOMRpcImplementation impl) {
 282             final T l = getInstance();
 283             if (!l.acceptsImplementation(impl)) {
 284                 return;
 285             }
 286
 287             final Map<QName, Set<YangInstanceIdentifier>> rpcs = verifyNotNull(newTable.getOperations(l));
 288             final MapDifference<QName, Set<YangInstanceIdentifier>> diff = Maps.difference(prevRpcs, rpcs);
 289
 290             final List<DOMRpcIdentifier> added = new ArrayList<>();
 291             for (Entry<QName, Set<YangInstanceIdentifier>> e : diff.entriesOnlyOnRight().entrySet()) {
 292                 added.addAll(Collections2.transform(e.getValue(), i -> DOMRpcIdentifier.create(e.getKey(), i)));
 293             }
 294             for (Entry<QName, ValueDifference<Set<YangInstanceIdentifier>>> e : diff.entriesDiffering().entrySet()) {
 295                 for (YangInstanceIdentifier i : Sets.difference(e.getValue().rightValue(), e.getValue().leftValue())) {
 296                     added.add(DOMRpcIdentifier.create(e.getKey(), i));
 297                 }
 298             }
 299
 300             prevRpcs = rpcs;
 301             if (!added.isEmpty()) {
 302                 l.onRpcAvailable(added);
 303             }
 304         }
 305
 306         void removeRpc(final DOMRpcRoutingTable newTable, final DOMRpcImplementation impl) {
 307             final T l = getInstance();
 308             if (!l.acceptsImplementation(impl)) {
 309                 return;
 310             }
 311
 312             final Map<QName, Set<YangInstanceIdentifier>> rpcs = verifyNotNull(newTable.getOperations(l));
 313             final MapDifference<QName, Set<YangInstanceIdentifier>> diff = Maps.difference(prevRpcs, rpcs);
 314
 315             final List<DOMRpcIdentifier> removed = new ArrayList<>();
 316             for (Entry<QName, Set<YangInstanceIdentifier>> e : diff.entriesOnlyOnLeft().entrySet()) {
 317                 removed.addAll(Collections2.transform(e.getValue(), i -> DOMRpcIdentifier.create(e.getKey(), i)));
 318             }
 319             for (Entry<QName, ValueDifference<Set<YangInstanceIdentifier>>> e : diff.entriesDiffering().entrySet()) {
 320                 for (YangInstanceIdentifier i : Sets.difference(e.getValue().leftValue(), e.getValue().rightValue())) {
 321                     removed.add(DOMRpcIdentifier.create(e.getKey(), i));
 322                 }
 323             }
 324
 325             prevRpcs = rpcs;
 326             if (!removed.isEmpty()) {
 327                 l.onRpcUnavailable(removed);
 328             }
 329         }
 330     }
 331
 332     // FIXME: just Registration or ObjectRegistration and without generics
 333     private static final class ActionRegistration<T extends AvailabilityListener>
 334         extends AbstractListenerRegistration<T> {
 335
 336         private Map<Absolute, Set<DOMDataTreeIdentifier>> prevActions;
 337         private DOMRpcRouter router;
 338
 339         ActionRegistration(final DOMRpcRouter router, final T listener,
 340                 final Map<Absolute, Set<DOMDataTreeIdentifier>> actions) {
 341             super(listener);
 342             this.router = requireNonNull(router);
 343             prevActions = requireNonNull(actions);
 344         }
 345
 346         @Override
 347         protected void removeRegistration() {
 348             router.removeActionListener(this);
 349             router = null;
 350         }
 351
 352         void initialTable() {
 353             final var added = new ArrayList<DOMActionInstance>();
 354             for (var e : prevActions.entrySet()) {
 355                 added.addAll(Collections2.transform(e.getValue(), i -> DOMActionInstance.of(e.getKey(), i)));
 356             }
 357             if (!added.isEmpty()) {
 358                 getInstance().onActionsChanged(ImmutableSet.of(), ImmutableSet.copyOf(added));
 359             }
 360         }
 361
 362         void actionChanged(final DOMActionRoutingTable newTable, final DOMActionImplementation impl) {
 363             final T l = getInstance();
 364             if (!l.acceptsImplementation(impl)) {
 365                 return;
 366             }
 367
 368             final Map<Absolute, Set<DOMDataTreeIdentifier>> actions = verifyNotNull(newTable.getOperations(l));
 369             final MapDifference<Absolute, Set<DOMDataTreeIdentifier>> diff = Maps.difference(prevActions, actions);
 370
 371             final Set<DOMActionInstance> removed = new HashSet<>();
 372             final Set<DOMActionInstance> added = new HashSet<>();
 373
 374             for (Entry<Absolute, Set<DOMDataTreeIdentifier>> e : diff.entriesOnlyOnLeft().entrySet()) {
 375                 removed.addAll(Collections2.transform(e.getValue(), i -> DOMActionInstance.of(e.getKey(), i)));
 376             }
 377
 378             for (Entry<Absolute, Set<DOMDataTreeIdentifier>> e : diff.entriesOnlyOnRight().entrySet()) {
 379                 added.addAll(Collections2.transform(e.getValue(), i -> DOMActionInstance.of(e.getKey(), i)));
 380             }
 381
 382             for (Entry<Absolute, ValueDifference<Set<DOMDataTreeIdentifier>>> e : diff.entriesDiffering().entrySet()) {
 383                 for (DOMDataTreeIdentifier i : Sets.difference(e.getValue().leftValue(), e.getValue().rightValue())) {
 384                     removed.add(DOMActionInstance.of(e.getKey(), i));
 385                 }
 386
 387                 for (DOMDataTreeIdentifier i : Sets.difference(e.getValue().rightValue(), e.getValue().leftValue())) {
 388                     added.add(DOMActionInstance.of(e.getKey(), i));
 389                 }
 390             }
 391
 392             prevActions = actions;
 393             if (!removed.isEmpty() || !added.isEmpty()) {
 394                 l.onActionsChanged(removed, added);
 395             }
 396         }
 397     }
 398
 399     @NonNullByDefault
 400     private final class ActionServiceFacade implements DOMActionService, DOMActionAvailabilityExtension {
 401         @Override
 402         public List<Extension> supportedExtensions() {
 403             return List.of(this);
 404         }
 405
 406         @Override
 407         public ListenableFuture<? extends DOMActionResult> invokeAction(final Absolute type,
 408                 final DOMDataTreeIdentifier path, final ContainerNode input) {
 409             final YangInstanceIdentifier pathRoot = path.getRootIdentifier();
 410             checkArgument(!pathRoot.isEmpty(), "Action path must not be empty");
 411
 412             final DOMActionRoutingTableEntry entry = (DOMActionRoutingTableEntry) actionRoutingTable.getEntry(type);
 413             return entry != null ? OperationInvocation.invoke(entry, type, path, requireNonNull(input))
 414                 : Futures.immediateFailedFuture(
 415                     new DOMActionNotAvailableException("No implementation of Action %s available", type));
 416         }
 417
 418         @Override
 419         public Registration registerAvailabilityListener(final AvailabilityListener listener) {
 420             synchronized (DOMRpcRouter.this) {
 421                 final var ret = new ActionRegistration<>(DOMRpcRouter.this, listener,
 422                     actionRoutingTable.getOperations(listener));
 423                 actionListeners = ImmutableList.<ActionRegistration<?>>builder()
 424                     .addAll(actionListeners)
 425                     .add(ret)
 426                     .build();
 427
 428                 listenerNotifier.execute(ret::initialTable);
 429                 return ret;
 430             }
 431         }
 432     }
 433
 434     @NonNullByDefault
 435     private final class ActionProviderServiceFacade implements DOMActionProviderService {
 436         @Override
 437         public <T extends DOMActionImplementation> ObjectRegistration<T> registerActionImplementation(
 438                 final T implementation, final Set<DOMActionInstance> instances) {
 439             checkArgument(!instances.isEmpty(), "Instances must not be empty");
 440
 441             synchronized (DOMRpcRouter.this) {
 442                 final DOMActionRoutingTable oldTable = actionRoutingTable;
 443                 final DOMActionRoutingTable newTable = (DOMActionRoutingTable) oldTable.add(implementation, instances);
 444                 actionRoutingTable = newTable;
 445
 446                 listenerNotifier.execute(() -> notifyActionChanged(newTable, implementation));
 447             }
 448
 449             return new AbstractObjectRegistration<>(implementation) {
 450                 @Override
 451                 protected void removeRegistration() {
 452                     removeActionImplementation(getInstance(), instances);
 453                 }
 454             };
 455         }
 456     }
 457
 458     private final class RpcServiceFacade implements DOMRpcService {
 459         @Override
 460         public ListenableFuture<? extends DOMRpcResult> invokeRpc(final QName type, final ContainerNode input) {
 461             final var entry = (AbstractDOMRpcRoutingTableEntry) routingTable.getEntry(type);
 462             if (entry == null) {
 463                 return Futures.immediateFailedFuture(
 464                     new DOMRpcImplementationNotAvailableException("No implementation of RPC %s available", type));
 465             }
 466
 467             return OperationInvocation.invoke(entry, requireNonNull(input));
 468         }
 469
 470         @Override
 471         public Registration registerRpcListener(final DOMRpcAvailabilityListener listener) {
 472             synchronized (DOMRpcRouter.this) {
 473                 final var ret = new RegImpl<>(DOMRpcRouter.this, listener, routingTable.getOperations(listener));
 474                 listeners = ImmutableList.<RegImpl<?>>builder().addAll(listeners).add(ret).build();
 475
 476                 listenerNotifier.execute(ret::initialTable);
 477                 return ret;
 478             }
 479         }
 480     }
 481
 482     private final class RpcProviderServiceFacade implements DOMRpcProviderService {
 483         @Override
 484         public <T extends DOMRpcImplementation> DOMRpcImplementationRegistration<T> registerRpcImplementation(
 485                 final T implementation, final DOMRpcIdentifier... rpcs) {
 486             return registerRpcImplementation(implementation, ImmutableSet.copyOf(rpcs));
 487         }
 488
 489         @Override
 490         public <T extends DOMRpcImplementation> DOMRpcImplementationRegistration<T> registerRpcImplementation(
 491                 final T implementation, final Set<DOMRpcIdentifier> rpcs) {
 492
 493             synchronized (DOMRpcRouter.this) {
 494                 final DOMRpcRoutingTable oldTable = routingTable;
 495                 final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.add(implementation, rpcs);
 496                 routingTable = newTable;
 497
 498                 listenerNotifier.execute(() -> notifyAdded(newTable, implementation));
 499             }
 500
 501             return new AbstractDOMRpcImplementationRegistration<>(implementation) {
 502                 @Override
 503                 protected void removeRegistration() {
 504                     removeRpcImplementation(getInstance(), rpcs);
 505                 }
 506             };
 507         }
 508
 509         @Override
 510         public Registration registerRpcImplementations(final Map<DOMRpcIdentifier, DOMRpcImplementation> map) {
 511             checkArgument(!map.isEmpty());
 512
 513             final var builder = ImmutableTable.<QName, YangInstanceIdentifier, DOMRpcImplementation>builder();
 514             for (var entry : map.entrySet()) {
 515                 final var id = entry.getKey();
 516                 builder.put(id.getType(), id.getContextReference(), entry.getValue());
 517             }
 518             final var implTable = builder.build();
 519
 520             synchronized (DOMRpcRouter.this) {
 521                 final DOMRpcRoutingTable oldTable = routingTable;
 522                 final DOMRpcRoutingTable newTable = (DOMRpcRoutingTable) oldTable.addAll(implTable);
 523                 routingTable = newTable;
 524
 525                 listenerNotifier.execute(() -> notifyAdded(newTable, implTable.values()));
 526             }
 527
 528             return new AbstractRegistration() {
 529                 @Override
 530                 protected void removeRegistration() {
 531                     removeRpcImplementations(implTable);
 532                 }
 533             };
 534         }
 535     }
 536 }