binding/mdsal-binding-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/dom/adapter/BindingToNormalizedNodeCodec.java

   1 /*
   2  * Copyright (c) 2014 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.binding.dom.adapter;
   9
  10 import static com.google.common.base.Preconditions.checkArgument;
  11 import static com.google.common.base.Preconditions.checkState;
  12 import static java.util.Objects.requireNonNull;
  13
  14 import com.google.common.cache.CacheBuilder;
  15 import com.google.common.cache.CacheLoader;
  16 import com.google.common.cache.LoadingCache;
  17 import com.google.common.collect.ImmutableBiMap;
  18 import com.google.common.collect.ImmutableSet;
  19 import com.google.common.collect.Iterators;
  20 import java.lang.reflect.Method;
  21 import java.time.Instant;
  22 import java.util.AbstractMap.SimpleEntry;
  23 import java.util.Collection;
  24 import java.util.HashSet;
  25 import java.util.Map.Entry;
  26 import java.util.Optional;
  27 import java.util.Set;
  28 import java.util.concurrent.TimeUnit;
  29 import java.util.function.Function;
  30 import java.util.stream.Collectors;
  31 import javax.annotation.PreDestroy;
  32 import javax.inject.Inject;
  33 import javax.inject.Singleton;
  34 import org.eclipse.jdt.annotation.NonNull;
  35 import org.opendaylight.mdsal.binding.api.DataTreeIdentifier;
  36 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTree;
  37 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTreeFactory;
  38 import org.opendaylight.mdsal.binding.dom.codec.api.BindingCodecTreeNode;
  39 import org.opendaylight.mdsal.binding.dom.codec.api.BindingDataObjectCodecTreeNode;
  40 import org.opendaylight.mdsal.binding.dom.codec.api.BindingLazyContainerNode;
  41 import org.opendaylight.mdsal.binding.dom.codec.api.BindingNormalizedNodeSerializer;
  42 import org.opendaylight.mdsal.binding.dom.codec.impl.BindingNormalizedNodeCodecRegistry;
  43 import org.opendaylight.mdsal.binding.dom.codec.impl.MissingSchemaException;
  44 import org.opendaylight.mdsal.binding.generator.api.ClassLoadingStrategy;
  45 import org.opendaylight.mdsal.binding.generator.util.BindingRuntimeContext;
  46 import org.opendaylight.mdsal.binding.spec.naming.BindingMapping;
  47 import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
  48 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
  49 import org.opendaylight.mdsal.dom.api.DOMSchemaService;
  50 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  51 import org.opendaylight.yangtools.yang.binding.Action;
  52 import org.opendaylight.yangtools.yang.binding.DataContainer;
  53 import org.opendaylight.yangtools.yang.binding.DataObject;
  54 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  55 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier.PathArgument;
  56 import org.opendaylight.yangtools.yang.binding.Notification;
  57 import org.opendaylight.yangtools.yang.binding.RpcInput;
  58 import org.opendaylight.yangtools.yang.binding.RpcOutput;
  59 import org.opendaylight.yangtools.yang.binding.RpcService;
  60 import org.opendaylight.yangtools.yang.common.QNameModule;
  61 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  62 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifier;
  63 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
  64 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  65 import org.opendaylight.yangtools.yang.data.impl.codec.DeserializationException;
  66 import org.opendaylight.yangtools.yang.data.impl.schema.Builders;
  67 import org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes;
  68 import org.opendaylight.yangtools.yang.model.api.ActionDefinition;
  69 import org.opendaylight.yangtools.yang.model.api.DocumentedNode.WithStatus;
  70 import org.opendaylight.yangtools.yang.model.api.ListSchemaNode;
  71 import org.opendaylight.yangtools.yang.model.api.Module;
  72 import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
  73 import org.opendaylight.yangtools.yang.model.api.RpcDefinition;
  74 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
  75 import org.opendaylight.yangtools.yang.model.api.SchemaContextListener;
  76 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  77 import org.slf4j.Logger;
  78 import org.slf4j.LoggerFactory;
  79
  80 /**
  81  * A combinations of {@link BindingCodecTreeFactory} and {@link BindingNormalizedNodeSerializer}, with internal
  82  * caching of instance identifiers.
  83  *
  84  * <p>
  85  * NOTE: this class is non-final to allow controller adapter migration without duplicated code.
  86  */
  87 @Singleton
  88 public class BindingToNormalizedNodeCodec implements BindingCodecTreeFactory,
  89         BindingNormalizedNodeSerializer, SchemaContextListener, AutoCloseable {
  90
  91     private static final long WAIT_DURATION_SEC = 5;
  92     private static final Logger LOG = LoggerFactory.getLogger(BindingToNormalizedNodeCodec.class);
  93
  94     private final LoadingCache<InstanceIdentifier<?>, YangInstanceIdentifier> iiCache = CacheBuilder.newBuilder()
  95             .softValues().build(new CacheLoader<InstanceIdentifier<?>, YangInstanceIdentifier>() {
  96                 @Override
  97                 public YangInstanceIdentifier load(final InstanceIdentifier<?> key) {
  98                     return toYangInstanceIdentifierBlocking(key);
  99                 }
 100             });
 101     private final BindingNormalizedNodeCodecRegistry codecRegistry;
 102     private final ClassLoadingStrategy classLoadingStrategy;
 103     private final FutureSchema futureSchema;
 104     private ListenerRegistration<?> listenerRegistration;
 105
 106     @Inject
 107     public BindingToNormalizedNodeCodec(final ClassLoadingStrategy classLoadingStrategy,
 108             final BindingNormalizedNodeCodecRegistry codecRegistry) {
 109         this(classLoadingStrategy, codecRegistry, false);
 110     }
 111
 112     public BindingToNormalizedNodeCodec(final ClassLoadingStrategy classLoadingStrategy,
 113             final BindingNormalizedNodeCodecRegistry codecRegistry, final boolean waitForSchema) {
 114         this.classLoadingStrategy = requireNonNull(classLoadingStrategy, "classLoadingStrategy");
 115         this.codecRegistry = requireNonNull(codecRegistry, "codecRegistry");
 116         this.futureSchema = FutureSchema.create(WAIT_DURATION_SEC, TimeUnit.SECONDS, waitForSchema);
 117     }
 118
 119     public static BindingToNormalizedNodeCodec newInstance(final ClassLoadingStrategy classLoadingStrategy,
 120             final DOMSchemaService schemaService) {
 121         final BindingNormalizedNodeCodecRegistry codecRegistry = new BindingNormalizedNodeCodecRegistry();
 122         BindingToNormalizedNodeCodec instance = new BindingToNormalizedNodeCodec(
 123                 classLoadingStrategy, codecRegistry, true);
 124         instance.listenerRegistration = schemaService.registerSchemaContextListener(instance);
 125         return instance;
 126     }
 127
 128     protected YangInstanceIdentifier toYangInstanceIdentifierBlocking(
 129             final InstanceIdentifier<? extends DataObject> binding) {
 130         try {
 131             return codecRegistry.toYangInstanceIdentifier(binding);
 132         } catch (final MissingSchemaException e) {
 133             waitForSchema(decompose(binding), e);
 134             return codecRegistry.toYangInstanceIdentifier(binding);
 135         }
 136     }
 137
 138     /**
 139      * Translates supplied Binding Instance Identifier into NormalizedNode
 140      * instance identifier.
 141      *
 142      * @param binding
 143      *            Binding Instance Identifier
 144      * @return DOM Instance Identifier
 145      * @throws IllegalArgumentException
 146      *             If supplied Instance Identifier is not valid.
 147      */
 148     public final YangInstanceIdentifier toNormalized(final InstanceIdentifier<? extends DataObject> binding) {
 149         return codecRegistry.toYangInstanceIdentifier(binding);
 150     }
 151
 152     @Override
 153     public final YangInstanceIdentifier toYangInstanceIdentifier(final InstanceIdentifier<?> binding) {
 154         return codecRegistry.toYangInstanceIdentifier(binding);
 155     }
 156
 157     protected YangInstanceIdentifier toYangInstanceIdentifierCached(final InstanceIdentifier<?> binding) {
 158         return iiCache.getUnchecked(binding);
 159     }
 160
 161     @Override
 162     public final <T extends DataObject> Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> toNormalizedNode(
 163             final InstanceIdentifier<T> path, final T data) {
 164         try {
 165             return codecRegistry.toNormalizedNode(path, data);
 166         } catch (final MissingSchemaException e) {
 167             waitForSchema(decompose(path), e);
 168             return codecRegistry.toNormalizedNode(path, data);
 169         }
 170     }
 171
 172     /**
 173      * Converts Binding Map.Entry to DOM Map.Entry.
 174      *
 175      * <p>
 176      * Same as {@link #toNormalizedNode(InstanceIdentifier, DataObject)}.
 177      *
 178      * @param binding Map Entry with InstanceIdentifier as key and DataObject as value.
 179      * @return DOM Map Entry with {@link YangInstanceIdentifier} as key and {@link NormalizedNode}
 180      *         as value.
 181      */
 182     @SuppressWarnings({"unchecked", "rawtypes"})
 183     public final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> toNormalizedNode(
 184             final Entry<InstanceIdentifier<? extends DataObject>, DataObject> binding) {
 185         return toNormalizedNode((InstanceIdentifier) binding.getKey(), binding.getValue());
 186     }
 187
 188     @Override
 189     public final Entry<InstanceIdentifier<?>, DataObject> fromNormalizedNode(final YangInstanceIdentifier path,
 190             final NormalizedNode<?, ?> data) {
 191         return codecRegistry.fromNormalizedNode(path, data);
 192     }
 193
 194     @Override
 195     public final Notification fromNormalizedNodeNotification(final SchemaPath path, final ContainerNode data) {
 196         return codecRegistry.fromNormalizedNodeNotification(path, data);
 197     }
 198
 199     @Override
 200     public final Notification fromNormalizedNodeNotification(final SchemaPath path, final ContainerNode data,
 201             final Instant eventInstant) {
 202         return codecRegistry.fromNormalizedNodeNotification(path, data, eventInstant);
 203     }
 204
 205     @Override
 206     public final DataObject fromNormalizedNodeRpcData(final SchemaPath path, final ContainerNode data) {
 207         return codecRegistry.fromNormalizedNodeRpcData(path, data);
 208     }
 209
 210     @Override
 211     public <T extends RpcInput> T fromNormalizedNodeActionInput(final Class<? extends Action<?, ?, ?>> action,
 212             final ContainerNode input) {
 213         return codecRegistry.fromNormalizedNodeActionInput(action, input);
 214     }
 215
 216     @Override
 217     public <T extends RpcOutput> T fromNormalizedNodeActionOutput(final Class<? extends Action<?, ?, ?>> action,
 218             final ContainerNode output) {
 219         return codecRegistry.fromNormalizedNodeActionOutput(action, output);
 220     }
 221
 222     @Override
 223     public final InstanceIdentifier<?> fromYangInstanceIdentifier(final YangInstanceIdentifier dom) {
 224         return codecRegistry.fromYangInstanceIdentifier(dom);
 225     }
 226
 227     @Override
 228     public final ContainerNode toNormalizedNodeNotification(final Notification data) {
 229         return codecRegistry.toNormalizedNodeNotification(data);
 230     }
 231
 232     @Override
 233     public final ContainerNode toNormalizedNodeRpcData(final DataContainer data) {
 234         return codecRegistry.toNormalizedNodeRpcData(data);
 235     }
 236
 237     @Override
 238     public ContainerNode toNormalizedNodeActionInput(final Class<? extends Action<?, ?, ?>> action,
 239             final RpcInput input) {
 240         return codecRegistry.toNormalizedNodeActionInput(action, input);
 241     }
 242
 243     @Override
 244     public ContainerNode toNormalizedNodeActionOutput(final Class<? extends Action<?, ?, ?>> action,
 245             final RpcOutput output) {
 246         return codecRegistry.toNormalizedNodeActionOutput(action, output);
 247     }
 248
 249     @Override
 250     public BindingLazyContainerNode<RpcInput> toLazyNormalizedNodeActionInput(
 251             final Class<? extends Action<?, ?, ?>> action, final NodeIdentifier identifier, final RpcInput input) {
 252         return codecRegistry.toLazyNormalizedNodeActionInput(action, identifier, input);
 253     }
 254
 255     @Override
 256     public BindingLazyContainerNode<RpcOutput> toLazyNormalizedNodeActionOutput(
 257             final Class<? extends Action<?, ?, ?>> action, final NodeIdentifier identifier, final RpcOutput output) {
 258         return codecRegistry.toLazyNormalizedNodeActionOutput(action, identifier, output);
 259     }
 260
 261     /**
 262      * Returns a Binding-Aware instance identifier from normalized
 263      * instance-identifier if it is possible to create representation.
 264      *
 265      * <p>
 266      * Returns Optional.empty for cases where target is mixin node except
 267      * augmentation.
 268      */
 269     public final Optional<InstanceIdentifier<? extends DataObject>> toBinding(final YangInstanceIdentifier normalized)
 270                     throws DeserializationException {
 271         try {
 272             return Optional.ofNullable(codecRegistry.fromYangInstanceIdentifier(normalized));
 273         } catch (final IllegalArgumentException e) {
 274             return Optional.empty();
 275         }
 276     }
 277
 278     public final Optional<Entry<InstanceIdentifier<? extends DataObject>, DataObject>> toBinding(
 279             final @NonNull Entry<YangInstanceIdentifier, ? extends NormalizedNode<?, ?>> normalized)
 280                     throws DeserializationException {
 281         try {
 282             /*
 283              * This cast is required, due to generics behaviour in openjdk / oracle javac.
 284              *
 285              * <p>
 286              * InstanceIdentifier has definition InstanceIdentifier<T extends DataObject>,
 287              * this means '?' is always  <? extends DataObject>. Eclipse compiler
 288              * is able to determine this relationship and treats
 289              * Entry<InstanceIdentifier<?>, DataObject> and Entry<InstanceIdentifier<? extends DataObject, DataObject>
 290              * as assignable. However openjdk / oracle javac treats this two types
 291              * as incompatible and issues a compile error.
 292              *
 293              * <p>
 294              * It is safe to lose generic information and cast it to other generic signature.
 295              */
 296             @SuppressWarnings("unchecked")
 297             final Entry<InstanceIdentifier<? extends DataObject>, DataObject> binding = Entry.class.cast(
 298                     codecRegistry.fromNormalizedNode(normalized.getKey(), normalized.getValue()));
 299             return Optional.ofNullable(binding);
 300         } catch (final IllegalArgumentException e) {
 301             return Optional.empty();
 302         }
 303     }
 304
 305     @Override
 306     public void onGlobalContextUpdated(final SchemaContext context) {
 307         final BindingRuntimeContext runtimeContext = BindingRuntimeContext.create(classLoadingStrategy, context);
 308         codecRegistry.onBindingRuntimeContextUpdated(runtimeContext);
 309         futureSchema.onRuntimeContextUpdated(runtimeContext);
 310     }
 311
 312     /**
 313      * Deprecated.
 314      *
 315      * @deprecated Use {@link BindingNormalizedNodeCodecRegistry#deserializeFunction} instead.
 316      */
 317     @Deprecated
 318     public final <T extends DataObject> Function<Optional<NormalizedNode<?, ?>>, Optional<T>> deserializeFunction(
 319             final InstanceIdentifier<T> path) {
 320         return codecRegistry.deserializeFunction(path)::apply;
 321     }
 322
 323     public final BindingNormalizedNodeCodecRegistry getCodecRegistry() {
 324         return codecRegistry;
 325     }
 326
 327     @Override
 328     @PreDestroy
 329     public void close() {
 330         if (listenerRegistration != null) {
 331             listenerRegistration.close();
 332         }
 333     }
 334
 335     public final BindingNormalizedNodeCodecRegistry getCodecFactory() {
 336         return codecRegistry;
 337     }
 338
 339     // FIXME: This should be probably part of Binding Runtime context
 340     public final ImmutableBiMap<Method, SchemaPath> getRpcMethodToSchemaPath(final Class<? extends RpcService> key) {
 341         final Module module = getModuleBlocking(key);
 342         final ImmutableBiMap.Builder<Method, SchemaPath> ret = ImmutableBiMap.builder();
 343         try {
 344             for (final RpcDefinition rpcDef : module.getRpcs()) {
 345                 final Method method = findRpcMethod(key, rpcDef);
 346                 ret.put(method, rpcDef.getPath());
 347             }
 348         } catch (final NoSuchMethodException e) {
 349             throw new IllegalStateException("Rpc defined in model does not have representation in generated class.", e);
 350         }
 351         return ret.build();
 352     }
 353
 354     protected ImmutableBiMap<Method, RpcDefinition> getRpcMethodToSchema(final Class<? extends RpcService> key) {
 355         final Module module = getModuleBlocking(key);
 356         final ImmutableBiMap.Builder<Method, RpcDefinition> ret = ImmutableBiMap.builder();
 357         try {
 358             for (final RpcDefinition rpcDef : module.getRpcs()) {
 359                 final Method method = findRpcMethod(key, rpcDef);
 360                 ret.put(method, rpcDef);
 361             }
 362         } catch (final NoSuchMethodException e) {
 363             throw new IllegalStateException("Rpc defined in model does not have representation in generated class.", e);
 364         }
 365         return ret.build();
 366     }
 367
 368     private Module getModuleBlocking(final Class<?> modeledClass) {
 369         final QNameModule moduleName = BindingReflections.getQNameModule(modeledClass);
 370         BindingRuntimeContext localRuntimeContext = runtimeContext();
 371         Module module = localRuntimeContext == null ? null :
 372             localRuntimeContext.getSchemaContext().findModule(moduleName).orElse(null);
 373         if (module == null && futureSchema.waitForSchema(moduleName)) {
 374             localRuntimeContext = runtimeContext();
 375             checkState(localRuntimeContext != null, "BindingRuntimeContext is not available.");
 376             module = localRuntimeContext.getSchemaContext().findModule(moduleName).orElse(null);
 377         }
 378         if (module != null) {
 379             return module;
 380         }
 381
 382         LOG.debug("Schema for {} is not available; expected module name: {}; BindingRuntimeContext: {}",
 383                 modeledClass, moduleName, localRuntimeContext);
 384         throw new IllegalStateException(String.format("Schema for %s is not available; expected module name: %s; "
 385                 + "full BindingRuntimeContext available in debug log", modeledClass, moduleName));
 386     }
 387
 388     private void waitForSchema(final Collection<Class<?>> binding, final MissingSchemaException exception) {
 389         LOG.warn("Blocking thread to wait for schema convergence updates for {} {}", futureSchema.getDuration(),
 390             futureSchema.getUnit());
 391         if (!futureSchema.waitForSchema(binding)) {
 392             throw exception;
 393         }
 394     }
 395
 396     private Method findRpcMethod(final Class<? extends RpcService> key, final RpcDefinition rpcDef)
 397             throws NoSuchMethodException {
 398         final String methodName = BindingMapping.getMethodName(rpcDef.getQName());
 399         final Class<?> inputClz = runtimeContext().getClassForSchema(rpcDef.getInput());
 400         return key.getMethod(methodName, inputClz);
 401     }
 402
 403     @Override
 404     public final BindingCodecTree create(final BindingRuntimeContext context) {
 405         return codecRegistry.create(context);
 406     }
 407
 408     @Override
 409     public final BindingCodecTree create(final SchemaContext context, final Class<?>... bindingClasses) {
 410         return codecRegistry.create(context, bindingClasses);
 411     }
 412
 413     protected @NonNull Entry<InstanceIdentifier<?>, BindingDataObjectCodecTreeNode<?>> getSubtreeCodec(
 414             final YangInstanceIdentifier domIdentifier) {
 415
 416         final BindingCodecTree currentCodecTree = codecRegistry.getCodecContext();
 417         final InstanceIdentifier<?> bindingPath = codecRegistry.fromYangInstanceIdentifier(domIdentifier);
 418         checkArgument(bindingPath != null);
 419         /**
 420          * If we are able to deserialize YANG instance identifier, getSubtreeCodec must
 421          * return non-null value.
 422          */
 423         final BindingDataObjectCodecTreeNode<?> codecContext = currentCodecTree.getSubtreeCodec(bindingPath);
 424         return new SimpleEntry<>(bindingPath, codecContext);
 425     }
 426
 427     @SuppressWarnings("unchecked")
 428     public final Set<Class<? extends Notification>> getNotificationClasses(final Set<SchemaPath> interested) {
 429         final Set<Class<? extends Notification>> result = new HashSet<>();
 430         final BindingRuntimeContext runtimeContext = runtimeContext();
 431         for (final NotificationDefinition notification : runtimeContext.getSchemaContext().getNotifications()) {
 432             if (interested.contains(notification.getPath())) {
 433                 try {
 434                     result.add((Class<? extends Notification>) runtimeContext.getClassForSchema(notification));
 435                 } catch (final IllegalStateException e) {
 436                     // Ignore
 437                     LOG.warn("Class for {} is currently not known.", notification.getPath(), e);
 438                 }
 439             }
 440         }
 441         return result;
 442     }
 443
 444     SchemaPath getActionPath(final Class<? extends Action<?, ?, ?>> type) {
 445         final ActionDefinition schema = runtimeContext().getActionDefinition(type);
 446         checkArgument(schema != null, "Failed to find schema for %s", type);
 447         return schema.getPath();
 448     }
 449
 450     private BindingRuntimeContext runtimeContext() {
 451         return futureSchema.runtimeContext();
 452     }
 453
 454     private static Collection<Class<?>> decompose(final InstanceIdentifier<?> path) {
 455         return ImmutableSet.copyOf(Iterators.transform(path.getPathArguments().iterator(), PathArgument::getType));
 456     }
 457
 458     protected NormalizedNode<?, ?> instanceIdentifierToNode(final YangInstanceIdentifier parentPath) {
 459         return ImmutableNodes.fromInstanceId(runtimeContext().getSchemaContext(), parentPath);
 460     }
 461
 462     /**
 463      * This method creates an empty list container of a particular type.
 464      *
 465      * @deprecated This method is not generally useful, as empty lists do not convey information in YANG (they are
 466      *             equivalent to non-present lists). It also leaks implementation details to a broader scope and should
 467      *             never have been public in the first place.
 468      */
 469     @Deprecated
 470     public NormalizedNode<?, ?> getDefaultNodeFor(final YangInstanceIdentifier parentMapPath) {
 471         final BindingCodecTreeNode mapCodec = requireNonNull(
 472                 codecRegistry.getCodecContext().getSubtreeCodec(parentMapPath),
 473                 "Codec not found for yang instance identifier: " + parentMapPath);
 474         final WithStatus schema = mapCodec.getSchema();
 475         if (schema instanceof ListSchemaNode) {
 476             final ListSchemaNode castedSchema = (ListSchemaNode) schema;
 477             return castedSchema.isUserOrdered() ? Builders.orderedMapBuilder(castedSchema).build()
 478                     : Builders.mapBuilder(castedSchema).build();
 479         }
 480         throw new IllegalArgumentException("Path does not point to list schema node");
 481     }
 482
 483     protected Collection<DOMDataTreeIdentifier> toDOMDataTreeIdentifiers(
 484             final Collection<DataTreeIdentifier<?>> subtrees) {
 485         return subtrees.stream().map(this::toDOMDataTreeIdentifier).collect(Collectors.toSet());
 486     }
 487
 488     protected DOMDataTreeIdentifier toDOMDataTreeIdentifier(final DataTreeIdentifier<?> path) {
 489         final YangInstanceIdentifier domPath = toYangInstanceIdentifierBlocking(path.getRootIdentifier());
 490         return new DOMDataTreeIdentifier(path.getDatastoreType(), domPath);
 491     }
 492 }