2 * Copyright (c) 2016 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.mdsal.dom.store.inmemory;
10 import static com.google.common.base.Preconditions.checkState;
11 import static java.util.Objects.requireNonNull;
13 import java.util.ArrayList;
14 import java.util.Collection;
15 import java.util.Collections;
16 import java.util.HashMap;
17 import java.util.Iterator;
18 import java.util.List;
20 import java.util.Optional;
21 import java.util.stream.Collectors;
22 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
23 import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
24 import org.opendaylight.mdsal.dom.spi.AbstractDOMDataTreeChangeListenerRegistration;
25 import org.opendaylight.mdsal.dom.spi.RegistrationTreeNode;
26 import org.opendaylight.mdsal.dom.spi.shard.ChildShardContext;
27 import org.opendaylight.mdsal.dom.spi.store.AbstractDOMStoreTreeChangePublisher;
28 import org.opendaylight.mdsal.dom.spi.store.DOMStoreTreeChangePublisher;
29 import org.opendaylight.yangtools.concepts.ListenerRegistration;
30 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
31 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
32 import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
33 import org.opendaylight.yangtools.yang.data.api.schema.DataContainerNode;
34 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
35 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
36 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTree;
37 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
38 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNode;
39 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidateNodes;
40 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidates;
41 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeModification;
42 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataValidationFailedException;
43 import org.opendaylight.yangtools.yang.data.impl.schema.builder.api.NormalizedNodeBuilder;
44 import org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableContainerNodeBuilder;
45 import org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableMapEntryNodeBuilder;
46 import org.slf4j.Logger;
47 import org.slf4j.LoggerFactory;
49 abstract class AbstractDOMShardTreeChangePublisher extends AbstractDOMStoreTreeChangePublisher {
51 private static final Logger LOG = LoggerFactory.getLogger(AbstractDOMShardTreeChangePublisher.class);
53 private final YangInstanceIdentifier shardPath;
54 private final Map<DOMDataTreeIdentifier, ChildShardContext> childShards;
55 private final DataTree dataTree;
57 protected AbstractDOMShardTreeChangePublisher(final DataTree dataTree,
58 final YangInstanceIdentifier shardPath, final Map<DOMDataTreeIdentifier, ChildShardContext> childShards) {
59 this.dataTree = requireNonNull(dataTree);
60 this.shardPath = requireNonNull(shardPath);
61 this.childShards = requireNonNull(childShards);
65 public <L extends DOMDataTreeChangeListener> AbstractDOMDataTreeChangeListenerRegistration<L>
66 registerTreeChangeListener(final YangInstanceIdentifier path, final L listener) {
69 return setupListenerContext(path, listener);
75 private <L extends DOMDataTreeChangeListener> AbstractDOMDataTreeChangeListenerRegistration<L>
76 setupListenerContext(final YangInstanceIdentifier listenerPath, final L listener) {
77 // we need to register the listener registration path based on the shards root
78 // we have to strip the shard path from the listener path and then register
79 YangInstanceIdentifier strippedIdentifier = listenerPath;
80 if (!shardPath.isEmpty()) {
81 strippedIdentifier = YangInstanceIdentifier.create(stripShardPath(listenerPath));
84 final DOMDataTreeListenerWithSubshards subshardListener =
85 new DOMDataTreeListenerWithSubshards(dataTree, strippedIdentifier, listener);
86 final AbstractDOMDataTreeChangeListenerRegistration<L> reg =
87 setupContextWithoutSubshards(strippedIdentifier, subshardListener);
89 for (final ChildShardContext maybeAffected : childShards.values()) {
90 if (listenerPath.contains(maybeAffected.getPrefix().getRootIdentifier())) {
91 // consumer has initialDataChangeEvent subshard somewhere on lower level
92 // register to the notification manager with snapshot and forward child notifications to parent
93 LOG.debug("Adding new subshard{{}} to listener at {}", maybeAffected.getPrefix(), listenerPath);
94 subshardListener.addSubshard(maybeAffected);
95 } else if (maybeAffected.getPrefix().getRootIdentifier().contains(listenerPath)) {
96 // bind path is inside subshard
97 // TODO can this happen? seems like in ShardedDOMDataTree we are
98 // already registering to the lowest shard possible
99 throw new UnsupportedOperationException("Listener should be registered directly "
100 + "into initialDataChangeEvent subshard");
104 initialDataChangeEvent(listenerPath, listener);
109 private <L extends DOMDataTreeChangeListener> void initialDataChangeEvent(
110 final YangInstanceIdentifier listenerPath, final L listener) {
111 // FIXME Add support for wildcard listeners
112 final Optional<NormalizedNode<?, ?>> preExistingData = dataTree.takeSnapshot()
113 .readNode(YangInstanceIdentifier.create(stripShardPath(listenerPath)));
114 final DataTreeCandidate initialCandidate;
116 if (preExistingData.isPresent()) {
117 final NormalizedNode<?, ?> data = preExistingData.get();
118 checkState(data instanceof DataContainerNode, "Expected DataContainer node, but was {}", data.getClass());
119 // if we are listening on root of some shard we still get
120 // empty normalized node, root is always present
121 if (((DataContainerNode<?>) data).getValue().isEmpty()) {
122 initialCandidate = DataTreeCandidates.newDataTreeCandidate(listenerPath,
123 DataTreeCandidateNodes.empty(data.getIdentifier()));
125 initialCandidate = DataTreeCandidates.fromNormalizedNode(listenerPath,
126 translateRootShardIdentifierToListenerPath(listenerPath, preExistingData.get()));
129 initialCandidate = DataTreeCandidates.newDataTreeCandidate(listenerPath,
130 DataTreeCandidateNodes.empty(listenerPath.getLastPathArgument()));
133 listener.onDataTreeChanged(Collections.singleton(initialCandidate));
136 private static NormalizedNode<?, ?> translateRootShardIdentifierToListenerPath(
137 final YangInstanceIdentifier listenerPath, final NormalizedNode<?, ?> node) {
138 if (listenerPath.isEmpty()) {
142 final NormalizedNodeBuilder nodeBuilder;
143 if (node instanceof ContainerNode) {
144 nodeBuilder = ImmutableContainerNodeBuilder.create().withValue(((ContainerNode) node).getValue());
145 } else if (node instanceof MapEntryNode) {
146 nodeBuilder = ImmutableMapEntryNodeBuilder.create().withValue(((MapEntryNode) node).getValue());
148 throw new IllegalArgumentException("Expected ContainerNode or MapEntryNode, but was " + node.getClass());
150 nodeBuilder.withNodeIdentifier(listenerPath.getLastPathArgument());
151 return nodeBuilder.build();
154 private <L extends DOMDataTreeChangeListener> AbstractDOMDataTreeChangeListenerRegistration<L>
155 setupContextWithoutSubshards(final YangInstanceIdentifier listenerPath,
156 final DOMDataTreeListenerWithSubshards listener) {
157 LOG.debug("Registering root listener at {}", listenerPath);
158 final RegistrationTreeNode<AbstractDOMDataTreeChangeListenerRegistration<?>> node =
159 findNodeFor(listenerPath.getPathArguments());
160 @SuppressWarnings("unchecked")
161 final AbstractDOMDataTreeChangeListenerRegistration<L> registration =
162 new AbstractDOMDataTreeChangeListenerRegistration<L>((L) listener) {
164 protected void removeRegistration() {
166 AbstractDOMShardTreeChangePublisher.this.removeRegistration(node, this);
167 registrationRemoved(this);
170 addRegistration(node, registration);
174 private Iterable<PathArgument> stripShardPath(final YangInstanceIdentifier listenerPath) {
175 if (shardPath.isEmpty()) {
176 return listenerPath.getPathArguments();
179 final List<PathArgument> listenerPathArgs = new ArrayList<>(listenerPath.getPathArguments());
180 final Iterator<PathArgument> shardIter = shardPath.getPathArguments().iterator();
181 final Iterator<PathArgument> listenerIter = listenerPathArgs.iterator();
183 while (shardIter.hasNext()) {
184 if (shardIter.next().equals(listenerIter.next())) {
185 listenerIter.remove();
191 return listenerPathArgs;
194 private static final class DOMDataTreeListenerWithSubshards implements DOMDataTreeChangeListener {
196 private final DataTree dataTree;
197 private final YangInstanceIdentifier listenerPath;
198 private final DOMDataTreeChangeListener delegate;
200 private final Map<YangInstanceIdentifier, ListenerRegistration<DOMDataTreeChangeListener>> registrations =
203 DOMDataTreeListenerWithSubshards(final DataTree dataTree, final YangInstanceIdentifier listenerPath,
204 final DOMDataTreeChangeListener delegate) {
205 this.dataTree = requireNonNull(dataTree);
206 this.listenerPath = requireNonNull(listenerPath);
207 this.delegate = requireNonNull(delegate);
211 public void onDataTreeChanged(final Collection<DataTreeCandidate> changes) {
212 LOG.debug("Received data changed {}", changes);
213 delegate.onDataTreeChanged(changes);
216 void onDataTreeChanged(final YangInstanceIdentifier rootPath, final Collection<DataTreeCandidate> changes) {
217 final List<DataTreeCandidate> newCandidates = changes.stream()
218 .map(candidate -> DataTreeCandidates.newDataTreeCandidate(rootPath, candidate.getRootNode()))
219 .collect(Collectors.toList());
220 delegate.onDataTreeChanged(Collections.singleton(applyChanges(newCandidates)));
223 void addSubshard(final ChildShardContext context) {
224 checkState(context.getShard() instanceof DOMStoreTreeChangePublisher,
225 "All subshards that are initialDataChangeEvent part of ListenerContext need to be listenable");
227 final DOMStoreTreeChangePublisher listenableShard = (DOMStoreTreeChangePublisher) context.getShard();
228 // since this is going into subshard we want to listen for ALL changes in the subshard
229 registrations.put(context.getPrefix().getRootIdentifier(),
230 listenableShard.registerTreeChangeListener(
231 context.getPrefix().getRootIdentifier(), changes -> onDataTreeChanged(
232 context.getPrefix().getRootIdentifier(), changes)));
236 for (final ListenerRegistration<DOMDataTreeChangeListener> registration : registrations.values()) {
237 registration.close();
239 registrations.clear();
242 private DataTreeCandidate applyChanges(final Collection<DataTreeCandidate> changes) {
243 final DataTreeModification modification = dataTree.takeSnapshot().newModification();
244 for (final DataTreeCandidate change : changes) {
245 DataTreeCandidates.applyToModification(modification, change);
248 modification.ready();
250 dataTree.validate(modification);
251 } catch (final DataValidationFailedException e) {
252 LOG.error("Validation failed for built modification", e);
253 throw new IllegalStateException("Notification validation failed", e);
256 // strip nodes we do not need since this listener doesn't have to be registered at the root of the DataTree
257 DataTreeCandidateNode modifiedChild = dataTree.prepare(modification).getRootNode();
258 for (final PathArgument pathArgument : listenerPath.getPathArguments()) {
259 modifiedChild = modifiedChild.getModifiedChild(pathArgument);
262 if (modifiedChild == null) {
263 modifiedChild = DataTreeCandidateNodes.empty(listenerPath.getLastPathArgument());
266 return DataTreeCandidates.newDataTreeCandidate(listenerPath, modifiedChild);