2 * Copyright (c) 2014, 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.restconf.nb.rfc8040.streams.listeners;
10 import com.fasterxml.jackson.databind.JsonNode;
11 import com.fasterxml.jackson.dataformat.xml.XmlMapper;
12 import com.google.common.base.Preconditions;
13 import com.google.common.base.Throwables;
14 import java.io.IOException;
16 import java.util.Map.Entry;
18 import javax.xml.stream.XMLStreamException;
19 import javax.xml.transform.dom.DOMResult;
20 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
21 import org.opendaylight.controller.md.sal.dom.api.DOMDataChangeListener;
22 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
23 import org.opendaylight.yangtools.yang.common.QName;
24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
27 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
28 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
29 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
30 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
31 import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListEntryNode;
32 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
33 import org.opendaylight.yangtools.yang.model.api.Module;
34 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
35 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
36 import org.slf4j.Logger;
37 import org.slf4j.LoggerFactory;
38 import org.w3c.dom.Document;
39 import org.w3c.dom.Element;
40 import org.w3c.dom.Node;
43 * {@link ListenerAdapter} is responsible to track events, which occurred by
44 * changing data in data source.
46 public class ListenerAdapter extends AbstractCommonSubscriber implements DOMDataChangeListener {
48 private static final Logger LOG = LoggerFactory.getLogger(ListenerAdapter.class);
50 private final YangInstanceIdentifier path;
51 private final String streamName;
52 private final NotificationOutputType outputType;
54 private AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change;
57 * Creates new {@link ListenerAdapter} listener specified by path and stream
58 * name and register for subscribing.
61 * Path to data in data store.
63 * The name of the stream.
65 * Type of output on notification (JSON, XML)
67 ListenerAdapter(final YangInstanceIdentifier path, final String streamName,
68 final NotificationOutputType outputType) {
70 setLocalNameOfPath(path.getLastPathArgument().getNodeType().getLocalName());
72 this.outputType = Preconditions.checkNotNull(outputType);
73 this.path = Preconditions.checkNotNull(path);
74 Preconditions.checkArgument(streamName != null && !streamName.isEmpty());
75 this.streamName = streamName;
79 @SuppressWarnings("checkstyle:hiddenField")
80 public void onDataChanged(final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change) {
82 final String xml = prepareXml();
83 if (checkQueryParams(xml, this)) {
84 prepareAndPostData(xml);
89 * Gets the name of the stream.
91 * @return The name of the stream.
94 public String getStreamName() {
95 return this.streamName;
99 public String getOutputType() {
100 return this.outputType.getName();
104 * Get path pointed to data in data store.
106 * @return Path pointed to data in data store.
108 public YangInstanceIdentifier getPath() {
113 * Prepare data of notification and data to client.
117 private void prepareAndPostData(final String xml) {
118 final Event event = new Event(EventType.NOTIFY);
119 if (this.outputType.equals(NotificationOutputType.JSON)) {
121 final JsonNode node = new XmlMapper().readTree(xml.getBytes());
122 event.setData(node.toString());
123 } catch (final IOException e) {
124 LOG.error("Error parsing XML {}", xml, e);
125 Throwables.propagate(e);
134 * Tracks events of data change by customer.
138 * Prepare data in printable form and transform it to String.
140 * @return Data in printable form.
142 private String prepareXml() {
143 final SchemaContext schemaContext = schemaHandler.get();
144 final DataSchemaContextTree dataContextTree = DataSchemaContextTree.from(schemaContext);
145 final Document doc = createDocument();
146 final Element notificationElement = basePartDoc(doc);
148 final Element dataChangedNotificationEventElement = doc.createElementNS(
149 "urn:opendaylight:params:xml:ns:yang:controller:md:sal:remote", "data-changed-notification");
151 addValuesToDataChangedNotificationEventElement(doc, dataChangedNotificationEventElement, this.change,
152 schemaContext, dataContextTree);
153 notificationElement.appendChild(dataChangedNotificationEventElement);
154 return transformDoc(doc);
158 * Adds values to data changed notification event element.
162 * @param dataChangedNotificationEventElement
165 * {@link AsyncDataChangeEvent}
167 @SuppressWarnings("checkstyle:hiddenField")
168 private void addValuesToDataChangedNotificationEventElement(final Document doc,
169 final Element dataChangedNotificationEventElement,
170 final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change,
171 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
173 addCreatedChangedValuesFromDataToElement(doc, change.getCreatedData().entrySet(),
174 dataChangedNotificationEventElement, Operation.CREATED, schemaContext, dataSchemaContextTree);
176 addCreatedChangedValuesFromDataToElement(doc, change.getUpdatedData().entrySet(),
177 dataChangedNotificationEventElement, Operation.UPDATED, schemaContext, dataSchemaContextTree);
179 addValuesFromDataToElement(doc, change.getRemovedPaths(), dataChangedNotificationEventElement,
180 Operation.DELETED, schemaContext, dataSchemaContextTree);
184 * Adds values from data to element.
189 * Set of {@link YangInstanceIdentifier}.
194 * @param schemaContext
196 * @param dataSchemaContextTree
197 * data schema context tree
199 private void addValuesFromDataToElement(final Document doc, final Set<YangInstanceIdentifier> data,
200 final Element element, final Operation operation, final SchemaContext schemaContext,
201 final DataSchemaContextTree dataSchemaContextTree) {
202 if (data == null || data.isEmpty()) {
205 for (final YangInstanceIdentifier yiid : data) {
206 if (!dataSchemaContextTree.getChild(yiid).isMixin()) {
207 final Node node = createDataChangeEventElement(doc, yiid, operation, schemaContext);
208 element.appendChild(node);
213 private void addCreatedChangedValuesFromDataToElement(final Document doc,
214 final Set<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> data, final Element element,
215 final Operation operation, final SchemaContext schemaContext,
216 final DataSchemaContextTree dataSchemaContextTree) {
217 if (data == null || data.isEmpty()) {
220 for (final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry : data) {
221 if (!dataSchemaContextTree.getChild(entry.getKey()).isMixin()
222 && (!getLeafNodesOnly() || entry.getValue() instanceof LeafNode)) {
223 final Node node = createCreatedChangedDataChangeEventElement(doc, entry, operation, schemaContext,
224 dataSchemaContextTree);
225 element.appendChild(node);
231 * Creates changed event element from data.
236 * Path to data in data store.
239 * @param schemaContext
241 * @return {@link Node} node represented by changed event element.
243 private Node createDataChangeEventElement(final Document doc, final YangInstanceIdentifier eventPath,
244 final Operation operation, final SchemaContext schemaContext) {
245 final Element dataChangeEventElement = doc.createElement("data-change-event");
246 final Element pathElement = doc.createElement("path");
247 addPathAsValueToElement(eventPath, pathElement, schemaContext);
248 dataChangeEventElement.appendChild(pathElement);
250 final Element operationElement = doc.createElement("operation");
251 operationElement.setTextContent(operation.value);
252 dataChangeEventElement.appendChild(operationElement);
254 return dataChangeEventElement;
257 private Node createCreatedChangedDataChangeEventElement(final Document doc,
258 final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry, final Operation operation,
259 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
260 final Element dataChangeEventElement = doc.createElement("data-change-event");
261 final Element pathElement = doc.createElement("path");
262 final YangInstanceIdentifier eventPath = entry.getKey();
263 addPathAsValueToElement(eventPath, pathElement, schemaContext);
264 dataChangeEventElement.appendChild(pathElement);
266 final Element operationElement = doc.createElement("operation");
267 operationElement.setTextContent(operation.value);
268 dataChangeEventElement.appendChild(operationElement);
272 final NormalizedNode<?, ?> normalized = entry.getValue();
273 if (normalized instanceof MapEntryNode || normalized instanceof UnkeyedListEntryNode) {
274 nodePath = dataSchemaContextTree.getChild(eventPath).getDataSchemaNode().getPath();
276 nodePath = dataSchemaContextTree.getChild(eventPath).getDataSchemaNode().getPath().getParent();
278 final DOMResult domResult = writeNormalizedNode(normalized, schemaContext, nodePath);
279 final Node result = doc.importNode(domResult.getNode().getFirstChild(), true);
280 final Element dataElement = doc.createElement("data");
281 dataElement.appendChild(result);
282 dataChangeEventElement.appendChild(dataElement);
283 } catch (final IOException e) {
284 LOG.error("Error in writer ", e);
285 } catch (final XMLStreamException e) {
286 LOG.error("Error processing stream", e);
289 return dataChangeEventElement;
293 * Adds path as value to element.
296 * Path to data in data store.
299 * @param schemaContext
302 @SuppressWarnings("rawtypes")
303 private void addPathAsValueToElement(final YangInstanceIdentifier eventPath, final Element element,
304 final SchemaContext schemaContext) {
305 final StringBuilder textContent = new StringBuilder();
307 for (final PathArgument pathArgument : eventPath.getPathArguments()) {
308 if (pathArgument instanceof YangInstanceIdentifier.AugmentationIdentifier) {
311 textContent.append("/");
312 writeIdentifierWithNamespacePrefix(element, textContent, pathArgument.getNodeType(), schemaContext);
313 if (pathArgument instanceof NodeIdentifierWithPredicates) {
314 final Map<QName, Object> predicates = ((NodeIdentifierWithPredicates) pathArgument).getKeyValues();
315 for (final QName keyValue : predicates.keySet()) {
316 final String predicateValue = String.valueOf(predicates.get(keyValue));
317 textContent.append("[");
318 writeIdentifierWithNamespacePrefix(element, textContent, keyValue, schemaContext);
319 textContent.append("='");
320 textContent.append(predicateValue);
321 textContent.append("'");
322 textContent.append("]");
324 } else if (pathArgument instanceof NodeWithValue) {
325 textContent.append("[.='");
326 textContent.append(((NodeWithValue) pathArgument).getValue());
327 textContent.append("'");
328 textContent.append("]");
331 element.setTextContent(textContent.toString());
335 * Writes identifier that consists of prefix and QName.
341 * @param qualifiedName
343 * @param schemaContext
346 private static void writeIdentifierWithNamespacePrefix(final Element element, final StringBuilder textContent,
347 final QName qualifiedName, final SchemaContext schemaContext) {
348 final Module module = schemaContext.findModule(qualifiedName.getModule()).get();
350 textContent.append(module.getName());
351 textContent.append(":");
352 textContent.append(qualifiedName.getLocalName());
356 * Consists of three types {@link Operation#CREATED},
357 * {@link Operation#UPDATED} and {@link Operation#DELETED}.
359 private enum Operation {
360 CREATED("created"), UPDATED("updated"), DELETED("deleted");
362 private final String value;
364 Operation(final String value) {