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 public void onDataChanged(final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change) {
81 final String xml = prepareXml();
82 if (checkQueryParams(xml, this)) {
83 prepareAndPostData(xml);
88 * Gets the name of the stream.
90 * @return The name of the stream.
93 public String getStreamName() {
94 return this.streamName;
98 public String getOutputType() {
99 return this.outputType.getName();
103 * Get path pointed to data in data store.
105 * @return Path pointed to data in data store.
107 public YangInstanceIdentifier getPath() {
112 * Prepare data of notification and data to client.
116 private void prepareAndPostData(final String xml) {
117 final Event event = new Event(EventType.NOTIFY);
118 if (this.outputType.equals(NotificationOutputType.JSON)) {
120 final JsonNode node = new XmlMapper().readTree(xml.getBytes());
121 event.setData(node.toString());
122 } catch (final IOException e) {
123 LOG.error("Error parsing XML {}", xml, e);
124 Throwables.propagate(e);
133 * Tracks events of data change by customer.
137 * Prepare data in printable form and transform it to String.
139 * @return Data in printable form.
141 private String prepareXml() {
142 final SchemaContext schemaContext = schemaHandler.get();
143 final DataSchemaContextTree dataContextTree = DataSchemaContextTree.from(schemaContext);
144 final Document doc = createDocument();
145 final Element notificationElement = basePartDoc(doc);
147 final Element dataChangedNotificationEventElement = doc.createElementNS(
148 "urn:opendaylight:params:xml:ns:yang:controller:md:sal:remote", "data-changed-notification");
150 addValuesToDataChangedNotificationEventElement(doc, dataChangedNotificationEventElement, this.change,
151 schemaContext, dataContextTree);
152 notificationElement.appendChild(dataChangedNotificationEventElement);
153 return transformDoc(doc);
157 * Adds values to data changed notification event element.
161 * @param dataChangedNotificationEventElement
164 * {@link AsyncDataChangeEvent}
166 private void addValuesToDataChangedNotificationEventElement(final Document doc,
167 final Element dataChangedNotificationEventElement,
168 final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change,
169 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
171 addCreatedChangedValuesFromDataToElement(doc, change.getCreatedData().entrySet(),
172 dataChangedNotificationEventElement, Operation.CREATED, schemaContext, dataSchemaContextTree);
174 addCreatedChangedValuesFromDataToElement(doc, change.getUpdatedData().entrySet(),
175 dataChangedNotificationEventElement, Operation.UPDATED, schemaContext, dataSchemaContextTree);
177 addValuesFromDataToElement(doc, change.getRemovedPaths(), dataChangedNotificationEventElement,
178 Operation.DELETED, schemaContext, dataSchemaContextTree);
182 * Adds values from data to element.
187 * Set of {@link YangInstanceIdentifier}.
192 * @param schemaContext
194 * @param dataSchemaContextTree
195 * data schema context tree
197 private void addValuesFromDataToElement(final Document doc, final Set<YangInstanceIdentifier> data,
198 final Element element, final Operation operation, final SchemaContext schemaContext,
199 final DataSchemaContextTree dataSchemaContextTree) {
200 if ((data == null) || data.isEmpty()) {
203 for (final YangInstanceIdentifier path : data) {
204 if (!dataSchemaContextTree.getChild(path).isMixin()) {
205 final Node node = createDataChangeEventElement(doc, path, operation, schemaContext);
206 element.appendChild(node);
211 private void addCreatedChangedValuesFromDataToElement(final Document doc,
212 final Set<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> data, final Element element,
213 final Operation operation, final SchemaContext schemaContext,
214 final DataSchemaContextTree dataSchemaContextTree) {
215 if ((data == null) || data.isEmpty()) {
218 for (final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry : data) {
219 if (!dataSchemaContextTree.getChild(entry.getKey()).isMixin()
220 && (!getLeafNodesOnly() || entry.getValue() instanceof LeafNode)) {
221 final Node node = createCreatedChangedDataChangeEventElement(doc, entry, operation, schemaContext,
222 dataSchemaContextTree);
223 element.appendChild(node);
229 * Creates changed event element from data.
234 * Path to data in data store.
237 * @param schemaContext
239 * @return {@link Node} node represented by changed event element.
241 private Node createDataChangeEventElement(final Document doc, final YangInstanceIdentifier path,
242 final Operation operation, final SchemaContext schemaContext) {
243 final Element dataChangeEventElement = doc.createElement("data-change-event");
244 final Element pathElement = doc.createElement("path");
245 addPathAsValueToElement(path, pathElement, schemaContext);
246 dataChangeEventElement.appendChild(pathElement);
248 final Element operationElement = doc.createElement("operation");
249 operationElement.setTextContent(operation.value);
250 dataChangeEventElement.appendChild(operationElement);
252 return dataChangeEventElement;
255 private Node createCreatedChangedDataChangeEventElement(final Document doc,
256 final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry, final Operation operation,
257 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
258 final Element dataChangeEventElement = doc.createElement("data-change-event");
259 final Element pathElement = doc.createElement("path");
260 final YangInstanceIdentifier path = entry.getKey();
261 addPathAsValueToElement(path, pathElement, schemaContext);
262 dataChangeEventElement.appendChild(pathElement);
264 final Element operationElement = doc.createElement("operation");
265 operationElement.setTextContent(operation.value);
266 dataChangeEventElement.appendChild(operationElement);
270 final NormalizedNode<?, ?> normalized = entry.getValue();
271 if ((normalized instanceof MapEntryNode) || (normalized instanceof UnkeyedListEntryNode)) {
272 nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath();
274 nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath().getParent();
276 final DOMResult domResult = writeNormalizedNode(normalized, schemaContext, nodePath);
277 final Node result = doc.importNode(domResult.getNode().getFirstChild(), true);
278 final Element dataElement = doc.createElement("data");
279 dataElement.appendChild(result);
280 dataChangeEventElement.appendChild(dataElement);
281 } catch (final IOException e) {
282 LOG.error("Error in writer ", e);
283 } catch (final XMLStreamException e) {
284 LOG.error("Error processing stream", e);
287 return dataChangeEventElement;
291 * Adds path as value to element.
294 * Path to data in data store.
297 * @param schemaContext
300 @SuppressWarnings("rawtypes")
301 private void addPathAsValueToElement(final YangInstanceIdentifier path, final Element element,
302 final SchemaContext schemaContext) {
303 final StringBuilder textContent = new StringBuilder();
305 for (final PathArgument pathArgument : path.getPathArguments()) {
306 if (pathArgument instanceof YangInstanceIdentifier.AugmentationIdentifier) {
309 textContent.append("/");
310 writeIdentifierWithNamespacePrefix(element, textContent, pathArgument.getNodeType(), schemaContext);
311 if (pathArgument instanceof NodeIdentifierWithPredicates) {
312 final Map<QName, Object> predicates = ((NodeIdentifierWithPredicates) pathArgument).getKeyValues();
313 for (final QName keyValue : predicates.keySet()) {
314 final String predicateValue = String.valueOf(predicates.get(keyValue));
315 textContent.append("[");
316 writeIdentifierWithNamespacePrefix(element, textContent, keyValue, schemaContext);
317 textContent.append("='");
318 textContent.append(predicateValue);
319 textContent.append("'");
320 textContent.append("]");
322 } else if (pathArgument instanceof NodeWithValue) {
323 textContent.append("[.='");
324 textContent.append(((NodeWithValue) pathArgument).getValue());
325 textContent.append("'");
326 textContent.append("]");
329 element.setTextContent(textContent.toString());
333 * Writes identifier that consists of prefix and QName.
339 * @param qualifiedName
341 * @param schemaContext
344 private static void writeIdentifierWithNamespacePrefix(final Element element, final StringBuilder textContent,
345 final QName qualifiedName, final SchemaContext schemaContext) {
346 final Module module = schemaContext.findModuleByNamespaceAndRevision(qualifiedName.getNamespace(),
347 qualifiedName.getRevision());
349 textContent.append(module.getName());
350 textContent.append(":");
351 textContent.append(qualifiedName.getLocalName());
355 * Consists of three types {@link Operation#CREATED},
356 * {@link Operation#UPDATED} and {@link Operation#DELETED}.
358 private enum Operation {
359 CREATED("created"), UPDATED("updated"), DELETED("deleted");
361 private final String value;
363 Operation(final String value) {