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.netconf.sal.streams.listeners;
10 import com.google.common.base.Preconditions;
11 import java.io.IOException;
13 import java.util.Map.Entry;
15 import javax.xml.stream.XMLStreamException;
16 import javax.xml.transform.dom.DOMResult;
18 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
19 import org.opendaylight.controller.md.sal.dom.api.DOMDataChangeListener;
20 import org.opendaylight.netconf.sal.restconf.impl.ControllerContext;
21 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
22 import org.opendaylight.yangtools.yang.common.QName;
23 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
24 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
25 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeWithValue;
26 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgument;
27 import org.opendaylight.yangtools.yang.data.api.schema.LeafNode;
28 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
29 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
30 import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListEntryNode;
31 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
32 import org.opendaylight.yangtools.yang.model.api.Module;
33 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
34 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
35 import org.slf4j.Logger;
36 import org.slf4j.LoggerFactory;
37 import org.w3c.dom.Document;
38 import org.w3c.dom.Element;
39 import org.w3c.dom.Node;
42 * {@link ListenerAdapter} is responsible to track events, which occurred by
43 * changing data in data source.
45 public class ListenerAdapter extends AbstractCommonSubscriber implements DOMDataChangeListener {
47 private static final Logger LOG = LoggerFactory.getLogger(ListenerAdapter.class);
49 private final YangInstanceIdentifier path;
50 private final String streamName;
51 private final NotificationOutputType outputType;
53 private AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change;
56 * Creates new {@link ListenerAdapter} listener specified by path and stream
57 * name and register for subscribing.
60 * Path to data in data store.
62 * The name of the stream.
64 * Type of output on notification (JSON, XML)
66 ListenerAdapter(final YangInstanceIdentifier path, final String streamName,
67 final NotificationOutputType outputType) {
70 this.outputType = Preconditions.checkNotNull(outputType);
71 this.path = Preconditions.checkNotNull(path);
72 Preconditions.checkArgument((streamName != null) && !streamName.isEmpty());
73 this.streamName = streamName;
77 public void onDataChanged(final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change) {
79 final String xml = prepareXml();
80 if (checkQueryParams(xml, this)) {
81 prepareAndPostData(xml);
86 * Gets the name of the stream.
88 * @return The name of the stream.
91 public String getStreamName() {
92 return this.streamName;
96 public String getOutputType() {
97 return this.outputType.getName();
101 * Get path pointed to data in data store.
103 * @return Path pointed to data in data store.
105 public YangInstanceIdentifier getPath() {
110 * Prepare data of notification and data to client.
114 private void prepareAndPostData(final String xml) {
115 final Event event = new Event(EventType.NOTIFY);
116 if (this.outputType.equals(NotificationOutputType.JSON)) {
117 event.setData(XML.toJSONObject(xml).toString());
125 * Tracks events of data change by customer.
129 * Prepare data in printable form and transform it to String.
131 * @return Data in printable form.
133 private String prepareXml() {
134 final SchemaContext schemaContext = ControllerContext.getInstance().getGlobalSchema();
135 final DataSchemaContextTree dataContextTree = DataSchemaContextTree.from(schemaContext);
136 final Document doc = createDocument();
137 final Element notificationElement = basePartDoc(doc);
139 final Element dataChangedNotificationEventElement = doc.createElementNS(
140 "urn:opendaylight:params:xml:ns:yang:controller:md:sal:remote", "data-changed-notification");
142 addValuesToDataChangedNotificationEventElement(doc, dataChangedNotificationEventElement, this.change,
143 schemaContext, dataContextTree);
144 notificationElement.appendChild(dataChangedNotificationEventElement);
145 return transformDoc(doc);
149 * Adds values to data changed notification event element.
153 * @param dataChangedNotificationEventElement
156 * {@link AsyncDataChangeEvent}
158 private void addValuesToDataChangedNotificationEventElement(final Document doc,
159 final Element dataChangedNotificationEventElement,
160 final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change,
161 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
163 addCreatedChangedValuesFromDataToElement(doc, change.getCreatedData().entrySet(),
164 dataChangedNotificationEventElement, Operation.CREATED, schemaContext, dataSchemaContextTree);
166 addCreatedChangedValuesFromDataToElement(doc, change.getUpdatedData().entrySet(),
167 dataChangedNotificationEventElement, Operation.UPDATED, schemaContext, dataSchemaContextTree);
169 addValuesFromDataToElement(doc, change.getRemovedPaths(), dataChangedNotificationEventElement,
174 * Adds values from data to element.
179 * Set of {@link YangInstanceIdentifier}.
185 private void addValuesFromDataToElement(final Document doc, final Set<YangInstanceIdentifier> data,
186 final Element element, final Operation operation) {
187 if ((data == null) || data.isEmpty()) {
190 for (final YangInstanceIdentifier path : data) {
191 if (!ControllerContext.getInstance().isNodeMixin(path)) {
192 final Node node = createDataChangeEventElement(doc, path, operation);
193 element.appendChild(node);
198 private void addCreatedChangedValuesFromDataToElement(final Document doc,
199 final Set<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> data, final Element element,
200 final Operation operation, final SchemaContext schemaContext,
201 final DataSchemaContextTree dataSchemaContextTree) {
202 if ((data == null) || data.isEmpty()) {
205 for (final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry : data) {
206 if (!ControllerContext.getInstance().isNodeMixin(entry.getKey())
207 && (!getLeafNodesOnly() || entry.getValue() instanceof LeafNode)) {
208 final Node node = createCreatedChangedDataChangeEventElement(doc, entry, operation, schemaContext,
209 dataSchemaContextTree);
210 element.appendChild(node);
216 * Creates changed event element from data.
221 * Path to data in data store.
224 * @return {@link Node} node represented by changed event element.
226 private Node createDataChangeEventElement(final Document doc, final YangInstanceIdentifier path,
227 final Operation operation) {
228 final Element dataChangeEventElement = doc.createElement("data-change-event");
229 final Element pathElement = doc.createElement("path");
230 addPathAsValueToElement(path, pathElement);
231 dataChangeEventElement.appendChild(pathElement);
233 final Element operationElement = doc.createElement("operation");
234 operationElement.setTextContent(operation.value);
235 dataChangeEventElement.appendChild(operationElement);
237 return dataChangeEventElement;
240 private Node createCreatedChangedDataChangeEventElement(final Document doc,
241 final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry, final Operation operation,
242 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
243 final Element dataChangeEventElement = doc.createElement("data-change-event");
244 final Element pathElement = doc.createElement("path");
245 final YangInstanceIdentifier path = entry.getKey();
246 addPathAsValueToElement(path, pathElement);
247 dataChangeEventElement.appendChild(pathElement);
249 final Element operationElement = doc.createElement("operation");
250 operationElement.setTextContent(operation.value);
251 dataChangeEventElement.appendChild(operationElement);
255 final NormalizedNode<?, ?> normalized = entry.getValue();
256 if ((normalized instanceof MapEntryNode) || (normalized instanceof UnkeyedListEntryNode)) {
257 nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath();
259 nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath().getParent();
261 final DOMResult domResult = writeNormalizedNode(normalized, schemaContext, nodePath);
262 final Node result = doc.importNode(domResult.getNode().getFirstChild(), true);
263 final Element dataElement = doc.createElement("data");
264 dataElement.appendChild(result);
265 dataChangeEventElement.appendChild(dataElement);
266 } catch (final IOException e) {
267 LOG.error("Error in writer ", e);
268 } catch (final XMLStreamException e) {
269 LOG.error("Error processing stream", e);
272 return dataChangeEventElement;
276 * Adds path as value to element.
279 * Path to data in data store.
283 @SuppressWarnings("rawtypes")
284 private void addPathAsValueToElement(final YangInstanceIdentifier path, final Element element) {
285 final YangInstanceIdentifier normalizedPath = ControllerContext.getInstance().toXpathRepresentation(path);
286 final StringBuilder textContent = new StringBuilder();
288 for (final PathArgument pathArgument : normalizedPath.getPathArguments()) {
289 if (pathArgument instanceof YangInstanceIdentifier.AugmentationIdentifier) {
292 textContent.append("/");
293 writeIdentifierWithNamespacePrefix(element, textContent, pathArgument.getNodeType());
294 if (pathArgument instanceof NodeIdentifierWithPredicates) {
295 final Map<QName, Object> predicates = ((NodeIdentifierWithPredicates) pathArgument).getKeyValues();
296 for (final QName keyValue : predicates.keySet()) {
297 final String predicateValue = String.valueOf(predicates.get(keyValue));
298 textContent.append("[");
299 writeIdentifierWithNamespacePrefix(element, textContent, keyValue);
300 textContent.append("='");
301 textContent.append(predicateValue);
302 textContent.append("'");
303 textContent.append("]");
305 } else if (pathArgument instanceof NodeWithValue) {
306 textContent.append("[.='");
307 textContent.append(((NodeWithValue) pathArgument).getValue());
308 textContent.append("'");
309 textContent.append("]");
312 element.setTextContent(textContent.toString());
316 * Writes identifier that consists of prefix and QName.
322 * @param qualifiedName
325 private static void writeIdentifierWithNamespacePrefix(final Element element, final StringBuilder textContent,
326 final QName qualifiedName) {
327 final Module module = ControllerContext.getInstance().getGlobalSchema()
328 .findModuleByNamespaceAndRevision(qualifiedName.getNamespace(), qualifiedName.getRevision());
330 textContent.append(module.getName());
331 textContent.append(":");
332 textContent.append(qualifiedName.getLocalName());
336 * Consists of three types {@link Operation#CREATED},
337 * {@link Operation#UPDATED} and {@link Operation#DELETED}.
339 private enum Operation {
340 CREATED("created"), UPDATED("updated"), DELETED("deleted");
342 private final String value;
344 Operation(final String value) {