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 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)) {
119 event.setData(XML.toJSONObject(xml).toString());
127 * Tracks events of data change by customer.
131 * Prepare data in printable form and transform it to String.
133 * @return Data in printable form.
135 private String prepareXml() {
136 final SchemaContext schemaContext = ControllerContext.getInstance().getGlobalSchema();
137 final DataSchemaContextTree dataContextTree = DataSchemaContextTree.from(schemaContext);
138 final Document doc = createDocument();
139 final Element notificationElement = basePartDoc(doc);
141 final Element dataChangedNotificationEventElement = doc.createElementNS(
142 "urn:opendaylight:params:xml:ns:yang:controller:md:sal:remote", "data-changed-notification");
144 addValuesToDataChangedNotificationEventElement(doc, dataChangedNotificationEventElement, this.change,
145 schemaContext, dataContextTree);
146 notificationElement.appendChild(dataChangedNotificationEventElement);
147 return transformDoc(doc);
151 * Adds values to data changed notification event element.
155 * @param dataChangedNotificationEventElement
158 * {@link AsyncDataChangeEvent}
160 private void addValuesToDataChangedNotificationEventElement(final Document doc,
161 final Element dataChangedNotificationEventElement,
162 final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change,
163 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
165 addCreatedChangedValuesFromDataToElement(doc, change.getCreatedData().entrySet(),
166 dataChangedNotificationEventElement, Operation.CREATED, schemaContext, dataSchemaContextTree);
168 addCreatedChangedValuesFromDataToElement(doc, change.getUpdatedData().entrySet(),
169 dataChangedNotificationEventElement, Operation.UPDATED, schemaContext, dataSchemaContextTree);
171 addValuesFromDataToElement(doc, change.getRemovedPaths(), dataChangedNotificationEventElement,
176 * Adds values from data to element.
181 * Set of {@link YangInstanceIdentifier}.
187 private void addValuesFromDataToElement(final Document doc, final Set<YangInstanceIdentifier> data,
188 final Element element, final Operation operation) {
189 if ((data == null) || data.isEmpty()) {
192 for (final YangInstanceIdentifier path : data) {
193 if (!ControllerContext.getInstance().isNodeMixin(path)) {
194 final Node node = createDataChangeEventElement(doc, path, operation);
195 element.appendChild(node);
200 private void addCreatedChangedValuesFromDataToElement(final Document doc,
201 final Set<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> data, final Element element,
202 final Operation operation, final SchemaContext schemaContext,
203 final DataSchemaContextTree dataSchemaContextTree) {
204 if ((data == null) || data.isEmpty()) {
207 for (final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry : data) {
208 if (!ControllerContext.getInstance().isNodeMixin(entry.getKey())
209 && (!getLeafNodesOnly() || entry.getValue() instanceof LeafNode)) {
210 final Node node = createCreatedChangedDataChangeEventElement(doc, entry, operation, schemaContext,
211 dataSchemaContextTree);
212 element.appendChild(node);
218 * Creates changed event element from data.
223 * Path to data in data store.
226 * @return {@link Node} node represented by changed event element.
228 private Node createDataChangeEventElement(final Document doc, final YangInstanceIdentifier path,
229 final Operation operation) {
230 final Element dataChangeEventElement = doc.createElement("data-change-event");
231 final Element pathElement = doc.createElement("path");
232 addPathAsValueToElement(path, pathElement);
233 dataChangeEventElement.appendChild(pathElement);
235 final Element operationElement = doc.createElement("operation");
236 operationElement.setTextContent(operation.value);
237 dataChangeEventElement.appendChild(operationElement);
239 return dataChangeEventElement;
242 private Node createCreatedChangedDataChangeEventElement(final Document doc,
243 final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry, final Operation operation,
244 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
245 final Element dataChangeEventElement = doc.createElement("data-change-event");
246 final Element pathElement = doc.createElement("path");
247 final YangInstanceIdentifier path = entry.getKey();
248 addPathAsValueToElement(path, pathElement);
249 dataChangeEventElement.appendChild(pathElement);
251 final Element operationElement = doc.createElement("operation");
252 operationElement.setTextContent(operation.value);
253 dataChangeEventElement.appendChild(operationElement);
257 final NormalizedNode<?, ?> normalized = entry.getValue();
258 if ((normalized instanceof MapEntryNode) || (normalized instanceof UnkeyedListEntryNode)) {
259 nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath();
261 nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath().getParent();
263 final DOMResult domResult = writeNormalizedNode(normalized, schemaContext, nodePath);
264 final Node result = doc.importNode(domResult.getNode().getFirstChild(), true);
265 final Element dataElement = doc.createElement("data");
266 dataElement.appendChild(result);
267 dataChangeEventElement.appendChild(dataElement);
268 } catch (final IOException e) {
269 LOG.error("Error in writer ", e);
270 } catch (final XMLStreamException e) {
271 LOG.error("Error processing stream", e);
274 return dataChangeEventElement;
278 * Adds path as value to element.
281 * Path to data in data store.
285 @SuppressWarnings("rawtypes")
286 private void addPathAsValueToElement(final YangInstanceIdentifier path, final Element element) {
287 final YangInstanceIdentifier normalizedPath = ControllerContext.getInstance().toXpathRepresentation(path);
288 final StringBuilder textContent = new StringBuilder();
290 for (final PathArgument pathArgument : normalizedPath.getPathArguments()) {
291 if (pathArgument instanceof YangInstanceIdentifier.AugmentationIdentifier) {
294 textContent.append("/");
295 writeIdentifierWithNamespacePrefix(element, textContent, pathArgument.getNodeType());
296 if (pathArgument instanceof NodeIdentifierWithPredicates) {
297 final Map<QName, Object> predicates = ((NodeIdentifierWithPredicates) pathArgument).getKeyValues();
298 for (final QName keyValue : predicates.keySet()) {
299 final String predicateValue = String.valueOf(predicates.get(keyValue));
300 textContent.append("[");
301 writeIdentifierWithNamespacePrefix(element, textContent, keyValue);
302 textContent.append("='");
303 textContent.append(predicateValue);
304 textContent.append("'");
305 textContent.append("]");
307 } else if (pathArgument instanceof NodeWithValue) {
308 textContent.append("[.='");
309 textContent.append(((NodeWithValue) pathArgument).getValue());
310 textContent.append("'");
311 textContent.append("]");
314 element.setTextContent(textContent.toString());
318 * Writes identifier that consists of prefix and QName.
324 * @param qualifiedName
327 private static void writeIdentifierWithNamespacePrefix(final Element element, final StringBuilder textContent,
328 final QName qualifiedName) {
329 final Module module = ControllerContext.getInstance().getGlobalSchema()
330 .findModuleByNamespaceAndRevision(qualifiedName.getNamespace(), qualifiedName.getRevision());
332 textContent.append(module.getName());
333 textContent.append(":");
334 textContent.append(qualifiedName.getLocalName());
338 * Consists of three types {@link Operation#CREATED},
339 * {@link Operation#UPDATED} and {@link Operation#DELETED}.
341 private enum Operation {
342 CREATED("created"), UPDATED("updated"), DELETED("deleted");
344 private final String value;
346 Operation(final String value) {