2 * Copyright (c) 2014 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;
17 import org.json.JSONObject;
19 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
20 import org.opendaylight.controller.md.sal.dom.api.DOMDataChangeListener;
21 import org.opendaylight.netconf.sal.restconf.impl.ControllerContext;
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.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 final JSONObject jsonObject = XML.toJSONObject(xml);
120 event.setData(jsonObject.toString());
128 * Tracks events of data change by customer.
132 * Prepare data in printable form and transform it to String.
136 * @return Data in printable form.
138 private String prepareXml() {
139 final SchemaContext schemaContext = ControllerContext.getInstance().getGlobalSchema();
140 final DataSchemaContextTree dataContextTree = DataSchemaContextTree.from(schemaContext);
141 final Document doc = createDocument();
142 final Element notificationElement = basePartDoc(doc);
144 final Element dataChangedNotificationEventElement = doc.createElementNS(
145 "urn:opendaylight:params:xml:ns:yang:controller:md:sal:remote", "data-changed-notification");
147 addValuesToDataChangedNotificationEventElement(doc, dataChangedNotificationEventElement, this.change,
148 schemaContext, dataContextTree);
149 notificationElement.appendChild(dataChangedNotificationEventElement);
150 return transformDoc(doc);
154 * Adds values to data changed notification event element.
158 * @param dataChangedNotificationEventElement
161 * {@link AsyncDataChangeEvent}
163 private void addValuesToDataChangedNotificationEventElement(final Document doc,
164 final Element dataChangedNotificationEventElement,
165 final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change,
166 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
168 addCreatedChangedValuesFromDataToElement(doc, change.getCreatedData().entrySet(),
169 dataChangedNotificationEventElement, Operation.CREATED, schemaContext, dataSchemaContextTree);
171 addCreatedChangedValuesFromDataToElement(doc, change.getUpdatedData().entrySet(),
172 dataChangedNotificationEventElement, Operation.UPDATED, schemaContext, dataSchemaContextTree);
174 addValuesFromDataToElement(doc, change.getRemovedPaths(), dataChangedNotificationEventElement,
179 * Adds values from data to element.
184 * Set of {@link YangInstanceIdentifier}.
190 private void addValuesFromDataToElement(final Document doc, final Set<YangInstanceIdentifier> data,
191 final Element element, final Operation operation) {
192 if ((data == null) || data.isEmpty()) {
195 for (final YangInstanceIdentifier path : data) {
196 if (!ControllerContext.getInstance().isNodeMixin(path)) {
197 final Node node = createDataChangeEventElement(doc, path, operation);
198 element.appendChild(node);
203 private void addCreatedChangedValuesFromDataToElement(final Document doc,
204 final Set<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> data, final Element element,
205 final Operation operation, final SchemaContext schemaContext,
206 final DataSchemaContextTree dataSchemaContextTree) {
207 if ((data == null) || data.isEmpty()) {
210 for (final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry : data) {
211 if (!ControllerContext.getInstance().isNodeMixin(entry.getKey())) {
212 final Node node = createCreatedChangedDataChangeEventElement(doc, entry, operation, schemaContext,
213 dataSchemaContextTree);
214 element.appendChild(node);
220 * Creates changed event element from data.
225 * Path to data in data store.
228 * @return {@link Node} node represented by changed event element.
230 private Node createDataChangeEventElement(final Document doc, final YangInstanceIdentifier path,
231 final Operation operation) {
232 final Element dataChangeEventElement = doc.createElement("data-change-event");
233 final Element pathElement = doc.createElement("path");
234 addPathAsValueToElement(path, pathElement);
235 dataChangeEventElement.appendChild(pathElement);
237 final Element operationElement = doc.createElement("operation");
238 operationElement.setTextContent(operation.value);
239 dataChangeEventElement.appendChild(operationElement);
241 return dataChangeEventElement;
244 private Node createCreatedChangedDataChangeEventElement(final Document doc,
245 final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry, final Operation operation,
246 final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
247 final Element dataChangeEventElement = doc.createElement("data-change-event");
248 final Element pathElement = doc.createElement("path");
249 final YangInstanceIdentifier path = entry.getKey();
250 addPathAsValueToElement(path, pathElement);
251 dataChangeEventElement.appendChild(pathElement);
253 final Element operationElement = doc.createElement("operation");
254 operationElement.setTextContent(operation.value);
255 dataChangeEventElement.appendChild(operationElement);
259 final NormalizedNode<?, ?> normalized = entry.getValue();
260 if ((normalized instanceof MapEntryNode) || (normalized instanceof UnkeyedListEntryNode)) {
261 nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath();
263 nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath().getParent();
265 final DOMResult domResult = writeNormalizedNode(normalized, schemaContext, nodePath);
266 final Node result = doc.importNode(domResult.getNode().getFirstChild(), true);
267 final Element dataElement = doc.createElement("data");
268 dataElement.appendChild(result);
269 dataChangeEventElement.appendChild(dataElement);
270 } catch (final IOException e) {
271 LOG.error("Error in writer ", e);
272 } catch (final XMLStreamException e) {
273 LOG.error("Error processing stream", e);
276 return dataChangeEventElement;
280 * Adds path as value to element.
283 * Path to data in data store.
287 @SuppressWarnings("rawtypes")
288 private void addPathAsValueToElement(final YangInstanceIdentifier path, final Element element) {
289 final YangInstanceIdentifier normalizedPath = ControllerContext.getInstance().toXpathRepresentation(path);
290 final StringBuilder textContent = new StringBuilder();
292 for (final PathArgument pathArgument : normalizedPath.getPathArguments()) {
293 if (pathArgument instanceof YangInstanceIdentifier.AugmentationIdentifier) {
296 textContent.append("/");
297 writeIdentifierWithNamespacePrefix(element, textContent, pathArgument.getNodeType());
298 if (pathArgument instanceof NodeIdentifierWithPredicates) {
299 final Map<QName, Object> predicates = ((NodeIdentifierWithPredicates) pathArgument).getKeyValues();
300 for (final QName keyValue : predicates.keySet()) {
301 final String predicateValue = String.valueOf(predicates.get(keyValue));
302 textContent.append("[");
303 writeIdentifierWithNamespacePrefix(element, textContent, keyValue);
304 textContent.append("='");
305 textContent.append(predicateValue);
306 textContent.append("'");
307 textContent.append("]");
309 } else if (pathArgument instanceof NodeWithValue) {
310 textContent.append("[.='");
311 textContent.append(((NodeWithValue) pathArgument).getValue());
312 textContent.append("'");
313 textContent.append("]");
316 element.setTextContent(textContent.toString());
320 * Writes identifier that consists of prefix and QName.
329 private static void writeIdentifierWithNamespacePrefix(final Element element, final StringBuilder textContent,
331 final Module module = ControllerContext.getInstance().getGlobalSchema()
332 .findModuleByNamespaceAndRevision(qName.getNamespace(), qName.getRevision());
334 textContent.append(module.getName());
335 textContent.append(":");
336 textContent.append(qName.getLocalName());
340 * Consists of three types {@link Operation#CREATED},
341 * {@link Operation#UPDATED} and {@link Operation#DELETED}.
343 private static enum Operation {
344 CREATED("created"), UPDATED("updated"), DELETED("deleted");
346 private final String value;
348 private Operation(final String value) {