Bug 5679 - implement ietf-restconf-monitoring - cleanup
[netconf.git] / restconf / sal-rest-connector / src / main / java / org / opendaylight / netconf / sal / streams / listeners / ListenerAdapter.java
index 2289d2e4dd63945b83bea38672be8764abdca3f0..0b2c1dd34d8811b2f6e79ba1b2754d29ff32ecd5 100644 (file)
@@ -7,45 +7,19 @@
  */
 package org.opendaylight.netconf.sal.streams.listeners;
 
-import com.google.common.base.Charsets;
 import com.google.common.base.Preconditions;
-import com.google.common.eventbus.AsyncEventBus;
-import com.google.common.eventbus.EventBus;
-import com.google.common.eventbus.Subscribe;
-import io.netty.channel.Channel;
-import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
-import io.netty.util.internal.ConcurrentSet;
-import java.io.ByteArrayOutputStream;
 import java.io.IOException;
-import java.io.OutputStreamWriter;
-import java.io.UnsupportedEncodingException;
-import java.text.SimpleDateFormat;
-import java.util.Collection;
-import java.util.Date;
-import java.util.HashMap;
 import java.util.Map;
 import java.util.Map.Entry;
-import java.util.Random;
 import java.util.Set;
-import java.util.concurrent.Executors;
-import java.util.regex.Pattern;
-import javax.xml.parsers.DocumentBuilder;
-import javax.xml.parsers.DocumentBuilderFactory;
-import javax.xml.parsers.ParserConfigurationException;
-import javax.xml.stream.XMLOutputFactory;
 import javax.xml.stream.XMLStreamException;
-import javax.xml.stream.XMLStreamWriter;
-import javax.xml.transform.OutputKeys;
-import javax.xml.transform.Transformer;
-import javax.xml.transform.TransformerException;
-import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMResult;
-import javax.xml.transform.dom.DOMSource;
-import javax.xml.transform.stream.StreamResult;
+import org.json.JSONObject;
+import org.json.XML;
 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
 import org.opendaylight.controller.md.sal.dom.api.DOMDataChangeListener;
 import org.opendaylight.netconf.sal.restconf.impl.ControllerContext;
-import org.opendaylight.yangtools.concepts.ListenerRegistration;
+import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
 import org.opendaylight.yangtools.yang.common.QName;
 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.NodeIdentifierWithPredicates;
@@ -54,11 +28,8 @@ import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier.PathArgum
 import org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode;
 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
 import org.opendaylight.yangtools.yang.data.api.schema.UnkeyedListEntryNode;
-import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
-import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
-import org.opendaylight.yangtools.yang.data.impl.codec.xml.XMLStreamNormalizedNodeStreamWriter;
-import org.opendaylight.yangtools.yang.data.impl.codec.xml.XmlDocumentUtils;
 import org.opendaylight.yangtools.yang.data.util.DataSchemaContextTree;
+import org.opendaylight.yangtools.yang.model.api.Module;
 import org.opendaylight.yangtools.yang.model.api.SchemaContext;
 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
 import org.slf4j.Logger;
@@ -68,154 +39,94 @@ import org.w3c.dom.Element;
 import org.w3c.dom.Node;
 
 /**
- * {@link ListenerAdapter} is responsible to track events, which occurred by changing data in data source.
+ * {@link ListenerAdapter} is responsible to track events, which occurred by
+ * changing data in data source.
  */
-public class ListenerAdapter implements DOMDataChangeListener {
+public class ListenerAdapter extends AbstractCommonSubscriber implements DOMDataChangeListener {
 
     private static final Logger LOG = LoggerFactory.getLogger(ListenerAdapter.class);
-    private static final DocumentBuilderFactory DBF = DocumentBuilderFactory.newInstance();
-    private static final TransformerFactory FACTORY = TransformerFactory.newInstance();
-    private static final Pattern RFC3339_PATTERN = Pattern.compile("(\\d\\d)(\\d\\d)$");
-
-    private final SimpleDateFormat rfc3339 = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ssZ");
 
     private final YangInstanceIdentifier path;
-    private ListenerRegistration<DOMDataChangeListener> registration;
     private final String streamName;
-    private Set<Channel> subscribers = new ConcurrentSet<>();
-    private final EventBus eventBus;
-    private final EventBusChangeRecorder eventBusChangeRecorder;
+    private final NotificationOutputType outputType;
+
+    private AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change;
 
     /**
-     * Creates new {@link ListenerAdapter} listener specified by path and stream name.
+     * Creates new {@link ListenerAdapter} listener specified by path and stream
+     * name and register for subscribing
      *
      * @param path
      *            Path to data in data store.
      * @param streamName
      *            The name of the stream.
+     * @param outputType
+     *            - type of output on notification (JSON, XML)
      */
-    ListenerAdapter(final YangInstanceIdentifier path, final String streamName) {
-        Preconditions.checkNotNull(path);
-        Preconditions.checkArgument(streamName != null && !streamName.isEmpty());
-        this.path = path;
+    ListenerAdapter(final YangInstanceIdentifier path, final String streamName,
+            final NotificationOutputType outputType) {
+        super();
+        register(this);
+        setLocalNameOfPath(path.getLastPathArgument().getNodeType().getLocalName());
+
+        this.outputType = Preconditions.checkNotNull(outputType);
+        this.path = Preconditions.checkNotNull(path);
+        Preconditions.checkArgument((streamName != null) && !streamName.isEmpty());
         this.streamName = streamName;
-        eventBus = new AsyncEventBus(Executors.newSingleThreadExecutor());
-        eventBusChangeRecorder = new EventBusChangeRecorder();
-        eventBus.register(eventBusChangeRecorder);
     }
 
     @Override
     public void onDataChanged(final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change) {
-        if (!change.getCreatedData().isEmpty() || !change.getUpdatedData().isEmpty()
-                || !change.getRemovedPaths().isEmpty()) {
-            final String xml = prepareXmlFrom(change);
-            final Event event = new Event(EventType.NOTIFY);
-            event.setData(xml);
-            eventBus.post(event);
+        this.change = change;
+        final String xml = prepareXml();
+        if (checkQueryParams(xml, this)) {
+            prepareAndPostData(xml);
         }
     }
 
     /**
-     * Tracks events of data change by customer.
+     * Gets the name of the stream.
+     *
+     * @return The name of the stream.
      */
-    private final class EventBusChangeRecorder {
-        @Subscribe
-        public void recordCustomerChange(final Event event) {
-            if (event.getType() == EventType.REGISTER) {
-                final Channel subscriber = event.getSubscriber();
-                if (!subscribers.contains(subscriber)) {
-                    subscribers.add(subscriber);
-                }
-            } else if (event.getType() == EventType.DEREGISTER) {
-                subscribers.remove(event.getSubscriber());
-                Notificator.removeListenerIfNoSubscriberExists(ListenerAdapter.this);
-            } else if (event.getType() == EventType.NOTIFY) {
-                for (final Channel subscriber : subscribers) {
-                    if (subscriber.isActive()) {
-                        LOG.debug("Data are sent to subscriber {}:", subscriber.remoteAddress());
-                        subscriber.writeAndFlush(new TextWebSocketFrame(event.getData()));
-                    } else {
-                        LOG.debug("Subscriber {} is removed - channel is not active yet.", subscriber.remoteAddress());
-                        subscribers.remove(subscriber);
-                    }
-                }
-            }
-        }
+    @Override
+    public String getStreamName() {
+        return this.streamName;
+    }
+
+    @Override
+    public String getOutputType() {
+        return this.outputType.getName();
     }
 
     /**
-     * Represents event of specific {@link EventType} type, holds data and {@link Channel} subscriber.
+     * Get path pointed to data in data store.
+     *
+     * @return Path pointed to data in data store.
      */
-    private final class Event {
-        private final EventType type;
-        private Channel subscriber;
-        private String data;
-
-        /**
-         * Creates new event specified by {@link EventType} type.
-         *
-         * @param type
-         *            EventType
-         */
-        public Event(final EventType type) {
-            this.type = type;
-        }
-
-        /**
-         * Gets the {@link Channel} subscriber.
-         *
-         * @return Channel
-         */
-        public Channel getSubscriber() {
-            return subscriber;
-        }
-
-        /**
-         * Sets subscriber for event.
-         *
-         * @param subscriber
-         *            Channel
-         */
-        public void setSubscriber(final Channel subscriber) {
-            this.subscriber = subscriber;
-        }
-
-        /**
-         * Gets event String.
-         *
-         * @return String representation of event data.
-         */
-        public String getData() {
-            return data;
-        }
-
-        /**
-         * Sets event data.
-         *
-         * @param data String.
-         */
-        public void setData(final String data) {
-            this.data = data;
-        }
+    public YangInstanceIdentifier getPath() {
+        return this.path;
+    }
 
-        /**
-         * Gets event type.
-         *
-         * @return The type of the event.
-         */
-        public EventType getType() {
-            return type;
+    /**
+     * Prepare data of notification and data to client
+     *
+     * @param xml
+     */
+    private void prepareAndPostData(final String xml) {
+        final Event event = new Event(EventType.NOTIFY);
+        if (this.outputType.equals(NotificationOutputType.JSON)) {
+            final JSONObject jsonObject = XML.toJSONObject(xml);
+            event.setData(jsonObject.toString());
+        } else {
+            event.setData(xml);
         }
+        post(event);
     }
 
     /**
-     * Type of the event.
+     * Tracks events of data change by customer.
      */
-    private enum EventType {
-        REGISTER,
-        DEREGISTER,
-        NOTIFY;
-    }
 
     /**
      * Prepare data in printable form and transform it to String.
@@ -224,65 +135,19 @@ public class ListenerAdapter implements DOMDataChangeListener {
      *            DataChangeEvent
      * @return Data in printable form.
      */
-    private String prepareXmlFrom(final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change) {
+    private String prepareXml() {
         final SchemaContext schemaContext = ControllerContext.getInstance().getGlobalSchema();
-        final DataSchemaContextTree dataContextTree =  DataSchemaContextTree.from(schemaContext);
+        final DataSchemaContextTree dataContextTree = DataSchemaContextTree.from(schemaContext);
         final Document doc = createDocument();
-        final Element notificationElement = doc.createElementNS("urn:ietf:params:xml:ns:netconf:notification:1.0",
-                "notification");
-        doc.appendChild(notificationElement);
-
-        final Element eventTimeElement = doc.createElement("eventTime");
-        eventTimeElement.setTextContent(toRFC3339(new Date()));
-        notificationElement.appendChild(eventTimeElement);
+        final Element notificationElement = basePartDoc(doc);
 
         final Element dataChangedNotificationEventElement = doc.createElementNS(
                 "urn:opendaylight:params:xml:ns:yang:controller:md:sal:remote", "data-changed-notification");
-        addValuesToDataChangedNotificationEventElement(doc, dataChangedNotificationEventElement, change,
+
+        addValuesToDataChangedNotificationEventElement(doc, dataChangedNotificationEventElement, this.change,
                 schemaContext, dataContextTree);
         notificationElement.appendChild(dataChangedNotificationEventElement);
-
-        try {
-            final ByteArrayOutputStream out = new ByteArrayOutputStream();
-            final Transformer transformer = FACTORY.newTransformer();
-            transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
-            transformer.setOutputProperty(OutputKeys.METHOD, "xml");
-            transformer.setOutputProperty(OutputKeys.INDENT, "yes");
-            transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
-            transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
-            transformer.transform(new DOMSource(doc), new StreamResult(new OutputStreamWriter(out, Charsets.UTF_8)));
-            final byte[] charData = out.toByteArray();
-            return new String(charData, "UTF-8");
-        } catch (TransformerException | UnsupportedEncodingException e) {
-            final String msg = "Error during transformation of Document into String";
-            LOG.error(msg, e);
-            return msg;
-        }
-    }
-
-    /**
-     * Formats data specified by RFC3339.
-     *
-     * @param d
-     *            Date
-     * @return Data specified by RFC3339.
-     */
-    private String toRFC3339(final Date d) {
-        return RFC3339_PATTERN.matcher(rfc3339.format(d)).replaceAll("$1:$2");
-    }
-
-    /**
-     * Creates {@link Document} document.
-     * @return {@link Document} document.
-     */
-    private Document createDocument() {
-        final DocumentBuilder bob;
-        try {
-            bob = DBF.newDocumentBuilder();
-        } catch (final ParserConfigurationException e) {
-            return null;
-        }
-        return bob.newDocument();
+        return transformDoc(doc);
     }
 
     /**
@@ -298,15 +163,13 @@ public class ListenerAdapter implements DOMDataChangeListener {
     private void addValuesToDataChangedNotificationEventElement(final Document doc,
             final Element dataChangedNotificationEventElement,
             final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change,
-            final SchemaContext  schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
+            final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
 
         addCreatedChangedValuesFromDataToElement(doc, change.getCreatedData().entrySet(),
-                dataChangedNotificationEventElement,
-                Operation.CREATED, schemaContext, dataSchemaContextTree);
+                dataChangedNotificationEventElement, Operation.CREATED, schemaContext, dataSchemaContextTree);
 
         addCreatedChangedValuesFromDataToElement(doc, change.getUpdatedData().entrySet(),
-                    dataChangedNotificationEventElement,
-                    Operation.UPDATED, schemaContext, dataSchemaContextTree);
+                dataChangedNotificationEventElement, Operation.UPDATED, schemaContext, dataSchemaContextTree);
 
         addValuesFromDataToElement(doc, change.getRemovedPaths(), dataChangedNotificationEventElement,
                 Operation.DELETED);
@@ -324,9 +187,9 @@ public class ListenerAdapter implements DOMDataChangeListener {
      * @param operation
      *            {@link Operation}
      */
-    private void addValuesFromDataToElement(final Document doc, final Set<YangInstanceIdentifier> data, final Element element,
-            final Operation operation) {
-        if (data == null || data.isEmpty()) {
+    private void addValuesFromDataToElement(final Document doc, final Set<YangInstanceIdentifier> data,
+            final Element element, final Operation operation) {
+        if ((data == null) || data.isEmpty()) {
             return;
         }
         for (final YangInstanceIdentifier path : data) {
@@ -337,13 +200,14 @@ public class ListenerAdapter implements DOMDataChangeListener {
         }
     }
 
-    private void addCreatedChangedValuesFromDataToElement(final Document doc, final Set<Entry<YangInstanceIdentifier,
-                NormalizedNode<?,?>>> data, final Element element, final Operation operation, final SchemaContext
-            schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
-        if (data == null || data.isEmpty()) {
+    private void addCreatedChangedValuesFromDataToElement(final Document doc,
+            final Set<Entry<YangInstanceIdentifier, NormalizedNode<?, ?>>> data, final Element element,
+            final Operation operation, final SchemaContext schemaContext,
+            final DataSchemaContextTree dataSchemaContextTree) {
+        if ((data == null) || data.isEmpty()) {
             return;
         }
-        for (Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry : data) {
+        for (final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry : data) {
             if (!ControllerContext.getInstance().isNodeMixin(entry.getKey())) {
                 final Node node = createCreatedChangedDataChangeEventElement(doc, entry, operation, schemaContext,
                         dataSchemaContextTree);
@@ -363,7 +227,8 @@ public class ListenerAdapter implements DOMDataChangeListener {
      *            {@link Operation}
      * @return {@link Node} node represented by changed event element.
      */
-    private Node createDataChangeEventElement(final Document doc, final YangInstanceIdentifier path, final Operation operation) {
+    private Node createDataChangeEventElement(final Document doc, final YangInstanceIdentifier path,
+            final Operation operation) {
         final Element dataChangeEventElement = doc.createElement("data-change-event");
         final Element pathElement = doc.createElement("path");
         addPathAsValueToElement(path, pathElement);
@@ -376,9 +241,9 @@ public class ListenerAdapter implements DOMDataChangeListener {
         return dataChangeEventElement;
     }
 
-    private Node createCreatedChangedDataChangeEventElement(final Document doc, final Entry<YangInstanceIdentifier,
-            NormalizedNode<?, ?>> entry, final Operation operation, final SchemaContext
-            schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
+    private Node createCreatedChangedDataChangeEventElement(final Document doc,
+            final Entry<YangInstanceIdentifier, NormalizedNode<?, ?>> entry, final Operation operation,
+            final SchemaContext schemaContext, final DataSchemaContextTree dataSchemaContextTree) {
         final Element dataChangeEventElement = doc.createElement("data-change-event");
         final Element pathElement = doc.createElement("path");
         final YangInstanceIdentifier path = entry.getKey();
@@ -390,61 +255,27 @@ public class ListenerAdapter implements DOMDataChangeListener {
         dataChangeEventElement.appendChild(operationElement);
 
         try {
-            final DOMResult domResult = writeNormalizedNode(entry.getValue(), path,
-                    schemaContext, dataSchemaContextTree);
+            SchemaPath nodePath;
+            final NormalizedNode<?, ?> normalized = entry.getValue();
+            if ((normalized instanceof MapEntryNode) || (normalized instanceof UnkeyedListEntryNode)) {
+                nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath();
+            } else {
+                nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath().getParent();
+            }
+            final DOMResult domResult = writeNormalizedNode(normalized, schemaContext, nodePath);
             final Node result = doc.importNode(domResult.getNode().getFirstChild(), true);
             final Element dataElement = doc.createElement("data");
             dataElement.appendChild(result);
             dataChangeEventElement.appendChild(dataElement);
-        } catch (IOException e) {
+        } catch (final IOException e) {
             LOG.error("Error in writer ", e);
-        } catch (XMLStreamException e) {
+        } catch (final XMLStreamException e) {
             LOG.error("Error processing stream", e);
         }
 
         return dataChangeEventElement;
     }
 
-    private static DOMResult writeNormalizedNode(final NormalizedNode<?,?> normalized, final
-        YangInstanceIdentifier path, final SchemaContext context, final DataSchemaContextTree dataSchemaContextTree) throws
-            IOException, XMLStreamException {
-        final XMLOutputFactory XML_FACTORY = XMLOutputFactory.newFactory();
-        final Document doc = XmlDocumentUtils.getDocument();
-        final DOMResult result = new DOMResult(doc);
-        NormalizedNodeWriter normalizedNodeWriter = null;
-        NormalizedNodeStreamWriter normalizedNodeStreamWriter = null;
-        XMLStreamWriter writer = null;
-        final SchemaPath nodePath;
-
-        if (normalized instanceof MapEntryNode || normalized instanceof UnkeyedListEntryNode) {
-            nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath();
-        } else {
-            nodePath = dataSchemaContextTree.getChild(path).getDataSchemaNode().getPath().getParent();
-        }
-
-        try {
-            writer = XML_FACTORY.createXMLStreamWriter(result);
-            normalizedNodeStreamWriter = XMLStreamNormalizedNodeStreamWriter.create(writer, context, nodePath);
-            normalizedNodeWriter = NormalizedNodeWriter.forStreamWriter(normalizedNodeStreamWriter);
-
-            normalizedNodeWriter.write(normalized);
-
-            normalizedNodeWriter.flush();
-        } finally {
-            if (normalizedNodeWriter != null) {
-                normalizedNodeWriter.close();
-            }
-            if (normalizedNodeStreamWriter != null) {
-                normalizedNodeStreamWriter.close();
-            }
-            if (writer != null) {
-                writer.close();
-            }
-        }
-
-        return result;
-    }
-
     /**
      * Adds path as value to element.
      *
@@ -453,25 +284,23 @@ public class ListenerAdapter implements DOMDataChangeListener {
      * @param element
      *            {@link Element}
      */
+    @SuppressWarnings("rawtypes")
     private void addPathAsValueToElement(final YangInstanceIdentifier path, final Element element) {
-        // Map< key = namespace, value = prefix>
-        final Map<String, String> prefixes = new HashMap<>();
         final YangInstanceIdentifier normalizedPath = ControllerContext.getInstance().toXpathRepresentation(path);
         final StringBuilder textContent = new StringBuilder();
 
-        // FIXME: BUG-1281: this is duplicated code from yangtools (BUG-1275)
         for (final PathArgument pathArgument : normalizedPath.getPathArguments()) {
             if (pathArgument instanceof YangInstanceIdentifier.AugmentationIdentifier) {
                 continue;
             }
             textContent.append("/");
-            writeIdentifierWithNamespacePrefix(element, textContent, pathArgument.getNodeType(), prefixes);
+            writeIdentifierWithNamespacePrefix(element, textContent, pathArgument.getNodeType());
             if (pathArgument instanceof NodeIdentifierWithPredicates) {
                 final Map<QName, Object> predicates = ((NodeIdentifierWithPredicates) pathArgument).getKeyValues();
                 for (final QName keyValue : predicates.keySet()) {
                     final String predicateValue = String.valueOf(predicates.get(keyValue));
                     textContent.append("[");
-                    writeIdentifierWithNamespacePrefix(element, textContent, keyValue, prefixes);
+                    writeIdentifierWithNamespacePrefix(element, textContent, keyValue);
                     textContent.append("='");
                     textContent.append(predicateValue);
                     textContent.append("'");
@@ -496,151 +325,23 @@ public class ListenerAdapter implements DOMDataChangeListener {
      *            StringBuilder
      * @param qName
      *            QName
-     * @param prefixes
-     *            Map of namespaces and prefixes.
      */
     private static void writeIdentifierWithNamespacePrefix(final Element element, final StringBuilder textContent,
-            final QName qName, final Map<String, String> prefixes) {
-        final String namespace = qName.getNamespace().toString();
-        String prefix = prefixes.get(namespace);
-        if (prefix == null) {
-            prefix = generateNewPrefix(prefixes.values());
-        }
-
-        element.setAttribute("xmlns:" + prefix, namespace);
-        textContent.append(prefix);
-        prefixes.put(namespace, prefix);
+            final QName qName) {
+        final Module module = ControllerContext.getInstance().getGlobalSchema()
+                .findModuleByNamespaceAndRevision(qName.getNamespace(), qName.getRevision());
 
+        textContent.append(module.getName());
         textContent.append(":");
         textContent.append(qName.getLocalName());
     }
 
     /**
-     * Generates new prefix which consists of four random characters <a-z>.
-     *
-     * @param prefixes
-     *            Collection of prefixes.
-     * @return New prefix which consists of four random characters <a-z>.
-     */
-    private static String generateNewPrefix(final Collection<String> prefixes) {
-        StringBuilder result = null;
-        final Random random = new Random();
-        do {
-            result = new StringBuilder();
-            for (int i = 0; i < 4; i++) {
-                final int randomNumber = 0x61 + (Math.abs(random.nextInt()) % 26);
-                result.append(Character.toChars(randomNumber));
-            }
-        } while (prefixes.contains(result.toString()));
-
-        return result.toString();
-    }
-
-    /**
-     * Gets path pointed to data in data store.
-     *
-     * @return Path pointed to data in data store.
-     */
-    public YangInstanceIdentifier getPath() {
-        return path;
-    }
-
-    /**
-     * Sets {@link ListenerRegistration} registration.
-     *
-     * @param registration DOMDataChangeListener registration
-     */
-    public void setRegistration(final ListenerRegistration<DOMDataChangeListener> registration) {
-        this.registration = registration;
-    }
-
-    /**
-     * Gets the name of the stream.
-     *
-     * @return The name of the stream.
-     */
-    public String getStreamName() {
-        return streamName;
-    }
-
-    /**
-     * Removes all subscribers and unregisters event bus change recorder form event bus.
-     */
-    public void close() throws Exception {
-        subscribers = new ConcurrentSet<>();
-        registration.close();
-        registration = null;
-        eventBus.unregister(eventBusChangeRecorder);
-    }
-
-    /**
-     * Checks if {@link ListenerRegistration} registration exist.
-     *
-     * @return True if exist, false otherwise.
-     */
-    public boolean isListening() {
-        return registration == null ? false : true;
-    }
-
-    /**
-     * Creates event of type {@link EventType#REGISTER}, set {@link Channel} subscriber to the event and post event into
-     * event bus.
-     *
-     * @param subscriber
-     *            Channel
-     */
-    public void addSubscriber(final Channel subscriber) {
-        if (!subscriber.isActive()) {
-            LOG.debug("Channel is not active between websocket server and subscriber {}" + subscriber.remoteAddress());
-        }
-        final Event event = new Event(EventType.REGISTER);
-        event.setSubscriber(subscriber);
-        eventBus.post(event);
-    }
-
-    /**
-     * Creates event of type {@link EventType#DEREGISTER}, sets {@link Channel} subscriber to the event and posts event
-     * into event bus.
-     *
-     * @param subscriber
-     */
-    public void removeSubscriber(final Channel subscriber) {
-        LOG.debug("Subscriber {} is removed.", subscriber.remoteAddress());
-        final Event event = new Event(EventType.DEREGISTER);
-        event.setSubscriber(subscriber);
-        eventBus.post(event);
-    }
-
-    /**
-     * Checks if exists at least one {@link Channel} subscriber.
-     *
-     * @return True if exist at least one {@link Channel} subscriber, false otherwise.
-     */
-    public boolean hasSubscribers() {
-        return !subscribers.isEmpty();
-    }
-
-    /**
-     * Consists of two types {@link Store#CONFIG} and {@link Store#OPERATION}.
-     */
-    private static enum Store {
-        CONFIG("config"),
-        OPERATION("operation");
-
-        private final String value;
-
-        private Store(final String value) {
-            this.value = value;
-        }
-    }
-
-    /**
-     * Consists of three types {@link Operation#CREATED}, {@link Operation#UPDATED} and {@link Operation#DELETED}.
+     * Consists of three types {@link Operation#CREATED},
+     * {@link Operation#UPDATED} and {@link Operation#DELETED}.
      */
     private static enum Operation {
-        CREATED("created"),
-        UPDATED("updated"),
-        DELETED("deleted");
+        CREATED("created"), UPDATED("updated"), DELETED("deleted");
 
         private final String value;
 
@@ -648,5 +349,4 @@ public class ListenerAdapter implements DOMDataChangeListener {
             this.value = value;
         }
     }
-
 }