--- /dev/null
+/*
+ * Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.netconf.sal.streams.listeners;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
+import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
+import org.opendaylight.yangtools.yang.model.api.NotificationDefinition;
+import org.opendaylight.yangtools.yang.model.api.SchemaPath;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * {@link Notificator} is responsible to create, remove and find
+ * {@link ListenerAdapter} listener.
+ */
+public class Notificator {
+
+ private static Map<String, ListenerAdapter> dataChangeListener = new ConcurrentHashMap<>();
+ private static Map<String, List<NotificationListenerAdapter>> notificationListenersByStreamName =
+ new ConcurrentHashMap<>();
+
+ private static final Logger LOG = LoggerFactory.getLogger(Notificator.class);
+ private static final Lock LOCK = new ReentrantLock();
+
+ private Notificator() {
+ }
+
+ /**
+ * Returns list of all stream names.
+ */
+ public static Set<String> getStreamNames() {
+ return dataChangeListener.keySet();
+ }
+
+ /**
+ * Gets {@link ListenerAdapter} specified by stream name.
+ *
+ * @param streamName
+ * The name of the stream.
+ * @return {@link ListenerAdapter} specified by stream name.
+ */
+ public static ListenerAdapter getListenerFor(final String streamName) {
+ return dataChangeListener.get(streamName);
+ }
+
+ /**
+ * Checks if the listener specified by {@link YangInstanceIdentifier} path exist.
+ *
+ * @param streamName name of the stream
+ * @return True if the listener exist, false otherwise.
+ */
+ public static boolean existListenerFor(final String streamName) {
+ return dataChangeListener.containsKey(streamName);
+ }
+
+ /**
+ * Creates new {@link ListenerAdapter} listener from
+ * {@link YangInstanceIdentifier} path and stream name.
+ *
+ * @param path
+ * Path to data in data repository.
+ * @param streamName
+ * The name of the stream.
+ * @param outputType
+ * Spcific type of output for notifications - XML or JSON
+ * @return New {@link ListenerAdapter} listener from
+ * {@link YangInstanceIdentifier} path and stream name.
+ */
+ public static ListenerAdapter createListener(final YangInstanceIdentifier path, final String streamName,
+ final NotificationOutputType outputType) {
+ final ListenerAdapter listener = new ListenerAdapter(path, streamName, outputType);
+ try {
+ LOCK.lock();
+ dataChangeListener.put(streamName, listener);
+ } finally {
+ LOCK.unlock();
+ }
+ return listener;
+ }
+
+ /**
+ * Looks for listener determined by {@link YangInstanceIdentifier} path and removes it.
+ * Creates String representation of stream name from URI. Removes slash from URI in start and end position.
+ *
+ * @param uri
+ * URI for creation stream name.
+ * @return String representation of stream name.
+ */
+ public static String createStreamNameFromUri(final String uri) {
+ if (uri == null) {
+ return null;
+ }
+ String result = uri;
+ if (result.startsWith("/")) {
+ result = result.substring(1);
+ }
+ if (result.endsWith("/")) {
+ result = result.substring(0, result.length() - 1);
+ }
+ return result;
+ }
+
+ /**
+ * Removes all listeners.
+ */
+ @SuppressWarnings("checkstyle:IllegalCatch")
+ public static void removeAllListeners() {
+ for (final ListenerAdapter listener : dataChangeListener.values()) {
+ try {
+ listener.close();
+ } catch (final Exception e) {
+ LOG.error("Failed to close listener", e);
+ }
+ }
+ try {
+ LOCK.lock();
+ dataChangeListener = new ConcurrentHashMap<>();
+ } finally {
+ LOCK.unlock();
+ }
+ }
+
+ /**
+ * Delete {@link ListenerAdapter} listener specified in parameter.
+ *
+ * @param <T>
+ *
+ * @param listener
+ * ListenerAdapter
+ */
+ @SuppressWarnings("checkstyle:IllegalCatch")
+ private static <T extends BaseListenerInterface> void deleteListener(final T listener) {
+ if (listener != null) {
+ try {
+ listener.close();
+ } catch (final Exception e) {
+ LOG.error("Failed to close listener", e);
+ }
+ try {
+ LOCK.lock();
+ dataChangeListener.remove(listener.getStreamName());
+ } finally {
+ LOCK.unlock();
+ }
+ }
+ }
+
+ /**
+ * Check if the listener specified by qnames of request exist.
+ *
+ * @param streamName
+ * name of stream
+ * @return True if the listener exist, false otherwise.
+ */
+ public static boolean existNotificationListenerFor(final String streamName) {
+ return notificationListenersByStreamName.containsKey(streamName);
+ }
+
+ /**
+ * Prepare listener for notification ({@link NotificationDefinition}).
+ *
+ * @param paths
+ * paths of notifications
+ * @param streamName
+ * name of stream (generated by paths)
+ * @param outputType
+ * type of output for onNotification - XML or JSON
+ * @return List of {@link NotificationListenerAdapter} by paths
+ */
+ public static List<NotificationListenerAdapter> createNotificationListener(final List<SchemaPath> paths,
+ final String streamName, final String outputType) {
+ final List<NotificationListenerAdapter> listListeners = new ArrayList<>();
+ for (final SchemaPath path : paths) {
+ final NotificationListenerAdapter listener = new NotificationListenerAdapter(path, streamName, outputType);
+ listListeners.add(listener);
+ }
+ try {
+ LOCK.lock();
+ notificationListenersByStreamName.put(streamName, listListeners);
+ } finally {
+ LOCK.unlock();
+ }
+ return listListeners;
+ }
+
+ public static <T extends BaseListenerInterface> void removeListenerIfNoSubscriberExists(final T listener) {
+ if (!listener.hasSubscribers()) {
+ if (listener instanceof NotificationListenerAdapter) {
+ deleteNotificationListener(listener);
+ } else {
+ deleteListener(listener);
+ }
+ }
+ }
+
+ @SuppressWarnings("checkstyle:IllegalCatch")
+ private static <T extends BaseListenerInterface> void deleteNotificationListener(final T listener) {
+ if (listener != null) {
+ try {
+ listener.close();
+ } catch (final Exception e) {
+ LOG.error("Failed to close listener", e);
+ }
+ try {
+ LOCK.lock();
+ notificationListenersByStreamName.remove(listener.getStreamName());
+ } finally {
+ LOCK.unlock();
+ }
+ }
+ }
+
+ public static List<NotificationListenerAdapter> getNotificationListenerFor(final String streamName) {
+ return notificationListenersByStreamName.get(streamName);
+ }
+}
Code Review / netconf.git / blobdiff