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/*
* 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.netconf.sal.restconf.impl.ControllerContext;
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.stmt.SchemaNodeIdentifier.Absolute;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* {@link Notificator} is responsible to create, remove and find
* {@link ListenerAdapter} listener.
*/
public final 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 ControllerContext controllerContext) {
final ListenerAdapter listener = new ListenerAdapter(path, streamName, outputType, controllerContext);
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<Absolute> paths,
final String streamName, final String outputType, final ControllerContext controllerContext) {
final List<NotificationListenerAdapter> listListeners = new ArrayList<>();
for (final Absolute path : paths) {
final NotificationListenerAdapter listener =
new NotificationListenerAdapter(path, streamName, outputType, controllerContext);
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);
}
}
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