2 * Copyright (c) 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.restconf.nb.rfc8040.streams.listeners;
10 import static com.google.common.base.Preconditions.checkArgument;
11 import static com.google.common.base.Preconditions.checkState;
12 import static java.util.Objects.requireNonNull;
14 import com.google.common.base.MoreObjects;
15 import com.google.common.base.MoreObjects.ToStringHelper;
16 import java.time.Instant;
17 import java.time.format.DateTimeFormatter;
18 import java.time.format.DateTimeFormatterBuilder;
19 import java.time.format.DateTimeParseException;
20 import java.time.temporal.ChronoField;
21 import java.time.temporal.TemporalAccessor;
22 import java.util.HashSet;
23 import java.util.Iterator;
25 import java.util.concurrent.ExecutionException;
26 import javax.xml.xpath.XPathExpressionException;
27 import org.checkerframework.checker.lock.qual.GuardedBy;
28 import org.checkerframework.checker.lock.qual.Holding;
29 import org.eclipse.jdt.annotation.NonNull;
30 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
31 import org.opendaylight.restconf.nb.rfc8040.NotificationQueryParams;
32 import org.opendaylight.restconf.nb.rfc8040.streams.StreamSessionHandler;
33 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.DateAndTime;
34 import org.opendaylight.yang.gen.v1.urn.sal.restconf.event.subscription.rev140708.NotificationOutputTypeGrouping.NotificationOutputType;
35 import org.opendaylight.yangtools.concepts.Registration;
36 import org.slf4j.Logger;
37 import org.slf4j.LoggerFactory;
40 * Features of subscribing part of both notifications.
42 abstract class AbstractCommonSubscriber<T> extends AbstractNotificationsData implements BaseListenerInterface {
43 private static final Logger LOG = LoggerFactory.getLogger(AbstractCommonSubscriber.class);
44 private static final DateTimeFormatter FORMATTER = new DateTimeFormatterBuilder()
45 .appendValue(ChronoField.YEAR, 4).appendLiteral('-')
46 .appendValue(ChronoField.MONTH_OF_YEAR, 2).appendLiteral('-')
47 .appendValue(ChronoField.DAY_OF_MONTH, 2).appendLiteral('T')
48 .appendValue(ChronoField.HOUR_OF_DAY, 2).appendLiteral(':')
49 .appendValue(ChronoField.MINUTE_OF_HOUR, 2).appendLiteral(':')
50 .appendValue(ChronoField.SECOND_OF_MINUTE, 2)
51 .appendFraction(ChronoField.NANO_OF_SECOND, 0, 9, true)
52 .appendOffset("+HH:MM", "Z").toFormatter();
54 private final EventFormatterFactory<T> formatterFactory;
55 private final NotificationOutputType outputType;
56 private final String streamName;
59 private final Set<StreamSessionHandler> subscribers = new HashSet<>();
61 private Registration registration;
63 // FIXME: these should be final
64 private Instant start = null;
65 private Instant stop = null;
66 private boolean leafNodesOnly = false;
67 private boolean skipNotificationData = false;
68 private boolean changedLeafNodesOnly = false;
69 private EventFormatter<T> formatter;
71 AbstractCommonSubscriber(final String streamName, final NotificationOutputType outputType,
72 final EventFormatterFactory<T> formatterFactory) {
73 this.streamName = requireNonNull(streamName);
74 checkArgument(!streamName.isEmpty());
76 this.outputType = requireNonNull(outputType);
77 this.formatterFactory = requireNonNull(formatterFactory);
78 formatter = formatterFactory.getFormatter();
82 public final String getStreamName() {
87 public final String getOutputType() {
88 return outputType.getName();
92 public final synchronized boolean hasSubscribers() {
93 return !subscribers.isEmpty();
97 public final synchronized Set<StreamSessionHandler> getSubscribers() {
98 return new HashSet<>(subscribers);
102 public final synchronized void close() throws InterruptedException, ExecutionException {
103 if (registration != null) {
104 registration.close();
107 deleteDataInDS(streamName).get();
112 public synchronized void addSubscriber(final StreamSessionHandler subscriber) {
113 final boolean isConnected = subscriber.isConnected();
114 checkState(isConnected);
115 LOG.debug("Subscriber {} is added.", subscriber);
116 subscribers.add(subscriber);
120 public synchronized void removeSubscriber(final StreamSessionHandler subscriber) {
121 subscribers.remove(subscriber);
122 LOG.debug("Subscriber {} is removed", subscriber);
123 if (!hasSubscribers()) {
124 ListenersBroker.getInstance().removeAndCloseListener(this);
128 public final Instant getStart() {
133 * Set query parameters for listener.
135 * @param params NotificationQueryParams to use.
137 public final void setQueryParams(final NotificationQueryParams params) {
138 final var startTime = params.startTime();
139 start = startTime == null ? Instant.now() : parseDateAndTime(startTime.value());
141 final var stopTime = params.stopTime();
142 stop = stopTime == null ? null : parseDateAndTime(stopTime.value());
144 final var leafNodes = params.leafNodesOnly();
145 leafNodesOnly = leafNodes != null && leafNodes.value();
147 final var skipData = params.skipNotificationData();
148 skipNotificationData = skipData != null && skipData.value();
150 final var changedLeafNodes = params.changedLeafNodesOnly();
151 changedLeafNodesOnly = changedLeafNodes != null && changedLeafNodes.value();
153 final var filter = params.filter();
154 final String filterValue = filter == null ? null : filter.paramValue();
155 if (filterValue != null && !filterValue.isEmpty()) {
157 formatter = formatterFactory.getFormatter(filterValue);
158 } catch (XPathExpressionException e) {
159 throw new IllegalArgumentException("Failed to get filter", e);
162 formatter = formatterFactory.getFormatter();
167 * Check whether this query should only notify about leaf node changes.
169 * @return true if this query should only notify about leaf node changes
171 final boolean getLeafNodesOnly() {
172 return leafNodesOnly;
176 * Check whether this query should only notify about leaf node changes and report only changed nodes.
178 * @return true if this query should only notify about leaf node changes and report only changed nodes
180 final boolean getChangedLeafNodesOnly() {
181 return changedLeafNodesOnly;
185 * Check whether this query should notify changes without data.
187 * @return true if this query should notify about changes with data
189 final boolean isSkipNotificationData() {
190 return skipNotificationData;
193 final EventFormatter<T> formatter() {
198 * Sets {@link Registration} registration.
200 * @param registration a listener registration registration.
203 final void setRegistration(final Registration registration) {
204 this.registration = requireNonNull(registration);
208 * Checks if {@link Registration} registration exists.
210 * @return {@code true} if exists, {@code false} otherwise.
213 final boolean isListening() {
214 return registration != null;
218 * Post data to subscribed SSE session handlers.
220 * @param data Data of incoming notifications.
222 synchronized void post(final String data) {
223 final Iterator<StreamSessionHandler> iterator = subscribers.iterator();
224 while (iterator.hasNext()) {
225 final StreamSessionHandler subscriber = iterator.next();
226 final boolean isConnected = subscriber.isConnected();
228 subscriber.sendDataMessage(data);
229 LOG.debug("Data was sent to subscriber {} on connection {}:", this, subscriber);
231 // removal is probably not necessary, because it will be removed explicitly soon after invocation of
232 // onWebSocketClosed(..) in handler; but just to be sure ...
234 LOG.debug("Subscriber for {} was removed - web-socket session is not open.", this);
239 @SuppressWarnings("checkstyle:IllegalCatch")
240 final boolean checkStartStop(final Instant now) {
242 if (start.compareTo(now) < 0 && stop.compareTo(now) > 0) {
245 if (stop.compareTo(now) < 0) {
248 } catch (final Exception e) {
249 throw new RestconfDocumentedException("Problem with unregister listener." + e);
252 } else if (start != null) {
253 if (start.compareTo(now) < 0) {
264 public final String toString() {
265 return addToStringAttributes(MoreObjects.toStringHelper(this)).toString();
268 ToStringHelper addToStringAttributes(final ToStringHelper helper) {
269 return helper.add("stream-name", streamName).add("output-type", getOutputType());
273 * Parse input of query parameters - start-time or stop-time - from {@link DateAndTime} format
274 * to {@link Instant} format.
276 * @param dateAndTime Start-time or stop-time as {@link DateAndTime} object.
277 * @return Parsed {@link Instant} by entry.
279 private static @NonNull Instant parseDateAndTime(final DateAndTime dateAndTime) {
280 final TemporalAccessor accessor;
282 accessor = FORMATTER.parse(dateAndTime.getValue());
283 } catch (final DateTimeParseException e) {
284 throw new RestconfDocumentedException("Cannot parse of value in date: " + dateAndTime, e);
286 return Instant.from(accessor);