2 * Copyright (c) 2015 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.notifications;
10 import static java.util.Objects.requireNonNull;
12 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
13 import java.text.ParsePosition;
14 import java.time.Instant;
15 import java.time.LocalDateTime;
16 import java.time.OffsetDateTime;
17 import java.time.ZoneOffset;
18 import java.time.ZonedDateTime;
19 import java.time.format.DateTimeFormatter;
20 import java.time.format.DateTimeParseException;
21 import java.time.temporal.ChronoField;
22 import java.time.temporal.TemporalAccessor;
23 import java.util.Date;
24 import java.util.function.Function;
25 import org.opendaylight.netconf.api.NetconfMessage;
26 import org.slf4j.Logger;
27 import org.slf4j.LoggerFactory;
28 import org.w3c.dom.Document;
29 import org.w3c.dom.Element;
32 * Special kind of netconf message that contains a timestamp.
34 public final class NetconfNotification extends NetconfMessage {
36 private static final Logger LOG = LoggerFactory.getLogger(NetconfNotification.class);
38 public static final String NOTIFICATION = "notification";
39 public static final String NOTIFICATION_NAMESPACE = "urn:ietf:params:netconf:capability:notification:1.0";
42 * The ISO-like date-time formatter that formats or parses a date-time with
43 * the offset and zone if available, such as '2011-12-03T10:15:30',
44 * '2011-12-03T10:15:30+01:00' or '2011-12-03T10:15:30+01:00[Europe/Paris]'.
46 private static final DateTimeFormatter DATE_TIME_FORMATTER = DateTimeFormatter.ISO_DATE_TIME;
49 * Provide a {@link String} representation of a {@link Date} object,
50 * using the time-zone offset for UTC, {@code ZoneOffset.UTC}.
52 public static final Function<Date, String> RFC3339_DATE_FORMATTER = date ->
53 DATE_TIME_FORMATTER.format(date.toInstant().atOffset(ZoneOffset.UTC));
56 * Parse a {@link String} object into a {@link Date} using the time-zone
57 * offset for UTC, {@code ZoneOffset.UTC}, and the system default time-zone,
58 * {@code ZoneId.systemDefault()}.
60 * While parsing, if an exception occurs, we try to handle it as if it is due
61 * to a leap second. If that's the case, a simple conversion is applied, replacing
62 * the second-of-minute of 60 with 59.
63 * If that's not the case, we propagate the {@link DateTimeParseException} to the
67 public static final Function<String, Date> RFC3339_DATE_PARSER = time -> {
69 final ZonedDateTime localDateTime = ZonedDateTime.parse(time, DATE_TIME_FORMATTER);
70 final int startAt = 0;
71 final TemporalAccessor parsed = DATE_TIME_FORMATTER.parse(time, new ParsePosition(startAt));
72 final int nanoOfSecond = getFieldFromTemporalAccessor(parsed, ChronoField.NANO_OF_SECOND);
73 final long reminder = nanoOfSecond % 1000000;
75 // Log warn in case we rounded the fraction of a second. We need to create a string from the
76 // value that was cut. Example -> 1.123750 -> Value that was cut 75
78 final StringBuilder reminderBuilder = new StringBuilder(String.valueOf(reminder));
80 //add zeros in case we have number like 123056 to make sure 056 is displayed
81 while (reminderBuilder.length() < 6) {
82 reminderBuilder.insert(0, '0');
85 //delete zeros from end to make sure that number like 1.123750 will show value cut 75.
86 while (reminderBuilder.charAt(reminderBuilder.length() - 1) == '0') {
87 reminderBuilder.deleteCharAt(reminderBuilder.length() - 1);
89 LOG.warn("Fraction of second is cut to three digits. Value that was cut {}",
90 reminderBuilder.toString());
93 return Date.from(Instant.from(localDateTime));
94 } catch (DateTimeParseException exception) {
95 Date res = handlePotentialLeapSecond(time);
104 * Check whether the input {@link String} is representing a time compliant with the ISO
105 * format and having a leap second; e.g. formatted as 23:59:60. If that's the case, a simple
106 * conversion is applied, replacing the second-of-minute of 60 with 59.
108 * @param time {@link String} representation of a time
109 * @return {@code null} if time isn't ISO compliant or if the time doesn't have a leap second
110 * else a {@link Date} as per as the RFC3339_DATE_PARSER.
112 private static Date handlePotentialLeapSecond(final String time) {
113 // Parse the string from offset 0, so we get the whole value.
114 final int offset = 0;
115 final TemporalAccessor parsed = DATE_TIME_FORMATTER.parseUnresolved(time, new ParsePosition(offset));
117 if (parsed == null) {
121 int secondOfMinute = getFieldFromTemporalAccessor(parsed, ChronoField.SECOND_OF_MINUTE);
122 final int hourOfDay = getFieldFromTemporalAccessor(parsed, ChronoField.HOUR_OF_DAY);
123 final int minuteOfHour = getFieldFromTemporalAccessor(parsed, ChronoField.MINUTE_OF_HOUR);
125 // Check whether the input time has leap second. As the leap second can only
126 // occur at 23:59:60, we can be very strict, and don't interpret an incorrect
127 // value as leap second.
128 if (secondOfMinute != 60 || minuteOfHour != 59 || hourOfDay != 23) {
132 LOG.trace("Received time contains leap second, adjusting by replacing the second-of-minute of 60 with 59 {}",
135 // Applying simple conversion replacing the second-of-minute of 60 with 59.
139 final int year = getFieldFromTemporalAccessor(parsed, ChronoField.YEAR);
140 final int monthOfYear = getFieldFromTemporalAccessor(parsed, ChronoField.MONTH_OF_YEAR);
141 final int dayOfMonth = getFieldFromTemporalAccessor(parsed, ChronoField.DAY_OF_MONTH);
142 final int nanoOfSecond = getFieldFromTemporalAccessor(parsed, ChronoField.NANO_OF_SECOND);
143 final int offsetSeconds = getFieldFromTemporalAccessor(parsed, ChronoField.OFFSET_SECONDS);
145 final LocalDateTime currentTime = LocalDateTime.of(year, monthOfYear, dayOfMonth, hourOfDay, minuteOfHour,
146 secondOfMinute, nanoOfSecond);
147 final OffsetDateTime dateTimeWithZoneOffset = currentTime.atOffset(ZoneOffset.ofTotalSeconds(offsetSeconds));
149 return RFC3339_DATE_PARSER.apply(dateTimeWithZoneOffset.toString());
153 * Get value asociated with {@code ChronoField}.
155 * @param accessor The {@link TemporalAccessor}
156 * @param field The {@link ChronoField} to get
157 * @return the value associated with the {@link ChronoField} for the given {@link TemporalAccessor} if present,
160 private static int getFieldFromTemporalAccessor(final TemporalAccessor accessor, final ChronoField field) {
161 return accessor.isSupported(field) ? (int) accessor.getLong(field) : 0;
164 public static final String EVENT_TIME = "eventTime";
167 * Used for unknown/un-parse-able event-times.
169 public static final Date UNKNOWN_EVENT_TIME = new Date(0);
171 private final Date eventTime;
174 * Create new notification and capture the timestamp in the constructor.
176 public NetconfNotification(final Document notificationContent) {
177 this(notificationContent, new Date());
181 * Create new notification with provided timestamp.
183 @SuppressFBWarnings("EI_EXPOSE_REP2") // stores a reference to an externally mutable Date object
184 public NetconfNotification(final Document notificationContent, final Date eventTime) {
185 super(wrapNotification(notificationContent, eventTime));
186 this.eventTime = eventTime;
190 * Get the time of the event.
192 * @return notification event time
194 @SuppressFBWarnings("EI_EXPOSE_REP")
195 public Date getEventTime() {
199 private static Document wrapNotification(final Document notificationContent, final Date eventTime) {
200 requireNonNull(notificationContent);
201 requireNonNull(eventTime);
203 final Element baseNotification = notificationContent.getDocumentElement();
204 final Element entireNotification = notificationContent.createElementNS(NOTIFICATION_NAMESPACE, NOTIFICATION);
205 entireNotification.appendChild(baseNotification);
207 final Element eventTimeElement = notificationContent.createElementNS(NOTIFICATION_NAMESPACE, EVENT_TIME);
208 eventTimeElement.setTextContent(getSerializedEventTime(eventTime));
209 entireNotification.appendChild(eventTimeElement);
211 notificationContent.appendChild(entireNotification);
212 return notificationContent;
215 private static String getSerializedEventTime(final Date eventTime) {
216 return RFC3339_DATE_FORMATTER.apply(eventTime);