Examples with NTPUDPClient org.apache.commons.net.ntp.NTPUDPClient used on opensource projects

Example 1 with NTPUDPClient

use of org.apache.commons.net.ntp.NTPUDPClient in project openhab1-addons by openhab.

the class NtpBinding method getTime.

/**
     * Queries the given timeserver <code>hostname</code> and returns the time
     * in milliseconds.
     *
     * @param hostname the timeserver to query
     * @return the time in milliseconds or the current time of the system if an
     *         error occurs.
     */
protected static long getTime(String hostname) {
    try {
        NTPUDPClient timeClient = new NTPUDPClient();
        timeClient.setDefaultTimeout(NTP_TIMEOUT);
        InetAddress inetAddress = InetAddress.getByName(hostname);
        TimeInfo timeInfo = timeClient.getTime(inetAddress);
        return timeInfo.getReturnTime();
    } catch (UnknownHostException uhe) {
        logger.warn("the given hostname '{}' of the timeserver is unknown -> returning current sytem time instead", hostname);
    } catch (IOException ioe) {
        logger.warn("couldn't establish network connection [host '{}'] -> returning current sytem time instead", hostname);
    }
    return System.currentTimeMillis();
}

Example 2 with NTPUDPClient

use of org.apache.commons.net.ntp.NTPUDPClient in project incubator-rya by apache.

the class TimeUtils method getNtpServerDate.

/**
 * Queries the specified NTP Server for the time.
 * Do not query time server more than once every 4 seconds.
 * @param timeServerHost the time server host name.
 * @return the NTP server {@link Date} or {@code null}.
 * @throws IOException
 */
public static Date getNtpServerDate(final String timeServerHost) throws IOException {
    try {
        TimeInfo timeInfo = null;
        final NTPUDPClient timeClient = new NTPUDPClient();
        timeClient.setDefaultTimeout(NTP_SERVER_TIMEOUT_MS);
        final InetAddress inetAddress = InetAddress.getByName(timeServerHost);
        if (inetAddress != null) {
            timeInfo = timeClient.getTime(inetAddress);
            if (timeInfo != null) {
                // TODO: which time to use?
                final long serverTime = timeInfo.getMessage().getTransmitTimeStamp().getTime();
                // long serverTime = timeInfo.getReturnTime();
                final Date ntpDate = new Date(serverTime);
                return ntpDate;
            }
        }
    } catch (final IOException e) {
        throw new IOException("Unable to get NTP server time.", e);
    }
    return null;
}

Example 3 with NTPUDPClient

use of org.apache.commons.net.ntp.NTPUDPClient in project deeplearning4j by deeplearning4j.

the class NTPTimeSource method queryServerNow.

private void queryServerNow() {
    Long offsetResult = null;
    for (int i = 0; i < MAX_QUERY_RETRIES; i++) {
        try {
            NTPUDPClient client = new NTPUDPClient();
            // Timeout if a response takes longer than 10 seconds
            client.setDefaultTimeout(DEFAULT_NTP_TIMEOUT_MS);
            client.open();
            InetAddress address = InetAddress.getByName(ntpServer);
            TimeInfo info = client.getTime(address);
            info.computeDetails();
            Long offset = info.getOffset();
            if (offset == null) {
                throw new Exception("Could not calculate time offset (offset is null)");
            } else {
                offsetResult = offset;
                break;
            }
        } catch (Exception e) {
            log.error("Error querying NTP server, attempt {} of {}", (i + 1), MAX_QUERY_RETRIES, e);
        }
    }
    if (offsetResult == null) {
        log.error("Could not successfully query NTP server after " + MAX_QUERY_RETRIES + " tries");
        throw new RuntimeException("Could not successfully query NTP server after " + MAX_QUERY_RETRIES + " tries");
    }
    lastOffsetGetTimeSystemMS = System.currentTimeMillis();
    lastOffsetMilliseconds = offsetResult;
    log.debug("Updated local time offset based on NTP server result. Offset = {}", lastOffsetMilliseconds);
}

Example 4 with NTPUDPClient

use of org.apache.commons.net.ntp.NTPUDPClient in project incubator-rya by apache.

the class TimeUtils method getNtpServerDate.

/**
 * Queries the specified NTP Server for the time.
 * Do not query time server more than once every 4 seconds.
 * @param timeServerHost the time server host name.
 * @return the NTP server {@link Date} or {@code null}.
 * @throws IOException
 */
public static Date getNtpServerDate(final String timeServerHost) throws IOException {
    try {
        TimeInfo timeInfo = null;
        final NTPUDPClient timeClient = new NTPUDPClient();
        timeClient.setDefaultTimeout(NTP_SERVER_TIMEOUT_MS);
        final InetAddress inetAddress = InetAddress.getByName(timeServerHost);
        if (inetAddress != null) {
            timeInfo = timeClient.getTime(inetAddress);
            if (timeInfo != null) {
                // TODO: which time to use?
                final long serverTime = timeInfo.getMessage().getTransmitTimeStamp().getTime();
                // long serverTime = timeInfo.getReturnTime();
                final Date ntpDate = new Date(serverTime);
                return ntpDate;
            }
        }
    } catch (final IOException e) {
        throw new IOException("Unable to get NTP server time.", e);
    }
    return null;
}

Example 5 with NTPUDPClient

use of org.apache.commons.net.ntp.NTPUDPClient in project smarthome by eclipse.

the class NtpHandler method getTime.

/**
 * Queries the given timeserver <code>hostname</code> and returns the time
 * in milliseconds.
 *
 * @param hostname the timeserver to query
 * @return the time in milliseconds or the current time of the system if an
 *         error occurs.
 */
public long getTime(String hostname) {
    try {
        NTPUDPClient timeClient = new NTPUDPClient();
        timeClient.setDefaultTimeout(NTP_TIMEOUT);
        InetAddress inetAddress = InetAddress.getByName(hostname);
        TimeInfo timeInfo = timeClient.getTime(inetAddress, port.intValue());
        timeInfo.computeDetails();
        long serverMillis = timeInfo.getReturnTime() + timeInfo.getOffset();
        logger.debug("{} Got time update from host '{}': {}.", getThing().getUID(), hostname, SDF.format(new Date(serverMillis)));
        updateStatus(ThingStatus.ONLINE, ThingStatusDetail.NONE);
        return serverMillis;
    } catch (UnknownHostException uhe) {
        logger.debug("{} The given hostname '{}' of the timeserver is unknown -> returning current sytem time instead. ({})", getThing().getUID(), hostname, uhe.getMessage());
        updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "@text/offline.comm-error-unknown-host [\"" + (hostname == null ? "null" : hostname) + "\"]");
    } catch (IOException ioe) {
        logger.debug("{} Couldn't establish network connection to host '{}' -> returning current sytem time instead. ({})", getThing().getUID(), hostname, ioe.getMessage());
        updateStatus(ThingStatus.OFFLINE, ThingStatusDetail.COMMUNICATION_ERROR, "@text/offline.comm-error-connection [\"" + (hostname == null ? "null" : hostname) + "\"]");
    }
    return System.currentTimeMillis();
}