Example usage for org.apache.commons.net.ntp NTPUDPClient isOpen

Introduction

In this page you can find the example usage for org.apache.commons.net.ntp NTPUDPClient isOpen.

Prototype

public boolean isOpen() 

Source Link

Document

Returns true if the client has a currently open socket.

Usage

From source file:com.clustercontrol.port.protocol.ReachAddressNTP.java

/**
 * NTP????????//from   w  w w  . j  a  v a2 s.co  m
 * 
 * @param addressText
 * @return NTP
 */
@Override
protected boolean isRunning(String addressText) {

    m_message = "";
    m_messageOrg = "";
    m_response = -1;

    boolean isReachable = false;

    try {
        long start = 0; // 
        long end = 0; // 
        boolean retry = true; // ????(true:??false:???)

        StringBuffer bufferOrg = new StringBuffer(); // 
        String result = "";

        InetAddress address = InetAddress.getByName(addressText);

        bufferOrg.append("Monitoring the NTP Service of " + address.getHostName() + "["
                + address.getHostAddress() + "]:" + m_portNo + ".\n\n");

        NTPUDPClient client = new NTPUDPClient();
        TimeInfo time = null;

        for (int i = 0; i < m_sentCount && retry; i++) {
            try {
                bufferOrg.append(HinemosTime.getDateString() + " Tried to Connect: ");
                client.setDefaultTimeout(m_timeout);

                start = HinemosTime.currentTimeMillis();
                time = client.getTime(address, m_portNo);
                end = HinemosTime.currentTimeMillis();

                m_response = end - start;

                if (time != null) {
                    if (m_response > 0) {
                        if (m_response < m_timeout) {
                            result = result + ("\n" + "Response Time = " + m_response + "ms");
                        } else {
                            m_response = m_timeout;
                            result = result + ("\n" + "Response Time = " + m_response + "ms");
                        }
                    } else {
                        result = result + ("\n" + "Response Time < 1ms");
                    }
                    result = new Date(time.getReturnTime()).toString();
                    retry = false;
                    isReachable = true;
                } else {
                    result = "failed to get time ";
                    retry = false;
                    isReachable = false;
                }

            } catch (SocketException e) {
                result = (e.getMessage() + "[SocketException]");
                retry = true;
                isReachable = false;
            } catch (IOException e) {
                result = (e.getMessage() + "[IOException]");
                retry = true;
                isReachable = false;
            } finally {
                bufferOrg.append(result + "\n");
                if (client.isOpen()) {
                    client.close();
                }
            }

            if (i < m_sentCount - 1 && retry) {
                try {
                    Thread.sleep(m_sentInterval);
                } catch (InterruptedException e) {
                    break;
                }
            }
        }

        m_message = result + "(NTP/" + m_portNo + ")";
        m_messageOrg = bufferOrg.toString();
        return isReachable;
    } catch (UnknownHostException e) {
        m_log.debug("isRunning(): " + MessageConstant.MESSAGE_FAIL_TO_EXECUTE_TO_CONNECT.getMessage()
                + e.getMessage());

        m_message = MessageConstant.MESSAGE_FAIL_TO_EXECUTE_TO_CONNECT.getMessage() + " (" + e.getMessage()
                + ")";

        return false;
    }
}

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