ej.net.util

Class NtpUtil

java.lang.Object

ej.net.util.NtpUtil

public class NtpUtil
extends Object

Utilities to update the local time using NTP.

Field Summary

Fields

Modifier and Type	Field and Description
static String	NTP_ATTEMPTS_PROPERTY Property to set the NTP attempts.
static int	NTP_DEFAULT_ATTEMPTS Default NTP attempts.
static int	NTP_DEFAULT_GUARD_TIME Default NTP guard time.
static int	NTP_DEFAULT_PORT Default NTP port.
static String	NTP_DEFAULT_SERVER Default NTP URL.
static int	NTP_DEFAULT_TIMEOUT Default NTP timeout.
static String	NTP_GUARD_TIME_PROPERTY Property to set the NTP guard time.
static String	NTP_PORT_PROPERTY Property to set the NTP port.
static String	NTP_TIMEOUT_PROPERTY Property to set the NTP timeout.
static String	NTP_URL_PROPERTY Property to set the NTP URL.

Method Summary

Modifier and Type	Method and Description
static void	updateLocalTime() Updates the local time.
static void	updateLocalTime(String url, int port, int timeout) Updates the local time.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NTP_ATTEMPTS_PROPERTY

public static final String NTP_ATTEMPTS_PROPERTY

Property to set the NTP attempts.

See Also:

Constant Field Values

NTP_DEFAULT_ATTEMPTS

public static final int NTP_DEFAULT_ATTEMPTS

Default NTP attempts.

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Constant Field Values

NTP_DEFAULT_GUARD_TIME

public static final int NTP_DEFAULT_GUARD_TIME

Default NTP guard time.

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Constant Field Values

NTP_DEFAULT_PORT

public static final int NTP_DEFAULT_PORT

Default NTP port.

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Constant Field Values

NTP_DEFAULT_SERVER

public static final String NTP_DEFAULT_SERVER

Default NTP URL.

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Constant Field Values

NTP_DEFAULT_TIMEOUT

public static final int NTP_DEFAULT_TIMEOUT

Default NTP timeout.

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Constant Field Values

NTP_GUARD_TIME_PROPERTY

public static final String NTP_GUARD_TIME_PROPERTY

Property to set the NTP guard time.

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Constant Field Values

NTP_PORT_PROPERTY

public static final String NTP_PORT_PROPERTY

Property to set the NTP port.

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Constant Field Values

NTP_TIMEOUT_PROPERTY

public static final String NTP_TIMEOUT_PROPERTY

Property to set the NTP timeout.

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Constant Field Values

NTP_URL_PROPERTY

public static final String NTP_URL_PROPERTY

Property to set the NTP URL.

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Constant Field Values

Method Detail

updateLocalTime

public static void updateLocalTime()
                            throws IOException

Updates the local time. It uses the properties "ntp.url", "ntp.port" and "ntp.timeout" to parameterize the NTP requests. The default values are "0.pool.ntp.org":123 with a timeout 1000.

Throws:

IOException - if an error occurred.

updateLocalTime

public static void updateLocalTime(String url,
                                   int port,
                                   int timeout)
                            throws IOException

Updates the local time.

When this method returns, the application time is updated.

Parameters:

url - the NTP server URL.

port - the NTP server port.

timeout - the timeout for one NTP request.

Throws:

IOException - if an error occurred.

See Also:

Util.currentTimeMillis()