org.globus.cog.util.ntp
Class NTPClient

java.lang.Object
  org.globus.cog.util.ntp.NTPClient

public class NTPClient

extends Object

A simple NTPClient based on the RFC2030.

Constructor Summary

NTPClient(String NTPserver)
Creates a new NTPClient instance.

Method Summary

String	convertMode(int mode) Converts the mode as described in RFC2030.
long	getDelay() returns the delay between the remote server and the local time.
String	getMode() The mode as described in RFC2030.
String	getServer() Returns the NTP server name.
String	getType() Returns the type of the serevr.
long	getVariation() Describe getVariation method here.
void	update() queries the NTP serevr and calculates the time difference.
boolean	withinDelta(long delta) returns true if the timedelay is smaller than a specified value.

Methods inherited from class java.lang.Object

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

Constructor Detail

NTPClient

public NTPClient(String NTPserver)

Creates a new NTPClient instance.

Parameters:

NTPserver - is the name of an ntpserver such as time.nist.gov

Method Detail

getMode

public String getMode()

The mode as described in RFC2030.

Returns:

a String returning a readble form of the mode. Mode Meaning ------------------------------------ 0 reserved 1 symmetric active 2 symmetric passive 3 client 4 server 5 broadcast 6 reserved for NTP control message 7 reserved for private use

convertMode

public String convertMode(int mode)

Converts the mode as described in RFC2030.

Returns:

a String returning a readble form of the mode. Mode Meaning ------------------------------------ 0 reserved 1 symmetric active 2 symmetric passive 3 client 4 server 5 broadcast 6 reserved for NTP control message 7 reserved for private use

getServer

public String getServer()

Returns the NTP server name.

Returns:

a String with the server name

getType

public String getType()

Returns the type of the serevr.

Returns:

a String with the type

getDelay

public long getDelay()

returns the delay between the remote server and the local time.

Returns:

a long value representing the difference in milliseconds.

getVariation

public long getVariation()

Describe getVariation method here.

Returns:

a long value

withinDelta

public boolean withinDelta(long delta)

returns true if the timedelay is smaller than a specified value.

Parameters:

delta - a long value representing the interval

Returns:

a boolean value returns true if the time difference is smaller than delta

update

public void update()
            throws IOException

queries the NTP serevr and calculates the time difference.

Throws:

IOException