net.i2p.router.time

Class NtpClient

java.lang.Object

net.i2p.router.time.NtpClient

public class NtpClient
extends Object

NtpClient - an NTP client for Java. This program connects to an NTP server and prints the response to the console. The local clock offset calculation is implemented according to the SNTP algorithm specified in RFC 2030. Note that on windows platforms, the curent time-of-day timestamp is limited to an resolution of 10ms and adversely affects the accuracy of the results. Public only for main(), not a public API, not for external use. 2036-compliant as of 0.9.50, see NtpMessage.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) static double	SECONDS_1900_TO_EPOCH difference between the unix epoch and jan 1 1900 (NTP uses that)

Constructor Summary

Constructors

Constructor and Description
NtpClient()

Method Summary

Modifier and Type	Method and Description
(package private) static long[]	currentTimeAndStratum(String[] serverNames, int perServerTimeout, boolean preferIPv6, Log log) Query the ntp servers, returning the current time from first one we find Hack to return time and stratum
static void	main(String[] args) Main entry point for the NtpClient program.

Methods inherited from class java.lang.Object

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

Field Detail

SECONDS_1900_TO_EPOCH

static final double SECONDS_1900_TO_EPOCH

difference between the unix epoch and jan 1 1900 (NTP uses that)

See Also:

Constant Field Values

Constructor Detail

NtpClient

public NtpClient()

Method Detail

currentTimeAndStratum

static long[] currentTimeAndStratum(String[] serverNames,
                                    int perServerTimeout,
                                    boolean preferIPv6,
                                    Log log)

Query the ntp servers, returning the current time from first one we find Hack to return time and stratum

Parameters:

log - may be null

Returns:

time in rv[0] and stratum in rv[1]

Throws:

IllegalArgumentException - if none of the servers are reachable

main

public static void main(String[] args)
                 throws IOException

Main entry point for the NtpClient program. Usage: java -jar i2p/lib/router.jar NtpClient [-6] [servers...] The optional "-6" flag forces IPv6 DNS lookups. If no servers are specified, the default "pool.ntp.org" is used. This program queries the specified NTP servers and prints the current time along with stratum and offset information.

Parameters:

args - command-line arguments; optionally "-6" followed by list of NTP servers

Throws:

IOException - if a network error occurs