org.ros.time
Class NtpTimeProvider

java.lang.Object
  org.ros.time.NtpTimeProvider

All Implemented Interfaces:

TimeProvider

public class NtpTimeProvider
extends java.lang.Object
implements TimeProvider

Provides NTP synchronized wallclock (actual) time.

Constructor Summary

NtpTimeProvider(java.net.InetAddress host, java.util.concurrent.ScheduledExecutorService scheduledExecutorService)

Method Summary

Time	getCurrentTime()
void	startPeriodicUpdates(long period, java.util.concurrent.TimeUnit unit) Starts periodically updating the current time offset periodically.
void	stopPeriodicUpdates() Stops periodically updating the current time offset.
void	updateTime() Update the current time offset from the configured NTP host.

Methods inherited from class java.lang.Object

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

Constructor Detail

NtpTimeProvider

public NtpTimeProvider(java.net.InetAddress host,
                       java.util.concurrent.ScheduledExecutorService scheduledExecutorService)

Parameters:

host - the NTP host to use

Method Detail

updateTime

public void updateTime()
                throws java.io.IOException

Update the current time offset from the configured NTP host.

Throws:

java.io.IOException

startPeriodicUpdates

public void startPeriodicUpdates(long period,
                                 java.util.concurrent.TimeUnit unit)

Starts periodically updating the current time offset periodically.

The first time update happens immediately.

Note that errors thrown while periodically updating time will be logged but not rethrown.

Parameters:

period - time between updates

unit - unit of period

stopPeriodicUpdates

public void stopPeriodicUpdates()

Stops periodically updating the current time offset.

getCurrentTime

public Time getCurrentTime()

Specified by:

getCurrentTime in interface TimeProvider

Returns:

the current time of the system using rostime