net.i2p.router

Class RouterClock

java.lang.Object

net.i2p.util.Clock

net.i2p.router.RouterClock

All Implemented Interfaces:

net.i2p.time.Timestamper.UpdateListener

public class RouterClock
extends net.i2p.util.Clock

Alternate location for determining the time which takes into account an offset. This offset will ideally be periodically updated so as to serve as the difference between the local computer's current time and the time as known by some reference (such as an NTP synchronized clock). RouterClock is a subclass of Clock with access to router transports. Configuration permitting, it will block clock offset changes which would increase peer clock skew.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	RouterClock.ClockShiftListener

Nested classes/interfaces inherited from class net.i2p.util.Clock

net.i2p.util.Clock.ClockUpdateListener

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_STRATUM

Fields inherited from class net.i2p.util.Clock

_alreadyChanged, _context, _isSystemClockBad, _offset, _startedOn, _statCreated, MAX_LIVE_OFFSET, MAX_OFFSET, MIN_OFFSET_CHANGE

Constructor Summary

Constructors

Constructor and Description
RouterClock(RouterContext context) Does not start.

Method Summary

Modifier and Type	Method and Description
void	addShiftListener(RouterClock.ClockShiftListener lsnr)
long	getDeltaOffset() Deprecated.
net.i2p.time.Timestamper	getTimestamper() The RouterTimestamper
long	now() Retrieve the current time synchronized with whatever reference clock is in use.
void	removeShiftListener(RouterClock.ClockShiftListener lsnr)
void	setNow(long realTime, int stratum)
void	setOffset(long offsetMs, boolean force) Specify how far away from the "correct" time the computer is - a positive value means that the system time is slow, while a negative value means the system time is fast.
void	start() Cannot be stopped, but RouterTimestamper registers a shutdown task.

Methods inherited from class net.i2p.util.Clock

addUpdateListener, fireOffsetChanged, getInstance, getLog, getOffset, getUpdatedSuccessfully, removeUpdateListener, setNow, setOffset

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_STRATUM

public static final int DEFAULT_STRATUM

See Also:

Constant Field Values

Constructor Detail

RouterClock

public RouterClock(RouterContext context)

Does not start. Caller MUST call start()

Method Detail

start

public void start()

Cannot be stopped, but RouterTimestamper registers a shutdown task.

Since:

0.9.20

getTimestamper

public net.i2p.time.Timestamper getTimestamper()

The RouterTimestamper

Overrides:

getTimestamper in class net.i2p.util.Clock

setOffset

public void setOffset(long offsetMs,
                      boolean force)

Specify how far away from the "correct" time the computer is - a positive value means that the system time is slow, while a negative value means the system time is fast.

Overrides:

setOffset in class net.i2p.util.Clock

Parameters:

offsetMs - the delta from System.currentTimeMillis() (NOT the delta from now())

setNow

public void setNow(long realTime,
                   int stratum)

Specified by:

setNow in interface net.i2p.time.Timestamper.UpdateListener

Overrides:

setNow in class net.i2p.util.Clock

Parameters:

stratum - used to determine whether we should ignore

Since:

0.7.12

now

public long now()

Retrieve the current time synchronized with whatever reference clock is in use. Do really simple clock slewing, like NTP but without jitter prevention. Slew the clock toward the desired offset, but only up to a maximum slew rate, and never let the clock go backwards because of slewing. Take care to only access the volatile variables once for speed and to avoid having another thread change them This is called about a zillion times a second, so we can do the slewing right here rather than in some separate thread to keep it simple. Avoiding backwards clocks when updating in a thread would be hard too.

Overrides:

now in class net.i2p.util.Clock

addShiftListener

public void addShiftListener(RouterClock.ClockShiftListener lsnr)

removeShiftListener

public void removeShiftListener(RouterClock.ClockShiftListener lsnr)

getDeltaOffset

@Deprecated
public long getDeltaOffset()

Deprecated.