org.apache.commons.net.ntp
Class TimeInfo

java.lang.Object
  org.apache.commons.net.ntp.TimeInfo

public class TimeInfo
extends Object

Wrapper class to network time packet messages (NTP, etc) that computes related timing info and stats.

Version:

$Revision: 1299238 $

Author:

Jason Mathews, MITRE Corp

Constructor Summary

TimeInfo(NtpV3Packet message, long returnTime)
Create TimeInfo object with raw packet message and destination time received.

TimeInfo(NtpV3Packet msgPacket, long returnTime, boolean doComputeDetails)
Create TimeInfo object with raw packet message and destination time received.

TimeInfo(NtpV3Packet message, long returnTime, List<String> comments)
Create TimeInfo object with raw packet message and destination time received.

TimeInfo(NtpV3Packet message, long returnTime, List<String> comments, boolean doComputeDetails)
Create TimeInfo object with raw packet message and destination time received.

Method Summary

void	addComment(String comment) Add comment (error/warning) to list of comments associated with processing of NTP parameters.
void	computeDetails() Compute and validate details of the NTP message packet.
List<String>	getComments() Return list of comments (if any) during processing of NTP packet.
Long	getDelay() Get round-trip network delay.
NtpV3Packet	getMessage() Returns NTP message packet.
Long	getOffset() Get clock offset needed to adjust local clock to match remote clock.
long	getReturnTime() Returns time at which time message packet was received by local machine.

Methods inherited from class java.lang.Object

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

Constructor Detail

TimeInfo

public TimeInfo(NtpV3Packet message,
                long returnTime)

Create TimeInfo object with raw packet message and destination time received.

Parameters:

message - NTP message packet

returnTime - destination receive time

Throws:

IllegalArgumentException - if message is null

TimeInfo

public TimeInfo(NtpV3Packet message,
                long returnTime,
                List<String> comments)

Create TimeInfo object with raw packet message and destination time received.

Parameters:

message - NTP message packet

returnTime - destination receive time

comments - List of errors/warnings identified during processing

Throws:

IllegalArgumentException - if message is null

TimeInfo

public TimeInfo(NtpV3Packet msgPacket,
                long returnTime,
                boolean doComputeDetails)

Create TimeInfo object with raw packet message and destination time received. Auto-computes details if computeDetails flag set otherwise this is delayed until computeDetails() is called. Delayed computation is for fast intialization when sub-millisecond timing is needed.

Parameters:

msgPacket - NTP message packet

returnTime - destination receive time

doComputeDetails - flag to pre-compute delay/offset values

Throws:

IllegalArgumentException - if message is null

TimeInfo

public TimeInfo(NtpV3Packet message,
                long returnTime,
                List<String> comments,
                boolean doComputeDetails)

Create TimeInfo object with raw packet message and destination time received. Auto-computes details if computeDetails flag set otherwise this is delayed until computeDetails() is called. Delayed computation is for fast intialization when sub-millisecond timing is needed.

Parameters:

message - NTP message packet

returnTime - destination receive time

comments - list of comments used to store errors/warnings with message

doComputeDetails - flag to pre-compute delay/offset values

Throws:

IllegalArgumentException - if message is null

Method Detail

addComment

public void addComment(String comment)

Add comment (error/warning) to list of comments associated with processing of NTP parameters. If comment list not create then one will be created.

Parameters:

comment -

computeDetails

public void computeDetails()

Compute and validate details of the NTP message packet. Computed fields include the offset and delay.

getComments

public List<String> getComments()

Return list of comments (if any) during processing of NTP packet.

Returns:

List or null if not yet computed

getDelay

public Long getDelay()

Get round-trip network delay. If null then could not compute the delay.

Returns:

Long or null if delay not available.

getOffset

public Long getOffset()

Get clock offset needed to adjust local clock to match remote clock. If null then could not compute the offset.

Returns:

Long or null if offset not available.

getMessage

public NtpV3Packet getMessage()

Returns NTP message packet.

Returns:

NTP message packet.

getReturnTime

public long getReturnTime()

Returns time at which time message packet was received by local machine.

Returns:

packet return time.