Package 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.

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
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.
boolean	equals(Object obj)	Compares this object against the specified object.
InetAddress	getAddress()	Gets host address from message datagram if available
List<String>	getComments()	Return list of comments (if any) during processing of NTP packet.
Long	getDelay()	Gets round-trip network delay.
NtpV3Packet	getMessage()	Returns NTP message packet.
Long	getOffset()	Gets 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.
int	hashCode()	Computes a hash code for this object.

Methods inherited from class java.lang.Object

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

Constructor Details

TimeInfo

public TimeInfo(NtpV3Packet message,
 long returnTimeMillis)

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

Parameters:

message - NTP message packet

returnTimeMillis - destination receive time

Throws:

IllegalArgumentException - if message is null

TimeInfo

public TimeInfo(NtpV3Packet msgPacket,
 long returnTimeMillis,
 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 initialization when sub-millisecond timing is needed.

Parameters:

msgPacket - NTP message packet

returnTimeMillis - destination receive time

doComputeDetails - flag to pre-compute delay/offset values

Throws:

IllegalArgumentException - if message is null

TimeInfo

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

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

Parameters:

message - NTP message packet

returnTimeMillis - destination receive time

comments - List of errors/warnings identified during processing

Throws:

IllegalArgumentException - if message is null

TimeInfo

public TimeInfo(NtpV3Packet message,
 long returnTimeMillis,
 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 initialization when sub-millisecond timing is needed.

Parameters:

message - NTP message packet

returnTimeMillis - 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 Details

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 - the comment

computeDetails

public void computeDetails()

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

equals

public boolean equals(Object obj)

Compares this object against the specified object. The result is true if and only if the argument is not null and is a TimeStamp object that contains the same values as this object.

Overrides:

equals in class Object

Parameters:

obj - the object to compare with.

Returns:

true if the objects are the same; false otherwise.

Since:

3.4

getAddress

public InetAddress getAddress()

Gets host address from message datagram if available

Returns:

host address of available otherwise null

Since:

3.4

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()

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

Returns:

Long or null if delay not available.

getMessage

public NtpV3Packet getMessage()

Returns NTP message packet.

Returns:

NTP message packet.

getOffset

public Long getOffset()

Gets 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.

getReturnTime

public long getReturnTime()

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

Returns:

packet return time.

hashCode

public int hashCode()

Computes a hash code for this object. The result is the exclusive OR of the return time and the message hash code.

Overrides:

hashCode in class Object

Returns:

a hash code value for this object.

Since:

3.4