quamj.qps.util.ntp
Class NtpInfo

java.lang.Object
  |
  +--quamj.qps.util.ntp.NtpInfo

public class NtpInfo

extends java.lang.Object

This class represents a datastructure describing the useful information that can be extracted from a NtpDatagram returning from the server. Refer to rfc2030 for more details.

Field Summary

int	leapYearIndicator Leap year indicator.
static byte	LI_ALARM_CONDITION Alarm condition (clock not synchrinized)
static byte	LI_NEGATIVE_LEAP_SECOND Last minute has 59 seconds.
static byte	LI_NO_WARNING No leap second warning.
static byte	LI_POSITIVE_LEAP_SECOND Last minute has 61 seconds.
int	mode Mode of the communication with the server.
static byte	MODE_BROADCAST Broadcast mode.
static byte	MODE_CLIENT Client mode.
static byte	MODE_RESERVED Reserved mode.
static byte	MODE_RESERVED_FOR_NTP_CONTROL Reserved for NTP control message.
static byte	MODE_RESERVED_FOR_PRIVATE_USE Reserved for private use.
static byte	MODE_RESERVED_PASSIVE Symmetric passive mode.
static byte	MODE_SERVER Server mode.
static byte	MODE_SYMMETRIC_ACTIVE Symmetric active mode.
long	offset Offset of the local clock versus the server clock, taking into account the roundtrip delay (in milliseconds).
int	pollInterval Poll Interval in seconds.
double	precision Precision of the server clock (in milliseconds).
java.lang.Object	referenceIdentifier Reference Identifier.
TimeStamp	referenceTimeStamp Reference timestamp.
double	rootDelay Total roundtrip delay from the server to the primary server (in milliseconds).
double	rootDispersion Nominal error error relative to the primary reference source (in milliseconds).
long	roundTripDelay Roundtrip delay (in milliseconds).
java.net.InetAddress	serverAddress InetAddress of the server.
int	stratum The stratum.
static byte	STRATUM_PRIMARY_REFERENCE Primary reference.
static byte	STRATUM_UNSPECIFIED Unspecified or unavailable stratum.
int	versionNumber Version number of the packet.

Constructor Summary

NtpInfo()

Method Summary

java.lang.String

toString()

Methods inherited from class java.lang.Object

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

Field Detail

LI_NO_WARNING

public static final byte LI_NO_WARNING

No leap second warning.

See Also:

Constant Field Values

LI_POSITIVE_LEAP_SECOND

public static final byte LI_POSITIVE_LEAP_SECOND

Last minute has 61 seconds.

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Constant Field Values

LI_NEGATIVE_LEAP_SECOND

public static final byte LI_NEGATIVE_LEAP_SECOND

Last minute has 59 seconds.

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Constant Field Values

LI_ALARM_CONDITION

public static final byte LI_ALARM_CONDITION

Alarm condition (clock not synchrinized)

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Constant Field Values

MODE_RESERVED

public static final byte MODE_RESERVED

Reserved mode.

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Constant Field Values

MODE_SYMMETRIC_ACTIVE

public static final byte MODE_SYMMETRIC_ACTIVE

Symmetric active mode.

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Constant Field Values

MODE_RESERVED_PASSIVE

public static final byte MODE_RESERVED_PASSIVE

Symmetric passive mode.

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Constant Field Values

MODE_CLIENT

public static final byte MODE_CLIENT

Client mode.

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Constant Field Values

MODE_SERVER

public static final byte MODE_SERVER

Server mode.

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Constant Field Values

MODE_BROADCAST

public static final byte MODE_BROADCAST

Broadcast mode.

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Constant Field Values

MODE_RESERVED_FOR_NTP_CONTROL

public static final byte MODE_RESERVED_FOR_NTP_CONTROL

Reserved for NTP control message.

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Constant Field Values

MODE_RESERVED_FOR_PRIVATE_USE

public static final byte MODE_RESERVED_FOR_PRIVATE_USE

Reserved for private use.

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Constant Field Values

STRATUM_UNSPECIFIED

public static final byte STRATUM_UNSPECIFIED

Unspecified or unavailable stratum.

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Constant Field Values

STRATUM_PRIMARY_REFERENCE

public static final byte STRATUM_PRIMARY_REFERENCE

Primary reference.

See Also:

Constant Field Values

serverAddress

public java.net.InetAddress serverAddress

InetAddress of the server.

leapYearIndicator

public int leapYearIndicator

Leap year indicator.

versionNumber

public int versionNumber

Version number of the packet. In this application we always send version 3 packet to the server. The servers always seem to reply with version 3 packets (and not version 4).

mode

public int mode

Mode of the communication with the server. In our application this is MODE_CLIENT for the client and MODE_SERVER for the server.

stratum

public int stratum

The stratum. This number indicates the distance (in hops) from the server to the primary server (which is stratum 1).

pollInterval

public int pollInterval

Poll Interval in seconds. See rfc2030

precision

public double precision

Precision of the server clock (in milliseconds).

rootDelay

public double rootDelay

Total roundtrip delay from the server to the primary server (in milliseconds).

rootDispersion

public double rootDispersion

Nominal error error relative to the primary reference source (in milliseconds).

referenceIdentifier

public java.lang.Object referenceIdentifier

Reference Identifier.

• In the case of NTP Version 3 or Version 4 stratum-0 (unspecified) or stratum-1 (primary) servers, this is a String identifying the source.
• In NTP Version 3 secondary servers, this is the InetAddress of the reference source.
• In NTP Version 4 secondary servers this is a 4-byte array. See rfc2030.

referenceTimeStamp

public TimeStamp referenceTimeStamp

Reference timestamp. Indicates when the server clock was last set.

roundTripDelay

public long roundTripDelay

Roundtrip delay (in milliseconds). Calculated according to rfc2030.

offset

public long offset

Offset of the local clock versus the server clock, taking into account the roundtrip delay (in milliseconds). Calculated according to rfc2030.

Constructor Detail

NtpInfo

public NtpInfo()

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object