net.time4j.clock

Interface SntpConfiguration

All Superinterfaces:

NetTimeConfiguration

public interface SntpConfiguration
extends NetTimeConfiguration

Represents a configuration for a connection to a NTP-Server.

Implementations of this SPI-interface must be immutable or at least threadsafe. Instances can be created manually or via a ServiceLoader.

Since:

2.1

Author:

Meno Hochschild

See Also:

ServiceLoader

Specification:

Implementations must have a public constructor without any arguments.

Field Summary

Fields inherited from interface net.time4j.clock.NetTimeConfiguration

DEFAULT_CONNECTION_TIMEOUT

Method Summary

Modifier and Type	Method and Description
short	getRequestCount() Determines how often a SNTP-Client will send queries during a connection for the purpose of the calculation of an arithmetic mean value.
int	getRequestInterval() Determines the rate by which a SNTP-client sends queries during a connection for the purpose of the calculation of an arithmetic mean value.
boolean	isNTP4() Determines if NTP3 or NTP4 should be used.

Methods inherited from interface net.time4j.clock.NetTimeConfiguration

getClockShiftWindow, getConnectionTimeout, getTimeServerAddress, getTimeServerPort

Method Detail

isNTP4

boolean isNTP4()

Determines if NTP3 or NTP4 should be used.

Returns:

true if NTP4 shall be used else false

Since:

2.1

getRequestInterval

int getRequestInterval()

Determines the rate by which a SNTP-client sends queries during a connection for the purpose of the calculation of an arithmetic mean value.

Default value is 60 * 4 (that is 4 minutes). This method is only relevant if getRequestCount() yields at least the value 2. One single connection request can contain several queries this way. Note that some servers will block requests if they happen too often.

Returns:

time distance between two messages in seconds as positive number

Since:

2.1

getRequestCount

short getRequestCount()

Determines how often a SNTP-Client will send queries during a connection for the purpose of the calculation of an arithmetic mean value.

Default value is 1 (single query). The value 0 is also permitted and effectively stops any query. If any bigger value (> 1) is configured then an asynchronous connection to the NTP-server is recommended. One single connection request can contain several queries this way. Note that some servers will block requests if they happen too often.

Returns:

number in range 0 <= x < 1000

Since:

2.1

See Also:

NetTimeConnector.connect()