com.github.f4b6a3.uuid.util

Class TimestampUtil

java.lang.Object

com.github.f4b6a3.uuid.util.TimestampUtil

public class TimestampUtil
extends Object

Class that provides methods related to timestamps. All its public methods have milliseconds precision.

Field Summary

Fields

Modifier and Type	Field and Description
static long	GREGORIAN_MILLISECONDS
static long	MILLISECONDS_PER_SECOND
static long	TIMESTAMP_RESOLUTION

Constructor Summary

Constructors

Constructor and Description
TimestampUtil()

Method Summary

Modifier and Type	Method and Description
static long	getCurrentTimestamp() Get the current timestamp with milliseconds precision.
static Instant	toInstant(long timestamp) Get the instant of the given timestamp with milliseconds precision.
static long	toTimestamp(Instant instant) Get the timestamp of a given instant with milliseconds precision.

Methods inherited from class java.lang.Object

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

Field Detail

GREGORIAN_MILLISECONDS

public static final long GREGORIAN_MILLISECONDS

MILLISECONDS_PER_SECOND

public static final long MILLISECONDS_PER_SECOND

See Also:

Constant Field Values

TIMESTAMP_RESOLUTION

public static final long TIMESTAMP_RESOLUTION

See Also:

Constant Field Values

Constructor Detail

TimestampUtil

public TimestampUtil()

Method Detail

getCurrentTimestamp

public static long getCurrentTimestamp()

Get the current timestamp with milliseconds precision. The UUID timestamp is a number of 100-nanos since gregorian epoch. ### RFC-4122 - 4.2.1.2. System Clock Resolution The timestamp is generated from the system time, whose resolution may be less than the resolution of the UUID timestamp. If UUIDs do not need to be frequently generated, the timestamp can simply be the system time multiplied by the number of 100-nanosecond intervals per system time interval. (4) A high resolution timestamp can be simulated by keeping a count of the number of UUIDs that have been generated with the same value of the system time, and using it to construct the low order bits of the timestamp. The count will range between zero and the number of 100-nanosecond intervals per system time interval.

Returns:

the current timestamp

toTimestamp

public static long toTimestamp(Instant instant)

Get the timestamp of a given instant with milliseconds precision.

Parameters:

instant - an instant

Returns:

a timestamp

toInstant

public static Instant toInstant(long timestamp)

Get the instant of the given timestamp with milliseconds precision.

Parameters:

timestamp - a timestamp

Returns:

an instant