com.fasterxml.uuid.impl

Class TimeBasedEpochGenerator

java.lang.Object

com.fasterxml.uuid.UUIDGenerator

com.fasterxml.uuid.NoArgGenerator

com.fasterxml.uuid.impl.TimeBasedEpochGenerator

public class TimeBasedEpochGenerator
extends NoArgGenerator

Implementation of UUID generator that uses time/location based generation method field from the Unix Epoch timestamp source - the number of milliseconds seconds since midnight 1 Jan 1970 UTC, leap seconds excluded. This is usually referred to as "Version 7".

As all JUG provided implementations, this generator is fully thread-safe. Additionally it can also be made externally synchronized with other instances (even ones running on other JVMs); to do this, use FileBasedTimestampSynchronizer (or equivalent).

Since:

4.1

Field Summary

Fields

Modifier and Type	Field and Description
protected Random	_random Random number generator that this generator uses.

Constructor Summary

Constructors

Constructor and Description
TimeBasedEpochGenerator(Random rnd)

Method Summary

Modifier and Type	Method and Description
protected static long	_toLong(byte[] buffer, int offset)
UUID	generate()
UUIDType	getType() Accessor for determining type of UUIDs (version) that this generator instance will produce.

Methods inherited from class java.lang.Object

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

Field Detail

_random

protected final Random _random

Random number generator that this generator uses.

Constructor Detail

TimeBasedEpochGenerator

public TimeBasedEpochGenerator(Random rnd)

Parameters:

rnd - Random number generator to use for generating UUIDs; if null, shared default generator is used. Note that it is strongly recommend to use a good (pseudo) random number generator; for example, JDK's SecureRandom.

Method Detail

getType

public UUIDType getType()

Description copied from class: UUIDGenerator

Accessor for determining type of UUIDs (version) that this generator instance will produce.

Specified by:

getType in class UUIDGenerator

generate

public UUID generate()

Specified by:

generate in class NoArgGenerator

_toLong

protected static final long _toLong(byte[] buffer,
                                    int offset)