com.netflix.astyanax.util
Class TimeUUIDUtils

java.lang.Object
  com.netflix.astyanax.util.TimeUUIDUtils

public final class TimeUUIDUtils
extends java.lang.Object

Utilitary class to generate TimeUUID (type 1)

Constructor Summary

TimeUUIDUtils()

Method Summary

static byte[]	asByteArray(java.util.UUID uuid) As byte array.
static java.nio.ByteBuffer	asByteBuffer(java.util.UUID uuid) Coverts a java.util.UUID into a ByteBuffer.
static long	getMicrosTimeFromUUID(java.util.UUID uuid)
static java.util.UUID	getMicrosTimeUUID(long time)
static long	getTimeFromUUID(byte[] uuid) Retrieves the time as long based on the byte[] representation of a UUID.
static long	getTimeFromUUID(java.util.UUID uuid)
static java.util.UUID	getTimeUUID(Clock clock) Gets a new time uuid using ClockResolution#createClock() as a time generator.
static java.util.UUID	getTimeUUID(long time) Gets a new time uuid based on time.
static java.util.UUID	getUniqueTimeUUIDinMicros()
static java.util.UUID	getUniqueTimeUUIDinMillis() Gets a new and unique time uuid in milliseconds.
static java.util.UUID	toUUID(byte[] uuid) Returns an instance of uuid.
static java.util.UUID	uuid(byte[] uuid, int offset)
static java.util.UUID	uuid(java.nio.ByteBuffer bb) Converts a ByteBuffer containing a UUID into a java.util.UUID

Methods inherited from class java.lang.Object

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

Constructor Detail

TimeUUIDUtils

public TimeUUIDUtils()

Method Detail

getUniqueTimeUUIDinMillis

public static java.util.UUID getUniqueTimeUUIDinMillis()

Gets a new and unique time uuid in milliseconds. It is useful to use in a TimeUUIDType sorted column family.

Returns:

the time uuid

getUniqueTimeUUIDinMicros

public static java.util.UUID getUniqueTimeUUIDinMicros()

getTimeUUID

public static java.util.UUID getTimeUUID(Clock clock)

Gets a new time uuid using ClockResolution#createClock() as a time generator. It is useful to use in a TimeUUIDType sorted column family.

Parameters:

clock - a ClockResolution

Returns:

the time uuid

getTimeUUID

public static java.util.UUID getTimeUUID(long time)

Gets a new time uuid based on time. NOTE: this algorithm does not resolve duplicates. To avoid duplicates use getTimeUUID(ClockResolution clock) with an implementaion that provides unique timestamp resolution, like MicrosecondsSyncClockResolution It is useful to use in a TimeUUIDType sorted column family.

Parameters:

clock - a ClockResolution

Returns:

the time uuid

getMicrosTimeUUID

public static java.util.UUID getMicrosTimeUUID(long time)

toUUID

public static java.util.UUID toUUID(byte[] uuid)

Returns an instance of uuid. Useful for when you read out of cassandra you are getting a byte[] that needs to be converted into a TimeUUID.

Parameters:

uuid - the uuid

Returns:

the java.util.uuid

getTimeFromUUID

public static long getTimeFromUUID(byte[] uuid)

Retrieves the time as long based on the byte[] representation of a UUID.

Parameters:

uuid - byte[] uuid representation

Returns:

a long representing the time

getTimeFromUUID

public static long getTimeFromUUID(java.util.UUID uuid)

getMicrosTimeFromUUID

public static long getMicrosTimeFromUUID(java.util.UUID uuid)

asByteArray

public static byte[] asByteArray(java.util.UUID uuid)

As byte array. This method is often used in conjunction with @link #getTimeUUID()

Parameters:

uuid - the uuid

Returns:

the byte[]

asByteBuffer

public static java.nio.ByteBuffer asByteBuffer(java.util.UUID uuid)

Coverts a java.util.UUID into a ByteBuffer.

Parameters:

uuid - a java.util.UUID

Returns:

a ByteBuffer representaion of the param UUID

uuid

public static java.util.UUID uuid(byte[] uuid,
                                  int offset)

uuid

public static java.util.UUID uuid(java.nio.ByteBuffer bb)

Converts a ByteBuffer containing a UUID into a java.util.UUID

Parameters:

bb - a ByteBuffer containing a UUID

Returns:

a java.util.UUID