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

Constructors

Constructor and Description
TimeUUIDUtils()

Method Summary

Methods

Modifier and Type	Method and Description
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