io.shardingsphere.core.keygen

Class DefaultKeyGenerator

java.lang.Object

io.shardingsphere.core.keygen.DefaultKeyGenerator

All Implemented Interfaces:

KeyGenerator

public final class DefaultKeyGenerator
extends Object
implements KeyGenerator

Default distributed primary key generator.

Use snowflake algorithm. Length is 64 bit.

 1bit   sign bit.
 41bits timestamp offset from 2016.11.01(Sharding-Sphere distributed primary key published data) to now.
 10bits worker process id.
 12bits auto increment offset in one mills
 

Call @DefaultKeyGenerator.setWorkerId to set.

Author:

gaohongtao

Field Summary

Fields

Modifier and Type	Field and Description
static long	EPOCH

Constructor Summary

Constructors

Constructor and Description
DefaultKeyGenerator()

Method Summary

Modifier and Type	Method and Description
Number	generateKey() Generate key.
static void	setWorkerId(long workerId) Set work process id.

Methods inherited from class java.lang.Object

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

Field Detail

EPOCH

public static final long EPOCH

Constructor Detail

DefaultKeyGenerator

public DefaultKeyGenerator()

Method Detail

setWorkerId

public static void setWorkerId(long workerId)

Set work process id.

Parameters:

workerId - work process id

generateKey

public Number generateKey()

Generate key.

Specified by:

generateKey in interface KeyGenerator

Returns:

key type is @Long.