io.shardingsphere.core.keygen

类 DefaultKeyGenerator

java.lang.Object

io.shardingsphere.core.keygen.DefaultKeyGenerator

所有已实现的接口:

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(ShardingSphere distributed primary key published data) to now.
 10bits worker process id.
 12bits auto increment offset in one mills
 

Call @DefaultKeyGenerator.setWorkerId to set worker id, default value is 0.

Call @DefaultKeyGenerator.setMaxTolerateTimeDifferenceMilliseconds to set max tolerate time difference milliseconds, default value is 0.

作者:

gaohongtao

字段概要

字段

限定符和类型	字段和说明
static long	EPOCH

构造器概要

构造器

构造器和说明
DefaultKeyGenerator()

方法概要

限定符和类型	方法和说明
Number	generateKey() Generate key.
static void	setMaxTolerateTimeDifferenceMilliseconds(int maxTolerateTimeDifferenceMilliseconds) Set max tolerate time difference milliseconds.
static void	setWorkerId(long workerId) Set work process id.

从类继承的方法 java.lang.Object

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

字段详细资料

EPOCH

public static final long EPOCH

构造器详细资料

DefaultKeyGenerator

public DefaultKeyGenerator()

方法详细资料

setWorkerId

public static void setWorkerId(long workerId)

Set work process id.

参数:

workerId - work process id

setMaxTolerateTimeDifferenceMilliseconds

public static void setMaxTolerateTimeDifferenceMilliseconds(int maxTolerateTimeDifferenceMilliseconds)

Set max tolerate time difference milliseconds.

参数:

maxTolerateTimeDifferenceMilliseconds - max tolerate time difference milliseconds

generateKey

public Number generateKey()

Generate key.

指定者:

generateKey 在接口中 KeyGenerator

返回:

key type is @Long.