org.apache.shardingsphere.sharding.algorithm.keygen

Class SnowflakeKeyGenerateAlgorithm

java.lang.Object

org.apache.shardingsphere.sharding.algorithm.keygen.SnowflakeKeyGenerateAlgorithm

All Implemented Interfaces:

org.apache.shardingsphere.infra.config.algorithm.ShardingSphereAlgorithm, org.apache.shardingsphere.infra.config.algorithm.ShardingSphereAlgorithmPostProcessor, org.apache.shardingsphere.infra.spi.typed.TypedSPI, KeyGenerateAlgorithm

public final class SnowflakeKeyGenerateAlgorithm
extends Object
implements KeyGenerateAlgorithm

Snowflake key generate algorithm.

     Length of key is 64 bit.
     1 bit sign bit.
     41 bits timestamp offset from 2016.11.01(ShardingSphere distributed primary key published data) to now.
     10 bits worker process id.
     12 bits auto increment offset in one mills
 

Field Summary

Fields

Modifier and Type	Field and Description
static long	EPOCH

Constructor Summary

Constructors

Constructor and Description
SnowflakeKeyGenerateAlgorithm()

Method Summary

Modifier and Type	Method and Description
Comparable<?>	generateKey()
String	getType()
void	init()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.shardingsphere.infra.spi.typed.TypedSPI

getProps, setProps

Field Detail

EPOCH

public static final long EPOCH

Constructor Detail

SnowflakeKeyGenerateAlgorithm

public SnowflakeKeyGenerateAlgorithm()

Method Detail

init

public void init()

Specified by:

init in interface org.apache.shardingsphere.infra.config.algorithm.ShardingSphereAlgorithmPostProcessor

generateKey

public Comparable<?> generateKey()

Specified by:

generateKey in interface KeyGenerateAlgorithm

getType

public String getType()

Specified by:

getType in interface org.apache.shardingsphere.infra.spi.typed.TypedSPI