com.baidu.fsg.uid.impl

类 DefaultUidGenerator

java.lang.Object

com.baidu.fsg.uid.impl.DefaultUidGenerator

所有已实现的接口:

UidGenerator, org.springframework.beans.factory.InitializingBean

直接已知子类:

CachedUidGenerator

public class DefaultUidGenerator
extends Object
implements UidGenerator, org.springframework.beans.factory.InitializingBean

Represents an implementation of UidGenerator

The unique id has 64bits (long), default allocated as blow:

sign: The highest bit is 0 delta seconds: The next 28 bits, represents delta seconds since a customer epoch(2016-05-20 00:00:00.000). Supports about 8.7 years until to 2024-11-20 21:24:16 worker id: The next 22 bits, represents the worker's id which assigns based on database, max id is about 420W sequence: The next 13 bits, represents a sequence within the same second, max for 8192/s

The parseUid(long) is a tool method to parse the bits

 +------+----------------------+----------------+-----------+
 | sign |     delta seconds    | worker node id | sequence  |
 +------+----------------------+----------------+-----------+
   1bit          28bits              22bits         13bits
 

You can also specified the bits by Spring property setting.

timeBits: default as 28 workerBits: default as 22 seqBits: default as 13 epochStr: Epoch date string format 'yyyy-MM-dd'. Default as '2016-05-20'

Note that: The total bits must be 64 -1

作者:

yutianbao