org.xipki.ca.server

Class UniqueIdGenerator

java.lang.Object

org.xipki.ca.server.UniqueIdGenerator

public class UniqueIdGenerator
extends Object

Unique Identifier Generator.

An id consists of

1. highest bit is set to 0 to assure positive long.
2. epoch in ms: 46 bits for 1312 years after the epoch
3. offset: 10 bits
4. shard_id: 7 bits

Idea is borrowed from http://instagram-engineering.tumblr.com/post/10853187575/sharding-ids-at-instagram

Since:

2.0.0

Author:

Lijun Liao

Constructor Summary

Constructors

Constructor and Description
UniqueIdGenerator(long epoch, int shardId)

Method Summary

Modifier and Type	Method and Description
long	nextId()

Methods inherited from class java.lang.Object

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

Constructor Detail

UniqueIdGenerator

public UniqueIdGenerator(long epoch,
                         int shardId)

Method Detail

nextId

public long nextId()