Distributed self-Growth ID (Twitter's Snowflake Java implementation Scheme)

/**<p> Project name:</p> * <p> package name:com.zdb.module.test</p> * <p> File name:idworker.java</p> * <p> version information:</p> * <p> Date: 2015-5-23-1:17:49 </p> * Copyright  (c)  2015singno Company-All rights reserved  */package com.zdb.module.test;/** <p> name:idworker.java</p> * <p> Description: Distributed self-growth id</p> * <pre> *      twitter's  snowflake Java implementation Solution      * </pre>  *  @author   Bao Jianming  *  @date  2015-5-23  pm 1:17:49 *  @version  1.0.0  */public class idworker {private final long workerid;private final  static long twepoch = 1288834974657L;private long sequence = 0L; private final static long workeridbits = 4l;public final static  long maxworkerid = -1l ^ -1l << workeridbits;private final static long  sequencebits = 10l;private final static long workeridshift =  sequencebits;private final static long timestampleftshift = sequencebits +  workeridbits;public final static long sequencemask = -1l ^ -1l  << sequencebits;private long lasttimestamp = -1l;public idworker ( Final long workerid)  {    super ();    if  (workerId  > this.maxworkerid | |  workerid < 0)  {        throw new  IllegalArgumentException (String.Format (                  "Worker id can ' t be greater than %d or  less than 0 ",                 this.maxworkerid));    }    this.workerid =  Workerid;} Public synchronized long nextid ()  {    long timestamp =  this.timegen ();    if  (This.lasttimestamp == timestamp)  {         this.sequence =  (this.sequence + 1)  &  this.sequenceMask;        if  (this.sequence == 0)  {            system.out.println ("########### " + sequencemask");             timestamp  = this.tilnextmillis (This.lasttimestamp);        }     } else {        this.sequence = 0;     }    if  (Timestamp < this.lasttimestamp)  {         try {             throw new exception (                     string.format (                               "Clock moved backwards.  refusing to generate id for  %d milliseconds ",                             this.lasttimestamp  - timestamp));         } catch  (exception e)  {             e.printstacktrace ();         }    }    this.lastTimestamp = timestamp;     long nextId =  (timestamp - twepoch <<  Timestampleftshift))             |  ( This.workerid << this.workeridshift)  |  (this.sequence);     System.out.println ("Timestamp:"  + timestamp +  ", Timestampleftshift:"              + timestampLeftShift +  ", NextID:"  +  nextId +  ", Workerid:"             +  workerId +  ", Sequence:" &NBSP;+&Nbsp;sequence);     return nextid;} Private long tilnextmillis (Final long lasttimestamp)  {    long  timestamp = this.timegen ();    while  (timestamp <=  Lasttimestamp)  {        timestamp = this.timegen ();     }    return timestamp;} Private long timegen ()  {    return system.currenttimemillis ();} Public static void main (String[] args) {    idworker worker2  = new idworker (2);     system.out.println (Worker2.nextid ());}}

Distributed self-Growth ID (Twitter's Snowflake Java implementation Scheme)