JAVA Snowflake algorithm

Package util;/** * Snowflake Algorithm * * @author Zengwei * @email [email protected] * @date 2018-03-25 22:02 */public class Idwork    Er {private final long workerid;    Private final long Snsepoch = 1330328109047L;    Private long sequence = 0L;    Private final long workeridbits = 10L;    Private final Long Maxworkerid = -1l ^ -1l << this.workeridbits;    Private final long sequencebits = 12L;    Private final long workeridshift = this.sequencebits;    Private final Long Timestampleftshift = this.sequencebits + this.workeridbits;    Private final Long Sequencemask = -1l ^ -1l << this.sequencebits;    Private long lasttimestamp = -1l;        Public Idworker (Long Workerid) {super (); if (Workerid > This.maxworkerid | | Workerid < 0) {throw new IllegalArgumentException (String.Format ("work        Er Id can ' t is greater than%d or less than 0 ", This.maxworkerid));    } This.workerid = Workerid; } Public synchronized Long NextID () throws Exception {       Long timestamp = This.timegen ();            if (This.lasttimestamp = = timestamp) {this.sequence = this.sequence + 1 & this.sequencemask;            if (this.sequence = = 0) {timestamp = This.tilnextmillis (This.lasttimestamp);        }} else {this.sequence = 0; } if (timestamp < This.lasttimestamp) {throw new Exception (String.Format ("Clock moved backwards.        Refusing to generate ID for%d milliseconds ", (This.lasttimestamp-timestamp)));        } This.lasttimestamp = timestamp; return Timestamp-this.snsepoch << This.timestampleftshift | This.workerid << This.workeridshift |    This.sequence; }/** * Guarantees the number of milliseconds returned after the parameter * * @param lasttimestamp * @return */Private long tilnextmillis (long Las        Ttimestamp) {Long timestamp = This.timegen ();        while (timestamp <= lasttimestamp) {timestamp = This.timegen (); } return timeStamp     }/** * Gets the current number of milliseconds in the system * * @return */Private Long Timegen () {return system.currenttimemillis ();        } public static void Main (string[] args) {Integer workid = 1;        Idworker idwork = new Idworker (workid);        try {System.out.println (string.valueof-Idwork.nextid ()));        } catch (Exception e) {e.printstacktrace (); }    }}

　　

JAVA Snowflake algorithm