package com.zy.kingdee.utils;

public class SnowFlakeUtils {
    private static SnowFlakeUtils flowIdWorker = new SnowFlakeUtils(1);
    private final long id;
    private final long epoch = 1524291141010L;
    private final long workerIdBits = 10;
    private final long maxWorkerId;
    private final long sequenceBits = 12;
    private final long workerIdShift;
    private final long timestampLeftShift;
    private final long sequenceMask;
    private long sequence;
    private long lastTimestamp;

    private SnowFlakeUtils(long id) {
        getClass();
        this.maxWorkerId = (-1) ^ ((-1) << 10);

        getClass();
        this.workerIdShift = 12L;
        getClass();
        getClass();
        this.timestampLeftShift = 12 + 10;
        getClass();
        this.sequenceMask = (-1) ^ ((-1) << 12);
        this.sequence = 0L;
        this.lastTimestamp = -1L;
        if (id > this.maxWorkerId || id < 0) {
            throw new IllegalArgumentException(String.format("worker Id can't be greater than %d or less than 0", Long.valueOf(this.maxWorkerId)));
        }
        this.id = id;
    }

    public static SnowFlakeUtils getFlowIdInstance() {
        return flowIdWorker;
    }

    private static long timeGen() {
        return System.currentTimeMillis();
    }

    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) {
            SnowFlakeUtils snowFlakeUtils = getFlowIdInstance();
            System.out.println(snowFlakeUtils.nextId());
        }
    }

    public synchronized long nextId() {
        long timestamp = timeGen();
        if (this.lastTimestamp == timestamp) {
            this.sequence = (this.sequence + 1) & this.sequenceMask;
            if (this.sequence == 0) {
                timestamp = tilNextMillis(this.lastTimestamp);
            }
        } else {
            this.sequence = 0L;
        }
        if (timestamp < this.lastTimestamp) {
            return -1L;
        }
        this.lastTimestamp = timestamp;
        getClass();
        return ((timestamp - 1524291141010L) << ((int) this.timestampLeftShift)) | (this.id << ((int) this.workerIdShift)) | this.sequence;
    }

    private long tilNextMillis(long lastTimestamp) {
        long jTimeGen = timeGen();
        while (true) {
            long timestamp = jTimeGen;
            if (timestamp <= lastTimestamp) {
                jTimeGen = timeGen();
            } else {
                return timestamp;
            }
        }
    }
}