org.dromara.warm.flow.core.keygen

Class SnowFlakeId14

java.lang.Object

org.dromara.warm.flow.core.keygen.SnowFlakeId14

All Implemented Interfaces:

KenGen

public class SnowFlakeId14
extends Object
implements KenGen

warm 生成14位有序id

Author:

warm

Field Summary

Fields

Modifier and Type	Field and Description
private long	lastTimestamp 上次生成ID的时间截
private long	maxWorkerId 支持的最大机器id，结果是31 (这个移位算法可以很快的计算出几位二进制数所能表示的最大十进制数)
private long	sequence 毫秒内序列(0~4095)
private long	sequenceBits 序列在id中占的位数
private long	sequenceMask 生成序列的掩码，这里为4095 (0b111111111111=0xfff=4095)
private long	startTime 开始时间截 (本次时间戳为：Thu Nov 04 2010 09:42:54 GMT+0800 (中国标准时间)----1288834974657L---1656543015264587776--19 )
private long	timestampLeftShift 时间截向左移22位(10+12)
private long	workerId 工作机器ID(0~1024)
private long	workerIdBits 机器id所占的位数
private long	workerIdShift 机器ID向左移12位

Constructor Summary

Constructors

Constructor and Description
SnowFlakeId14(long workerId) 构造函数

Method Summary

Modifier and Type	Method and Description
long	nextId() 获得下一个ID (该方法是线程安全的)
protected long	tilNextMillis(long lastTimestamp) 阻塞到下一个毫秒，直到获得新的时间戳
protected long	timeGen() 返回以毫秒为单位的当前时间

Methods inherited from class java.lang.Object

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

Field Detail

startTime

private final long startTime

开始时间截 (本次时间戳为：Thu Nov 04 2010 09:42:54 GMT+0800 (中国标准时间)----1288834974657L---1656543015264587776--19 )

See Also:

Constant Field Values

workerIdBits

private final long workerIdBits

机器id所占的位数

See Also:

Constant Field Values

maxWorkerId

private final long maxWorkerId

支持的最大机器id，结果是31 (这个移位算法可以很快的计算出几位二进制数所能表示的最大十进制数)

See Also:

Constant Field Values

sequenceBits

private final long sequenceBits

序列在id中占的位数

See Also:

Constant Field Values

workerIdShift

private final long workerIdShift

机器ID向左移12位

See Also:

Constant Field Values

timestampLeftShift

private final long timestampLeftShift

时间截向左移22位(10+12)

See Also:

Constant Field Values

sequenceMask

private final long sequenceMask

生成序列的掩码，这里为4095 (0b111111111111=0xfff=4095)

See Also:

Constant Field Values

workerId

private long workerId

工作机器ID(0~1024)

sequence

private long sequence

毫秒内序列(0~4095)

lastTimestamp

private long lastTimestamp

上次生成ID的时间截

Constructor Detail

SnowFlakeId14

public SnowFlakeId14(long workerId)

构造函数

Parameters:

workerId - 工作ID (0~1024)

Method Detail

nextId

public long nextId()

获得下一个ID (该方法是线程安全的)

Specified by:

nextId in interface KenGen

Returns:

SnowflakeId

tilNextMillis

protected long tilNextMillis(long lastTimestamp)

阻塞到下一个毫秒，直到获得新的时间戳

Parameters:

lastTimestamp - 上次生成ID的时间截

Returns:

当前时间戳

timeGen

protected long timeGen()

返回以毫秒为单位的当前时间

Returns:

当前时间(毫秒)