Snowflake (JavaUtil 2.7.1 API)

java.lang.Object
- com.github.luomingxuorg.javautil.util.Snowflake

```
public class Snowflake
extends Object
```
分布式ID生成类 Adapted from Twitter's Snowflake http://github.com/twitter/snowflake

字段概要

字段
限定符和类型	字段和说明
`private long`	`dataCenterId`
`private static long`	`dataCenterIdBits`
`private static long`	`dataCenterIdMask`
`private static long`	`dataCenterIdShift`
`private static long`	`epoch`
`private long`	`lastTimestamp`
`private static Random`	`RANDOM` sequence随机种子(兼容低并发下, sequence均为0的情况)
`private long`	`sequence`
`private static long`	`sequenceBits`
`private static long`	`sequenceMask`
`private static long`	`timestampShift`
`private long`	`workerId`
`private static long`	`workerIdBits`
`private static long`	`workerIdMask`
`private static long`	`workerIdShift`

构造器概要

构造器
构造器和说明

Snowflake(long dataCenterId, long workerId, long projectStartEpoch)
构造函数

构造器
构造器和说明
`Snowflake(long dataCenterId, long workerId, long projectStartEpoch)` 构造函数

方法概要

所有方法实例方法具体方法
限定符和类型	方法和说明
`long`	`nextId()`
`private long`	`tilNextMillis(long lastTimestamp)`
`protected boolean`	`timeBackwardsCallback(long timestamp, long lastTimestamp)` default callback 可以自定义在子类中修改, 只需结果为true即可生成nextId()
`private long`	`timestamp()`

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - epoch
```
private static long epoch
```
  - workerIdBits
```
private static final long workerIdBits
```
    另请参阅:
    
    常量字段值
  - dataCenterIdBits
```
private static final long dataCenterIdBits
```
    另请参阅:
    
    常量字段值
  - sequenceBits
```
private static final long sequenceBits
```
    另请参阅:
    
    常量字段值
  - workerIdShift
```
private static final long workerIdShift
```
    另请参阅:
    
    常量字段值
  - dataCenterIdShift
```
private static final long dataCenterIdShift
```
    另请参阅:
    
    常量字段值
  - timestampShift
```
private static final long timestampShift
```
    另请参阅:
    
    常量字段值
  - sequenceMask
```
private static final long sequenceMask
```
    另请参阅:
    
    常量字段值
  - workerIdMask
```
private static final long workerIdMask
```
    另请参阅:
    
    常量字段值
  - dataCenterIdMask
```
private static final long dataCenterIdMask
```
    另请参阅:
    
    常量字段值
  - workerId
```
private final long workerId
```
  - dataCenterId
```
private final long dataCenterId
```
  - sequence
```
private long sequence
```
  - lastTimestamp
```
private long lastTimestamp
```
  - RANDOM
```
private static final Random RANDOM
```
    sequence随机种子(兼容低并发下, sequence均为0的情况)
- 构造器详细资料
  - Snowflake
```
public Snowflake(long dataCenterId,
                 long workerId,
                 long projectStartEpoch)
```
    构造函数
    
    参数:
    
    dataCenterId - 可以使用ip地址来标识
    
    workerId - machineID, 最好是对工作的机器有一个统一的编号, 使用这个编号作为工作ID
    
    projectStartEpoch - 设置为项目开始的时候的时间戳, 则可以在此时间之后使用69年不会有重复ID
- 方法详细资料
  - nextId
```
public long nextId()
```
  - tilNextMillis
```
private long tilNextMillis(long lastTimestamp)
```
  - timestamp
```
private long timestamp()
```
  - timeBackwardsCallback
```
protected boolean timeBackwardsCallback(long timestamp,
                                        long lastTimestamp)
```
    default callback 可以自定义在子类中修改, 只需结果为true即可生成nextId()
    
    参数:
    
    timestamp - 当前时间
    
    lastTimestamp - 上次生成Id的时间
    
    返回:
    
    callback是否处理成功

类 Snowflake

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

epoch

workerIdBits

dataCenterIdBits

sequenceBits

workerIdShift

dataCenterIdShift

timestampShift

sequenceMask

workerIdMask

dataCenterIdMask

workerId

dataCenterId

sequence

lastTimestamp

RANDOM

构造器详细资料

Snowflake

方法详细资料

nextId

tilNextMillis

timestamp

timeBackwardsCallback