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iid.go
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iid.go
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package iid
import (
"sync"
"time"
)
const (
twepoch = int64(1544016000000000)
aidBits = uint(5)
nidBits = uint(9)
sBits = uint(10)
/*
* 1 符号位 | 39 时间戳 | 5 区域 | 9 节点 | 10 (毫秒内)自增ID
* 0 | 0000000 00000000 00000000 00000000 00000000 | 00000 | 000000 000 | 000000 0000
*
*/
nidShift = sBits //左移次数
aidShift = sBits + nidBits
tShift = sBits + aidBits + nidBits
sMask = -1 ^ (-1 << sBits)
)
func Milliseconds() int64 {
return time.Now().UnixNano() / int64(time.Millisecond)
}
type IID struct {
s int64 //序号
aid int64 //区域ID
nid int64 //节点ID
lock sync.Mutex
}
func NewIID(aid int64, nid int64) *IID {
v := IID{}
v.s = 0
v.nid = nid
v.aid = aid
v.lock = sync.Mutex{}
return &v
}
func (v *IID) NewID() int64 {
v.lock.Lock()
defer v.lock.Unlock()
id := Milliseconds()
v.s = (v.s + 1) & sMask
return ((id - twepoch) << tShift) | (v.aid << aidShift) | (v.nid << nidShift) | v.s
}
func GetTime(id int64) time.Duration {
return time.Duration(((id>>tShift)&0x7fffffffff)+twepoch) * time.Millisecond
}