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seq.go
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seq.go
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package config
import (
"fmt"
"sync"
"sync/atomic"
"github.com/gocraft/dbr/v2"
)
var seqMap = map[string]*Seq{}
var seqLock sync.RWMutex
var seqStep int64 = 1000 // 序列号步长
// Seq Seq
type Seq struct {
CurSeq int64
MaxSeq int64
}
// GenSeq 生产序号
func (c *Context) GenSeq(flag string) int64 {
seqLock.RLock()
seq := seqMap[flag]
seqLock.RUnlock()
key := fmt.Sprintf("seq:%s", flag)
if seq == nil {
// seqStr, err := c.Cache().Get(key)
seqM, err := querySeqWithKey(c.DB(), key)
if err != nil {
panic(err)
}
if seqM == nil {
var currSeq int64 = 1000000 // TODO: 为了兼容老的(以前放redis的)所以这里起始seq尽量大点
err = addOrUpdateSeq(c.DB(), &seqModel{
Key: key,
Step: int(seqStep),
MinSeq: currSeq + seqStep,
})
// err = c.Cache().Set(key, fmt.Sprintf("%d", seqStep))
if err != nil {
panic(err)
}
seq = &Seq{
CurSeq: currSeq,
MaxSeq: currSeq + seqStep,
}
} else {
seq = &Seq{
CurSeq: seqM.MinSeq,
MaxSeq: seqM.MinSeq,
}
}
seqLock.Lock()
seqMap[flag] = seq
seqLock.Unlock()
}
if seq.CurSeq >= seq.MaxSeq { // 超过了最大序号
// err := c.Cache().Set(key, fmt.Sprintf("%d", seq.CurSeq+seqStep))
err := addOrUpdateSeq(c.DB(), &seqModel{
Key: key,
Step: int(seqStep),
MinSeq: seq.CurSeq + seqStep,
})
if err != nil {
panic(err)
}
seq.MaxSeq += seqStep
}
return atomic.AddInt64(&seq.CurSeq, 1)
}
func addOrUpdateSeq(session *dbr.Session, m *seqModel) error {
_, err := session.InsertBySql("insert into `seq`(`key`,min_seq,step) values(?,?,?) ON DUPLICATE KEY UPDATE min_seq=VALUES(min_seq)", m.Key, m.MinSeq, m.Step).Exec()
return err
}
func querySeqWithKey(session *dbr.Session, key string) (*seqModel, error) {
var m *seqModel
_, err := session.Select("*").From("seq").Where("`key`=?", key).Load(&m)
return m, err
}
type seqModel struct {
Key string
MinSeq int64
Step int
}