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timeid.go
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timeid.go
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// Copyright © 2014 Terry Mao, LiuDing All rights reserved.
// This file is part of gopush-cluster.
// gopush-cluster is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// gopush-cluster is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with gopush-cluster. If not, see <http://www.gnu.org/licenses/>.
package id
import (
"time"
)
type TimeID struct {
lastID int64
}
// NewTimeID create a new TimeID struct
func NewTimeID() *TimeID {
return &TimeID{lastID: 0}
}
// ID generate a time ID
func (t *TimeID) ID() int64 {
for {
s := time.Now().UnixNano() / 100
if t.lastID >= s {
// if last time id > current time, may be who change the system id,
// so sleep last time id minus current time
time.Sleep(time.Duration((t.lastID-s+1)*100) * time.Nanosecond)
} else {
// save the current time id
t.lastID = s
return s
}
}
return 0
}