/
concureqs.go
69 lines (58 loc) · 1.48 KB
/
concureqs.go
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/*
Real-time Online/Offline Charging System (OCS) for Telecom & ISP environments
Copyright (C) ITsysCOM GmbH
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>
*/
package utils
import (
"fmt"
)
var ConReqs *ConcReqs
type ConcReqs struct {
limit int
strategy string
aReqs chan struct{}
}
func NewConReqs(reqs int, strategy string) *ConcReqs {
cR := &ConcReqs{
limit: reqs,
strategy: strategy,
aReqs: make(chan struct{}, reqs),
}
for i := 0; i < reqs; i++ {
cR.aReqs <- struct{}{}
}
return cR
}
var errDeny = fmt.Errorf("denying request due to maximum active requests reached")
func (cR *ConcReqs) Allocate() (err error) {
if cR.limit == 0 {
return
}
switch cR.strategy {
case MetaBusy:
if len(cR.aReqs) == 0 {
return errDeny
}
fallthrough
case MetaQueue:
<-cR.aReqs // get from channel
}
return
}
func (cR *ConcReqs) Deallocate() {
if cR.limit == 0 {
return
}
cR.aReqs <- struct{}{}
return
}