/*
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 Affero 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 Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>
*/

package utils

import "sync"

func NewSyncedChan() *SyncedChan {
	return &SyncedChan{
		c: make(chan struct{}),
		d: new(sync.Once),
	}
}

type SyncedChan struct {
	c chan struct{}
	d *sync.Once
}

func (s *SyncedChan) CloseOnce() {
	s.d.Do(func() {
		close(s.c)
	})
}

func (s *SyncedChan) Done() <-chan struct{} {
	return s.c
}