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// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"sync"
)
type KillableService interface {
Kill()
}
type MultitonService[K comparable] struct {
mu sync.Mutex
m map[K]KillableService
}
func (s *MultitonService[K]) Replace(k K, v KillableService) func() {
s.mu.Lock()
defer s.mu.Unlock()
if s.m == nil {
s.m = map[K]KillableService{}
}
if prev, ok := s.m[k]; ok {
prev.Kill()
}
s.m[k] = v
return func() {
s.mu.Lock()
defer s.mu.Unlock()
if s.m[k] == v {
v.Kill()
delete(s.m, k)
}
}
}
func (s *MultitonService[K]) Kill() {
s.mu.Lock()
defer s.mu.Unlock()
for _, v := range s.m {
v.Kill()
}
s.m = nil
}