github.com/livekit/protocol@v1.16.1-0.20240517185851-47e4c6bba773/utils/multitonservice.go (about) 1 // Copyright 2023 LiveKit, Inc. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package utils 16 17 import ( 18 "sync" 19 ) 20 21 type KillableService interface { 22 Kill() 23 } 24 25 type MultitonService[K comparable] struct { 26 mu sync.Mutex 27 m map[K]KillableService 28 } 29 30 func (s *MultitonService[K]) Replace(k K, v KillableService) func() { 31 s.mu.Lock() 32 defer s.mu.Unlock() 33 34 if s.m == nil { 35 s.m = map[K]KillableService{} 36 } 37 38 if prev, ok := s.m[k]; ok { 39 prev.Kill() 40 } 41 42 s.m[k] = v 43 44 return func() { 45 s.mu.Lock() 46 defer s.mu.Unlock() 47 if s.m[k] == v { 48 v.Kill() 49 delete(s.m, k) 50 } 51 } 52 } 53 54 func (s *MultitonService[K]) Kill() { 55 s.mu.Lock() 56 defer s.mu.Unlock() 57 for _, v := range s.m { 58 v.Kill() 59 } 60 s.m = nil 61 }