mirror of
https://github.com/livekit/livekit.git
synced 2026-04-27 23:45:33 +00:00
David Zhao
cd6b8b80b9
Added a new manager to handle all subscription needs. Implemented using reconciler pattern. The goals are: improve subscription resilience by separating desired state and current state reduce complexity of synchronous processing better detect failures with the ability to trigger full reconnect
115 lines
2.4 KiB
Go
115 lines
2.4 KiB
Go
/*
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* Copyright 2023 LiveKit, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package utils
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import (
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"sync"
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)
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type ChangeNotifier struct {
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lock sync.Mutex
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observers map[string]func()
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}
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func NewChangeNotifier() *ChangeNotifier {
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return &ChangeNotifier{
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observers: make(map[string]func()),
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}
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}
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func (n *ChangeNotifier) AddObserver(key string, onChanged func()) {
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n.lock.Lock()
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defer n.lock.Unlock()
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n.observers[key] = onChanged
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}
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func (n *ChangeNotifier) RemoveObserver(key string) {
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n.lock.Lock()
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defer n.lock.Unlock()
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delete(n.observers, key)
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}
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func (n *ChangeNotifier) HasObservers() bool {
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n.lock.Lock()
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defer n.lock.Unlock()
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return len(n.observers) > 0
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}
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func (n *ChangeNotifier) NotifyChanged() {
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n.lock.Lock()
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if len(n.observers) == 0 {
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n.lock.Unlock()
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return
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}
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observers := make([]func(), 0, len(n.observers))
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for _, f := range n.observers {
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observers = append(observers, f)
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}
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n.lock.Unlock()
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go func() {
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for _, f := range observers {
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f()
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}
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}()
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}
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type ChangeNotifierManager struct {
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lock sync.Mutex
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notifiers map[string]*ChangeNotifier
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}
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func NewChangeNotifierManager() *ChangeNotifierManager {
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return &ChangeNotifierManager{
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notifiers: make(map[string]*ChangeNotifier),
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}
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}
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func (m *ChangeNotifierManager) GetNotifier(key string) *ChangeNotifier {
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m.lock.Lock()
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defer m.lock.Unlock()
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return m.notifiers[key]
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}
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func (m *ChangeNotifierManager) GetOrCreateNotifier(key string) *ChangeNotifier {
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m.lock.Lock()
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defer m.lock.Unlock()
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if notifier, ok := m.notifiers[key]; ok {
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return notifier
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}
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notifier := NewChangeNotifier()
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m.notifiers[key] = notifier
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return notifier
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}
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func (m *ChangeNotifierManager) RemoveNotifier(key string, force bool) {
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m.lock.Lock()
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defer m.lock.Unlock()
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if notifier, ok := m.notifiers[key]; ok {
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if force || !notifier.HasObservers() {
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delete(m.notifiers, key)
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}
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}
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}
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