snapshot of https://github.com/livekit/livekit.git @ 08c5433449c106943231037d0b892895f6e92d3b (2026-09-15)

pkg/utils/changenotifier_test.go

@@ -0,0 +1,122 @@
+// Copyright 2026 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"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestChangeNotifier(t *testing.T) {
+	t.Run("Observer management", func(t *testing.T) {
+		notifier := NewChangeNotifier()
+		require.False(t, notifier.HasObservers())
+
+		called := false
+		notifier.AddObserver("test-key", func() {
+			called = true
+		})
+		require.True(t, notifier.HasObservers())
+
+		notifier.RemoveObserver("test-key")
+		require.False(t, notifier.HasObservers())
+		require.False(t, called)
+	})
+
+	t.Run("Notification triggers callbacks asynchronously", func(t *testing.T) {
+		notifier := NewChangeNotifier()
+		var wg sync.WaitGroup
+		wg.Add(2)
+
+		var mu sync.Mutex
+		callCounts := make(map[string]int)
+
+		notifier.AddObserver("obs1", func() {
+			mu.Lock()
+			callCounts["obs1"]++
+			mu.Unlock()
+			wg.Done()
+		})
+
+		notifier.AddObserver("obs2", func() {
+			mu.Lock()
+			callCounts["obs2"]++
+			mu.Unlock()
+			wg.Done()
+		})
+
+		notifier.NotifyChanged()
+
+		// Wait for async execution of observers
+		done := make(chan struct{})
+		go func() {
+			wg.Wait()
+			close(done)
+		}()
+
+		select {
+		case <-done:
+			// Success
+		case <-time.After(1 * time.Second):
+			t.Fatal("Timeout waiting for change notification callbacks")
+		}
+
+		mu.Lock()
+		require.Equal(t, 1, callCounts["obs1"])
+		require.Equal(t, 1, callCounts["obs2"])
+		mu.Unlock()
+	})
+}
+
+func TestChangeNotifierManager(t *testing.T) {
+	t.Run("Get and Create Notifiers", func(t *testing.T) {
+		manager := NewChangeNotifierManager()
+		require.Nil(t, manager.GetNotifier("non-existent"))
+
+		notifier := manager.GetOrCreateNotifier("room1")
+		require.NotNil(t, notifier)
+
+		retrieved := manager.GetNotifier("room1")
+		require.Equal(t, notifier, retrieved)
+
+		// GetOrCreate should return the existing one
+		again := manager.GetOrCreateNotifier("room1")
+		require.Equal(t, notifier, again)
+	})
+
+	t.Run("Remove Notifiers with HasObservers check", func(t *testing.T) {
+		manager := NewChangeNotifierManager()
+		_ = manager.GetOrCreateNotifier("room1")
+
+		// Case 1: notifier has no observers, should be removed
+		manager.RemoveNotifier("room1", false)
+		require.Nil(t, manager.GetNotifier("room1"))
+
+		// Re-create and add an observer
+		notifier := manager.GetOrCreateNotifier("room1")
+		notifier.AddObserver("observer", func() {})
+
+		// Case 2: notifier has observer, RemoveNotifier(..., false) should not remove it
+		manager.RemoveNotifier("room1", false)
+		require.NotNil(t, manager.GetNotifier("room1"))
+
+		// Case 3: notifier has observer, RemoveNotifier(..., true) (force) should remove it
+		manager.RemoveNotifier("room1", true)
+		require.Nil(t, manager.GetNotifier("room1"))
+	})
+}