chore: improve NewSingleton

Taskfile.yml

@@ -16,12 +16,8 @@ tasks:
 
   build:gowork:
     run: once
-    sources:
-      - /ext
-      - /tests
-    generates:
-      - go.work
-      - go.work.sum
+    status:
+      - test -f ../go.work || test -f go.work
     cmds:
       - go work init
       - go work use -r .

internal/singleton/singleton.go

@@ -7,7 +7,7 @@ import (
 // Singleton[T any] provides a common structure for components,
 type Singleton[T any] struct {
 	instances map[string]*T
-	mu        sync.Mutex
+	mu        sync.RWMutex
 }
 
 // NewSingleton creates a new Singleton[T].
@@ -19,15 +19,20 @@ func NewSingleton[T any]() *Singleton[T] {
 
 // Get returns the instance of the component with the given name.
 func (s *Singleton[T]) Get(name string, initFn func() *T) *T {
-	s.mu.Lock()
-	defer s.mu.Unlock()
+	s.mu.RLock()
 
 	if instance, exists := s.instances[name]; exists {
+		s.mu.RUnlock()
 		return instance
 	}
 
+	s.mu.RUnlock()
+
 	instance := initFn()
+
+	s.mu.Lock()
 	s.instances[name] = instance
+	s.mu.Unlock()
 
 	return instance
 }