rename sharedcalls to singleflight (#1017)

core/syncx/resourcemanager.go

@@ -9,16 +9,16 @@ import (
 
 // A ResourceManager is a manager that used to manage resources.
 type ResourceManager struct {
-	resources   map[string]io.Closer
-	sharedCalls SharedCalls
-	lock        sync.RWMutex
+	resources    map[string]io.Closer
+	singleFlight SingleFlight
+	lock         sync.RWMutex
 }
 
 // NewResourceManager returns a ResourceManager.
 func NewResourceManager() *ResourceManager {
 	return &ResourceManager{
-		resources:   make(map[string]io.Closer),
-		sharedCalls: NewSharedCalls(),
+		resources:    make(map[string]io.Closer),
+		singleFlight: NewSingleFlight(),
 	}
 }
 
@@ -39,7 +39,7 @@ func (manager *ResourceManager) Close() error {
 
 // GetResource returns the resource associated with given key.
 func (manager *ResourceManager) GetResource(key string, create func() (io.Closer, error)) (io.Closer, error) {
-	val, err := manager.sharedCalls.Do(key, func() (interface{}, error) {
+	val, err := manager.singleFlight.Do(key, func() (interface{}, error) {
 		manager.lock.RLock()
 		resource, ok := manager.resources[key]
 		manager.lock.RUnlock()