diff --git a/service.go b/service.go
index 066d28e..97226da 100644
--- a/service.go
+++ b/service.go
@@ -1,6 +1,6 @@
 package contracts
 
 type Service interface {
-	GetResListener(code string) ResListener
-	GetAppControllerr(code string) Controller
+	GetResListener(code string) (ResListener, bool)
+	GetAppControllerr(code string) (Controller, bool)
 }