Refactored code

src/cpl/application/startup_abc.py

@@ -0,0 +1,20 @@
+from abc import ABC, abstractmethod
+
+from cpl.application.application_host_abc import ApplicationHostABC
+from cpl.configuration.configuration_abc import ConfigurationABC
+from cpl.dependency_injection.service_provider_base import ServiceProviderABC
+
+
+class StartupABC(ABC):
+
+    @abstractmethod
+    def __init__(self): pass
+
+    @abstractmethod
+    def create_application_host(self) -> ApplicationHostABC: pass
+
+    @abstractmethod
+    def create_configuration(self) -> ConfigurationABC: pass
+
+    @abstractmethod
+    def create_services(self) -> ServiceProviderABC: pass