Module dependencies as static var

example/api/src/main.py

@@ -1,9 +1,9 @@
 from starlette.responses import JSONResponse
 
-from cpl import api
+from cpl.api.api_module import ApiModule
 from cpl.api.application.web_app import WebApp
-from cpl.api_module import ApiModule
-from cpl.application import ApplicationBuilder
+from cpl.application.application_builder import ApplicationBuilder
+from cpl.auth import AuthModule
 from cpl.auth.permission.permissions import Permissions
 from cpl.auth.schema import AuthUser, Role
 from cpl.core.configuration import Configuration
@@ -40,7 +40,13 @@ def main():
     app.with_authentication()
     app.with_authorization()
 
-    app.with_route(path="/route1", fn=lambda r: JSONResponse("route1"), method="GET", authentication=True, permissions=[Permissions.administrator])
+    app.with_route(
+        path="/route1",
+        fn=lambda r: JSONResponse("route1"),
+        method="GET",
+        authentication=True,
+        permissions=[Permissions.administrator],
+    )
     app.with_routes_directory("routes")
 
     provider = builder.service_provider

src/cpl-api/cpl/api/__init__.py

@@ -1,3 +1,4 @@
 from .error import APIError, AlreadyExists, EndpointNotImplemented, Forbidden, NotFound, Unauthorized
 from .logger import APILogger
 from .settings import ApiSettings
+from .api_module import ApiModule

src/cpl-api/cpl/api/api_module.py

@@ -0,0 +1,21 @@
+from cpl.auth.auth_module import AuthModule
+from cpl.auth.permission.permission_module import PermissionsModule
+from cpl.database.database_module import DatabaseModule
+from cpl.dependency.module import Module
+from cpl.dependency.service_collection import ServiceCollection
+
+
+class ApiModule(Module):
+    dependencies = []
+
+    @staticmethod
+    def register(collection: ServiceCollection):
+        from cpl.api.registry.policy import PolicyRegistry
+        from cpl.api.registry.route import RouteRegistry
+
+        collection.add_module(DatabaseModule)
+        collection.add_module(AuthModule)
+        collection.add_module(PermissionsModule)
+
+        collection.add_singleton(PolicyRegistry)
+        collection.add_singleton(RouteRegistry)

src/cpl-api/cpl/api/application/web_app.py

@@ -25,7 +25,7 @@ from cpl.api.registry.route import RouteRegistry
 from cpl.api.router import Router
 from cpl.api.settings import ApiSettings
 from cpl.api.typing import HTTPMethods, PartialMiddleware, PolicyResolver
-from cpl.api_module import ApiModule
+from cpl.api.api_module import ApiModule
 from cpl.application.abc.application_abc import ApplicationABC
 from cpl.auth.auth_module import AuthModule
 from cpl.auth.permission.permission_module import PermissionsModule

src/cpl-api/cpl/api_module.py

@@ -1,26 +0,0 @@
-from cpl.api.registry.policy import PolicyRegistry
-from cpl.api.registry.route import RouteRegistry
-from cpl.auth.auth_module import AuthModule
-from cpl.auth.permission.permission_module import PermissionsModule
-from cpl.core.errors import dependency_error
-from cpl.database.database_module import DatabaseModule
-from cpl.database.model.server_type import ServerType, ServerTypes
-from cpl.database.mysql.mysql_module import MySQLModule
-from cpl.dependency.module import Module, TModule
-
-
-class ApiModule(Module):
-
-    @staticmethod
-    def dependencies() -> list[TModule]:
-        return [AuthModule, DatabaseModule, PermissionsModule]
-
-    @staticmethod
-    def register(collection: "ServiceCollection"):
-        collection.add_module(DatabaseModule)
-
-        collection.add_module(AuthModule)
-        collection.add_module(PermissionsModule)
-
-        collection.add_singleton(PolicyRegistry)
-        collection.add_singleton(RouteRegistry)

src/cpl-auth/cpl/auth/__init__.py

@@ -7,6 +7,7 @@ from cpl.auth.keycloak.keycloak_admin import KeycloakAdmin as _KeycloakAdmin
 from cpl.auth.keycloak.keycloak_client import KeycloakClient as _KeycloakClient
 from .keycloak_settings import KeycloakSettings
 from .logger import AuthLogger
+from .auth_module import AuthModule
 
 
 def _with_permissions(self: _ApplicationABC, *permissions: Type[Enum]) -> _ApplicationABC:

src/cpl-auth/cpl/auth/auth_module.py

@@ -1,30 +1,31 @@
 import os
 
-from cpl.auth.keycloak.keycloak_admin import KeycloakAdmin as _KeycloakAdmin
-from cpl.auth.keycloak.keycloak_client import KeycloakClient as _KeycloakClient
 from cpl.database.database_module import DatabaseModule
 from cpl.database.model.server_type import ServerType, ServerTypes
+from cpl.database.mysql.mysql_module import MySQLModule
+from cpl.database.postgres.postgres_module import PostgresModule
 from cpl.database.service.migration_service import MigrationService
-from cpl.dependency.module import Module, TModule
+from cpl.dependency.module import Module
 from cpl.dependency.service_collection import ServiceCollection
-from .schema._administration.api_key_dao import ApiKeyDao
-from .schema._administration.auth_user_dao import AuthUserDao
-from .schema._permission.api_key_permission_dao import ApiKeyPermissionDao
-from .schema._permission.permission_dao import PermissionDao
-from .schema._permission.role_dao import RoleDao
-from .schema._permission.role_permission_dao import RolePermissionDao
-from .schema._permission.role_user_dao import RoleUserDao
 
 
 class AuthModule(Module):
-    @staticmethod
-    def dependencies() -> list[TModule]:
-        return [DatabaseModule]
+    dependencies = [DatabaseModule, (MySQLModule, PostgresModule)]
 
     @staticmethod
     def register(collection: ServiceCollection):
-        collection.add_singleton(_KeycloakClient)
-        collection.add_singleton(_KeycloakAdmin)
+        from cpl.auth.keycloak.keycloak_admin import KeycloakAdmin
+        from cpl.auth.keycloak.keycloak_client import KeycloakClient
+        from .schema._administration.api_key_dao import ApiKeyDao
+        from .schema._administration.auth_user_dao import AuthUserDao
+        from .schema._permission.api_key_permission_dao import ApiKeyPermissionDao
+        from .schema._permission.permission_dao import PermissionDao
+        from .schema._permission.role_dao import RoleDao
+        from .schema._permission.role_permission_dao import RolePermissionDao
+        from .schema._permission.role_user_dao import RoleUserDao
+
+        collection.add_singleton(KeycloakClient)
+        collection.add_singleton(KeycloakAdmin)
 
         collection.add_singleton(AuthUserDao)
         collection.add_singleton(ApiKeyDao)

src/cpl-auth/cpl/auth/permission/__init__.py

@@ -0,0 +1,4 @@
+from .permission_module import PermissionsModule
+from .permission_seeder import PermissionSeeder
+from .permissions import Permissions
+from .permissions_registry import PermissionsRegistry

src/cpl-auth/cpl/auth/permission/permission_module.py

@@ -3,16 +3,13 @@ from cpl.auth.permission.permission_seeder import PermissionSeeder
 from cpl.auth.permission.permissions import Permissions
 from cpl.auth.permission.permissions_registry import PermissionsRegistry
 from cpl.database.abc.data_seeder_abc import DataSeederABC
-from cpl.dependency.module import Module, TModule
+from cpl.database.database_module import DatabaseModule
+from cpl.dependency.module import Module
 from cpl.dependency.service_collection import ServiceCollection
 
 
 class PermissionsModule(Module):
-    @staticmethod
-    def dependencies() -> list[TModule]:
-        from cpl.database.database_module import DatabaseModule
-
-        return [DatabaseModule, AuthModule]
+    dependencies = [DatabaseModule, AuthModule]
 
     @staticmethod
     def register(collection: ServiceCollection):

src/cpl-core/cpl/core/errors.py

@@ -16,7 +16,7 @@ def dependency_error(src: str, package_name: str, e: ImportError = None) -> None
 
 
 def module_dependency_error(src: str, module: str, e: ImportError = None) -> None:
-    Console.error(f"'{module}' is required to use feature: {src}. Please initialize it with `add_module({module})`.")
+    Console.error(f"'{module}' is required by '{src}'. Please initialize it with `add_module({module})`.")
     tb = traceback.format_exc()
     if not tb.startswith("NoneType: None"):
         Console.write_line("->", tb)

src/cpl-database/cpl/database/__init__.py

@@ -3,7 +3,9 @@ import os
 from cpl.application.abc import ApplicationABC as _ApplicationABC
 from . import mysql as _mysql
 from . import postgres as _postgres
+from .database_module import DatabaseModule
 from .table_manager import TableManager
+from .logger import DBLogger
 
 
 def _with_migrations(self: _ApplicationABC, *paths: str | list[str]) -> _ApplicationABC:

src/cpl-database/cpl/database/abc/__init__.py

@@ -1,4 +1,6 @@
 from .connection_abc import ConnectionABC
+from .data_access_object_abc import DataAccessObjectABC
+from .data_seeder_abc import DataSeederABC
 from .db_context_abc import DBContextABC
 from .db_join_model_abc import DbJoinModelABC
 from .db_model_abc import DbModelABC

src/cpl-database/cpl/database/abc/data_access_object_abc.py

@@ -14,7 +14,7 @@ from cpl.database.logger import DBLogger
 from cpl.database.model.server_type import ServerType, ServerTypes
 from cpl.database.postgres.sql_select_builder import SQLSelectBuilder
 from cpl.database.typing import T_DBM, Attribute, AttributeFilters, AttributeSorts
-from cpl.dependency import get_provider
+from cpl.dependency.context import get_provider
 
 
 class DataAccessObjectABC(ABC, Generic[T_DBM]):

src/cpl-database/cpl/database/abc/db_model_dao_abc.py

@@ -2,7 +2,7 @@ from abc import abstractmethod
 from datetime import datetime
 from typing import Type
 
-from cpl.database import TableManager
+from cpl.database.table_manager import TableManager
 from cpl.database.abc.data_access_object_abc import DataAccessObjectABC
 from cpl.database.abc.db_model_abc import DbModelABC
 

src/cpl-database/cpl/database/database_module.py

@@ -1,22 +1,18 @@
-from cpl.core.errors import module_dependency_error
-from cpl.database.model.server_type import ServerType
-from cpl.database.schema.executed_migration_dao import ExecutedMigrationDao
-from cpl.database.service.migration_service import MigrationService
-from cpl.database.service.seeder_service import SeederService
-from cpl.dependency.module import Module, TModule
+from cpl.database.mysql.mysql_module import MySQLModule
+from cpl.database.postgres.postgres_module import PostgresModule
+from cpl.dependency.module import Module
 from cpl.dependency.service_collection import ServiceCollection
 
 
 class DatabaseModule(Module):
-    @staticmethod
-    def dependencies() -> list[TModule]:
-        if not ServerType.has_server_type:
-            module_dependency_error(__name__, "MySQLModule or PostgresModule")
-
-        return []
+    dependencies = [(MySQLModule, PostgresModule)]
 
     @staticmethod
     def register(collection: ServiceCollection):
+        from cpl.database.schema import ExecutedMigrationDao
+        from cpl.database.service.migration_service import MigrationService
+        from cpl.database.service.seeder_service import SeederService
+
         collection.add_singleton(ExecutedMigrationDao)
         collection.add_singleton(MigrationService)
         collection.add_singleton(SeederService)

src/cpl-database/cpl/database/mysql/__init__.py

@@ -0,0 +1,4 @@
+from .connection import DatabaseConnection
+from .db_context import DBContext
+from .mysql_module import MySQLModule
+from .mysql_pool import MySQLPool

src/cpl-database/cpl/database/mysql/mysql_module.py

@@ -1,18 +1,17 @@
 from cpl.core.configuration.configuration import Configuration
-from cpl.database.abc.db_context_abc import DBContextABC
 from cpl.database.model.server_type import ServerTypes, ServerType
-from cpl.database.mysql.db_context import DBContext
-from cpl.dependency.module import Module, TModule
+from cpl.dependency.module import Module
 from cpl.dependency.service_collection import ServiceCollection
 
 
 class MySQLModule(Module):
-    @staticmethod
-    def dependencies() -> list[TModule]:
-        return []
+    dependencies = []
 
     @staticmethod
     def register(collection: ServiceCollection):
+        from cpl.database.abc.db_context_abc import DBContextABC
+        from cpl.database.mysql.db_context import DBContext
+
         ServerType.set_server_type(ServerTypes(ServerTypes.MYSQL.value))
         Configuration.set("DB_DEFAULT_PORT", 3306)
 

src/cpl-database/cpl/database/postgres/__init__.py

@@ -0,0 +1,4 @@
+from .db_context import DBContext
+from .postgres_module import PostgresModule
+from .postgres_pool import PostgresPool
+from .sql_select_builder import SQLSelectBuilder

src/cpl-database/cpl/database/postgres/postgres_module.py

@@ -1,19 +1,17 @@
 from cpl.core.configuration.configuration import Configuration
-from cpl.database.abc.db_context_abc import DBContextABC
-from cpl.database.database_module import DatabaseModule
 from cpl.database.model.server_type import ServerTypes, ServerType
-from cpl.database.postgres.db_context import DBContext
-from cpl.dependency.module import Module, TModule
+from cpl.dependency.module import Module
 from cpl.dependency.service_collection import ServiceCollection
 
 
 class PostgresModule(Module):
-    @staticmethod
-    def dependencies() -> list[TModule]:
-        return [DatabaseModule]
+    dependencies = []
 
     @staticmethod
     def register(collection: ServiceCollection):
+        from cpl.database.abc.db_context_abc import DBContextABC
+        from cpl.database.postgres.db_context import DBContext
+
         ServerType.set_server_type(ServerTypes(ServerTypes.POSTGRES.value))
         Configuration.set("DB_DEFAULT_PORT", 5432)
 

src/cpl-database/cpl/database/schema/__init__.py

@@ -0,0 +1,2 @@
+from .executed_migration import ExecutedMigration
+from .executed_migration_dao import ExecutedMigrationDao

src/cpl-database/cpl/database/schema/executed_migration_dao.py

@@ -1,4 +1,4 @@
-from cpl.database import TableManager
+from cpl.database.table_manager import TableManager
 from cpl.database.abc.data_access_object_abc import DataAccessObjectABC
 from cpl.database.schema.executed_migration import ExecutedMigration
 

src/cpl-database/cpl/database/service/migration_service.py

@@ -1,9 +1,9 @@
 import glob
 import os
 
-from cpl.database.abc import DBContextABC
+from cpl.database.abc.db_context_abc import DBContextABC
 from cpl.database.logger import DBLogger
-from cpl.database.model import Migration
+from cpl.database.model.migration import Migration
 from cpl.database.model.server_type import ServerType, ServerTypes
 from cpl.database.schema.executed_migration import ExecutedMigration
 from cpl.database.schema.executed_migration_dao import ExecutedMigrationDao

src/cpl-dependency/cpl/dependency/module.py

@@ -1,14 +1,22 @@
 from abc import abstractmethod, ABC
-from typing import Type
-
-TModule = Type["Module"]
+from inspect import isclass
 
 
 class Module(ABC):
+    __REQUIRED_VARS = ["dependencies"]
 
-    @staticmethod
-    @abstractmethod
-    def dependencies() -> list[TModule]: ...
+    def __init_subclass__(cls):
+        super().__init_subclass__()
+        for var in cls.__REQUIRED_VARS:
+            if not hasattr(cls, var):
+                raise TypeError(f"Can't instantiate abstract class {cls.__name__} without {var} attribute")
+
+            if not isinstance(getattr(cls, var), list):
+                raise TypeError(f"Can't instantiate abstract class {cls.__name__} with non-list {var} attribute")
+
+            for dep in getattr(cls, var):
+                if not isinstance(dep, (list, tuple)) and not isclass(dep):
+                    raise TypeError(f"Can't instantiate abstract class {cls.__name__} with invalid dependency {dep}")
 
     @staticmethod
     @abstractmethod

src/cpl-dependency/cpl/dependency/service_collection.py

@@ -1,6 +1,7 @@
 from inspect import isclass
-from typing import Union, Type, Callable, Self
+from typing import Union, Callable, Self, Type
 
+from cpl.core.errors import module_dependency_error
 from cpl.core.log.logger_abc import LoggerABC
 from cpl.core.typing import T, Service
 from cpl.core.utils.cache import Cache
@@ -9,6 +10,7 @@ from cpl.dependency.module import Module
 from cpl.dependency.service_descriptor import ServiceDescriptor
 from cpl.dependency.service_lifetime import ServiceLifetimeEnum
 from cpl.dependency.service_provider import ServiceProvider
+from cpl.dependency.typing import TModule, TService, TStartupTask
 
 
 class ServiceCollection:
@@ -16,11 +18,6 @@ class ServiceCollection:
 
     _modules: dict[str, Callable] = {}
 
-    @classmethod
-    def with_module(cls, func: Callable, name: str = None) -> type[Self]:
-        # cls._modules[func.__name__ if name is None else name] = func
-        return cls
-
     def __init__(self):
         self._service_descriptors: list[ServiceDescriptor] = []
         self._loaded_modules: set[str] = set()
@@ -29,6 +26,47 @@ class ServiceCollection:
     def loaded_modules(self) -> set[str]:
         return self._loaded_modules
 
+    def _check_dependency(self, module: TModule, dependency: TModule | TService, optional: bool = False) -> bool:
+        if not issubclass(dependency, Module):
+            found_services = [
+                x
+                for x in self._service_descriptors
+                if x.service_type == dependency or x.base_type == dependency or isinstance(x.implementation, dependency)
+            ]
+
+            if len(found_services) > 0:
+                return True
+
+            if optional:
+                return False
+
+            module_dependency_error(module.__name__, dependency.__name__)
+
+        if dependency.__name__ not in self._loaded_modules:
+            if optional:
+                return False
+
+            module_dependency_error(module.__name__, dependency.__name__)
+
+        return True
+
+    def _check_dependencies(self, module: TModule):
+        dependencies: list[TModule | Type] = getattr(module, "dependencies", [])
+        for dependency in dependencies:
+            if isinstance(dependency, (list, tuple)):
+                deps_exists = [self._check_dependency(module, dep, optional=True) for dep in dependency]
+
+                if not any(deps_exists):
+                    if len(dependency) > 1:
+                        names = ", ".join([dep.__name__ for dep in dependency[:-1]]) + f" or {dependency[-1].__name__}"
+                    else:
+                        names = dependency[0].__name__
+
+                    module_dependency_error(module.__name__, names)
+                continue
+
+            self._check_dependency(module, dependency)
+
     def _add_descriptor(self, service: Union[type, object], lifetime: ServiceLifetimeEnum, base_type: Callable = None):
         found = False
         for descriptor in self._service_descriptors:
@@ -44,7 +82,9 @@ class ServiceCollection:
 
         self._service_descriptors.append(ServiceDescriptor(service, lifetime, base_type))
 
-    def _add_descriptor_by_lifetime(self, service_type: Type, lifetime: ServiceLifetimeEnum, service: Callable = None):
+    def _add_descriptor_by_lifetime(
+            self, service_type: TService | T, lifetime: ServiceLifetimeEnum, service: Callable = None
+    ):
         if service is not None:
             self._add_descriptor(service, lifetime, service_type)
         else:
@@ -52,19 +92,19 @@ class ServiceCollection:
 
         return self
 
-    def add_singleton(self, service_type: T, service: Service = None) -> Self:
+    def add_singleton(self, service_type: TService | T, service: Service = None) -> Self:
         self._add_descriptor_by_lifetime(service_type, ServiceLifetimeEnum.singleton, service)
         return self
 
-    def add_scoped(self, service_type: T, service: Service = None) -> Self:
+    def add_scoped(self, service_type: TService | T, service: Service = None) -> Self:
         self._add_descriptor_by_lifetime(service_type, ServiceLifetimeEnum.scoped, service)
         return self
 
-    def add_transient(self, service_type: T, service: Service = None) -> Self:
+    def add_transient(self, service_type: TService | T, service: Service = None) -> Self:
         self._add_descriptor_by_lifetime(service_type, ServiceLifetimeEnum.transient, service)
         return self
 
-    def add_startup_task(self, task: Type[StartupTask]) -> Self:
+    def add_startup_task(self, task: TStartupTask) -> Self:
         self.add_singleton(StartupTask, task)
         return self
 
@@ -76,17 +116,15 @@ class ServiceCollection:
         sp = ServiceProvider(self._service_descriptors)
         return sp
 
-    def add_module(self, module: Type[Module]) -> Self:
+    def add_module(self, module: TModule) -> Self:
         assert isclass(module), "Module must be a Module"
         assert issubclass(module, Module), f"Module must be subclass of {Module.__name__}"
 
         name = module.__name__
         if module in self._modules:
-            raise ValueError(f"Module {module} not found")
+            raise ValueError(f"Module {name} is already registered")
 
-        for dependency in module.dependencies():
-            if dependency.__name__ not in self._loaded_modules:
-                self.add_module(dependency)
+        self._check_dependencies(module)
 
         module().register(self)
 
@@ -114,6 +152,6 @@ class ServiceCollection:
             self.add_transient(wrapper)
         return self
 
-    def add_cache(self, t: Type[T]):
+    def add_cache(self, t: TService):
         self._service_descriptors.append(ServiceDescriptor(Cache(t=t), ServiceLifetimeEnum.singleton, Cache[t]))
         return self

src/cpl-dependency/cpl/dependency/typing.py

@@ -0,0 +1,9 @@
+from typing import Type
+
+from cpl.core.typing import T
+from cpl.dependency.hosted import StartupTask
+from cpl.dependency.module import Module
+
+TModule = Type[Module]
+TService = Type[T]
+TStartupTask = Type[StartupTask]

src/cpl-mail/cpl/mail/__init__.py

@@ -1,20 +1,6 @@
-from cpl.dependency import ServiceCollection as _ServiceCollection
 from .abc.email_client_abc import EMailClientABC
 from .email_client import EMailClient
 from .email_client_settings import EMailClientSettings
 from .email_model import EMail
 from .logger import MailLogger
-
-
-def add_mail(collection: _ServiceCollection):
-    from cpl.core.console import Console
-    from cpl.core.log import LoggerABC
-
-    try:
-        collection.add_singleton(EMailClientABC, EMailClient)
-        collection.add_transient(LoggerABC, MailLogger)
-    except ImportError as e:
-        Console.error("cpl-translation is not installed", str(e))
-
-
-_ServiceCollection.with_module(add_mail, __name__)
+from .mail_module import MailModule

src/cpl-mail/cpl/mail/mail_module.py

@@ -1,14 +1,13 @@
-from cpl.dependency import ServiceCollection
+from cpl.dependency.service_collection import ServiceCollection
 from cpl.dependency.module import Module, TModule
-from cpl.mail.email_client import EMailClient
-from cpl.mail.abc.email_client_abc import EMailClientABC
 
 
 class MailModule(Module):
-    @staticmethod
-    def dependencies() -> list[TModule]:
-        return []
+    dependencies = []
 
     @staticmethod
     def register(collection: ServiceCollection):
+        from cpl.mail.abc.email_client_abc import EMailClientABC
+        from cpl.mail.email_client import EMailClient
+
         collection.add_singleton(EMailClientABC, EMailClient)

src/cpl-translation/cpl/translation/__init__.py

@@ -1,22 +1,5 @@
-from cpl.dependency import ServiceCollection as _ServiceCollection
 from .translate_pipe import TranslatePipe
+from .translation_module import TranslationModule
 from .translation_service import TranslationService
 from .translation_service_abc import TranslationServiceABC
 from .translation_settings import TranslationSettings
-
-
-def add_translation(collection: _ServiceCollection):
-    from cpl.core.console import Console
-    from cpl.core.pipes import PipeABC
-    from cpl.translation.translate_pipe import TranslatePipe
-    from cpl.translation.translation_service import TranslationService
-    from cpl.translation.translation_service_abc import TranslationServiceABC
-
-    try:
-        collection.add_singleton(TranslationServiceABC, TranslationService)
-        collection.add_transient(PipeABC, TranslatePipe)
-    except ImportError as e:
-        Console.error("cpl-translation is not installed", str(e))
-
-
-_ServiceCollection.with_module(add_translation, __name__)

src/cpl-translation/cpl/translation/translation_module.py

@@ -1,14 +1,13 @@
-from cpl.dependency import ServiceCollection
-from cpl.dependency.module import Module, TModule
-from cpl.translation.translation_service import TranslationService
+from cpl.dependency.service_collection import ServiceCollection
+from cpl.dependency.module import Module
 from cpl.translation.translation_service_abc import TranslationServiceABC
 
 
 class TranslationModule(Module):
-    @staticmethod
-    def dependencies() -> list[TModule]:
-        return []
+    dependencies = []
 
     @staticmethod
     def register(collection: ServiceCollection):
+        from cpl.translation.translation_service import TranslationService
+
         collection.add_singleton(TranslationServiceABC, TranslationService)