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Loader

Named module registration and load hooks used at process startup.

pypepper.loader

Named module loader registry singleton.

loader module-attribute 

loader = Loader()

Loader

Source code in pypepper/loader.py 
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class Loader:
    _instance: Loader | None = None
    _module_loader_mapper: dict[str, Callable[[], Any]]

    def __new__(cls) -> Loader:
        if cls._instance is None:
            inst = super().__new__(cls)
            inst._module_loader_mapper = {}
            cls._instance = inst
        return cls._instance

    def __init__(self) -> None:
        pass

    def register(self, module_name: str, func: Callable[[], Any]) -> None:
        if not module_name:
            raise InternalException(ERROR_INVALID_MODULE_NAME)

        if func is None:
            raise InternalException(ERROR_INVALID_LOADER)

        if module_name in self._module_loader_mapper:
            return

        self._module_loader_mapper[module_name] = func

    def load(self, module_name: str, func: Callable[[], Any] | None = None) -> Any:
        if not module_name:
            raise InternalException(ERROR_INVALID_MODULE_NAME)

        if func is not None:
            self.register(module_name, func)

        if module_name not in self._module_loader_mapper:
            raise InternalException(ERROR_NOT_FOUND_MODULE)

        return self._module_loader_mapper[module_name]()

register 

register(module_name: str, func: Callable[[], Any]) -> None
Source code in pypepper/loader.py 
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def register(self, module_name: str, func: Callable[[], Any]) -> None:
    if not module_name:
        raise InternalException(ERROR_INVALID_MODULE_NAME)

    if func is None:
        raise InternalException(ERROR_INVALID_LOADER)

    if module_name in self._module_loader_mapper:
        return

    self._module_loader_mapper[module_name] = func

load 

load(
    module_name: str, func: Callable[[], Any] | None = None
) -> Any
Source code in pypepper/loader.py 
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def load(self, module_name: str, func: Callable[[], Any] | None = None) -> Any:
    if not module_name:
        raise InternalException(ERROR_INVALID_MODULE_NAME)

    if func is not None:
        self.register(module_name, func)

    if module_name not in self._module_loader_mapper:
        raise InternalException(ERROR_NOT_FOUND_MODULE)

    return self._module_loader_mapper[module_name]()