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from typing import Callable |
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import attr |
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from so_magic.utils import Command, Subject, CommandFactoryInterface, CommandFactoryType |
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class DataManagerCommandFactoryBuilder(metaclass=CommandFactoryType): |
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@classmethod |
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def create_factory(cls, name, callback): |
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@DataManagerCommandFactoryBuilder.register_as_subclass(name) |
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class DataManagerRuntimeCommandFactory(CommandFactoryInterface): |
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def construct(self, *args, **kwargs) -> Command: |
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receiver = args[0] |
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def command(*runtime_args): |
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callback(receiver, *runtime_args) |
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return Command(command, '__call__', *args[1:]) |
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@attr.s |
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class DataManagerCommandFactory: |
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_data_manager = attr.ib(init=True) |
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command_factory = attr.ib(init=True, default=DataManagerCommandFactoryBuilder) |
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subject: Subject = attr.ib(init=False, default=attr.Factory(Subject)) |
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name: str = attr.ib(init=False, default='') |
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def __call__(self, command_type, *args, **kwargs): |
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self.subject.state = self.command_factory.create(command_type).construct(self._data_manager, *args, **kwargs) |
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self.subject.name = command_type |
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self.subject.notify() |
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return self.subject.state |
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def build_command_prototype(self): |
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def wrapper(a_callable: Callable) -> Callable: |
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"""Build and register a new Command given a callable object that holds the important business logic. |
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Args: |
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a_callable (Callable): the Command's important underlying business logic |
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""" |
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if hasattr(a_callable, '__code__'): # a_callable object has been defined with the def python keyword |
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decorated_function_name = a_callable.__code__.co_name |
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self.command_factory.create_factory(decorated_function_name, a_callable) |
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self(decorated_function_name) |
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else: |
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raise RuntimeError(f"Expected a function to be decorated; got {type(a_callable)}") |
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return a_callable |
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return wrapper |
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boromir674 /
so-magic
