pynest_app_context.py

from module import ModuleCompiler, Module
from typing import Union
from pynest_container import PyNestContainer
from exceptions import UnknownModuleException
import logging

class PyNestApplicationContext: 
    
   _is_initialized = False
   _module_compiler = ModuleCompiler()
   
   @property
   def is_initialized(self):
        return self._is_initialized
   
   @is_initialized.setter
   def is_initialized(self, value: bool): 
        self._is_initialized = value
     
   
   def init(self): 
       if self._is_initialized: 
          return self
       
       self._is_initialized = True
       return self 
       
    
   def __init__(self, 
                container: PyNestContainer,
                context_module: Union[Module, None] = None): 
        self.container = container
        self.context_module: Module = context_module
        self.logger = logging.getLogger(PyNestApplicationContext.__name__)
        
   
   def select_context_module(self): 
       modules = self.container.modules.values()
       self.context_module = next(iter(modules), None)
       
       
   def select(self, module):
       modules_container = self.container.modules
       module_token_factory = self.container.module_token_factory
       
       metadata = self._module_compiler.extract_metadata(module)
       token = module_token_factory.create(metadata["type"], metadata["dynamic_metadata"])
       selected_module = modules_container.get(token)
       if selected_module is None: 
          raise UnknownModuleException()
       
       return PyNestApplicationContext(
          self.container,
          selected_module
       )