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================================
Food-based subscription examples
================================
This file gives more subscription examples using a cooking-based example::
>>> from zope.interface.adapter import AdapterRegistry
>>> registry = AdapterRegistry()
>>> import zope.interface
>>> class IAnimal(zope.interface.Interface):
... pass
>>> class IPoultry(IAnimal):
... pass
>>> class IChicken(IPoultry):
... pass
>>> class ISeafood(IAnimal):
... pass
Adapting to some other interface for which there is no
subscription adapter returns an empty sequence::
>>> class IRecipe(zope.interface.Interface):
... pass
>>> class ISausages(IRecipe):
... pass
>>> class INoodles(IRecipe):
... pass
>>> class IKFC(IRecipe):
... pass
>>> list(registry.subscriptions([IPoultry], IRecipe))
[]
unless we define a subscription::
>>> registry.subscribe([IAnimal], ISausages, 'sausages')
>>> list(registry.subscriptions([IPoultry], ISausages))
['sausages']
And define another subscription adapter::
>>> registry.subscribe([IPoultry], INoodles, 'noodles')
>>> meals = list(registry.subscriptions([IPoultry], IRecipe))
>>> meals.sort()
>>> meals
['noodles', 'sausages']
>>> registry.subscribe([IChicken], IKFC, 'kfc')
>>> meals = list(registry.subscriptions([IChicken], IRecipe))
>>> meals.sort()
>>> meals
['kfc', 'noodles', 'sausages']
And the answer for poultry hasn't changed::
>>> meals = list(registry.subscriptions([IPoultry], IRecipe))
>>> meals.sort()
>>> meals
['noodles', 'sausages']
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