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simple.py
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simple.py
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from haps import SINGLETON_SCOPE, Container, Egg, inject, scope
class HeaterInterface:
pass
class PumpInterface:
pass
class ExtraPumpInterface(PumpInterface):
pass
class CoffeeMaker:
@inject
def __init__(self, heater: HeaterInterface, pump: PumpInterface):
self.heater = heater
self.pump = pump
def make_coffee(self):
return "heater: %r\npump: %r" % (self.heater, self.pump)
class Heater:
@inject
def __init__(self, extra_pump: ExtraPumpInterface):
self.extra_pump = extra_pump
def __repr__(self):
return '<Heater id=%s\nextra_pump=%r>' % (
id(self), self.extra_pump)
class Pump:
@inject
def __init__(self, heater: HeaterInterface):
self.heater = heater
def __repr__(self):
return '<Pump id=%s heater=%r>' % (id(self), self.heater)
@scope(SINGLETON_SCOPE) # Only one instance per application is allowed
class ExtraPump:
def __repr__(self):
return '<ExtraPump id=%s>' % (id(self),)
Container.configure([
Egg(HeaterInterface, HeaterInterface, None, Heater),
Egg(PumpInterface, PumpInterface, None, Pump),
Egg(ExtraPumpInterface, ExtraPumpInterface, None, ExtraPump),
])
if __name__ == '__main__':
print(CoffeeMaker().make_coffee())
# Ouput
# heater: <Heater id=140440945316584
# extra_pump=<ExtraPump id=140440945316696>>
# pump: <Pump id=140440945316640 heater=<Heater id=140440945316808
# extra_pump=<ExtraPump id=140440945316696>>>