Full library source code:
bind.py
def bind(env):
def bind2env(cls):
setattr(env, cls.__name__, cls)
return cls
return bind2env
module serviceA.py
def defs(env_):
@bind(env_)
class ServiceA:
...
module serviceB.py
def defs(env_):
@bind(env_)
class ServiceB:
TheServiceA = env_.TheServiceA
...
module runtime.py
import serviceA
import serviceB
class Env:
TheServiceA = ServiceA()
TheServiceB = ServiceB()
def __init__(self):
serviceA.defs(self)
serviceB.defs(self)
env = Env()
When ServiceA and ServiceB both depend on each other the previous code fails. To fix it, it is enough to use properties:
module serviceA.py
def defs(env_):
@bind(env_)
class ServiceA:
TheServiceB = property(lambda self: env_.TheServiceB)
module serviceB.py
def defs(env_):
@bind(env_)
class ServiceB:
TheServiceA = property(lambda self: env_.TheServiceA)
...
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