def vars(cls): """Like the built-in function `vars`, but also works with slotted classes""" if not hasattr(cls, "__slots__"): return _vars_(cls) allVars = OrderedSet() for cls in cls.__mro__: for varName in getattr(cls, "__slots__", tuple()): allVars.add(varName) return allVars
class EventProxy(EventReceiver):
"""
Any method called on this class (besides reserved functions declared in this class) will be proxied out to all
EventReceivers registered with the class.
This class is also an EventReceiver itself, as it receives events. Therefore, multiple EventProxy's can be tied
together; an event proxy can be registered as an EventReceiver with another EventProxy.
"""
def __init__(self, errorOnMethodNotFound):
"""
@param errorOnMethodNotFound bool: If `True`, it is an error when a receiver doesn't implement a method. If `False`, that receiver is simply skipped. Note that if the special method `notifyException` is not implemented, no error will be raised from this class.
"""
self.errorOnMethodNotFound = errorOnMethodNotFound
self._receivers = OrderedSet()
self._tieInExceptHook()
def _tieInExceptHook(self):
oldFunc = sys.excepthook
def branchHook(exceptionClass, exceptionInstance, tracebackInstance):
oldFunc(exceptionClass, exceptionInstance, tracebackInstance)
self.notifyException(exceptionInstance, tracebackInstance)
sys.excepthook = branchHook
def __getattr__(self, name):
# __getattr__ (instead of __getattribute__) won't work because it doesn't work with super
# if hasattr(super(EventProxy, self), name):
# return super(EventProxy, self).__getattribute__(name)
# if name in self.__dict__:
# return self.__dict__
def _run(*args, **kwargs):
found = False
for receiver in self._receivers:
if hasattr(receiver, name):
found = True
getattr(receiver, name)(*args, **kwargs)
if not found:
if name != "notifyException" and self.errorOnMethodNotFound:
raise AttributeError
return _run
def addReceiver(self, receiver, errorOnDuplicate=True):
if self._receivers.add(receiver, updateOnExist=False) == False and errorOnDuplicate:
raise Exception("Event receiver already added")
def getReceivers(self):
return self._receivers