def _doSub(self, key, val):
attributeInfo = self._subscriberAttributes.get(key,{}).items()
previousAttribute = getattr(self,key,None)
if reflect.isinst(previousAttribute, Publisher):
for event, handlers in attributeInfo:
for handler in handlers:
if handler is None:
handler = WhenMethodSubscription(self, key, event)
# handler = getattr(self, "when_"+key+"_"+event)
try:
previousAttribute.unsubscribe(event, handler)
except KeyError:
# Since this deals with when_ methods, the
# most likely time for an exception to be
# thrown here is when you've added a when
# method. There's no point in stopping
# execution there.
pass
if reflect.isinst(val, Publisher):
for event, handlers in attributeInfo:
for handler in handlers:
if handler is None:
handler = WhenMethodSubscription(self, key, event)
#handler = getattr(self, "when_"+key+"_"+event)
val.subscribe(event, handler)
def unsubscribeFromAttribute(self, attribute, channel, callback):
assert not (self._subscriberAttributes is
self.__class__._subscriberAttributes),\
"No attribute channels have been subscribed."
channels = self._subscriberAttributes[attribute]
handlers = channels[channel]
handlers.remove(callback)
currentPublisher = getattr(self, attribute, None)
if reflect.isinst(currentPublisher, Publisher):
currentPublisher.unsubscribe(channel, callback)
def __cmp__(self, other):
if other is self:
return 0
if not reflect.isinst(other, WhenMethodSubscription):
return -1
for attr in 'subscriber','attribute','channel':
retval = cmp(getattr(self,attr),getattr(other,attr))
if retval != 0:
return retval
return 0
def subscribeToAttribute(self, attribute, channel, callback):
assert callable(callback), "Callback must be a callable type."
if self._subscriberAttributes is self.__class__._subscriberAttributes:
self._subscriberAttributes = copy.deepcopy(self._subscriberAttributes)
channels = self._subscriberAttributes.get(attribute,{})
handlers = channels.get(channel,[])
handlers.append(callback)
channels[channel] = handlers
self._subscriberAttributes[attribute] = channels
currentPublisher = getattr(self, attribute, None)
if reflect.isinst(currentPublisher, Publisher):
currentPublisher.subscribe(channel, callback)
