def bind(self, key, receiver, weak=True):
_key = self.backend.parse_key(key)
if _key is None:
logger.error("{0} is invaild key".format(key))
return
if weak:
receiver = saferef.safeRef(receiver, onDelete=self._remove_receiver)
with self.lock:
self.receivers[_key] = receiver
def bind(self, key, receiver, weak=True):
_key = self.backend.parse_key(key)
if _key is None:
logger.error("{0} is invaild key".format(key))
return
if weak:
receiver = saferef.safeRef(receiver,
onDelete=self._remove_receiver)
with self.lock:
self.receivers[_key] = receiver
def connect(self, receiver, sender=None, weak=True, dispatch_uid=None):
"""
Connect receiver to sender for signal.
Arguments:
receiver
A function or an instance method which is to receive signals.
Receivers must be hashable objects.
If weak is True, then receiver must be weak-referencable (more
precisely saferef.safeRef() must be able to create a reference
to the receiver).
Receivers must be able to accept keyword arguments.
If receivers have a dispatch_uid attribute, the receiver will
not be added if another receiver already exists with that
dispatch_uid.
sender
The sender to which the receiver should respond. Must either be
of type Signal, or None to receive events from any sender.
weak
Whether to use weak references to the receiver. By default, the
module will attempt to use weak references to the receiver
objects. If this parameter is false, then strong references will
be used.
dispatch_uid
An identifier used to uniquely identify a particular instance of
a receiver. This will usually be a string, though it may be
anything hashable.
"""
from dtalk.conf import DEBUG
# If DEBUG is on, check that we got a good receiver
if DEBUG:
import inspect
assert callable(receiver), "Signal receivers must be callable."
# Check for **kwargs
# Not all callables are inspectable with getargspec, so we'll
# try a couple different ways but in the end fall back on assuming
# it is -- we don't want to prevent registration of valid but weird
# callables.
try:
argspec = inspect.getargspec(receiver)
except TypeError:
try:
argspec = inspect.getargspec(receiver.__call__)
except (TypeError, AttributeError):
argspec = None
if argspec:
assert argspec[2] is not None, \
"Signal receivers must accept keyword arguments (**kwargs)."
if dispatch_uid:
lookup_key = (dispatch_uid, _make_id(sender))
else:
lookup_key = (_make_id(receiver), _make_id(sender))
if weak:
receiver = saferef.safeRef(receiver, onDelete=self._remove_receiver)
with self.lock:
for r_key, _ in self.receivers:
if r_key == lookup_key:
break
else:
self.receivers.append((lookup_key, receiver))
self.sender_receivers_cache.clear()