def testShortCircuit(self):
"""Test that creation short-circuits to reuse existing references"""
sd = {}
for s in self.ss:
sd[s] = 1
for t in self.ts:
if hasattr(t, 'x'):
self.assertTrue(safeRef(t.x) in sd)
else:
self.assertTrue(safeRef(t) in sd)
def setUp(self):
ts = []
ss = []
for x in xrange(5000):
t = Test1()
ts.append(t)
s = safeRef(t.x, self._closure)
ss.append(s)
ts.append(test2)
ss.append(safeRef(test2, self._closure))
for x in xrange(30):
t = Test2()
ts.append(t)
s = safeRef(t, self._closure)
ss.append(s)
self.ts = ts
self.ss = ss
self.closureCount = 0
def setUp(self):
ts = []
ss = []
for x in xrange(5000):
t = Test1()
ts.append(t)
s = safeRef(t.x, self._closure)
ss.append(s)
ts.append(test2)
ss.append(safeRef(test2, self._closure))
for x in xrange(30):
t = Test2()
ts.append(t)
s = safeRef(t, self._closure)
ss.append(s)
self.ts = ts
self.ss = ss
self.closureCount = 0
def disconnect(receiver, signal=Any, sender=Any, weak=True):
"""Disconnect receiver from sender for signal
receiver -- the registered receiver to disconnect
signal -- the registered signal to disconnect
sender -- the registered sender to disconnect
weak -- the weakref state to disconnect
disconnect reverses the process of connect,
the semantics for the individual elements are
logically equivalent to a tuple of
(receiver, signal, sender, weak) used as a key
to be deleted from the internal routing tables.
(The actual process is slightly more complex
but the semantics are basically the same).
Note:
Using disconnect is not required to cleanup
routing when an object is deleted, the framework
will remove routes for deleted objects
automatically. It's only necessary to disconnect
if you want to stop routing to a live object.
returns None, may raise DispatcherTypeError or
DispatcherKeyError
"""
if signal is None:
raise errors.DispatcherTypeError(
'Signal cannot be None (receiver=%r sender=%r)' % (receiver, sender)
)
if weak: receiver = saferef.safeRef(receiver)
senderkey = id(sender)
try:
signals = connections[senderkey]
receivers = signals[signal]
except KeyError:
raise errors.DispatcherKeyError(
"""No receivers found for signal %r from sender %r""" %(
signal,
sender
)
)
try:
# also removes from receivers
_removeOldBackRefs(senderkey, signal, receiver, receivers)
except ValueError:
raise errors.DispatcherKeyError(
"""No connection to receiver %s for signal %s from sender %s""" %(
receiver,
signal,
sender
)
)
_cleanupConnections(senderkey, signal)
def connect(self, receiver, sender=None, weak=True, dispatch_uid=None):
"""Connect receiver to sender for signal
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.
returns None
"""
from django.conf import settings
if settings.DEBUG:
import inspect
assert inspect.getargspec(receiver)[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)
for r_key, _ in self.receivers:
if r_key == lookup_key:
break
else:
self.receivers.append((lookup_key, receiver))
def connect(self, receiver, sender=None, weak=True, dispatch_uid=None):
"""Connect receiver to sender for signal
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.
returns None
"""
from django.conf import settings
if settings.DEBUG:
import inspect
assert inspect.getargspec(receiver)[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)
for r_key, _ in self.receivers:
if r_key == lookup_key:
break
else:
self.receivers.append((lookup_key, receiver))
def disconnect(receiver, signal=Any, sender=Any, weak=True):
"""Disconnect receiver from sender for signal
receiver -- the registered receiver to disconnect
signal -- the registered signal to disconnect
sender -- the registered sender to disconnect
weak -- the weakref state to disconnect
disconnect reverses the process of connect,
the semantics for the individual elements are
logically equivalent to a tuple of
(receiver, signal, sender, weak) used as a key
to be deleted from the internal routing tables.
(The actual process is slightly more complex
but the semantics are basically the same).
Note:
Using disconnect is not required to cleanup
routing when an object is deleted, the framework
will remove routes for deleted objects
automatically. It's only necessary to disconnect
if you want to stop routing to a live object.
returns None, may raise DispatcherTypeError or
DispatcherKeyError
"""
if signal is None:
raise errors.DispatcherTypeError(
'Signal cannot be None (receiver=%r sender=%r)' %
(receiver, sender))
if weak: receiver = saferef.safeRef(receiver)
senderkey = id(sender)
try:
signals = connections[senderkey]
receivers = signals[signal]
except KeyError:
raise errors.DispatcherKeyError(
"""No receivers found for signal %r from sender %r""" %
(signal, sender))
try:
# also removes from receivers
_removeOldBackRefs(senderkey, signal, receiver, receivers)
except ValueError:
raise errors.DispatcherKeyError(
"""No connection to receiver %s for signal %s from sender %s""" %
(receiver, signal, sender))
_cleanupConnections(senderkey, signal)
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 django.conf import settings
# If DEBUG is on, check that we got a good receiver
if settings.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)
for r_key, _ in self.receivers:
if r_key == lookup_key:
break
else:
self.receivers.append((lookup_key, receiver))
def connect(receiver, signal=Any, sender=Any, weak=True):
"""Connect receiver to sender for signal
receiver -- a callable Python object which is to receive
messages/signals/events. 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 are fairly flexible in their specification,
as the machinery in the robustApply module takes care
of most of the details regarding figuring out appropriate
subsets of the sent arguments to apply to a given
receiver.
Note:
if receiver is itself a weak reference (a callable),
it will be de-referenced by the system's machinery,
so *generally* weak references are not suitable as
receivers, though some use might be found for the
facility whereby a higher-level library passes in
pre-weakrefed receiver references.
signal -- the signal to which the receiver should respond
if Any, receiver will receive any signal from the
indicated sender (which might also be Any, but is not
necessarily Any).
Otherwise must be a hashable Python object other than
None (DispatcherError raised on None).
sender -- the sender to which the receiver should respond
if Any, receiver will receive the indicated signals
from any sender.
if Anonymous, receiver will only receive indicated
signals from send/sendExact which do not specify a
sender, or specify Anonymous explicitly as the sender.
Otherwise can be any python object.
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.
returns None, may raise DispatcherTypeError
"""
if signal is None:
raise errors.DispatcherTypeError(
'Signal cannot be None (receiver=%r sender=%r)' % (receiver, sender)
)
if weak:
receiver = saferef.safeRef(receiver, onDelete=_removeReceiver)
senderkey = id(sender)
signals = connections.setdefault(senderkey, {})
# Keep track of senders for cleanup.
# Is Anonymous something we want to clean up?
if sender not in (None, Anonymous, Any):
def remove(object, senderkey=senderkey):
_removeSender(senderkey=senderkey)
# Skip objects that can not be weakly referenced, which means
# they won't be automatically cleaned up, but that's too bad.
try:
weakSender = weakref.ref(sender, remove)
senders[senderkey] = weakSender
except:
pass
receiverID = id(receiver)
# get current set, remove any current references to
# this receiver in the set, including back-references
if signal in signals:
receivers = signals[signal]
_removeOldBackRefs(senderkey, signal, receiver, receivers)
else:
receivers = signals[signal] = []
try:
current = sendersBack.get(receiverID)
if current is None:
sendersBack[ receiverID ] = current = []
if senderkey not in current:
current.append(senderkey)
except:
pass
receivers.append(receiver)
def testIn(self):
"""Test the "in" operator for safe references (cmp)"""
for t in self.ts[:50]:
self.assertTrue(safeRef(t.x) in self.ss)
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 django.conf import settings
# If DEBUG is on, check that we got a good receiver
if settings.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 = {}
def testIn(self):
"""Test the "in" operator for safe references (cmp)"""
for t in self.ts[:50]:
self.assertTrue(safeRef(t.x) in self.ss)
def connect(receiver, signal=Any, sender=Any, weak=True):
"""Connect receiver to sender for signal
receiver -- a callable Python object which is to receive
messages/signals/events. 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 are fairly flexible in their specification,
as the machinery in the robustApply module takes care
of most of the details regarding figuring out appropriate
subsets of the sent arguments to apply to a given
receiver.
Note:
if receiver is itself a weak reference (a callable),
it will be de-referenced by the system's machinery,
so *generally* weak references are not suitable as
receivers, though some use might be found for the
facility whereby a higher-level library passes in
pre-weakrefed receiver references.
signal -- the signal to which the receiver should respond
if Any, receiver will receive any signal from the
indicated sender (which might also be Any, but is not
necessarily Any).
Otherwise must be a hashable Python object other than
None (DispatcherError raised on None).
sender -- the sender to which the receiver should respond
if Any, receiver will receive the indicated signals
from any sender.
if Anonymous, receiver will only receive indicated
signals from send/sendExact which do not specify a
sender, or specify Anonymous explicitly as the sender.
Otherwise can be any python object.
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.
returns None, may raise DispatcherTypeError
"""
if signal is None:
raise errors.DispatcherTypeError(
'Signal cannot be None (receiver=%r sender=%r)' %
(receiver, sender))
if weak:
receiver = saferef.safeRef(receiver, onDelete=_removeReceiver)
senderkey = id(sender)
signals = connections.setdefault(senderkey, {})
# Keep track of senders for cleanup.
# Is Anonymous something we want to clean up?
if sender not in (None, Anonymous, Any):
def remove(object, senderkey=senderkey):
_removeSender(senderkey=senderkey)
# Skip objects that can not be weakly referenced, which means
# they won't be automatically cleaned up, but that's too bad.
try:
weakSender = weakref.ref(sender, remove)
senders[senderkey] = weakSender
except:
pass
receiverID = id(receiver)
# get current set, remove any current references to
# this receiver in the set, including back-references
if signals.has_key(signal):
receivers = signals[signal]
_removeOldBackRefs(senderkey, signal, receiver, receivers)
else:
receivers = signals[signal] = []
try:
current = sendersBack.get(receiverID)
if current is None:
sendersBack[receiverID] = current = []
if senderkey not in current:
current.append(senderkey)
except:
pass
receivers.append(receiver)