app/django/dispatch/dispatcher.py
author Lennard de Rijk <ljvderijk@gmail.com>
Tue, 25 Aug 2009 11:43:14 +0200
changeset 2795 776aae4d0499
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Set new Melange version number to 0-5-20090825 in app.yaml.template.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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import weakref
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try:
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    set
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except NameError:
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    from sets import Set as set # Python 2.3 fallback
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from django.dispatch import saferef
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WEAKREF_TYPES = (weakref.ReferenceType, saferef.BoundMethodWeakref)
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def _make_id(target):
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    if hasattr(target, 'im_func'):
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        return (id(target.im_self), id(target.im_func))
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    return id(target)
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class Signal(object):
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    """Base class for all signals
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    Internal attributes:
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        receivers -- { receriverkey (id) : weakref(receiver) }
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    """
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    def __init__(self, providing_args=None):
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        """providing_args -- A list of the arguments this signal can pass along in
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                       a send() call.
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        """
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        self.receivers = []
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        if providing_args is None:
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            providing_args = []
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        self.providing_args = set(providing_args)
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    def connect(self, receiver, sender=None, weak=True, dispatch_uid=None):
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        """Connect receiver to sender for signal
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        receiver -- a function or an instance method which is to
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            receive signals.  Receivers must be
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            hashable objects.
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            if weak is True, then receiver must be weak-referencable
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            (more precisely saferef.safeRef() must be able to create
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            a reference to the receiver).
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            Receivers must be able to accept keyword arguments.
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            If receivers have a dispatch_uid attribute, the receiver will
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              not be added if another receiver already exists with that
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              dispatch_uid.
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        sender -- the sender to which the receiver should respond
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            Must either be of type Signal, or None to receive events
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            from any sender.
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        weak -- whether to use weak references to the receiver
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            By default, the module will attempt to use weak
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            references to the receiver objects.  If this parameter
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            is false, then strong references will be used.
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        dispatch_uid -- an identifier used to uniquely identify a particular
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            instance of a receiver. This will usually be a string, though it
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            may be anything hashable.
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        returns None
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        """
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        from django.conf import settings
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        # If DEBUG is on, check that we got a good receiver
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        if settings.DEBUG:
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            import inspect
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            assert callable(receiver), "Signal receivers must be callable."
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            # Check for **kwargs
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            # Not all callables are inspectable with getargspec, so we'll
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            # try a couple different ways but in the end fall back on assuming
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            # it is -- we don't want to prevent registration of valid but weird
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            # callables.
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            try:
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                argspec = inspect.getargspec(receiver)
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            except TypeError:
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                try:
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                    argspec = inspect.getargspec(receiver.__call__)
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                except (TypeError, AttributeError):
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                    argspec = None
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            if argspec:
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                assert argspec[2] is not None, \
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                    "Signal receivers must accept keyword arguments (**kwargs)."
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        if dispatch_uid:
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            lookup_key = (dispatch_uid, _make_id(sender))
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        else:
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            lookup_key = (_make_id(receiver), _make_id(sender))
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        if weak:
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            receiver = saferef.safeRef(receiver, onDelete=self._remove_receiver)
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        for r_key, _ in self.receivers:
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            if r_key == lookup_key:
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                break
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        else:
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            self.receivers.append((lookup_key, receiver))
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    def disconnect(self, receiver=None, sender=None, weak=True, dispatch_uid=None):
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        """Disconnect receiver from sender for signal
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        receiver -- the registered receiver to disconnect. May be none if
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            dispatch_uid is specified.
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        sender -- the registered sender to disconnect
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        weak -- the weakref state to disconnect
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        dispatch_uid -- the unique identifier of the receiver to disconnect
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        disconnect reverses the process of connect.
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        If weak references are used, disconnect need not be called.
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          The receiver will be remove from dispatch automatically.
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        returns None
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        """
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        if dispatch_uid:
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            lookup_key = (dispatch_uid, _make_id(sender))
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        else:
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            lookup_key = (_make_id(receiver), _make_id(sender))
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        for idx, (r_key, _) in enumerate(self.receivers):
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            if r_key == lookup_key:
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                del self.receivers[idx]
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    def send(self, sender, **named):
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        """Send signal from sender to all connected receivers.
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        sender -- the sender of the signal
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            Either a specific object or None.
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        named -- named arguments which will be passed to receivers.
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        Returns a list of tuple pairs [(receiver, response), ... ].
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        If any receiver raises an error, the error propagates back
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        through send, terminating the dispatch loop, so it is quite
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        possible to not have all receivers called if a raises an
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        error.
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        """
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        responses = []
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        if not self.receivers:
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            return responses
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        for receiver in self._live_receivers(_make_id(sender)):
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            response = receiver(signal=self, sender=sender, **named)
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            responses.append((receiver, response))
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        return responses
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    def send_robust(self, sender, **named):
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        """Send signal from sender to all connected receivers catching errors
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        sender -- the sender of the signal
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            Can be any python object (normally one registered with
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            a connect if you actually want something to occur).
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        named -- named arguments which will be passed to receivers.
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            These arguments must be a subset of the argument names
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            defined in providing_args.
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        Return a list of tuple pairs [(receiver, response), ... ],
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        may raise DispatcherKeyError
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        if any receiver raises an error (specifically any subclass of Exception),
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        the error instance is returned as the result for that receiver.
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        """
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        responses = []
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        if not self.receivers:
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            return responses
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        # Call each receiver with whatever arguments it can accept.
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        # Return a list of tuple pairs [(receiver, response), ... ].
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        for receiver in self._live_receivers(_make_id(sender)):
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            try:
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                response = receiver(signal=self, sender=sender, **named)
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            except Exception, err:
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                responses.append((receiver, err))
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            else:
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                responses.append((receiver, response))
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        return responses
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    def _live_receivers(self, senderkey):
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        """Filter sequence of receivers to get resolved, live receivers
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        This checks for weak references
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        and resolves them, then returning only live
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        receivers.
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        """
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        none_senderkey = _make_id(None)
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        for (receiverkey, r_senderkey), receiver in self.receivers:
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            if r_senderkey == none_senderkey or r_senderkey == senderkey:
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                if isinstance(receiver, WEAKREF_TYPES):
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                    # Dereference the weak reference.
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                    receiver = receiver()
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                    if receiver is not None:
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                        yield receiver
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                else:
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                    yield receiver
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    def _remove_receiver(self, receiver):
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        """Remove dead receivers from connections."""
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        to_remove = []
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        for key, connected_receiver in self.receivers:
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            if connected_receiver == receiver:
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                to_remove.append(key)
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        for key in to_remove:
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            for idx, (r_key, _) in enumerate(self.receivers):
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                if r_key == key:
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                    del self.receivers[idx]