Commit 3fcca0e9 authored by Anssi Kääriäinen's avatar Anssi Kääriäinen
Browse files

Added a way to check if a signal has listeners

parent 07ffe781

django/dispatch/dispatcher.py

+3 −0
Original line number Diff line number Diff line
@@ -141,6 +141,9 @@ class Signal(object): 
                    del self.receivers[index]

                    break



    def has_listeners(self, sender=None):

        return bool(self._live_receivers(_make_id(sender)))



    def send(self, sender, **named):

        """

        Send signal from sender to all connected receivers.

tests/regressiontests/dispatch/tests/test_dispatcher.py

+11 −0
Original line number Diff line number Diff line
@@ -126,6 +126,17 @@ class DispatcherTests(unittest.TestCase): 
        a_signal.disconnect(receiver_3)

        self._testIsClean(a_signal)



    def test_has_listeners(self):

        self.assertIs(a_signal.has_listeners(), False)

        self.assertIs(a_signal.has_listeners(sender=object()), False)

        receiver_1 = Callable()

        a_signal.connect(receiver_1)

        self.assertIs(a_signal.has_listeners(), True)

        self.assertIs(a_signal.has_listeners(sender=object()), True)

        a_signal.disconnect(receiver_1)

        self.assertIs(a_signal.has_listeners(), False)

        self.assertIs(a_signal.has_listeners(sender=object()), False)





class ReceiverTestCase(unittest.TestCase):

    """