class Publisher(SignalLogger):
"""Base class for signaling Publisher.
The base __init__ function setups the signaling object that a Subscriber can connect to.
"""
def __init__(self):
"""Setups signaling object.
"""
super().__init__()
self._signal = Signal()
def subscribe(self, handle):
"""Subscribe a handle to this publisher.
"""
self._signal.connect(handle)
def unsubscribe(self, handle):
"""Unsubscribe a handle from this publisher.
"""
self._signal.disconnect(handle)
def emit(self, **kwargs):
"""Emits arguments to the subscribers.
"""
self._signal.send(sender=self, **kwargs)
def suspended_signal( signal, receiver, sender=None, weak=True, dispatch_uid=None ):
result = Signal.disconnect( signal, receiver, sender=sender, dispatch_uid=dispatch_uid )
assert result, 'Signal was not disconnected; details: {}'.format(
(signal, receiver, sender, dispatch_uid))
try:
yield result
finally:
Signal.connect( signal, receiver, sender=sender, weak=weak, dispatch_uid=dispatch_uid )
