[sugar] DBus-python and signals with changing types

[Benjamin M. Schwartz]

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I would like to create a simple D-Bus signal of the form

    @dbus.service.signal(dbus_interface=self.IFACE)
    def send(self, message):
        return

However, I do not know the type signature of "message" ahead of time.  I also do
not know whether the user wants byte_arrays=True, etc.  I would like to set
these parameters each time send() is called.  How can I do this?

The only way that I have thought of is to do:

def send(self, message, signature=None, byte_arrays=True):
    self._sig = signature
    self._ba = byte_arrays
    self._actual_send(message)

@dbus.service.signal(dbus_interface=self.IFACE, signature=self._sig,
byte_arrays=self._ba)
def _actual_send(self, message):
    return

Will this work?  Is it threadsafe (I think not)? Is there a better way?

- --Ben
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