How to use the transitions.core.Event function in transitions

if self.dest:  # if self.dest is None this is an internal transition with no actual state change
            await self._change_state(event_data)

        await event_data.machine.callbacks(itertools.chain(self.after, event_data.machine.after_state_change), event_data)
        _LOGGER.debug("%sExecuted callback after transition.", event_data.machine.name)
        return True

    async def _change_state(self, event_data):
        await event_data.machine.get_state(self.source).exit(event_data)
        event_data.machine.set_state(self.dest, event_data.model)
        event_data.update(event_data.model.state)
        await event_data.machine.get_state(self.dest).enter(event_data)


class AsyncEvent(Event):
    """ A collection of transitions assigned to the same trigger """

    async def trigger(self, model, *args, **kwargs):
        """ Serially execute all transitions that match the current state,
        halting as soon as one successfully completes. Note that `AsyncEvent` triggers must be awaited.
        Args:
            args and kwargs: Optional positional or named arguments that will
                be passed onto the EventData object, enabling arbitrary state
                information to be passed on to downstream triggered functions.
        Returns: boolean indicating whether or not a transition was
            successfully executed (True if successful, False if not).
        """
        func = partial(self._trigger, model, *args, **kwargs)
        t = asyncio.create_task(self.machine._process(func))
        try:
            return await t

# Prevent deep copying of callback lists since these include either references to callable or
    # strings. Deep copying a method reference would lead to the creation of an entire new (model) object
    # (see https://github.com/pytransitions/transitions/issues/248)
    def __deepcopy__(self, memo):
        cls = self.__class__
        result = cls.__new__(cls)
        memo[id(self)] = result
        for key, value in self.__dict__.items():
            if key in cls.dynamic_methods:
                setattr(result, key, copy(value))
            else:
                setattr(result, key, deepcopy(value, memo))
        return result


class NestedEvent(Event):
    """ An event type to work with nested states. """

    def _trigger(self, model, *args, **kwargs):
        state = self.machine.get_state(model.state)
        while state.parent and state.name not in self.transitions:
            state = state.parent
        if state.name not in self.transitions:
            msg = "%sCan't trigger event %s from state %s!" % (self.machine.name, self.name,
                                                               model.state)
            if self.machine.get_state(model.state).ignore_invalid_triggers:
                _LOGGER.warning(msg)
            else:
                raise MachineError(msg)
        event_data = EventData(state, self, self.machine,
                               model, args=args, kwargs=kwargs)
        return self._process(event_data)

self.lock = Lock()

    def __getstate__(self):
        return ''

    def __setstate__(self, value):
        return self.__init__()

    def __enter__(self):
        self.lock.__enter__()

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.lock.__exit__(exc_type, exc_val, exc_tb)


class LockedEvent(Event):
    """ An event type which uses the parent's machine context map when triggered. """

    def trigger(self, model, *args, **kwargs):
        """ Extends transitions.core.Event.trigger by using locks/machine contexts. """
        # pylint: disable=protected-access
        # noinspection PyProtectedMember
        # LockedMachine._locked should not be called somewhere else. That's why it should not be exposed
        # to Machine users.
        if self.machine._locked != get_ident():
            with nested(*self.machine.model_context_map[model]):
                return _super(LockedEvent, self).trigger(model, *args, **kwargs)
        else:
            return _super(LockedEvent, self).trigger(model, *args, **kwargs)


class LockedMachine(Machine):

self.lock = Lock()

    def __getstate__(self):
        return ''

    def __setstate__(self, value):
        return self.__init__()

    def __enter__(self):
        self.lock.__enter__()

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.lock.__exit__(exc_type, exc_val, exc_tb)


class LockedEvent(Event):
    """ An event type which uses the parent's machine context map when triggered. """

    def trigger(self, model, *args, **kwargs):
        """ Extends transitions.core.Event.trigger by using locks/machine contexts. """
        # pylint: disable=protected-access
        # noinspection PyProtectedMember
        # LockedMachine._locked should not be called somewhere else. That's why it should not be exposed
        # to Machine users.
        if self.machine._locked != get_ident():
            with nested(*self.machine.model_context_map[model]):
                return _super(LockedEvent, self).trigger(model, *args, **kwargs)
        else:
            return _super(LockedEvent, self).trigger(model, *args, **kwargs)


class LockedMachine(Machine):

def to_state(self, model, state_name, *args, **kwargs):
        """ Helper function to add go to states in case a custom state separator is used.
        Args:
            model (class): The model that should be used.
            state_name (str): Name of the destination state.
        """

        event = EventData(self.get_state(model.state), Event('to', self), self,
                          model, args=args, kwargs=kwargs)
        self._create_transition(model.state, state_name).execute(event)