def unsubscribe(self, callback, resource, event):
"""Unsubscribe callback from the registry.
:param callback: the callback.
:param resource: the resource.
:param event: the event.
"""
LOG.debug("Unsubscribe: %(callback)s %(resource)s %(event)s", {
'callback': callback,
'resource': resource,
'event': event
})
callback_id = self._find(callback)
if not callback_id:
LOG.debug("Callback %s not found", callback_id)
return
if resource and event:
del self._callbacks[resource][event][callback_id]
self._index[callback_id][resource].discard(event)
if not self._index[callback_id][resource]:
del self._index[callback_id][resource]
if not self._index[callback_id]:
del self._index[callback_id]
else:
value = '%s,%s' % (resource, event)
raise exceptions.Invalid(element='resource,event', value=value)
def publish(self, resource, event, trigger, payload=None):
"""Notify all subscribed callback(s) with a payload.
Dispatch the resource's event to the subscribed callbacks.
:param resource: The resource for the event.
:param event: The event.
:param trigger: The trigger. A reference to the sender of the event.
:param payload: The optional event object to send to subscribers. If
passed this must be an instance of BaseEvent.
:raises Invalid, CallbackFailure: The Invalid exception is raised if
the payload object is not an instance of BaseEvent. CallbackFailure
is raise if the underlying callback has errors.
"""
if payload:
if not isinstance(payload, events.EventPayload):
raise exceptions.Invalid(element='event payload',
value=type(payload))
return self.notify(resource, event, trigger, payload=payload)
def _validate_resource_type(resource_type):
if not resources.is_valid_resource_type(resource_type):
raise exceptions.Invalid(element='resource', value=resource_type)
