def create_subscription(self, query=None, exchange_name='', name='', description='', exchange_point=''):
'''
@brief Create a new subscription. The id string returned is the ID of the new subscription
in the resource registry.
@param query is a subscription query object (Stream Query, Exchange Query, etc...)
@param exchange_name is the name (queue) where messages will be delivered for this subscription
@param name (optional) is the name of the subscription
@param description (optional) is the description of the subscription
@param query Unknown
@param exchange_name str
@param name str
@param description str
@retval subscription_id str
@throws BadRequestError Throws when the subscription query object type is not found
'''
log.debug("Creating subscription object")
subscription = Subscription(name, description=description)
subscription.exchange_name = exchange_name
subscription.exchange_point = exchange_point or 'science_data'
subscription.query = query
if isinstance(query, StreamQuery):
subscription.subscription_type = SubscriptionTypeEnum.STREAM_QUERY
elif isinstance(query, ExchangeQuery):
subscription.subscription_type = SubscriptionTypeEnum.EXCHANGE_QUERY
else:
raise BadRequest("Query type does not exist")
subscription_id, _ = self.clients.resource_registry.create(subscription)
#we need the stream_id to create the association between the
#subscription and stream.
if subscription.subscription_type == SubscriptionTypeEnum.STREAM_QUERY:
for stream_id in subscription.query.stream_ids:
self.clients.resource_registry.create_association(subscription_id, PRED.hasStream, stream_id)
return subscription_id
