def _release_resource(resource_id):
"""
Do not queue this task yourself, but always use the _queue_release_resource() task instead.
Please see the docblock on that function for an explanation.
When a resource-reserving task is complete, this method must be called with the
resource_id so that the we know when it is safe to unmap a resource_id from
its given queue name.
:param resource_id: The resource that is no longer in use
:type resource_id: basestring
"""
try:
reserved_resource = ReservedResource(resource_id)
reserved_resource.decrement_num_reservations()
# Now we need to decrement the AvailabeQueue that the reserved_resource was using. If the
# ReservedResource does not exist for some reason, we won't know its assigned_queue, but
# these next lines won't execute anyway.
available_queue = AvailableQueue(reserved_resource.assigned_queue)
available_queue.decrement_num_reservations()
except DoesNotExist:
# If we are trying to decrement the count on one of these obejcts, and they don't exist,
# that's OK
pass
