pub trait ControlStateDelegate: ControlStateReadAccess + ControlStateWriteAccess + Send + Sync { }Expand description
API of the SpacetimeDB control plane.
The trait is the composition of ControlStateReadAccess and
ControlStateWriteAccess to reflect the consistency model of SpacetimeDB
as of this writing:
The control plane state represents the desired state of an ensemble of SpacetimeDB nodes. As such, this state can be read from a local (in-memory) representation, which is guaranteed to be “prefix consistent” across all nodes of a cluster. Prefix consistency means that the state being examined is consistent, but reads may not return the most recently written values.
As a consequence, implementations are not currently required to guarantee
read-after-write consistency. In the future, however, write operations may
be required to return the observed state after completing. As this may
require them to suspend themselves while waiting for the writes to propagate,
ControlStateWriteAccess methods are marked async today already.