pub struct StateWatch<K, V, T, D> {
metrics: Arc<Metrics>,
state: Arc<LockingTypedState<K, V, T, D>>,
seqno_high_water: SeqNo,
rx: Receiver<SeqNo>,
}
Expand description
A reactive subscription to changes in LockingTypedState.
Invariants:
- The
state.seqno
only advances (never regresses). This is guaranteed by LockingTypedState. seqno_high_water
is always <=state.seqno
.- If
seqno_high_water
is <state.seqno
, then we’ll get a notification onrx
. This is maintained by notifying new seqnos under the same lock which adds them. seqno_high_water
always holds the highest value received in the channel This is maintained bywait_for_seqno_gt
taking an exclusive reference to self.
Fields§
§metrics: Arc<Metrics>
§state: Arc<LockingTypedState<K, V, T, D>>
§seqno_high_water: SeqNo
§rx: Receiver<SeqNo>
Implementations§
Source§impl<K, V, T, D> StateWatch<K, V, T, D>
impl<K, V, T, D> StateWatch<K, V, T, D>
pub(crate) fn new( state: Arc<LockingTypedState<K, V, T, D>>, metrics: Arc<Metrics>, ) -> Self
Sourcepub async fn wait_for_seqno_ge(&mut self, requested: SeqNo) -> &mut Self
pub async fn wait_for_seqno_ge(&mut self, requested: SeqNo) -> &mut Self
Blocks until the State has a SeqNo >= the requested one.
This method is cancel-safe.
Trait Implementations§
Auto Trait Implementations§
impl<K, V, T, D> Freeze for StateWatch<K, V, T, D>
impl<K, V, T, D> !RefUnwindSafe for StateWatch<K, V, T, D>
impl<K, V, T, D> Send for StateWatch<K, V, T, D>
impl<K, V, T, D> Sync for StateWatch<K, V, T, D>
impl<K, V, T, D> Unpin for StateWatch<K, V, T, D>
impl<K, V, T, D> !UnwindSafe for StateWatch<K, V, T, D>
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