pub struct StreamSeqTracker<S: StorageEngine> { /* private fields */ }Expand description
Tracks the per-stream monotonic sequence frontier for outbound frame stamping and ack recording.
Thread-safe via an internal Mutex. Persist-before-send is enforced
in [next_seq]: storage is flushed before the sequence number is returned
to the caller.
Implementations§
Source§impl<S: StorageEngine> StreamSeqTracker<S>
impl<S: StorageEngine> StreamSeqTracker<S>
Sourcepub async fn load(storage: Arc<S>) -> Result<Self, LiteError>
pub async fn load(storage: Arc<S>) -> Result<Self, LiteError>
Load all persisted stream sequence entries from Namespace::Meta.
Scans keys starting with b"sync.stream_seq:" and parses each
16-byte value as last_assigned || last_acked (two big-endian u64s).
Returns an empty tracker if no entries are stored yet.
Sourcepub async fn next_seq(&self, stream_id: u64) -> Result<u64, LiteError>
pub async fn next_seq(&self, stream_id: u64) -> Result<u64, LiteError>
Assign the next sequence number for stream_id.
Computes next = last_assigned + 1, persists the updated frontier to
Namespace::Meta BEFORE returning (persist-before-send invariant), then
returns next.
The in-memory lock is dropped before the storage await to avoid holding it across async I/O.
Sourcepub async fn record_ack(
&self,
stream_id: u64,
applied_seq: u64,
) -> Result<(), LiteError>
pub async fn record_ack( &self, stream_id: u64, applied_seq: u64, ) -> Result<(), LiteError>
Record that Origin has applied applied_seq for stream_id.
Advances last_acked (and last_assigned if needed to stay consistent),
then persists. No-op if applied_seq <= current last_acked.
Sourcepub async fn last_acked(&self, stream_id: u64) -> u64
pub async fn last_acked(&self, stream_id: u64) -> u64
Return the highest acknowledged sequence for stream_id, or 0 if unknown.
Sourcepub async fn last_assigned(&self, stream_id: u64) -> u64
pub async fn last_assigned(&self, stream_id: u64) -> u64
Return the highest assigned sequence for stream_id, or 0 if unknown.
Auto Trait Implementations§
impl<S> !Freeze for StreamSeqTracker<S>
impl<S> RefUnwindSafe for StreamSeqTracker<S>where
Arc<S>: RefUnwindSafe,
impl<S> Send for StreamSeqTracker<S>
impl<S> Sync for StreamSeqTracker<S>
impl<S> Unpin for StreamSeqTracker<S>
impl<S> UnsafeUnpin for StreamSeqTracker<S>where
Arc<S>: UnsafeUnpin,
impl<S> UnwindSafe for StreamSeqTracker<S>where
Arc<S>: UnwindSafe,
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