Trait SessionStore 

pub trait SessionStore: Send + Sync {
    // Required methods
    fn load_labels<'life0, 'life1, 'async_trait>(
        &'life0 self,
        session_id: &'life1 str,
    ) -> Pin<Box<dyn Future<Output = Result<Vec<String>, SessionStoreError>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait;
    fn append_labels<'life0, 'life1, 'life2, 'async_trait>(
        &'life0 self,
        session_id: &'life1 str,
        labels: &'life2 [String],
    ) -> Pin<Box<dyn Future<Output = Result<(), SessionStoreError>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait;
}

Pluggable session-state backend. Implementations must be Send + Sync — the same store is shared across all concurrent requests.

Invariants:

• append_labels is monotonic — labels added to a session never come back out. Removal (declassification) is a separate operation not covered by v0.
• load_labels for an unknown session_id returns Ok(empty) — a positively-confirmed key-miss is the right response for non-session traffic, and is distinct from a backend failure (Err).
• Both methods return Result so a distributed backend can propagate failures and the caller can fail the request closed. The in-process MemorySessionStore is infallible and always returns Ok.

Required Methods

fn load_labels<'life0, 'life1, 'async_trait>( &'life0 self, session_id: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<Vec<String>, SessionStoreError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Load the union of labels accumulated for the session. Ok(empty) for new or unknown sessions (a confirmed key-miss); Err only on a backend failure.

fn append_labels<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, session_id: &'life1 str, labels: &'life2 [String], ) -> Pin<Box<dyn Future<Output = Result<(), SessionStoreError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Append labels to the session. Existing labels are kept; new ones are unioned in. Caller has already deduped against load_labels in the hot path, but the store re-dedups defensively. Err only on a backend failure.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl SessionStore for MemorySessionStore