Struct WorkerConfig 

pub struct WorkerConfig {
    pub writer: Arc<PersistentResultCacheWriter>,
    pub io: Arc<dyn PersistentCacheIo>,
    pub cipher: Option<Arc<AesCipher>>,
    pub staleness: Arc<dyn StalenessGuard>,
    pub max_staleness_retries: u32,
    pub completion: Option<Sender<()>>,
}

Configuration for spawning a spawn_persistent_cache_worker.

Fields

writer: Arc<PersistentResultCacheWriter>

Writer to drain. Must outlive the worker.

io: Arc<dyn PersistentCacheIo>

I/O backend. The worker uses write_atomic / remove / clear / load. Must outlive the worker.

cipher: Option<Arc<AesCipher>>

Optional encryption cipher. When Some, the worker encrypts every payload before framing; when None, the payload is written in plaintext.

staleness: Arc<dyn StalenessGuard>

Stale-check guard. The worker re-checks that the queued entry’s (key, key_generation, clear_generation) is still the latest snapshot before publishing. When the guard reports a stale match, the op is skipped and counted as StoreStale.

max_staleness_retries: u32

Maximum stale-checks to perform per op. Prevents unbounded work on a single contended key.

completion: Option<Sender<()>>

Optional completion signal. When Some, the worker sends () immediately before exiting. The receiver (held by the engine) uses recv_timeout(remaining_deadline) to wait for a bounded shutdown. Send errors (receiver dropped) are ignored.