Struct ExportRequest 

pub struct ExportRequest {
    pub dest_dir: PathBuf,
    pub reply: Sender<Result<ExportManifest, SnapshotError>>,
}

A request, sent into a running watch_applied loop, to export the fold it owns (see SnapshotStore::export_to).

watch_applied takes its snapshot store by value, so a consumer that wants periodic artifacts of a live fold cannot call export_to itself. It instead passes an mpsc::Receiver<ExportRequest> to watch_applied and sends requests through the paired sender. The loop handles a request between batch flushes — after flushing any pending batch — so the artifact’s embedded cursor is exactly the applied cursor at the moment of export.

The export result (or error) comes back on reply; an export failure is reported there and the watch keeps running (the snapshot is a cache — a failed artifact is the requester’s problem, not the fold’s).

Fields

dest_dir: PathBuf

Where the artifact directory will be created. Must not exist (or be an empty directory); same filesystem as the fold for cheap hardlinks.

reply: Sender<Result<ExportManifest, SnapshotError>>

Receives the sealed manifest on success. A dropped receiver is ignored.