pub trait StoreProxyInterface: Send + Sync {
type WriteItemResponseFut: Future<Output = Result<StoreWriteItemResult, Error>> + Send;
type ExportResponseFut: Future<Output = Result<StoreExportResult, Error>> + Send;
// Required methods
fn write_item(&self, attempt: &Item) -> Self::WriteItemResponseFut;
fn export(&self, empty: Vmo) -> Self::ExportResponseFut;
}