Struct Cascade 

pub struct Cascade<A, B> { /* private fields */ }

A layered store: reads try the primary first, then fall back to the secondary; writes always go to the primary.

This is layering (like an overlay filesystem), distinct from OverlayStore, which routes by path prefix. Typical use: runtime overrides cascading over immutable defaults.

Implementations

impl<A, B> Cascade<A, B>

pub fn new(primary: A, fallback: B) -> Self

Layer primary over fallback.

pub fn into_inner(self) -> (A, B)

Unwrap, returning (primary, fallback).

Trait Implementations

impl<A: Reader, B: Reader> Reader for Cascade<A, B>

fn read(&mut self, from: &Path) -> Result<Option<Record>, Error>

Read a record from a path.

fn read_children(&mut self, from: &Path) -> Result<Option<Vec<String>>, Error>

Enumerate the child names directly under a path.

impl<A: Writer, B: Send + Sync> Writer for Cascade<A, B>

fn write(&mut self, to: &Path, data: Record) -> Result<Path, Error>

Write a record to a path.