Struct oasis_runtime_sdk::storage::OverlayStore

pub struct OverlayStore<S: Store> { /* private fields */ }

An overlay store which keeps values locally until explicitly committed.

Implementations

impl<S: Store> OverlayStore<S>

pub fn new(parent: S) -> Self

Create a new overlay store.

Trait Implementations

impl<S: Store> NestedStore for OverlayStore<S>

type Inner = S

Type of the inner store.

fn commit(self) -> Self::Inner

Commit any changes to the underlying store.

fn rollback(self) -> Self::Inner

Rollback any changes.

fn has_pending_updates(&self) -> bool

Whether there are any store updates pending to be committed.

fn pending_update_byte_size(&self) -> usize

Size (in bytes) of any pending updates.

impl<S: Store> Store for OverlayStore<S>

fn get(&self, key: &[u8]) -> Option<Vec<u8>>

Fetch entry with given key.

fn insert(&mut self, key: &[u8], value: &[u8])

Update entry with given key to the given value.

fn remove(&mut self, key: &[u8])

Remove entry with given key.

fn iter(&self) -> Box<dyn Iterator + '_>

Returns an iterator over the tree.

fn prefetch_prefixes(&mut self, prefixes: Vec<Prefix>, limit: u16)

Populate the in-memory tree with nodes for keys starting with given prefixes.