Struct MemVersionedStateStore 

pub struct MemVersionedStateStore<V: VersionIdentifier>(/* private fields */);

Memory-implemented (volatile) VersionedStateStore for testing/debugging purpose.

Implementations

impl<V: VersionIdentifier> MemVersionedStateStore<V>

pub fn new() -> Self

Trait Implementations

impl<V: VersionIdentifier> VersionedStateStore<V> for MemVersionedStateStore<V>

fn atomic_write<'a>( &'a self, base: Option<&V>, version_id: &V, changes: Box<dyn Iterator<Item = (Key, Option<Value>)> + 'a>, ) -> Result<(), VersionedStateStoreError>

Atomically apply a list of changes described by the iterator to the state of the base version, saved in the new version. Also set the latest version to version. For each iterated item, a None value will remove the value if it exists.

impl<V: VersionIdentifier> VersionedStateStoreR<V> for MemVersionedStateStore<V>

fn debug_iter<'a>( &'a self, version_id: &V, ) -> Box<dyn Iterator<Item = (Key, Value)> + 'a>

fn get(&self, version_id: &V, key: Key) -> Option<Value>

Retrieve the value for a particular version given a key. Returns None if not exists.

fn get_all(&self, version_id: &V, key_prefix: Key) -> HashMap<Key, Value>

Retrieve all the values for a given key prefix in a given version. HashMap is empty if no such version or key prefix not exists.

fn latest_version_id(&self) -> Option<V>

Obtain the latest version identifier that has been successfully written.

fn contains(&self, version_id: &V, key: Key) -> bool