Struct mz_persist::mem::MemConsensus

pub struct MemConsensus {
    data: Arc<Mutex<BTreeMap<String, Vec<VersionedData>>>>,
}

An in-memory implementation of Consensus.

Fields

data: Arc<Mutex<BTreeMap<String, Vec<VersionedData>>>>

Implementations

impl MemConsensus

fn scan_store( store: &BTreeMap<String, Vec<VersionedData>>, key: &str, from: SeqNo, limit: usize, ) -> Result<Vec<VersionedData>, ExternalError>

Trait Implementations

impl Consensus for MemConsensus

fn list_keys(&self) -> ResultStream<'_, String>

Returns all the keys ever created in the consensus store.

fn head<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<Option<VersionedData>, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Returns a recent version of data, and the corresponding sequence number, if one exists at this location.

fn compare_and_set<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, expected: Option<SeqNo>, new: VersionedData, ) -> Pin<Box<dyn Future<Output = Result<CaSResult, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Update the VersionedData stored at this location to new, iff the current sequence number is exactly expected and new’s sequence number > the current sequence number.

fn scan<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, from: SeqNo, limit: usize, ) -> Pin<Box<dyn Future<Output = Result<Vec<VersionedData>, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Return limit versions of data stored for this key at sequence numbers >= from, in ascending order of sequence number.

fn truncate<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, seqno: SeqNo, ) -> Pin<Box<dyn Future<Output = Result<usize, ExternalError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Deletes all historical versions of the data stored at key that are < seqno, iff seqno <= the current sequence number.

impl Debug for MemConsensus

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for MemConsensus

fn default() -> Self

Returns the “default value” for a type.