Struct VisibilityContext 

pub struct VisibilityContext {
    pub reader_txn_id: TxnId,
    pub snapshot_ts: Timestamp,
    pub active_txn_ids: HashSet<TxnId>,
}

Version visibility context

Provides the information needed to determine if a version is visible to a particular reader/transaction.

Fields

reader_txn_id: TxnId

Reader’s transaction ID

snapshot_ts: Timestamp

Reader’s snapshot timestamp

active_txn_ids: HashSet<TxnId>

Set of transaction IDs that are still active (not committed)

Implementations

impl VisibilityContext

pub fn new(reader_txn_id: TxnId, snapshot_ts: Timestamp) -> Self

Create a new visibility context

pub fn with_active_txns( reader_txn_id: TxnId, snapshot_ts: Timestamp, active_txn_ids: HashSet<TxnId>, ) -> Self

Create with active transaction set

pub fn is_committed_before( &self, txn_id: TxnId, commit_ts: Option<Timestamp>, ) -> bool

Check if a transaction was committed before this snapshot

Trait Implementations

impl Clone for VisibilityContext

fn clone(&self) -> VisibilityContext

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for VisibilityContext

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

Formats the value using the given formatter.