Struct VersionChain 

pub struct VersionChain { /* private fields */ }

MVCC version chain for a key

Implementations

impl VersionChain

pub fn new() -> Self

Create a new version chain

pub fn add_version(&mut self, version: VersionedValue)

Add a new version (inserts at front)

pub fn get_visible( &self, snapshot_ts: Timestamp, current_txn_id: TransactionId, ) -> Option<Vec<u8>>

Get the visible version for a transaction

pub fn commit_transaction(&mut self, txn_id: TransactionId)

Mark all versions created by a transaction as committed

pub fn rollback_transaction(&mut self, txn_id: TransactionId)

Remove all versions created by a transaction (for rollback)

pub fn gc(&mut self, min_active_ts: Timestamp)

Garbage collect versions older than the oldest active snapshot

Trait Implementations

impl Clone for VersionChain

fn clone(&self) -> VersionChain

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VersionChain

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

Formats the value using the given formatter.

impl Default for VersionChain

fn default() -> Self

Returns the “default value” for a type.