Struct MvccVersion 

pub struct MvccVersion {
    pub xmin: u64,
    pub xmax: u64,
    pub created_ts: u64,
    pub deleted_ts: u64,
    pub value: Vec<u8>,
}

Version of a value with MVCC metadata

Fields

xmin: u64

Transaction that created this version

xmax: u64

Transaction that deleted this version (0 if active)

created_ts: u64

Creation timestamp

deleted_ts: u64

Deletion timestamp (MAX if active)

value: Vec<u8>

The actual value

Implementations

impl MvccVersion

pub fn new(xmin: u64, created_ts: u64, value: Vec<u8>) -> Self

Create a new active version

pub fn mark_deleted(&mut self, xmax: u64, deleted_ts: u64)

Mark as deleted

pub fn is_visible( &self, snapshot_ts: u64, txn_id: u64, committed_txns: &HashMap<u64, u64>, ) -> bool

Check if visible to a snapshot (legacy HashMap version)

pub fn is_visible_dashmap( &self, snapshot_ts: u64, txn_id: u64, committed_txns: &DashMap<u64, u64>, ) -> bool

Check if visible to a snapshot (DashMap version for concurrent access)

Trait Implementations

impl Clone for MvccVersion

fn clone(&self) -> MvccVersion

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MvccVersion

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

Formats the value using the given formatter.