Enum ReadGuard 

pub enum ReadGuard {
    ExpectedVersion {
        key: Key,
        read_ts: Timestamp,
        expected_commit_ts: Option<Timestamp>,
    },
    ExpectedValue {
        key: Key,
        read_ts: Timestamp,
        expected_value: Option<Value>,
    },
}

A precondition guard evaluated against the MVCC state before applying a guarded batch.

Variants

ExpectedVersion

Guard based on an expected specific version (commit timestamp).

Fields

key: Key

The key to check.

read_ts: Timestamp

The read timestamp at which to evaluate the guard.

expected_commit_ts: Option<Timestamp>

The exact commit_ts expected, or None if expecting absence.

ExpectedValue

Guard based on an expected logical value.

Fields

key: Key

The key to check.

read_ts: Timestamp

The read timestamp at which to evaluate the guard.

expected_value: Option<Value>

The exact value expected, or None if expecting logical absence.

Trait Implementations

impl Clone for ReadGuard

fn clone(&self) -> ReadGuard

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ReadGuard

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

Formats the value using the given formatter.

impl Eq for ReadGuard

impl PartialEq for ReadGuard

fn eq(&self, other: &ReadGuard) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ReadGuard