Enum LockMode 

pub enum LockMode {
    Exclusive,
    Shared,
    Snapshot,
}

What a lock leaves other transactions able to do.

Variants

Exclusive

Nobody else may write to the node, and nobody else may take this lock.

What a writer takes, and what the cluster takes on your behalf when you write. Two transactions asking for it is the conflict worth designing around: the loser is told which transaction won.

Shared

Others may take this lock too; nobody may take an exclusive one.

Several writers of different parts of a node — different children of a map node, different attributes — rather than several writers of the same thing.

Snapshot

Pins the node as it is now, for this transaction to read.

Compatible with somebody else’s exclusive lock: they carry on writing, and this transaction goes on seeing the version it pinned. What a long read of a table that others keep replacing wants.

Implementations

impl LockMode

pub fn as_str(self) -> &'static str

The spelling the cluster expects.

Trait Implementations

impl Clone for LockMode

fn clone(&self) -> LockMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LockMode

impl Debug for LockMode

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

Formats the value using the given formatter.

impl Eq for LockMode

impl PartialEq for LockMode

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LockMode