Struct LockRequest 

pub struct LockRequest {
    pub txn_id: u64,
    pub mode: LockMode,
    pub deadline: Option<Instant>,
    pub control: ExecutionControl,
    pub priority: Option<u64>,
}

One lock acquisition request.

The four fields the spec’s wait queue carries — transaction ID, deadline, cancellation control, lock mode — are all here; priority is victim-selection input and never enters the queue itself.

Fields

txn_id: u64

The requesting transaction. u64 today; see the module docs for the 128-bit mongreldb_types::ids::TransactionId migration note.

mode: LockMode

The requested mode.

deadline: Option<Instant>

Optional lock-wait deadline, independent of any deadline inside control. Expiry fails the wait with LockError::DeadlineExceeded.

control: ExecutionControl

Cooperative cancellation control; cancelling it fails the wait with LockError::Cancelled (or LockError::DeadlineExceeded when the control’s own deadline fired first), observed within [CANCELLATION_POLL_INTERVAL].

priority: Option<u64>

Optional deadlock-victim priority: within one wait-for cycle the lowest priority value dies first, ties break by youngest transaction. None is [DEFAULT_PRIORITY].

Implementations

impl LockRequest

pub fn new(txn_id: u64, mode: LockMode, control: ExecutionControl) -> Self

A request with no lock-wait deadline and no explicit priority.

pub fn with_deadline(self, deadline: Instant) -> Self

Sets the lock-wait deadline.

pub fn with_timeout(self, timeout: Duration) -> Self

Sets the lock-wait deadline relative to now. Overflowing timeouts collapse to an already-expired deadline (fail closed), matching ExecutionControl::with_timeout.

pub fn with_priority(self, priority: u64) -> Self

Sets the deadlock-victim priority (lower values die first).

Trait Implementations

impl Clone for LockRequest

fn clone(&self) -> LockRequest

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LockRequest

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

Formats the value using the given formatter.