marque_engine/
clock.rs

1//! Clock abstraction for deterministic timestamps in audit records.
2//!
3//! `Engine` uses `dyn Clock` exclusively for `AppliedFix::timestamp`.
4//! Production code injects `SystemClock`; tests inject `FixedClock`
5//! so snapshot tests of audit NDJSON are deterministic.
6
7use std::time::SystemTime;
8
9/// Abstraction over `SystemTime::now()` for testability.
10pub trait Clock: Send + Sync {
11    fn now(&self) -> SystemTime;
12}
13
14/// Production clock — delegates to `SystemTime::now()`.
15pub struct SystemClock;
16
17impl Clock for SystemClock {
18    fn now(&self) -> SystemTime {
19        SystemTime::now()
20    }
21}
22
23/// Test clock — always returns the same instant.
24pub struct FixedClock(SystemTime);
25
26impl FixedClock {
27    /// Construct a fixed clock that always returns `instant`.
28    pub const fn new(instant: SystemTime) -> Self {
29        Self(instant)
30    }
31}
32
33impl Clock for FixedClock {
34    fn now(&self) -> SystemTime {
35        self.0
36    }
37}
marque_engine/clock.rs

marque_engine/
clock.rs
