Struct PressureEngine 

pub struct PressureEngine { /* private fields */ }

Derives the Pressure Radar from a stream of snapshots (§2.3).

Stateful on purpose: hysteresis is memory, and §11.3 requires it. The state is bounded — one fixed-length observation window per signal — so a twelve-hour run occupies exactly as much as the first minute (§16.1).

Implementations

impl PressureEngine

pub fn new(thresholds: Thresholds) -> Self

Builds an engine from configuration, sanitizing it first.

pub const fn thresholds(&self) -> &Thresholds

The sanitized thresholds in effect.

pub fn set_thresholds(&mut self, thresholds: Thresholds)

Replaces the thresholds, discarding hysteresis state.

§12 makes configuration reload atomic. The observations already collected were judged against the old thresholds, so keeping them would let a reload produce a state that neither configuration justifies; a reset is the honest answer and costs one warm-up period.

pub fn reset(&mut self)

Discards every signal’s hysteresis state (§11.3).

The runtime calls this after anything that breaks the continuity of the measurement stream and that the engine cannot see for itself — a collector restart, for instance. Sleep/wake gaps are detected automatically by Self::observe.

pub const fn observations(&self) -> u64

How many snapshots have been folded into the current state.

pub const fn discontinuities(&self) -> u64

How many measurement discontinuities have been absorbed (§11.3).

Surfaced on the Inspect screen so a user who closed their laptop can see why the radar went back to warming up (§7.5).

pub fn observe(&mut self, snapshot: &SystemSnapshot) -> PressureSnapshot

Folds one snapshot in and returns the radar the UI should render.

The returned snapshot’s psi is the one from snapshot: raw PSI is the collector’s measurement and is passed through unchanged.

Trait Implementations

impl Clone for PressureEngine

fn clone(&self) -> PressureEngine

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PressureEngine

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

Formats the value using the given formatter.

impl Default for PressureEngine

fn default() -> Self

An engine with the §12 default thresholds.