Struct PressureHandler 

pub struct PressureHandler {
    reaction: PressureReaction,
    current_level: Mutex<MemoryPressureLevel>,
}

Memory pressure handler for stratified pools.

Monitors memory pressure levels and triggers configured reactions.

Fields

reaction: PressureReaction

Configured reaction.

current_level: Mutex<MemoryPressureLevel>

Current pressure level.

Implementations

impl PressureHandler

pub fn new(reaction: PressureReaction) -> Self

Create a new pressure handler with the specified reaction.

pub fn no_reaction() -> Self

Create a handler with no reaction.

pub fn shrink_to(target_utilization: f64) -> Self

Create a handler that shrinks to target utilization.

pub fn with_callback<F>(callback: F) -> Self

where F: Fn(MemoryPressureLevel) + Send + Sync + 'static,

Create a handler with a custom callback.

pub fn current_level(&self) -> MemoryPressureLevel

Get the current pressure level.

pub fn on_pressure_change( &self, new_level: MemoryPressureLevel, max_per_bucket: usize, ) -> Option<usize>

Handle a pressure level change.

Returns the number of buffers to retain per bucket (if shrinking).

fn is_higher_pressure( new: MemoryPressureLevel, old: MemoryPressureLevel, ) -> bool

Check if new pressure level is higher than old.

fn pressure_ordinal(level: MemoryPressureLevel) -> u8

Get ordinal value for pressure level comparison.

fn pressure_severity(level: MemoryPressureLevel) -> f64

Get severity factor (0.0 to 1.0) for pressure level.

Trait Implementations

impl Debug for PressureHandler

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

Formats the value using the given formatter.