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KafkaBackpressureController

laminar_connectors::kafka::backpressure

Struct KafkaBackpressureController 

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pub struct KafkaBackpressureController { /* private fields */ }
Expand description

Controls consumption rate based on downstream channel fill level.

Uses hysteresis (high/low watermark) to avoid rapid pause/resume oscillation. When the channel fill ratio exceeds the high watermark, consumption pauses. It resumes only when the ratio drops below the low watermark.

Callers must wire the channel_len Arc<AtomicUsize>: increment when sending messages into the downstream channel, decrement when receiving. Without this wiring, fill_ratio() always returns 0.0 and backpressure never triggers.

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impl KafkaBackpressureController

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pub fn new( high_watermark: f64, low_watermark: f64, channel_capacity: usize, channel_len: Arc<AtomicUsize>, ) -> Self

Creates a new backpressure controller.

§Arguments
  • high_watermark - Fill ratio to trigger pause (0.0-1.0)
  • low_watermark - Fill ratio to trigger resume (0.0-1.0)
  • channel_capacity - Maximum channel capacity
  • channel_len - Shared atomic counter of current channel size
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pub fn should_pause(&self) -> bool

Returns true if consumption should be paused.

Triggers when the fill ratio exceeds the high watermark and the controller is not already paused.

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pub fn should_resume(&self) -> bool

Returns true if consumption should resume.

Triggers when the fill ratio drops below the low watermark and the controller is currently paused.

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pub fn set_paused(&mut self, paused: bool)

Sets the paused state.

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pub fn is_paused(&self) -> bool

Returns whether consumption is currently paused.

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pub fn fill_ratio(&self) -> f64

Returns the current channel fill ratio (0.0-1.0).

Trait Implementations§

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impl Debug for KafkaBackpressureController

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

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