Struct DeadLetterModel 

pub struct DeadLetterModel { /* private fields */ }

Learned dead letter retry policy replacing fixed backoff and discard rules.

Inputs (3): retry_count, message_age_ms, queue_depth Outputs (2): retry_delay_ms, should_discard (>0.5 = discard)

Fallback: retry_delay = 1000 * 2^retry_count (capped at 60s), discard after 5 retries.

Implementations

impl DeadLetterModel

pub fn new() -> Self

Create a new untrained dead letter policy model.

pub fn drain_events(&mut self) -> Vec<EmlEvent>

Drain accumulated EML lifecycle events for ExoChain forwarding.

pub fn is_trained(&self) -> bool

Whether the model has been trained.

pub fn training_sample_count(&self) -> usize

Number of training samples collected.

pub fn predict( &self, retry_count: u32, message_age_ms: u64, queue_depth: usize, ) -> (u64, bool)

Predict retry policy: (retry_delay_ms, should_discard).

When untrained, uses exponential backoff: 1000 * 2^retry_count capped at 60s, discards after 5 retries.

pub fn record( &mut self, retry_count: u32, message_age_ms: u64, queue_depth: usize, actual_delay_ms: u64, delivery_succeeded: bool, )

Record a retry outcome for training.

delivery_succeeded: whether the retry eventually delivered. actual_delay_ms: the delay used before the retry attempt.

pub fn train(&mut self) -> bool

Train the model from recorded samples.

Trait Implementations

impl Clone for DeadLetterModel

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DeadLetterModel

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

Formats the value using the given formatter.

impl Default for DeadLetterModel

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for DeadLetterModel

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for DeadLetterModel

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.