Enum DeadLetterReason 

#[non_exhaustive]
pub enum DeadLetterReason {
    ActorStopped,
    Timeout,
    ReplyDropped,
}

Reason why a message became a dead letter.

This enum is marked #[non_exhaustive] to allow adding new variants in future versions without breaking existing code.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

ActorStopped

Actor’s mailbox channel was closed.

This occurs when attempting to send a message to an actor that is no longer running. The actor may have stopped normally via ActorRef::stop or terminated abnormally.

Timeout

A send or ask operation exceeded its timeout.

When using ActorRef::tell_with_timeout or ActorRef::ask_with_timeout, if the message cannot be delivered within the specified duration, it becomes a dead letter.

ReplyDropped

The reply channel was dropped before a response could be sent.

When using ActorRef::ask, the handler may fail or the message processing may be interrupted before sending a reply.

Trait Implementations

impl Clone for DeadLetterReason

fn clone(&self) -> DeadLetterReason

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DeadLetterReason

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

Formats the value using the given formatter.

impl Display for DeadLetterReason

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

Formats the value using the given formatter.

impl PartialEq for DeadLetterReason

fn eq(&self, other: &DeadLetterReason) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for DeadLetterReason

impl Eq for DeadLetterReason

impl StructuralPartialEq for DeadLetterReason