Enum XNackMode 

#[non_exhaustive]
pub enum XNackMode {
    Silent,
    Fail,
    Fatal,
}

How xnack adjusts the delivery counter of the released messages.

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.

Silent

Decrement the counter by one, undoing the delivery that just failed. For a graceful shutdown or an internal consumer failure, where the delivery should not count against the message.

Fail

Leave the counter as it is. For when this consumer could not process the message and it is unclear whether the message or the consumer is at fault, so another consumer should get a turn.

Fatal

Set the counter to its maximum, marking the message permanently failed. For invalid or suspected malicious messages.

Trait Implementations

impl Serialize for XNackMode

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

where __S: Serializer,

Serialize this value into the given Serde serializer.