Enum StreamNackMode 

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

Mode for the xnack command.

Selects how the server adjusts the per-message delivery counter when a consumer NACKs (negatively acknowledges) one or more pending messages. See xnack for the full PEL semantics (re-ordering, ownership reset).

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

The consumer is NACKing due to internal errors or shutdown, not because the message itself is problematic. The delivery counter of each specified message is decremented by 1.

Fail

The message causes problems for this consumer but may succeed for other consumers. The delivery counter is left unchanged.

Fatal

The message is malformed/poison-pill/suspected-malicious. The delivery counter is pinned to a sentinel value (i64::MAX) that survives subsequent re-deliveries, so the message remains identifiable as previously-FATAL for downstream tooling.

Trait Implementations

impl Clone for StreamNackMode

fn clone(&self) -> StreamNackMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for StreamNackMode

impl Debug for StreamNackMode

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

Formats the value using the given formatter.

impl Eq for StreamNackMode

impl PartialEq for StreamNackMode

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for StreamNackMode

impl ToRedisArgs for StreamNackMode

Available on crate feature streams only.

fn write_redis_args<W>(&self, out: &mut W)

where W: ?Sized + RedisWrite,

This writes the value into a vector of bytes. Each item is a single argument. Most items generate a single item.

fn to_redis_args(&self) -> Vec<Vec<u8>>

This converts the value into a vector of bytes. Each item is a single argument. Most items generate a vector of a single item.

fn describe_numeric_behavior(&self) -> NumericBehavior

Returns an information about the contained value with regards to it’s numeric behavior in a redis context. This is used in some high level concepts to switch between different implementations of redis functions (for instance INCR vs INCRBYFLOAT).

fn num_of_args(&self) -> usize

Returns the number of arguments this value will generate.

impl ToSingleRedisArg for StreamNackMode

Available on crate feature streams only.