Enum AckingBehavior 

pub enum AckingBehavior {
    Manual,
    Auto,
}

Defines how the consumed messages are acknowledged: explicitly or implicitly.

If transactional message handling is required, it is highly recommended to use the manual mode, as otherwise it is quite possible to lose messages.

Variants

Manual

Messages must be explicitly acknowledged by the application logic.

This is the recommended mode for transactional message handling: a message will not be removed from the queue until its [Envelope] is explicitly finalized. This, however, means that some messages may end up being processed more than once. Thus, this mode provides the at-least-once message processing semantics.

Auto

Messages are implicitly pre-acknowledged by the server on delivery, before even reaching the application logic.

This mode will cause missed messages on consumption! Some messages may occasionally fall through the cracks before being handed to the consuming logic, and since the messages are implicitly pre-acknowledged — such messages will not be re-delivered or seen again.

If it is important to process each message no more than once, but occasional message loss is acceptable — this is the mode of choice.

For transactional handling with at-least-once semantics, use the manual mode.

This mode effectively disables the prefetch. The prefetch count refers to the count of unacknowledged messages pre-delivered to a consumer, and with implicit auto-acking there are no unacknowledged messages at all.

Trait Implementations

impl Clone for AckingBehavior

fn clone(&self) -> AckingBehavior

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AckingBehavior

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for AckingBehavior

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for AckingBehavior

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for AckingBehavior

fn cmp(&self, other: &AckingBehavior) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for AckingBehavior

fn eq(&self, other: &AckingBehavior) -> 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 PartialOrd for AckingBehavior

fn partial_cmp(&self, other: &AckingBehavior) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for AckingBehavior

impl Eq for AckingBehavior

impl StructuralPartialEq for AckingBehavior