Enum QoS

#[repr(u8)]
pub enum QoS {
    AtMostOnce = 0,
    AtLeastOnce = 1,
    ExactlyOnce = 2,
}

Quality of Service levels for message delivery

Determines the guarantee of message delivery between client and broker

Variants

AtMostOnce = 0

At most once delivery (Fire and Forget)

Example

Used for non-critical sensor data where occasional loss is acceptable

AtLeastOnce = 1

At least once delivery (Acknowledged Delivery)

Example

Used for important notifications that must be received but can tolerate duplicates

ExactlyOnce = 2

Exactly once delivery (Assured Delivery)

Example

Used for critical commands where duplication could cause harmful effects

Implementations

impl QoS

pub fn value(&self) -> u8

Gets the numeric value of the QoS level

pub fn less_value(&self, qos: QoS) -> QoS

Returns the lower of two QoS levels

Example

use rmqtt_codec::types::QoS;

let lower = QoS::ExactlyOnce.less_value(QoS::AtLeastOnce);
assert_eq!(lower, QoS::AtLeastOnce);

Trait Implementations

impl Clone for QoS

fn clone(&self) -> QoS

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for QoS

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for QoS

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<QoS> for u8

fn from(v: QoS) -> Self

Converts to this type from the input type.

impl Hash for QoS

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 QoS

fn cmp(&self, other: &QoS) -> 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 QoS

fn eq(&self, other: &QoS) -> 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 QoS

fn partial_cmp(&self, other: &QoS) -> 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 Serialize for QoS

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TryFrom<u8> for QoS

type Error = DecodeError

The type returned in the event of a conversion error.

fn try_from(v: u8) -> Result<Self, Self::Error>

Performs the conversion.

impl Copy for QoS

impl Eq for QoS

impl StructuralPartialEq for QoS