Enum MessageClass 

pub enum MessageClass {
    Event,
    Command,
    Reply,
    State,
    Datagram,
    Stream,
    Snapshot,
    System,
}

Message class (spec section 8.1).

Every Message has exactly one MessageClass, which determines the message’s delivery semantics, retention policy, and client-side handling.

Variants

Event

Business event – a regular message in the publish/subscribe model.

Command

Request-style command – carries a correlation_id and expects a Reply from the peer.

Reply

Command response – the Reply paired with a Command.

State

State message – only the latest value per state_key is retained.

Datagram

High-frequency datagram – loss-tolerant, low-latency (e.g. mouse movement, input state).

Stream

Continuously ordered stream segment – used for AI token streams, file transfers, audio/video frames, etc.

Snapshot

Topic state snapshot – used for fast initialization after reconnection.

System

System control message – used internally by the protocol.

Implementations

impl MessageClass

pub fn as_str(self) -> &'static str

Returns the string representation of the message class (used for serialization and logging).

Trait Implementations

impl Clone for MessageClass

fn clone(&self) -> MessageClass

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MessageClass

impl Debug for MessageClass

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for MessageClass

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for MessageClass

impl Hash for MessageClass

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 PartialEq for MessageClass

fn eq(&self, other: &MessageClass) -> 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 Serialize for MessageClass

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for MessageClass