Trait Query 

pub trait Query: Send + 'static {
    // Required methods
    fn to_bytes(&self) -> Result<Vec<u8>, CodecError>;
    fn from_bytes(bytes: &[u8]) -> Result<Self, CodecError>
       where Self: Sized;
}

A read-only query served by the StateMachine.

Queries never enter the log; they are answered locally after the ReadIndex protocol confirms the leader is current (read-consistency). They still cross task boundaries and may be sent to a remote leader, hence Send + 'static + serde. Unlike a Command, a query need not be Clone.

Required Methods

fn to_bytes(&self) -> Result<Vec<u8>, CodecError>

Encode this query to postcard bytes for the wire.

Errors

Returns CodecError if serialization fails.

fn from_bytes(bytes: &[u8]) -> Result<Self, CodecError>

where Self: Sized,

Decode a query from postcard bytes.

Errors

Returns CodecError if deserialization fails.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<T> Query for T

where T: Send + 'static + Serialize + DeserializeOwned,