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Query

hexeract_core::query

Trait Query 

Source 
pub trait Query:
    Send
    + Sync
    + 'static {
    type Output: Send + Sync + 'static;
}
Expand description

A read-only message asking for information.

Each query has exactly one QueryHandler. Unlike a Command, a query must not mutate observable state. The framework treats both with the same machinery, but the distinction is encouraged for clarity.

§Example

use hexeract_core::Query;
use uuid::Uuid;

struct FindUserById {
    pub id: Uuid,
}

struct User {
    pub id: Uuid,
    pub email: String,
}

impl Query for FindUserById {
    type Output = Option<User>;
}

Required Associated Types§

Source

type Output: Send + Sync + 'static

The result type returned by the handler upon successful execution.

Dyn Compatibility§

This trait is dyn compatible.

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

Implementors§