pub trait QueryHandler<Q, R>: Send + Sync {
// Required method
fn handle<'life0, 'life1, 'async_trait>(
&'life0 self,
ctx: &'life1 AppContext,
q: Q,
) -> Pin<Box<dyn Future<Output = Result<R, AppError>> + Send + 'async_trait>>
where Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait;
}Expand description
查询处理器(Query Handler)
- 处理具体类型的查询,返回结果对象/类型;
- 建议只读,不修改领域状态,可直接访问读模型或投影。