Trait MutatorMiddleware 

pub trait MutatorMiddleware<Evt>: Send + Sync {
    // Required methods
    fn name(&self) -> &str;
    fn process(&self, event: Evt) -> MutatorAction<Evt>;
}

可变处理器——接收 Evt，选择放行/修改/阻止。

与 InspectorMiddleware 不同，mutator 在事件流程中同步顺序执行， 其返回的 MutatorAction 直接决定事件是否继续传递。

示例

struct Censor;
impl MutatorMiddleware<String> for Censor {
    fn name(&self) -> &str { "censor" }
    fn process(&self, event: String) -> MutatorAction<String> {
        if event.contains("bad") {
            MutatorAction::Modify(event.replace("bad", "***"))
        } else {
            MutatorAction::Block { reason: "contains bad word".into() }
        }
    }
}

Required Methods

fn name(&self) -> &str

返回此 mutator 的唯一标识名称。

fn process(&self, event: Evt) -> MutatorAction<Evt>

处理事件。支持三种决策：

• MutatorAction::Pass：放行，事件不变
• MutatorAction::Modify：替换事件
• MutatorAction::Block：阻止后续传递

Dyn Compatibility

This trait is dyn compatible.

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

Implementors