Enum Role 

pub enum Role {
    Primary,
    Replica,
    Cache,
    Archive,
}

链路角色：读解析时决定链路的优先级层级（Primary 最高）。 仅在 store.config.json 的 links 声明中出现，禁写入 schema 定义文件。

Variants

Primary

主链路：读路径的默认选中落点

Replica

从链路：主不可用时的备选

Cache

缓存链路

Archive

归档链路

Implementations

impl Role

pub fn parse(s: &str) -> Result<Role, String>

非法字符串 ⇒ Err（禁静默回落）

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

pub fn rank(&self) -> u8

排序键：Primary=0, Replica=1, Cache=2, Archive=3

Trait Implementations

impl Clone for Role

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Role

impl Debug for Role

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

Formats the value using the given formatter.

impl Eq for Role

impl PartialEq for Role

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Role