Enum SharedCache 

pub enum SharedCache {
    Local(LocalCache),
    Redis(RedisCache),
}

共享缓存——枚举包装所有缓存实现，避免 dyn Cache 的对象安全问题

Variants

Local(LocalCache)

Redis(RedisCache)

Trait Implementations

impl Cache for SharedCache

fn get<'life0, 'life1, 'async_trait, T>( &'life0 self, key: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<Option<T>>> + Send + 'async_trait>>

where T: 'async_trait + DeserializeOwned + Send, Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

读取缓存值，返回 Ok(None) 表示 key 不存在或已过期

fn set<'life0, 'life1, 'life2, 'async_trait, T>( &'life0 self, key: &'life1 str, value: &'life2 T, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where T: 'async_trait + Serialize + Send + Sync, Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

设置缓存（永不过期），值通过 serde_json 序列化

fn set_ex<'life0, 'life1, 'life2, 'async_trait, T>( &'life0 self, key: &'life1 str, value: &'life2 T, ttl_secs: u64, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where T: 'async_trait + Serialize + Send + Sync, Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

设置缓存（指定过期秒数），到期后自动不可见

fn del<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<()>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

删除单个 key（不存在不报错）

fn exists<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<bool>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

检查 key 是否存在且未过期

fn incr<'life0, 'life1, 'async_trait>( &'life0 self, key: &'life1 str, delta: i64, ) -> Pin<Box<dyn Future<Output = Result<i64>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

计数器递增（key 不存在则从 0 开始），返回递增后的值

fn keys<'life0, 'life1, 'async_trait>( &'life0 self, pattern: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<Vec<String>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

获取匹配模式（glob：*/?）的所有 key

fn delete_pattern<'life0, 'life1, 'async_trait>( &'life0 self, pattern: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<u64>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

删除匹配模式的所有 key，返回删除数

fn stats(&self) -> CacheStats

缓存统计信息（内存缓存支持，Redis 返回全零）

impl Clone for SharedCache

fn clone(&self) -> SharedCache

Returns a duplicate of the value.

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

Performs copy-assignment from source.