Struct MultiLevelCache 

pub struct MultiLevelCache { /* private fields */ }

多级缓存（按顺序查询各级缓存）

Implementations

impl MultiLevelCache

pub fn new() -> Self

创建空的多级缓存

pub fn add_cache(self, cache: Box<dyn Cache>) -> Self

追加一级缓存

Trait Implementations

impl Cache for MultiLevelCache

fn get(&self, key: &str) -> Result<Option<Vec<u8>>, CacheError>

获取缓存值

fn set( &self, key: &str, value: Vec<u8>, ttl: Option<Duration>, ) -> Result<(), CacheError>

设置缓存值（可指定 TTL）

fn delete(&self, key: &str) -> Result<(), CacheError>

删除缓存键

fn clear(&self) -> Result<(), CacheError>

清空所有缓存

fn exists(&self, key: &str) -> Result<bool, CacheError>

判断键是否存在

fn expire(&self, key: &str, ttl: Duration) -> Result<(), CacheError>

设置键的过期时间

fn ttl(&self, key: &str) -> Result<Option<Duration>, CacheError>

查询键的剩余 TTL

impl Default for MultiLevelCache

fn default() -> Self

Returns the “default value” for a type.