Trait ethcore_db::Readable

source · [−]
pub trait Readable {
    fn read<T, R>(
        &self, 
        col: Option<u32>, 
        key: &dyn Key<T, Target = R>
    ) -> Option<T>
    where
        T: Decodable,
        R: AsRef<[u8]>;

    fn exists<T, R>(
        &self, 
        col: Option<u32>, 
        key: &dyn Key<T, Target = R>
    ) -> bool
    where
        R: AsRef<[u8]>;

    fn read_with_cache<K, T, C>(
        &self, 
        col: Option<u32>, 
        cache: &RwLock<C>, 
        key: &K
    ) -> Option<T>
    where
        K: Key<T> + Eq + Hash + Clone,
        T: Clone + Decodable,
        C: Cache<K, T>,
    { ... }

    fn read_with_two_layer_cache<K, T, C>(
        &self, 
        col: Option<u32>, 
        l1_cache: &RwLock<C>, 
        l2_cache: &RwLock<C>, 
        key: &K
    ) -> Option<T>
    where
        K: Key<T> + Eq + Hash + Clone,
        T: Clone + Decodable,
        C: Cache<K, T>,
    { ... }

    fn exists_with_cache<K, T, R, C>(
        &self, 
        col: Option<u32>, 
        cache: &RwLock<C>, 
        key: &K
    ) -> bool
    where
        K: Eq + Hash + Key<T, Target = R>,
        R: AsRef<[u8]>,
        C: Cache<K, T>,
    { ... }
}
Expand description

Should be used to read values from database.

Required methods

Returns value for given key.

Returns true if given value exists.

Provided methods

Returns value for given key either in cache or in database.

Returns value for given key either in two-layered cache or in database.

Returns true if given value exists either in cache or in database.

Implementors