Trait ethcore::db::Readable
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[src]
pub trait Readable { fn read<T, R>(&self, col: Option<u32>, key: &Key<T, Target=R>) -> Option<T> where T: Decodable, R: Deref<Target=[u8]>; fn exists<T, R>(&self, col: Option<u32>, key: &Key<T, Target=R>) -> bool where R: Deref<Target=[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 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: Deref<Target=[u8]>, C: Cache<K, T> { ... } }
Should be used to read values from database.
Required Methods
fn read<T, R>(&self, col: Option<u32>, key: &Key<T, Target=R>) -> Option<T> where T: Decodable, R: Deref<Target=[u8]>
Returns value for given key.
fn exists<T, R>(&self, col: Option<u32>, key: &Key<T, Target=R>) -> bool where R: Deref<Target=[u8]>
Returns true if given value exists.
Provided Methods
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>
col: Option<u32>,
cache: &RwLock<C>,
key: &K)
-> Option<T> where K: Key<T> + Eq + Hash + Clone, T: Clone + Decodable, C: Cache<K, T>
Returns value for given key either in cache or in database.
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: Deref<Target=[u8]>, C: Cache<K, T>
col: Option<u32>,
cache: &RwLock<C>,
key: &K)
-> bool where K: Eq + Hash + Key<T, Target=R>, R: Deref<Target=[u8]>, C: Cache<K, T>
Returns true if given value exists either in cache or in database.
Implementors
impl Readable for Database