Struct cached::TimedSizedCache

pub struct TimedSizedCache<K, V> { /* private fields */ }

Timed LRU Cache

Stores a limited number of values, evicting expired and least-used entries. Time expiration is determined based on entry insertion time.. The TTL of an entry is not updated when retrieved.

Note: This cache is in-memory only

Implementations

impl<K: Hash + Eq + Clone, V> TimedSizedCache<K, V>

pub fn with_size_and_lifespan(
    size: usize,
    seconds: u64
) -> TimedSizedCache<K, V>

Creates a new SizedCache with a given size limit and pre-allocated backing data

pub fn with_size_and_lifespan_and_refresh(
    size: usize,
    seconds: u64,
    refresh: bool
) -> TimedSizedCache<K, V>

Creates a new SizedCache with a given size limit and pre-allocated backing data. Also set if the ttl should be refreshed on retrieving

pub fn try_with_size_and_lifespan(
    size: usize,
    seconds: u64
) -> Result<TimedSizedCache<K, V>>

pub fn key_order(&self) -> impl Iterator<Item = &K>

Return an iterator of keys in the current order from most to least recently used. Items passed their expiration seconds will be excluded.

pub fn value_order(&self) -> impl Iterator<Item = &(Instant, V)>

Return an iterator of timestamped values in the current order from most to least recently used. Items passed their expiration seconds will be excluded.

pub fn refresh(&self) -> bool

Returns if the lifetime is refreshed when the value is retrieved

pub fn set_refresh(&mut self, refresh: bool)

Sets if the lifetime is refreshed when the value is retrieved

pub fn get_store(&self) -> &SizedCache<K, (Instant, V)>

Returns a reference to the cache’s store

pub fn flush(&mut self)

Remove any expired values from the cache

Trait Implementations

impl<K: Hash + Eq + Clone, V> Cached<K, V> for TimedSizedCache<K, V>

fn cache_get(&mut self, key: &K) -> Option<&V>

Attempt to retrieve a cached value

fn cache_get_mut(&mut self, key: &K) -> Option<&mut V>

Attempt to retrieve a cached value with mutable access

fn cache_get_or_set_with<F: FnOnce() -> V>(&mut self, key: K, f: F) -> &mut V

Get or insert a key, value pair

fn cache_set(&mut self, key: K, val: V) -> Option<V>

Insert a key, value pair and return the previous value

fn cache_remove(&mut self, k: &K) -> Option<V>

Remove a cached value

fn cache_clear(&mut self)

Remove all cached values. Keeps the allocated memory for reuse.

fn cache_reset(&mut self)

Remove all cached values. Free memory and return to initial state

fn cache_reset_metrics(&mut self)

Reset misses/hits counters

fn cache_size(&self) -> usize

Return the current cache size (number of elements)

fn cache_hits(&self) -> Option<u64>

Return the number of times a cached value was successfully retrieved

fn cache_misses(&self) -> Option<u64>

Return the number of times a cached value was unable to be retrieved

fn cache_capacity(&self) -> Option<usize>

Return the cache capacity

fn cache_lifespan(&self) -> Option<u64>

Return the lifespan of cached values (time to eviction)

fn cache_set_lifespan(&mut self, seconds: u64) -> Option<u64>

Set the lifespan of cached values, returns the old value

impl<K, V> CachedAsync<K, V> for TimedSizedCache<K, V> where
    K: Hash + Eq + Clone + Send, 

fn get_or_set_with<'life0, 'async_trait, F, Fut>(
    &'life0 mut self,
    key: K,
    f: F
) -> Pin<Box<dyn Future<Output = &mut V> + Send + 'async_trait>> where
    V: Send,
    F: FnOnce() -> Fut + Send,
    Fut: Future<Output = V> + Send,
    F: 'async_trait,
    Fut: 'async_trait,
    'life0: 'async_trait,
    Self: 'async_trait, 

fn try_get_or_set_with<'life0, 'async_trait, F, Fut, E>(
    &'life0 mut self,
    key: K,
    f: F
) -> Pin<Box<dyn Future<Output = Result<&mut V, E>> + Send + 'async_trait>> where
    V: Send,
    F: FnOnce() -> Fut + Send,
    Fut: Future<Output = Result<V, E>> + Send,
    F: 'async_trait,
    Fut: 'async_trait,
    E: 'async_trait,
    'life0: 'async_trait,
    Self: 'async_trait, 

impl<K: Clone, V: Clone> Clone for TimedSizedCache<K, V>

fn clone(&self) -> TimedSizedCache<K, V>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<K: Debug, V: Debug> Debug for TimedSizedCache<K, V>

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

Formats the value using the given formatter.