Struct BlockCacheLifecycle 

pub struct BlockCacheLifecycle;

Lifecycle hooks for the block cache that prevent eviction of entries still referenced outside the cache (i.e., with Arc strong count > 1).

Trait Implementations

impl Clone for BlockCacheLifecycle

fn clone(&self) -> BlockCacheLifecycle

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Default for BlockCacheLifecycle

fn default() -> BlockCacheLifecycle

Returns the “default value” for a type.

impl Lifecycle<(u32, u16), ArcBytes> for BlockCacheLifecycle

type RequestState = ()

fn is_pinned(&self, _key: &(u32, u16), val: &ArcBytes) -> bool

Returns whether the item is pinned. Items that are pinned can’t be evicted. Note that a pinned item can still be replaced with get_mut, insert, replace and similar APIs.

fn begin_request(&self) -> Self::RequestState

Called before the insert request starts, e.g.: insert, replace.

fn on_evict( &self, _state: &mut Self::RequestState, _key: (u32, u16), _val: ArcBytes, )

Called when an item is evicted.

fn before_evict(&self, state: &mut Self::RequestState, key: &Key, val: &mut Val)

Called when a cache item is about to be evicted. Note that value replacement (e.g. insertions for the same key) won’t call this method.

fn end_request(&self, state: Self::RequestState)

Called after a request finishes, e.g.: insert, replace.