Struct DisabledCacheManager 

pub struct DisabledCacheManager;

A CacheManager that caches nothing.

Every CacheManager::get returns 0 (miss) and every CacheManager::put returns false. Used as the implementation when the cache is disabled, and as a safe fallback when initialization fails.

Trait Implementations

impl CacheManager for DisabledCacheManager

fn put<'life0, 'life1, 'async_trait>( &'life0 self, _page_id: &'life1 PageId, _page: Bytes, ) -> Pin<Box<dyn Future<Output = bool> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Store (fill) a whole page.

fn schedule_fill(self: Arc<Self>, _page_id: PageId, _page: Bytes)

Schedule a best-effort cache fill that does not block the caller.

fn get<'life0, 'life1, 'life2, 'async_trait>( &'life0 self, _page_id: &'life1 PageId, _page_offset: usize, _dst: &'life2 mut [u8], ) -> Pin<Box<dyn Future<Output = usize> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait,

Read dst.len() bytes from page page_id starting at page_offset into dst.

fn delete<'life0, 'life1, 'async_trait>( &'life0 self, _page_id: &'life1 PageId, ) -> Pin<Box<dyn Future<Output = bool> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Delete a single page. Returns true if a page was removed.

fn invalidate<'life0, 'life1, 'async_trait>( &'life0 self, _file_id: &'life1 str, ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Invalidate all cached pages belonging to file_id.

fn state(&self) -> CacheState

Current operational state.

fn get_bytes<'life0, 'life1, 'async_trait>( &'life0 self, page_id: &'life1 PageId, page_offset: usize, len: usize, ) -> Pin<Box<dyn Future<Output = Bytes> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Read bytes from a cached page and return the owned Bytes directly.

fn get_batch_bytes<'life0, 'life1, 'async_trait>( &'life0 self, requests: &'life1 [PageReadRequest], ) -> Pin<Box<dyn Future<Output = Vec<Bytes>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Read multiple cached pages. Each output corresponds to the request at the same index; an empty Bytes means miss or cache error.

fn on_file_open<'life0, 'life1, 'async_trait>( &'life0 self, _file_id: &'life1 str, _length: i64, _last_modification_time_ms: i64, ) -> Pin<Box<dyn Future<Output = ()> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Notify the cache that a file was (re)opened with the given identity.

impl Clone for DisabledCacheManager

fn clone(&self) -> DisabledCacheManager

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DisabledCacheManager

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

Formats the value using the given formatter.

impl Default for DisabledCacheManager

fn default() -> DisabledCacheManager

Returns the “default value” for a type.