Struct DefaultFilesMetadataCacheState 

struct DefaultFilesMetadataCacheState {
    lru_queue: LruQueue<Path, (ObjectMeta, Arc<dyn FileMetadata>)>,
    memory_limit: usize,
    memory_used: usize,
    cache_hits: HashMap<Path, usize>,
}

Handles the inner state of the DefaultFilesMetadataCache struct.

Fields

lru_queue: LruQueue<Path, (ObjectMeta, Arc<dyn FileMetadata>)>

memory_limit: usize

memory_used: usize

cache_hits: HashMap<Path, usize>

Implementations

impl DefaultFilesMetadataCacheState

fn new(memory_limit: usize) -> Self

fn get(&mut self, k: &ObjectMeta) -> Option<Arc<dyn FileMetadata>>

Returns the respective entry from the cache, if it exists and the size and last_modified properties from [ObjectMeta] match. If the entry exists, it becomes the most recently used.

fn contains_key(&self, k: &ObjectMeta) -> bool

Checks if the metadata is currently cached (entry exists and the size and last_modified properties of [ObjectMeta] match). The LRU queue is not updated.

fn put( &mut self, key: ObjectMeta, value: Arc<dyn FileMetadata>, ) -> Option<Arc<dyn FileMetadata>>

Adds a new key-value pair to cache, meaning LRU entries might be evicted if required. If the key is already in the cache, the previous metadata is returned. If the size of the metadata is greater than the memory_limit, the value is not inserted.

fn evict_entries(&mut self)

Evicts entries from the LRU cache until memory_used is lower than memory_limit.

fn remove(&mut self, k: &ObjectMeta) -> Option<Arc<dyn FileMetadata>>

Removes an entry from the cache and returns it, if it exists.

fn len(&self) -> usize

Returns the number of entries currently cached.

fn clear(&mut self)

Removes all entries from the cache.