Struct PreviewCache 

pub struct PreviewCache { /* private fields */ }

Implementations

impl PreviewCache

pub fn load(path: &Path) -> PreviewCache

Load a cache file. Missing, unreadable, corrupt or old-version files yield an empty cache (it is only ever a cache).

pub fn save(&self, path: &Path) -> Result<(), Error>

Atomically write the cache (0600, parent created 0700).

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn get_fresh(&self, e: &CatalogEntry) -> Option<&Preview>

Cached preview if its stamp still matches e’s files.

pub fn stale_count(&self, entries: &[CatalogEntry]) -> usize

How many of entries need a (re)scan.

pub fn refresh( &mut self, dir: &Path, entries: &[CatalogEntry], cancel: &Atomic<bool>, progress: &mut dyn FnMut(usize, usize), ) -> RefreshStats

Bring the cache in line with entries (pass the FULL catalog: ids not in it are pruned). Re-reads only sessions whose (mtime, bytes) changed, on up to 4 worker threads. progress(done, total) is called on the calling thread after each session; cancel stops between sessions, keeping everything finished so far. Blocking — run off the UI thread.

Trait Implementations

impl Clone for PreviewCache

fn clone(&self) -> PreviewCache

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PreviewCache

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

Formats the value using the given formatter.

impl Default for PreviewCache

fn default() -> PreviewCache

Returns the “default value” for a type.