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## ThumbnailCache

# Struct ThumbnailCache

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    pub struct ThumbnailCache {
        config: Arc<Mutex<CacheConfig>>,
        cache_dir: PathBuf,
    }

Expand description

Thumbnail cache with LRU eviction

## Fields§

§ `config: Arc<Mutex<CacheConfig>>` § `cache_dir: PathBuf`

## Implementations§

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### impl ThumbnailCache

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#### pub fn new(app_data_dir: PathBuf, config: CacheConfig) -> Self

Create a new thumbnail cache

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#### fn resolve_in_cache_dir(&self, filename: &str) -> Result<PathBuf, String>

Resolve a cache filename against the cache directory, refusing anything that lands outside it.

`..` is folded away lexically rather than through `canonicalize`, so a file that does not exist yet still resolves — the same approach as `media_server::resolve_path`. `safe_component` should already have made an escape impossible; this is the check at the point of use.

TRACES: | DR-210 | UT-204

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#### pub fn is_enabled(&self) -> bool

Check if caching is enabled

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#### pub async fn get_cached_path( &self, db: Arc<RusqliteService>, item_id: &str, image_type: &str, tag: &str, ) -> Option<PathBuf>

Get cached thumbnail path, or None if not cached Updates last_accessed timestamp for LRU tracking

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#### async fn touch( &self, db: &Arc<RusqliteService>, item_id: &str, image_type: &str, tag: Option<&str>, )

Update `last_accessed` for LRU tracking. When `tag` is `Some`, scope to that exact row; when `None`, touch every row for the item + type.

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#### pub async fn save_thumbnail( &self, db: Arc<RusqliteService>, item_id: &str, image_type: &str, tag: &str, data: &[u8], width: Option<i32>, height: Option<i32>, ) -> Result<PathBuf, String>

Save thumbnail to cache

TRACES: | DR-210 | UT-204

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#### async fn ensure_space( &self, db: Arc<RusqliteService>, needed_bytes: u64, ) -> Result<(), String>

Ensure there’s enough space by evicting LRU items if needed

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#### async fn evict_lru( &self, db: Arc<RusqliteService>, to_free: u64, ) -> Result<(), String>

Evict least recently used items to free up space

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#### pub async fn get_cache_size(&self, db: Arc<RusqliteService>) -> u64

Get current total cache size in bytes

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#### pub async fn get_item_count(&self, db: Arc<RusqliteService>) -> i64

Get count of cached items

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#### pub async fn get_limit(&self, db: Arc<RusqliteService>) -> u64

Get the current cache limit in bytes

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#### pub async fn set_limit( &self, db: Arc<RusqliteService>, limit_bytes: u64, ) -> Result<(), String>

Set the cache limit in bytes

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#### pub async fn clear_cache(&self, db: Arc<RusqliteService>) -> Result<(), String>

Clear all cached thumbnails

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#### pub async fn delete_item( &self, db: Arc<RusqliteService>, item_id: &str, ) -> Result<(), String>

Delete cached thumbnail for a specific item

## Auto Trait Implementations§

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### impl Freeze for ThumbnailCache

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### impl RefUnwindSafe for ThumbnailCache

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### impl Send for ThumbnailCache

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### impl Sync for ThumbnailCache

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### impl Unpin for ThumbnailCache

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### impl UnsafeUnpin for ThumbnailCache

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### impl UnwindSafe for ThumbnailCache

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