CachingReader

micromegas::analytics::lakehouse::caching_reader

Struct CachingReader

pub struct CachingReader { /* private fields */ }

Expand description

Adds file content caching to object store reads.

This is an internal component used by ParquetReader, not a standalone AsyncFileReader. It only provides get_bytes and get_byte_ranges methods - metadata handling remains in the ParquetReader layer.

Uses a two-level caching strategy:

Local cached_data - avoids global cache lookups within a single reader
Global FileCache - shared across all readers, with thundering herd protection

Implementations§

impl CachingReader

pub fn new( object_store: Arc<dyn ObjectStore>, path: Path, filename: String, file_size: u64, file_cache: Arc<FileCache>, ) -> CachingReader

pub fn last_read_was_cache_hit(&self) -> bool

Returns whether the most recent read operation was served from cache.

pub async fn get_bytes( &mut self, range: Range<u64>, ) -> Result<Bytes, ParquetError>

pub async fn get_byte_ranges( &mut self, ranges: Vec<Range<u64>>, ) -> Result<Vec<Bytes>, ParquetError>

Auto Trait Implementations§

impl !Freeze for CachingReader

impl !RefUnwindSafe for CachingReader

impl Send for CachingReader

impl Sync for CachingReader

impl Unpin for CachingReader

impl !UnwindSafe for CachingReader

Blanket Implementations§

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