Struct FileRangeSource 

pub struct FileRangeSource { /* private fields */ }

A file-backed ExpertSource: each expert is one contiguous (offset, len) byte range in a single file, read with positional reads (pread-style on unix, so concurrent misses never contend on a shared seek cursor). This is the portable buffered-I/O default the storage design starts from; O_DIRECT/F_NOCACHE/io_uring variants are future work behind the same trait and must produce identical bytes.

Implementations

impl FileRangeSource

pub fn new(file: File, ranges: HashMap<ExpertKey, (u64, usize)>) -> Self

Trait Implementations

impl ExpertSource for FileRangeSource

fn expert_len(&self, key: ExpertKey) -> Option<usize>

The exact byte length of this expert, or None if the key does not exist. Used for budget accounting before reading.

fn read_expert(&self, key: ExpertKey) -> Result<Vec<u8>>

Reads this expert’s complete bytes.