Struct MetaFile 

pub struct MetaFile { /* private fields */ }

Safety

entries must be declared before backing so every borrowed FilterRef is dropped before its stable mmap or heap storage.

Implementations

impl MetaFile

pub fn open( db_path: &Path, sequence_number: u32, family_configs: Option<&[FamilyConfig]>, access_mode: AccessMode, ) -> Result<Self>

Opens a meta file using mmap or stable heap bytes according to access_mode.

pub fn clear_cache(&mut self)

pub fn prepare_sst_cache(&self)

pub fn sequence_number(&self) -> u32

pub fn family(&self) -> u32

pub fn compression(&self) -> Compression

pub fn byte_size(&self) -> u64

The on-disk size of this meta file in bytes (the length of its memory map).

pub fn entries(&self) -> &[MetaEntry]

pub fn hash_ranges(&self) -> &[StaticSortedFileRange]

The hash ranges of this file’s entries, in the same order as Self::entries.

pub fn hash_range(&self, index: u32) -> StaticSortedFileRange

The hash range of the entry at index.

pub fn range(&self, index: u32) -> StaticSortedFileRange

The key family and hash range of the entry at index.

pub fn entry(&self, index: u32) -> &MetaEntry

pub fn amqf_data(&self) -> &[u8]

pub fn deserialize_used_key_hashes_amqf(&self) -> Result<Option<FilterRef<'_>>>

pub fn retain_entries(&mut self, predicate: impl FnMut(u32) -> bool) -> bool

pub fn obsolete_entries(&self) -> &[u32]

pub fn obsolete_sst_files(&self) -> &[u32]

pub fn lookup<K: QueryKey, const FIND_ALL: bool>( &self, key_family: u32, key_hash: u64, key: &K, key_block_cache: &BlockCache, value_block_cache: &BlockCache, ) -> Result<MetaLookupResult>

Looks up a key in this meta file.

If FIND_ALL is false, returns after finding the first match. If FIND_ALL is true, returns all entries with the same key from all SST files (useful for keyspaces where keys are hashes and collisions are possible).

pub fn batch_lookup<K: QueryKey>( &self, key_family: u32, keys: &[K], cells: &mut [(u64, usize, Option<LookupValue>)], empty_cells: &mut usize, key_block_cache: &BlockCache, value_block_cache: &BlockCache, ) -> Result<MetaBatchLookupResult>