Struct MemoryCappedHashmap

pub struct MemoryCappedHashmap { /* private fields */ }

Available on crate feature pack-cache-lru-dynamic and (crate features pack-cache-lru-dynamic or pack-cache-lru-static) only.

An LRU cache with hash map backing and an eviction rule based on the memory usage for object data in bytes.

Implementations

impl MemoryCappedHashmap

pub fn new(memory_cap_in_bytes: usize) -> MemoryCappedHashmap

Return a new instance which evicts least recently used items if it uses more than memory_cap_in_bytes object data.

Trait Implementations

impl DecodeEntry for MemoryCappedHashmap

fn put( &mut self, pack_id: u32, offset: u64, data: &[u8], kind: Kind, compressed_size: usize, )

Store a fully decoded object at offset of kind with compressed_size and data in the cache.

fn get( &mut self, pack_id: u32, offset: u64, out: &mut Vec<u8>, ) -> Option<(Kind, usize)>

Attempt to fetch the object at offset and store its decoded bytes in out, as previously stored with DecodeEntry::put(), and return its (object kind, decompressed_size)