Struct ExtentAllocator 

pub struct ExtentAllocator { /* private fields */ }

Extent allocator for SST heap

Uses a simple bump allocator strategy:

• Allocations always extend the file
• Free space tracking is deferred to compaction

Implementations

impl ExtentAllocator

pub fn new(base_offset: u64) -> Self

Create a new allocator

pub fn allocate(&self, size: u64) -> Result<Extent>

Allocate a new extent with the given size (in bytes)

pub fn free(&self, id: ExtentId) -> Result<()>

Free an extent (mark for future compaction)

pub fn get(&self, id: ExtentId) -> Option<Extent>

Get an extent by ID

pub fn allocated_size(&self) -> u64

Get total allocated size (in bytes)

pub fn num_extents(&self) -> usize

Get number of allocated extents

pub fn list_extents(&self) -> Vec<Extent>

List all allocated extents