Struct Page 

pub struct Page {
    pub header: PageHeader,
    pub data: BytesMut,
}

Page - a fixed-size storage unit

Fields

header: PageHeader

Page header

data: BytesMut

Page data (excluding header)

Implementations

impl Page

pub fn new(page_id: PageId, page_type: PageType) -> Self

Create a new empty page

pub fn from_bytes(bytes: &[u8]) -> KernelResult<Self>

Create from raw bytes

pub fn to_bytes(&self) -> Bytes

Serialize to bytes

pub fn page_id(&self) -> PageId

Get page ID

pub fn lsn(&self) -> LogSequenceNumber

Get page LSN

pub fn set_lsn(&mut self, lsn: LogSequenceNumber)

Set page LSN (after modification)

pub fn needs_redo(&self, record_lsn: LogSequenceNumber) -> bool

Check if page needs redo during recovery

Returns true if the page’s LSN is less than the WAL record’s LSN, meaning the WAL record’s changes haven’t been applied yet.

pub fn compute_checksum(&self) -> u32

Compute checksum for the page

pub fn validate_checksum(&self) -> bool

Validate page checksum

pub fn update_checksum(&mut self)

Update checksum before writing to disk