Struct HeaderNode 

pub struct HeaderNode {
    pub tsn: Tsn,
    pub free_lists_tree_root_id: PageID,
    pub events_tree_root_id: PageID,
    pub tags_tree_root_id: PageID,
    pub next_page_id: PageID,
    pub next_position: Position,
    pub schema_version: u32,
    pub tracking_root_page_id: PageID,
}

Fields

tsn: Tsn

free_lists_tree_root_id: PageID

events_tree_root_id: PageID

tags_tree_root_id: PageID

next_page_id: PageID

next_position: Position

schema_version: u32

On-disk schema version for the header node

tracking_root_page_id: PageID

Implementations

impl HeaderNode

pub fn calc_serialized_size(&self) -> usize

Writes the serialized HeaderNode into the provided buffer and returns the number of bytes written (52). The buffer must be at least 52 bytes long.

pub fn serialize_into(&self, buf: &mut [u8]) -> usize

pub fn from_slice(slice: &[u8]) -> DCBResult<Self>

Creates a HeaderNode from a byte slice Accepts legacy 48-byte layout (no schema, schema_version=0) or the current 52-byte layout (schema as u32 at the end). Layout (first 48 bytes):

• 8 bytes for tsn
• 8 bytes for next_page_id
• 8 bytes for free_lists_tree_root_id
• 8 bytes for events_tree_root_id
• 8 bytes for tags_tree_root_id
• 8 bytes for next_position

Arguments

• slice - The byte slice to deserialize from

Returns

• Result<Self> - The deserialized HeaderNode or an error

Trait Implementations

impl Clone for HeaderNode

fn clone(&self) -> HeaderNode

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for HeaderNode

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for HeaderNode

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for HeaderNode

fn eq(&self, other: &HeaderNode) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for HeaderNode

impl StructuralPartialEq for HeaderNode