Struct Pager 

pub struct Pager {
    pub meta: IndexMeta,
    /* private fields */
}

Fields

meta: IndexMeta

Implementations

impl Pager

pub fn create(path: &Path) -> IsamResult<Self>

Create a brand-new index file. Writes page 0 (metadata) and allocates page 1 as an empty leaf (the initial root).

pub fn open(path: &Path) -> IsamResult<Self>

Open an existing index file and read its metadata header.

pub fn read_page(&mut self, id: u32) -> IsamResult<Vec<u8>>

Read page id into a fresh PAGE_SIZE-byte buffer.

pub fn write_page(&mut self, id: u32, data: &[u8]) -> IsamResult<()>

Write data (must be exactly PAGE_SIZE bytes) to page id.

pub fn alloc_page(&mut self) -> IsamResult<u32>

Allocate a new blank page at the end of the file and return its id.

pub fn flush_meta(&mut self) -> IsamResult<()>

Write the current self.meta back to page 0.

pub fn flush(&mut self) -> IsamResult<()>

Flush OS write buffers.

pub fn fsync(&mut self) -> IsamResult<()>

Flush and fsync for durability.

pub fn empty_leaf_page() -> Vec<u8>

Returns an empty leaf page (all zeros except the page_type byte).

pub fn empty_internal_page() -> Vec<u8>

Returns an empty internal page.