Struct rustdb::blockpagestg::BlockPageStg

pub struct BlockPageStg {
    pub ds: DividedStg,
    /* private fields */
}

Implementation of PageStorage using DividedStg.

Fields

ds: DividedStg

Underlying Divided Storage.

Implementations

impl BlockPageStg

pub fn new(stg: Box<dyn Storage>, lim: &Limits) -> Box<Self>

Construct from specified Storage and limits.

Trait Implementations

impl PageStorage for BlockPageStg

fn is_new(&self) -> bool

Is the underlying storage new?

fn new_page(&mut self) -> u64

Make a new page, result is page number.

fn drop_page(&mut self, pn: u64)

Drop page number.

fn info(&self) -> Box<dyn PageStorageInfo>

Information about page sizes.

fn set_page(&mut self, pn: u64, data: Data)

Set contents of page.

fn get_page(&self, pn: u64) -> Data

Get contents of page.

fn size(&self, pn: u64) -> usize

Get page size (for repacking).

fn save(&mut self)

Save pages to underlying storage.

fn rollback(&mut self)

Undo changes since last save ( but set_page/renumber cannot be undone, only new_page and drop_page can be undone ).

fn wait_complete(&self)

Wait until save is complete.

fn get_free(&mut self) -> (FxHashSet<u64>, u64)

Get set of free pages and number of pages ever allocated ( for VERIFY builtin function ).

fn load_free_pages(&mut self) -> Option<u64>

Load free pages in preparation for page renumbering. Returns number of used pages or None if there are no free pages.

fn renumber(&mut self, pn: u64) -> u64

Renumber page.

fn set_alloc_pn(&mut self, target: u64)

Final part of page renumber operation.