Struct rustdb::pstore::Stash

pub struct Stash {
    pub time: u64,
    pub pages: HashMap<u64, PageInfoPtr>,
    pub readers: BTreeMap<u64, usize>,
    pub updates: BTreeMap<u64, HashSet<u64>>,
}

Central store of data.

Fields

time: u64

Write time - number of writes.

pages: HashMap<u64, PageInfoPtr>

Page number -> page info.

readers: BTreeMap<u64, usize>

Time -> reader count.

updates: BTreeMap<u64, HashSet<u64>>

Time -> set of page numbers.

Implementations

impl Stash

pub fn set(&mut self, lpnum: u64, data: Data)

Set the value of the specified page for the current time.

pub fn get(&mut self, lpnum: u64) -> PageInfoPtr

Get the PageInfoPtr for the specified page.

pub fn begin_read(&mut self) -> u64

Register that there is a client reading the database. The result is the current time.

pub fn end_read(&mut self, time: u64)

Register that the read at the specified time has ended. Stashed pages may be freed.

pub fn end_write(&mut self) -> usize

Register that an update operation has completed. Time is incremented. Stashed pages may be freed.

Trait Implementations

impl Default for Stash

fn default() -> Self

Returns the “default value” for a type.