Trait Allocator

pub trait Allocator<'l> {
    type LayerStream: Write + Read + Seek;

    // Required methods
    fn load_layers(&self) -> Result<Vec<Layer<'l, Self::LayerStream>>, Error>;
    fn add_layer(&mut self) -> Result<Layer<'l, Self::LayerStream>, Error>;
    fn drop_top_layer(&mut self) -> Result<(), Error>;
    fn rebase(&mut self, top_layer: usize) -> Result<(), Error>;
}

The allocator for a StackDB that defines how or where the layers are stored and managed

Required Associated Types

type LayerStream: Write + Read + Seek

The type of data stream the layers read and write to

Required Methods

fn load_layers(&self) -> Result<Vec<Layer<'l, Self::LayerStream>>, Error>

Loads all the read-only layers in the database as Layers

fn add_layer(&mut self) -> Result<Layer<'l, Self::LayerStream>, Error>

Adds a read-write layer to the database

fn drop_top_layer(&mut self) -> Result<(), Error>

Removes the top layer from the database

fn rebase(&mut self, top_layer: usize) -> Result<(), Error>

Removes all the bottom layers except for the one specified (and above)

Implementors

impl<'a> Allocator<'a> for SkdbDirAlloc

type LayerStream = File

impl<'a> Allocator<'a> for SkdbMemAlloc

type LayerStream = Cursor<Vec<u8>>