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)

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

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

type LayerStream = File

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

type LayerStream = Cursor<Vec<u8>>