Enum Mapper

pub enum Mapper<'l> {
    Heap {
        write_cursor: (u64, usize),
        mapper: Vec<Section<'l>>,
    },
    Disk,
}

The mapper that holds all the writes to the layer and their location mapping in the database

Variants

Heap

A read-write version of the mapper on the heap

Fields

write_cursor: (u64, usize)

The current write cursor to speed up sequential qrites

mapper: Vec<Section<'l>>

self explainitory

Disk

A read-only version of the mapper on the disk

Implementations

impl<'l> Mapper<'l>

pub fn new() -> Self

Creates a new heap-based mapper

pub fn get_writer( &mut self, ) -> Result<(&mut Vec<Section<'l>>, &mut (u64, usize)), Error>

Grabs the internal heap representation; if on disk, throw the ReadOnly error

pub fn iter<'a, Stream: Read + Write + Seek>( &'a self, stream: &'a mut Stream, size: u64, cursor: u64, ) -> Result<MapperIter<'a, Stream>, Error>

Generates an iterator over the interal mapper, from the stream, size and layer read cursor position

Trait Implementations

impl<'l> Debug for Mapper<'l>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'l> Default for Mapper<'l>

fn default() -> Self

Returns the “default value” for a type.