Struct pagecache::NullMaterializer

pub struct NullMaterializer;

A materializer for things that have nothing to materialize or recover, like a standalone Log.

Trait Implementations

impl Clone for NullMaterializer

fn clone(&self) -> NullMaterializer

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NullMaterializer

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

Formats the value using the given formatter.

impl PartialEq for NullMaterializer

fn eq(&self, other: &NullMaterializer) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Materializer for NullMaterializer

type PageFrag = ()

The possibly fragmented page, written to log storage sequentially, and read in parallel from multiple locations on disk when serving a request to read the page. These will be merged to a single version at read time, and possibly cached.

type Recovery = ()

The higher-level recovery state, as described by Materializer::recover

fn new(_: Config, _: &Option<Self::Recovery>) -> Self

Create a new Materializer with the previously recovered state if any existed.

fn merge(&self, _: &[&Self::PageFrag]) -> Self::PageFrag

Used to merge chains of partial pages into a form that is useful for the PageCache owner.

fn recover(&self, _: &Self::PageFrag) -> Option<Self::Recovery>

Used to feed custom recovery information back to a higher-level abstraction during startup. For example, a B-Link tree must know what the current root node is before it can start serving requests.