Trait BackendSelection

pub trait BackendSelection {
    type Iter;

    // Required methods
    fn build(backends: &BTreeSet<Backend>) -> Self;
    fn iter(self: &Arc<Self>, key: &[u8]) -> Self::Iter
       where Self::Iter: BackendIter;
}

BackendSelection is the interface to implement backend selection mechanisms.

Required Associated Types

type Iter

The BackendIter returned from iter() below.

Required Methods

fn build(backends: &BTreeSet<Backend>) -> Self

The function to create a BackendSelection implementation.

fn iter(self: &Arc<Self>, key: &[u8]) -> Self::Iter

where Self::Iter: BackendIter,

Select backends for a given key.

An BackendIter should be returned. The first item in the iter is the first choice backend. The user should continue to iterate over it if the first backend cannot be used due to its health or other reasons.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl BackendSelection for KetamaHashing

type Iter = OwnedNodeIterator

impl<H: SelectionAlgorithm> BackendSelection for Weighted<H>

type Iter = WeightedIterator<H>