Trait RegionStatAwareSelector 

pub trait RegionStatAwareSelector: Send + Sync {
    type Context;
    type Output;

    // Required method
    fn select<'life0, 'life1, 'life2, 'life3, 'life4, 'async_trait>(
        &'life0 self,
        ctx: &'life1 Self::Context,
        from_peer_id: u64,
        region_ids: &'life2 [RegionId],
        exclude_peer_ids: HashSet<u64>,
        exclude_peer_ids_by_region: &'life3 HashMap<RegionId, BTreeSet<u64>>,
        affinity: Option<&'life4 AffinityRequirements>,
    ) -> Pin<Box<dyn Future<Output = Result<Self::Output>> + Send + 'async_trait>>
       where Self: 'async_trait,
             'life0: 'async_trait,
             'life1: 'async_trait,
             'life2: 'async_trait,
             'life3: 'async_trait,
             'life4: 'async_trait;
}

A selector that aware of region statistics

It selects the best destination peer for a list of regions. The selection is based on the region statistics, such as the region leader’s write throughput.

A region is never placed on exclude_peer_ids, nor on its own peers in exclude_peer_ids_by_region. It returns the regions it placed, possibly none: a region without a remaining candidate is left out. Errors are for other failures.

Required Associated Types

type Context

type Output

Required Methods

fn select<'life0, 'life1, 'life2, 'life3, 'life4, 'async_trait>( &'life0 self, ctx: &'life1 Self::Context, from_peer_id: u64, region_ids: &'life2 [RegionId], exclude_peer_ids: HashSet<u64>, exclude_peer_ids_by_region: &'life3 HashMap<RegionId, BTreeSet<u64>>, affinity: Option<&'life4 AffinityRequirements>, ) -> Pin<Box<dyn Future<Output = Result<Self::Output>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait, 'life4: 'async_trait,

Dyn Compatibility

This trait is dyn compatible.

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

Implementors