Trait Partitioner

pub trait Partitioner {
    type Item;
    type Key: Clone + Eq + Hash;

    // Required method
    fn partition(&self, item: &Self::Item) -> Self::Key;
}

Calculate partitions for an item

This trait allows us to express in the type system that for some Item we are able to calculate a Key that identifies that item.

Required Associated Types

type Item

type Key: Clone + Eq + Hash

Required Methods

fn partition(&self, item: &Self::Item) -> Self::Key

Partition the Item by calculating its Key

The resulting key should ideally be unique for an Item or arrived at in such a way that if two distinct Item instances partition to the same key they are mergeable if put into the same collection by this key.

Implementors