rakka-cluster-sharding 0.2.1

Sharded entities for rakka — allocation strategies, rebalance, three-phase handoff, remember-entities.
Documentation 
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//! `IMessageExtractor` equivalent from akka.net.

pub trait MessageExtractor: Send + Sync + 'static {
    type Message: Send + 'static;

    fn entity_id(&self, message: &Self::Message) -> String;
    fn shard_id(&self, message: &Self::Message) -> String;
}