It's an implementation for actix-storage based on std lib's hashmap, please refer to actix-storage crate documentations.
There are 2 different implementors available in this crate
HashMapStore is a simple store without expiration functionality.
HashMapActor is a full expiry_store implementation available under actor feature.
HashMapActor is an AsyncActor running in actix's arbiter which uses tokio's delayqueue internally for expiration notifications.
It is possible to specify the size for the underlying channel between tokio's delayqueue and the actor. The default capacity of hashmap is also configurable.
rust
let store = HashMapActor::with_capacity(10_000).start();
// OR
let store = HashMapActor::with_channel_size(16, 16).start();
// OR
let store = HashMapActor::with_capacity_and_channel_size(10_000, 16, 16).start();