apool

This crate allows you to create a Pool of any type T: Send + Sync lazily. When trying to acquire a &mut T - if no instances have been created yet a new one will be created, - if all instances are in use, a new instance will be created, - unless a specified pool maximum is reached the task will wait for a instance to become free again.

T does not need to implement Clone, instead the Pool requites a type S which acts as State, and a dyn Fn(&mut S, &mut PoolTransformer<T>) which can create new instances of T. The Fn will only be called if the maximum has not yet been reached.

Usage

``` let pool = Pool::::new( 4, "fakedb://127.0.0.1:1337/fake_website", |state, transformer| { let url = *state; transformer.spawn(async { FakeDatabase::connect(url).await.unwrap() }); }, );

let guard = pool.get().await; guard.commit_data().await; ```