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Improve usability of the Spawn trait #311

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Thomasdezeeuw opened this issue Oct 22, 2020 · 2 comments · May be fixed by #634
Open

Improve usability of the Spawn trait #311

Thomasdezeeuw opened this issue Oct 22, 2020 · 2 comments · May be fixed by #634
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enhancement An improvement of the API. priority:low Low priority issue. RT Related to the Heph-rt crate.

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@Thomasdezeeuw
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Thomasdezeeuw commented Oct 22, 2020 •
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In commit c33ed02 (issue #279) a new Spawn trait was introduced. It comes with three generic parameters S (Supervisor), NA (NewActor) and RT (either ThreadLocal or ThreadSafe). This was required because spawn of thread-safe actors requires, S, NA and NA::Actor to be Send + Sync, while thread-local actors don't have this requirement. However when using async function as actor we can't name NA or NA::Actor, making this trait impossible to use with it.

My initial idea was to split the two traits: Spawn and SpawnLocal, but types like TcpServer need a single trait otherwise we have to implement that twice as well.
@Thomasdezeeuw Thomasdezeeuw added the enhancement An improvement of the API. label Oct 22, 2020
@Thomasdezeeuw
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Some context: Spawn should be able to be used in functions that start actors. For example:

fn start_my_actor<S>(spawn: S)
where
    S: Spawn<MySupervisor, MyActor, ThreadLocal>
{
    // ...
}

The problem here is that MyActor for asynchronous function can't be named. MySupervisor is also a bit hard when using a regular function.

@Thomasdezeeuw Thomasdezeeuw added this to the First release milestone Mar 2, 2021
@Thomasdezeeuw Thomasdezeeuw added the priority:low Low priority issue. label Mar 12, 2021
@Thomasdezeeuw Thomasdezeeuw mentioned this issue Mar 26, 2021
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@Thomasdezeeuw
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In pr #433 I reviewed the trait again, but I didn't see any to move the S and NA parameters to the methods. Punting this until after the first release.

@Thomasdezeeuw Thomasdezeeuw removed this from the First release milestone Mar 26, 2021
@Thomasdezeeuw Thomasdezeeuw linked a pull request Apr 29, 2024 that will close this issue
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@Thomasdezeeuw Thomasdezeeuw added the RT Related to the Heph-rt crate. label Dec 22, 2024
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enhancement An improvement of the API. priority:low Low priority issue. RT Related to the Heph-rt crate.
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Rewrite Spawn trait Thomasdezeeuw/heph
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