support adding custom dispatchers

[pjfanning]

Akka/Pekko may already have a mechanism for adding custom dispatcher implementations. I just haven't found anything obvious.

With Java Virtual Threads, it would be nice if an external party could create a custom dispatcher that uses throwaway virtual threads instead of pooling them.

[spangaer]

You mean something else than?

  akka.actor {
    default-dispatcher = {
      type = "....MyDispatcherConfigurator"
    }
  }

[pjfanning]

something like:

my-dispatcher {
  # Dispatcher is the name of the event-based dispatcher
  type = Dispatcher
  # What kind of ExecutionService to use
  executor = "com.acme.pekko.extensions.JavaVirtualThreadDispatcher"
  ..
}

[spangaer]

But isn't point that that Configurator can produce a custom dispatcher/executor?

https://gist.github.com/yanns/f7da61c582ab1da3535d#file-gistfile1-scala-L41

[pjfanning]

thanks - that gist looks like a good example - maybe we should include something like that in the Pekko docs

[He-Pin]

it's currently using the fork join pool, maybe we can change that as CE to include a WSTP。

[spangaer]

The what from the what now?

Anyhow, using the fork join pool is also about the interaction with the scala.concurrent.blocking code block of course.