Run multiple commands at the same time

[oskarer]

First of all, thank you for this library! It has been a blast so far 🥇

I have a use case where I want to dispatch two (or more) commands after a command finished. They're all promises.

Example;

export class OnJoinCommand extends Command<YourState, { sessionId: string }> {
  execute({ sessionId }) {
    this.state.players[sessionId] = new Player();
    return [
      new FirstCommand().setPayload({ sessionId }),
      new SecondCommand().setPayload({ sessionId })
    ];
  }
}

In that case SecondCommand would execute after FirstCommand finished, how would I execute both at the same time?

[oskarer]

#4 fits my use case but I guess supporting both async and sync execution would be good.

[endel]

Hi @oskarer 👋 glad you're using this and thanks for providing the workaround!

I agree it would be nice to provide a way to either run them at once or sequentially. There are so many ways to achieve that, I'm not sure which one would be elegant/intuitive and minimal enough though.

Maybe we could have an AsyncCommand that you extend from? Every Command could be async, but maybe only AsyncCommand's do not await for the response, and just moves on...

import { AsyncCommand } from "@colyseus/command";

export class FirstCommand extends AsyncCommand<YourState, { sessionId: string }> {
  async execute() {
  }
}

export class SecondCommand extends AsyncCommand<YourState, { sessionId: string }> {
  async execute() {
  }
}

What do you think?

[oskarer]

@endel That sounds like an elegant solution to me! 👍