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C#•9mo ago

❔ UniTask / Unity - await/async connoisseurs wanted. Need help understanding

    public void TryRegister()
    {
        TryRegisterAsync().Forget(); // UI Register Button - Fire & Forget Method, 
    }
    public async UniTaskVoid TryRegisterAsync()
    {
        PlayerSelectionData[] psd = await tryRegisterAsync();
        
        UI_PlayerSelection.Instance.Init(psd);
        gameObject.SetActive(false);
    }
    private async UniTask<PlayerSelectionData[]> tryRegisterAsync()
    {
        var email = _emailInput.text;
        var pass = _passwordInput.text;

        PlayerSelectionData[] psd = await CommsManager.Instance.CMD_TryRegisterAsync(email, pass);

        return psd;
    }

    public void TryRegister()
    {
        TryRegisterAsync().Forget(); // UI Register Button - Fire & Forget Method, 
    }
    public async UniTaskVoid TryRegisterAsync()
    {
        PlayerSelectionData[] psd = await tryRegisterAsync();
        
        UI_PlayerSelection.Instance.Init(psd);
        gameObject.SetActive(false);
    }
    private async UniTask<PlayerSelectionData[]> tryRegisterAsync()
    {
        var email = _emailInput.text;
        var pass = _passwordInput.text;

        PlayerSelectionData[] psd = await CommsManager.Instance.CMD_TryRegisterAsync(email, pass);

        return psd;
    }

Is this correct? I want to wait for Server (via CommsManager) to reply with PlayerSelectionData[], after receiving that, I want to call UI_PlayerSelection.Instance.Init(psd); BTW, UniTask is pretty much the same as C# Tasks, just a different keyword for example async void == async UniTaskVoid. CommsManager (method just for testing):

    public async UniTask<PlayerSelectionData[]> CMD_TryRegisterAsync(string email, string pass)
    {
        await UniTask.Delay(1000);

        var psd1 = new PlayerSelectionData("Player_1", 3);
        var psd2 = new PlayerSelectionData("Player_2", 10);
        return new PlayerSelectionData[] { psd1, psd2 };
    }

    public async UniTask<PlayerSelectionData[]> CMD_TryRegisterAsync(string email, string pass)
    {
        await UniTask.Delay(1000);

        var psd1 = new PlayerSelectionData("Player_1", 3);
        var psd2 = new PlayerSelectionData("Player_2", 10);
        return new PlayerSelectionData[] { psd1, psd2 };
    }

This seems to work... But I heard its incorrect, see replies below. Thanks

33 Replies

Carly.TeamSail•9mo ago

I was using events/callbacks before, but it was recommended to switch to async/await. Just to test/learn async/await I changed the CMD_TryRegisterAsync() Method to this:

    public async UniTask<PlayerSelectionData[]> CMD_TryRegisterAsync(string email, string pass)
    {
        await UniTask.Delay(1000);

        var psd1 = new PlayerSelectionData("Player_1", 3);
        var psd2 = new PlayerSelectionData("Player_2", 10);
        return new PlayerSelectionData[] { psd1, psd2 };
    }

    public async UniTask<PlayerSelectionData[]> CMD_TryRegisterAsync(string email, string pass)
    {
        await UniTask.Delay(1000);

        var psd1 = new PlayerSelectionData("Player_1", 3);
        var psd2 = new PlayerSelectionData("Player_2", 10);
        return new PlayerSelectionData[] { psd1, psd2 };
    }

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

Yes

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

UniTask is real async/await

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

It works exactly the same as async/await

MODiX•9mo ago

TeBeCo

I suggest you add that to the title toward the left to make it visible

Quoted by

<@689473681302224947> from #await/async connoisseurs wanted. Need help understanding (click here)

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Unknown User•9mo ago

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Carly.TeamSail•9mo ago

I see Somehow it does wait 1 sec and then init the selection panel correctly with the PSD's I created inside CommsManager

    public void TryRegister()
    {
        TryRegisterAsync().Forget(); // UI Register Button - Fire & Forget Method, 
    }
    public async UniTaskVoid TryRegisterAsync()
    {
        PlayerSelectionData[] psd = await tryRegisterAsync();

        UI_PlayerSelection.Instance.Init(psd);
        gameObject.SetActive(false);
    }
    private async UniTask<PlayerSelectionData[]> tryRegisterAsync()
    {
        var email = _emailInput.text;
        var pass = _passwordInput.text;

        PlayerSelectionData[] psd = await CommsManager.Instance.CMD_TryRegisterAsync(email, pass);

        return psd;
    }

    public void TryRegister()
    {
        TryRegisterAsync().Forget(); // UI Register Button - Fire & Forget Method, 
    }
    public async UniTaskVoid TryRegisterAsync()
    {
        PlayerSelectionData[] psd = await tryRegisterAsync();

        UI_PlayerSelection.Instance.Init(psd);
        gameObject.SetActive(false);
    }
    private async UniTask<PlayerSelectionData[]> tryRegisterAsync()
    {
        var email = _emailInput.text;
        var pass = _passwordInput.text;

        PlayerSelectionData[] psd = await CommsManager.Instance.CMD_TryRegisterAsync(email, pass);

        return psd;
    }

Can you please correct this if its incorrect? Im an async/await noob

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

the scheduler is not the same the runtime is not the same the threadpool is not the same

I have very limited understanding of the above, except for understanding the broad concepts, like threadpool is the available threads, but no idea how that works, however I did read that async/await doesnt actually use additional threads at all, its some kind of C# black magic...

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

Am I a thread in this ex?

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

What am i oh

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

I see

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

The brains of the operation

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

the bitshifter of the operation

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

I understand the concept

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

Just not how to write the code

Unknown User•9mo ago

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Carly.TeamSail•9mo ago

I see, I use FishNet (high level networking) so its basically comparable, just call a method and the rest is done internally...

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MODiX•9mo ago

TLDR on async/await: * every .net API that is suffixed with Async (eg: .Read() and .ReadAsync()) => use the Async version * if the API name ends with Async => await it * if the API returns a Task => await it * if you have to await in a method: * that method must have the async keyword (you could even suffix your function name with Async, up to you) * if it was returning T (eg:string) => it should now return Task<T> (eg: Task<string>) * APIs to ban and associated fix:

var r = t.Result;                   /* ===> */ var r = await t;
t.Wait();                           /* ===> */ await t;
var r = t.GetAwaiter().GetResult(); /* ===> */ var r = await t;
Task.WaitAll(t1, t2);               /* ===> */ await Task.WhenAll(t1, t2);

var r = t.Result;                   /* ===> */ var r = await t;
t.Wait();                           /* ===> */ await t;
var r = t.GetAwaiter().GetResult(); /* ===> */ var r = await t;
Task.WaitAll(t1, t2);               /* ===> */ await Task.WhenAll(t1, t2);

Carly.TeamSail•9mo ago

Thanks for your help and time, I updated the OP with my new code, hopefully someone with UniTask knowledge will jump in and correct it /improve it...

Cattywampus•9mo ago

UniTask is just a wrapper on top of async/await + CustomYieldInstruction. Yeah it's basically just async/await that respects Unity's frame timing

Accord•9mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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