How to use actors of akka.net in MVVM?

It seems that it is very easy to use akka.net in a console app or in unit tests.

But I wanted to try out some actors for a simple login method: open a splash screen, send a login command, close the splash screen when login was ok. Now the answer is sent to the sender, which is an actor. Awaiting the answer of an Ask call would block the UI. The MainViewModel is already derived from a base class, so make it an actor is not an option.

public void OnStartupCommand(EventArgs args)

{

    _splashScreen = new SplashScreenView();

    _splashScreen.Show();

    // [1]

    _actorSystem.ActorSelection("/user/system").Tell(new Login("Me"));

    // [2]

    var mainWindowActor =_actorSystem.ActorOf(Props.Create(() => new 

    MainWindowActor(this)), "mainwindow");

    mainWindowActor.Tell(new Login("me"));

    // [3]

    var result = await _actorSystem.ActorSelection("/user/system").Ask(new Login("me")); 

}

Call the responsible actor directly, answer is send to deadletters. Are there more complex examples?

Would receive the answer and could call callbacks of the mainviewmodel, but gives me InvalidOperationException "Call from invalid thread"

Seems to be the only way to get the result of the call

I am wondering how to fill ListViews or ComboBoxes by Actor messagings.

asked Nov 19 '18 at 21:03

Slesa

10518

add a comment |

It seems that it is very easy to use akka.net in a console app or in unit tests.

public void OnStartupCommand(EventArgs args)

{

    _splashScreen = new SplashScreenView();

    _splashScreen.Show();

    // [1]

    _actorSystem.ActorSelection("/user/system").Tell(new Login("Me"));

    // [2]

    var mainWindowActor =_actorSystem.ActorOf(Props.Create(() => new 

    MainWindowActor(this)), "mainwindow");

    mainWindowActor.Tell(new Login("me"));

    // [3]

    var result = await _actorSystem.ActorSelection("/user/system").Ask(new Login("me")); 

}

Call the responsible actor directly, answer is send to deadletters. Are there more complex examples?

Would receive the answer and could call callbacks of the mainviewmodel, but gives me InvalidOperationException "Call from invalid thread"

Seems to be the only way to get the result of the call

I am wondering how to fill ListViews or ComboBoxes by Actor messagings.

asked Nov 19 '18 at 21:03

Slesa

10518

add a comment |

It seems that it is very easy to use akka.net in a console app or in unit tests.

public void OnStartupCommand(EventArgs args)

{

    _splashScreen = new SplashScreenView();

    _splashScreen.Show();

    // [1]

    _actorSystem.ActorSelection("/user/system").Tell(new Login("Me"));

    // [2]

    var mainWindowActor =_actorSystem.ActorOf(Props.Create(() => new 

    MainWindowActor(this)), "mainwindow");

    mainWindowActor.Tell(new Login("me"));

    // [3]

    var result = await _actorSystem.ActorSelection("/user/system").Ask(new Login("me")); 

}

Call the responsible actor directly, answer is send to deadletters. Are there more complex examples?

Would receive the answer and could call callbacks of the mainviewmodel, but gives me InvalidOperationException "Call from invalid thread"

Seems to be the only way to get the result of the call

I am wondering how to fill ListViews or ComboBoxes by Actor messagings.

asked Nov 19 '18 at 21:03

Slesa

10518

It seems that it is very easy to use akka.net in a console app or in unit tests.

public void OnStartupCommand(EventArgs args)

{

    _splashScreen = new SplashScreenView();

    _splashScreen.Show();

    // [1]

    _actorSystem.ActorSelection("/user/system").Tell(new Login("Me"));

    // [2]

    var mainWindowActor =_actorSystem.ActorOf(Props.Create(() => new 

    MainWindowActor(this)), "mainwindow");

    mainWindowActor.Tell(new Login("me"));

    // [3]

    var result = await _actorSystem.ActorSelection("/user/system").Ask(new Login("me")); 

}

Call the responsible actor directly, answer is send to deadletters. Are there more complex examples?

Would receive the answer and could call callbacks of the mainviewmodel, but gives me InvalidOperationException "Call from invalid thread"

Seems to be the only way to get the result of the call

I am wondering how to fill ListViews or ComboBoxes by Actor messagings.

.net wpf xaml akka.net

asked Nov 19 '18 at 21:03

Slesa

10518

asked Nov 19 '18 at 21:03

Slesa

10518

asked Nov 19 '18 at 21:03

Slesa

10518

asked Nov 19 '18 at 21:03

Slesa

10518

asked Nov 19 '18 at 21:03

Slesa

10518

add a comment |

1 Answer
1

active

oldest

votes

By default most of akka actors are scheduled in background threads, therefore they cannot make direct updates on the UI (only UI/primary thread of the application is allowed to do that). If you want to spawn an actor on UI thread, you need to configure it to use SynchronizedDispatcher.

answered Nov 23 '18 at 8:55

Bartosz Sypytkowski

5,053925

Yes, understood. The threading thing is solvable. But how would I really create an actor, which wants to, let's say, get the content of a listview? Would the Form/Widget/Whatever be an actor on its own to be able to receive the answer? Or would I use eventing to redirect the incoming data? But then it probably won't fit with the streaming stuff, would it? I am looking here for a good/best practice, you know
– Slesa
Nov 23 '18 at 21:52

This is more design issue (not fit for StackOverflow question), but general intuition is to keep the Single Responsibility Principle. If you want to use an actor for updating UI controls, don't use it for managing i.e. business domain logic.
– Bartosz Sypytkowski
Nov 25 '18 at 8:57

add a comment |

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answered Nov 23 '18 at 8:55

Bartosz Sypytkowski

5,053925

Yes, understood. The threading thing is solvable. But how would I really create an actor, which wants to, let's say, get the content of a listview? Would the Form/Widget/Whatever be an actor on its own to be able to receive the answer? Or would I use eventing to redirect the incoming data? But then it probably won't fit with the streaming stuff, would it? I am looking here for a good/best practice, you know
– Slesa
Nov 23 '18 at 21:52

This is more design issue (not fit for StackOverflow question), but general intuition is to keep the Single Responsibility Principle. If you want to use an actor for updating UI controls, don't use it for managing i.e. business domain logic.
– Bartosz Sypytkowski
Nov 25 '18 at 8:57

add a comment |

answered Nov 23 '18 at 8:55

Bartosz Sypytkowski

5,053925

Yes, understood. The threading thing is solvable. But how would I really create an actor, which wants to, let's say, get the content of a listview? Would the Form/Widget/Whatever be an actor on its own to be able to receive the answer? Or would I use eventing to redirect the incoming data? But then it probably won't fit with the streaming stuff, would it? I am looking here for a good/best practice, you know
– Slesa
Nov 23 '18 at 21:52

This is more design issue (not fit for StackOverflow question), but general intuition is to keep the Single Responsibility Principle. If you want to use an actor for updating UI controls, don't use it for managing i.e. business domain logic.
– Bartosz Sypytkowski
Nov 25 '18 at 8:57

add a comment |

answered Nov 23 '18 at 8:55

Bartosz Sypytkowski

5,053925

answered Nov 23 '18 at 8:55

Bartosz Sypytkowski

5,053925

answered Nov 23 '18 at 8:55

Bartosz Sypytkowski

5,053925

answered Nov 23 '18 at 8:55

Bartosz Sypytkowski

5,053925

answered Nov 23 '18 at 8:55

Bartosz Sypytkowski

5,053925

Yes, understood. The threading thing is solvable. But how would I really create an actor, which wants to, let's say, get the content of a listview? Would the Form/Widget/Whatever be an actor on its own to be able to receive the answer? Or would I use eventing to redirect the incoming data? But then it probably won't fit with the streaming stuff, would it? I am looking here for a good/best practice, you know
– Slesa
Nov 23 '18 at 21:52

This is more design issue (not fit for StackOverflow question), but general intuition is to keep the Single Responsibility Principle. If you want to use an actor for updating UI controls, don't use it for managing i.e. business domain logic.
– Bartosz Sypytkowski
Nov 25 '18 at 8:57

add a comment |

Yes, understood. The threading thing is solvable. But how would I really create an actor, which wants to, let's say, get the content of a listview? Would the Form/Widget/Whatever be an actor on its own to be able to receive the answer? Or would I use eventing to redirect the incoming data? But then it probably won't fit with the streaming stuff, would it? I am looking here for a good/best practice, you know
– Slesa
Nov 23 '18 at 21:52

This is more design issue (not fit for StackOverflow question), but general intuition is to keep the Single Responsibility Principle. If you want to use an actor for updating UI controls, don't use it for managing i.e. business domain logic.
– Bartosz Sypytkowski
Nov 25 '18 at 8:57

Yes, understood. The threading thing is solvable. But how would I really create an actor, which wants to, let's say, get the content of a listview? Would the Form/Widget/Whatever be an actor on its own to be able to receive the answer? Or would I use eventing to redirect the incoming data? But then it probably won't fit with the streaming stuff, would it? I am looking here for a good/best practice, you know
– Slesa
Nov 23 '18 at 21:52

This is more design issue (not fit for StackOverflow question), but general intuition is to keep the Single Responsibility Principle. If you want to use an actor for updating UI controls, don't use it for managing i.e. business domain logic.
– Bartosz Sypytkowski
Nov 25 '18 at 8:57

add a comment |

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