Re: how to defer a method call until the return of an async server call?

Hi Jens,

yes, there are many options, but as I wrote, there are always some annoying things that make the code unattractive somehow.

The options 2) and 3) require an additional member variable to hold the inviter's value until the server call returns, and finally you end up in redundancy: The same information about the inviter is hold in the member variable as well in the list widget itsef. The same holds for the invited user. In addition, this would simply move the synchronization task to another place.

The options 1) and 4) require an external intervention into the inner details of the class. A form object should accept and deliver the identities of the two players to its encapsulating context, but it should not reveal whether the users are selected from a list or if their names (or numbers) are entered in a text field.

The option 5) seems to result from a misunderstanding: The inviter and invited are identified by integers and independend from the list. But to display them in a list widget, it must be filled first.

However, there is not really a problem, but I would have appreciated if there were an option like this (inspired by Scheduler.get().scheduleDeferred):

public void setInviter (final int inviter)

{

 // we have access to the AsyncCallback<List<User>> object here

 Scheduler.get().scheduleDeferredWhenServerCallReturned

 (

  new Command()

  {

   public void execute ()

   {

    lst_Inviter.select(inviter);

   }

  }

}

The main benefit would be that we could pass the value to the schedule command and immediately forget it after that.

Magnus

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