// void async is bad
// exception in async void will cause the whole methid to give exception and application to crash
//private async void MethodToBeExecutedAsyncCrash()
private async Task MethodToBeExecutedAsyncNoCrash()
{
var _rep = new ClassCoffee(); // create a new object
var result = await _rep.GetValueAsync(); // asked and awaited from cofee object repository
throw new Exception(message: "Something failed");
Console.WriteLine($"result is: {result}");
//using try{}catch(){} will avoid the error
}
/*actions:1.Pour a cup of coffee.
* 2.Heat up a pan, then fry two eggs.
* 3.Fry three slices of bacon.
* 4.Toast two pieces of bread.
* 5.Add butter and jam to the toast.
* 6.Pour a glass of orange juice. */
static async Task Main(string[] args)
{
MyLibrary.AsyncUnitTesting();
ClassCoffee cup = PourCoffee();
Console.WriteLine("coffee is ready");
Task <ClassEgg> eggsTask = FryEggsAsync(2);
Task <ClassBacon> baconTask = FryBaconAsync(3);
Task <ClassToast> toastTask = MakeToastWithButterAndJamAsync(2);
// tasks started to execute
var breakfastTasks = new List <Task> {
eggsTask, baconTask, toastTask
};
while (breakfastTasks.Count > 0)
{
//// WhenAll returns a Task that completes when all the tasks in its argument list have completed
//await Task.WhenAll(eggsTask, baconTask, toastTask);
// WhenAny returns a Task<Task> that completes when any of its arguments completes
// one task from list finished execution
Task finishedTask = await Task.WhenAny(breakfastTasks);
if (finishedTask == eggsTask)
{
Console.WriteLine("eggs are ready");
}
else if (finishedTask == baconTask)
{
Console.WriteLine("bacon is ready");
}
else if (finishedTask == toastTask)
{
Console.WriteLine("toast is ready");
}
breakfastTasks.Remove(finishedTask);
}
ClassJuice oj = PourOJ();
Console.WriteLine("oj is ready");
Console.WriteLine("Breakfast is ready!");
}