i3arnon’s answer with TPL Dataflow is good; Dataflow is useful especially if you have a mix of CPU and I/O bound code. I’ll echo his sentiment that Parallel is designed for CPU-bound code; it’s not the best solution for I/O-based code, and especially not appropriate for asynchronous code. If you want an alternative solution that … Read more
You might look into Jobs or runspaces. Here is an example of Jobs: $block = { Param([string] $file) “[Do something]” } #Remove all jobs Get-Job | Remove-Job $MaxThreads = 4 #Start the jobs. Max 4 jobs running simultaneously. foreach($file in $files){ While ($(Get-Job -state running).count -ge $MaxThreads){ Start-Sleep -Milliseconds 3 } Start-Job -Scriptblock $Block -ArgumentList … Read more
Here is what you may want to do: public async Task<PewPew> SomeMethod(Foo foo) { // get the stuff on another thread var cTask = Task.Run(() => GetAllTheCats(foo)); var fTask = Task.Run(() => GetAllTheFood(foo)); var cats = await cTask; var food = await fTask; return new PewPew { Cats = cats, Food = food }; } … Read more
Does this get anywhere near your requirements? The behaviour falls somewhere between ExecutionAndPublication and PublicationOnly. While the initializer is in-flight all calls to Value will be handed the same task (which is cached temporarily but could subsequently succeed or fail); if the initializer succeeds then that completed task is cached permanently; if the initializer fails … Read more
JavaFX has Event Dispatch Thread which it uses for UI events. All work with UI should happen on this thread. And non-UI calculations shouldn’t happen there to avoid lags in UI. See next code: public class Indicators extends Application { public static void main(String[] args) { launch(args); } @Override public void start(Stage stage) { Pane … Read more
Added the answer that antonyt provided: @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); if ((getIntent().getFlags() & Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT) != 0) { // Activity was brought to front and not created, // Thus finishing this will get us to the last viewed activity finish(); return; } // Regular activity creation code… }
This is not Task Chaining. You need to do Task chaining using ContinueWith. Last task would need to update the UI. Task.Factory.StartNew( () => DoThis()) .ContinueWith((t1) => DoThat()) .ContinueWith((t2) => UpdateUi(), TaskScheduler.FromCurrentSynchronizationContext()); Note the last line has TaskScheduler.FromCurrentSynchronizationContext() this will ensure task will run in the synchronization context (UI Thread).
You absolutely want to use FromAsync when an API offers a BeginXXX/EndXXX version of a method. The difference is that, in the case of something like Stream or Socket or WebRequest, you’ll actually end up using async I/O underneath the covers (e.g. I/O Completion Ports on Windows) which is far more efficient than blocking multiple … Read more
Yes, any coroutine that’s running inside your event loop will block other coroutines and tasks from running, unless it Calls another coroutine using yield from or await (if using Python 3.5+). Returns. This is because asyncio is single-threaded; the only way for the event loop to run is for no other coroutine to be actively … Read more