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New video tutorial: 255570732 Resumable subs is a new feature added in B4J v5.50 / B4i v4.00 / B4A v7.00. It dramatically simplifies the handling of asynchronous tasks. (This feature is a variant of stackless coroutines.) The special feature of resumable subs is that they can be paused, without p
link: More examples: Running an external program with jShell without blocking the UI: Sub RunProcess Dim shl As Shell shl.Initialize("shl", "cmd", Ar
link: Tip: As explained in the first post, when one sub calls a second resumable sub, the code in the first sub will continue after the first Sleep or Wait
link: That's 100% correct. Quoting the tutorial: Whenever Sleep or Wait For are called, the current sub is paused. This is equivalent to calling Return. O

A pattern such as this one can be used when you want to run multiple resumable subs concurrently and wait for all of them to complete before continuing: Dim status(1) As Int Test1(status) Test2(status) Test3(status) Do While status(0) < 3 Sleep(50) Loop Log("all
link: Good to know, but this is a hack ? The resumable sub needs to be written specifically with the purpose of being used this way. A language construct (W
link: No. It cannot happen. The resumable subs run on the main thread like all other subs.
link: Correct me if I'm wrong, but this is similar to @Erel's "prefered timeout" (see here) which I spotted a while back and adopted :) - much more elegant

Remember that that a call to Sleep or Wait For in a resumable sub causes the code flow to return to the parent. Example: Sub Button1_Click Sum(1, 2) Log("after sum") End Sub Sub Sum(a As Int, b As Int) Sleep(100) 'this will cause the code flow to return to the parent Log(a + b) End Sub Output:
link: I thought resumable subs was a game changer but now with being able to return a value has taken it to the next level! I removed all of my callback cod
link: This Was One Of My Wishes You said Never And less than 3 Months You found a way to implement it. Who's finally the boss here ?
link: Hello! I've just received the 7.30 update and I've read the changelog and this post, and I still don't get the ResumableSub type advantage/need... I

Button1_Click in turn now calls Wait For on an event named ‘Complete’ which it expects to contain the actual return value from Sum which is an integer. After the invocation of Wait For it in turn immediately returns to the message loop which now has two Resumable Subs waiting for events and can now
link: In addition Sub FluxVP_NewData will not be executed as the Wait For will steal the event. Actually I'm a bit rusty on events and Resumable Subs and I'
link: May I re-open this thread as I have some issues with "wait for" waiting for data event. It seems possible as you write : I found several samples exp
link: This is a very good and detailed explanation of resumable subs. The code flow is visually demonstrated in the video tutorial: https://www.b4x.com/etp.

Whenever the sub instance is resumed after Sleep or Wait For we check whether MyIndex, which is a local variable specific to each sub instance, is the same as the global Label1Index variable. If not we immediately return. Result: https://www.b4x..gif As you can see the label is updated correctly

256583317 Downloading resources is simpler with the new Resumable Subs feature. Using Wait For we can wait for the JobDone event in the same sub that started the download. No longer is it needed to have a single sub that handles all requests results. Simplest example: Dim j As HttpJob j.Initiali
link: https://www.b4x.com/android/forum/threads/b4x-resumable-subs-sleep-wait-for.78601/
link: There is no such thing. There is only a JobDone event. This is why you need to check that Job.Success is true. This is handled in the above code. Th
link: Using wait for you need to Release the job after the wait for. NOT using wait for you must release it in JobDone. Dim j As HttpJob j.Initialize("", M

The new resumable subs feature, introduced in B4J v5.50, B4i v4.00 and B4A v7.00 (to be soon released), makes it simpler to work with large data sets with minimum effect on the program responsiveness. The new standard way to insert data is: For i = 1 To 1000 sql.AddNonQueryToBatch("INSERT INTO
link: The async methods are not faster than the synchronous methods. However they are executed in the background so they don't affect the main thread and do
link: The current SQLCipher library doesn't support asynchronous methods (with wait for or without it).
link: This doesn't seem to work with SQLCipher. Consider the following statement with regards to your first post 1. For i = 0 To cl.Size - 1 'cl is a lis

Platform specific API -> Cross platform API: This is of course relevant when there is a cross platform API. Some developers have a misconception that the cross platform features have drawbacks compared to the platform specific API. Node / Pane / Button / ... -> B4XView Canvas -> B4XCanvas All kinds

You can replace the Sleep calls in the "test" subs with Wait Fors. For example: BannerAd.LoadAd WaitForSuccess (status) WaitForFailure(status) Do While status(0) = "" Sleep(50) Loop Log("task completed: " & status(0)) Private Sub WaitForSuccess (Status() As String) Wait
link: Very helpful @Erel, thanks!

Private Sub B4XPage_Created (Root1 As B4XView) Root = Root1 Root.LoadLayout("MainPage") xui.SetDataFolder("Download large file") Downloader.Initialize Dim tracker As RangeDownloadTracker = Downloader.CreateTracker Track(tracker) Wait For (Downloader.Download(xui.DefaultFo
link: I had to modify the class to get download the file. The head.Response.ContentLength always returns 0. Public Sub Download (Dir As String, FileName A
link: If you are asking about the progress tracking then it is possible with: https://www.b4x.com/android/forum/threads/b4x-post-multipart-requests-file-upl
link: Try this: https://www.b4x.com/android/forum/threads/b4x-rangedownloader-resumable-downloads.133370/post-843050

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