Cancel Sync

[workgroupengineering]

follow-up to discussion #836
I use OnRowsChangesSelected to collect attachments to upload/download and send them via wep api. I would like to cancel sync if attachment upload/downlod fails and revert sync changes. I can do it?

[Mimetis]

I used this code for your scenario, where the input from the console decides if we are cancelling or not:

var progress = new SynchronousProgress<ProgressArgs>(s =>
    Console.WriteLine($"{s.ProgressPercentage:p}:  " +
    $"\t[{s?.Source?[..Math.Min(4, s.Source.Length)]}] {s.TypeName}: {s.Message}"));

options.DisableConstraintsOnApplyChanges = true;
options.TransactionMode = TransactionMode.PerBatch;

var agent = new SyncAgent(clientProvider, serverProvider, options);

CancellationTokenSource cts = null;

agent.LocalOrchestrator.OnRowsChangesSelected(rcsa =>
{
    Console.WriteLine($"OnRowsChangesSelected: {rcsa.SyncRow}");

    Console.Write("Cancel sync ? [Y] / [N]: ");
    var key = Console.ReadKey();
    Console.WriteLine();
    
    if (key != null && key.Key == ConsoleKey.Y)
        cts.Cancel();
});

do
{
    try
    {
        Console.ForegroundColor = ConsoleColor.Green;
        cts = new CancellationTokenSource();
        var s = await agent.SynchronizeAsync(scopeName, setup, SyncType.Normal, null, cts.Token, progress);
        Console.WriteLine(s);
    }
    catch (SyncException e)
    {
        Console.ResetColor();
        Console.WriteLine(e.Message);
    }
    catch (Exception e)
    {
        Console.ResetColor();
        Console.WriteLine("UNKNOW EXCEPTION : " + e.Message);
    }
    Console.WriteLine("--------------------");
} while (Console.ReadKey().Key != ConsoleKey.Escape);

I've added a row in the client database, then I rollback the sync two times, then I eventually make a complete sync: