Keyed Lock in .Net

Question

I have a Azure Service Bus queue where I\'m receiving a range from 1 to 10 messages with the same \"key\". One of these messages needs to be processed with a long running operat

Answer 1

You're nearly there... do you need the incoming order preserved? If not:

public static void Main(string[] args)
{
    Enumerable.Range(1, 1000)
                .AsParallel()
                .ForAll( i => ManageConcurrency(i % 2,  () => Task.Delay(TimeSpan.FromSeconds(10))).Wait());


}

private static readonly ConcurrentDictionary _lockDict = new ConcurrentDictionary();

private static async Task ManageConcurrency(int taskId, Func task)
{

    var gate = _lockDict.GetOrAdd(taskId, _ => new SemaphoreSlim(1, 1));
    await gate.WaitAsync();

    try
    {

        Console.WriteLine($"{DateTime.Now.ToString("hh:mm:ss.ffffff")},  {taskId}, Lock pulled for TaskId {taskId}, Thread Id: {System.Threading.Thread.CurrentThread.ManagedThreadId}");

        await task();

        return true;
    }
    catch (Exception e)
    {
        return false;
    }
    finally
    {
        gate.Release();
    }

}