Implement callback through ApplicationDomain border in .net

Question

I load the dll dynamically using Applicationdomain to unload when necessary. I cannot work, this is the callback method from the generated Appdomain if the task in the loaded dll completes.

What am i still

public interface IBootStrapper
{
    void AsyncStart();
    void StopAndWaitForCompletion();

    event EventHandler TerminatedItself;
}

and starter side

private static Procedure CreateDomainAndStartExecuting()
{
  AppDomain domain = AppDomain.CreateDomain("foo", null, CODEPATH, string.Empty, true);
  IBootStrapper strapper = (IBootStrapper)domain.CreateInstanceAndUnwrap(DYNAMIC_ASSEMBLY_NAME, CLASSNAME);
  strapper.ClosedItself += OnClosedItself;
  strapper.AsyncStart();

  return delegate
  {
      strapper.StopAndWaitForCompletion();
      AppDomain.Unload(domain);
  };
}

which leads to a failure not found in the assembly, because OnClosedItself () is a type method that is known only to Starter, which is not in the appdomain.

If I end OnClosedItself as a delegate in a serializable class, then that too.

Any suggestions?

: , , - . , , . ​​ , .

//

2: . .

Answer 1

, , ( IBoostrapper). , , ...

, Mutex? AppDomains...

EDIT:

Appdomain, , WaitOne(), .

, , Mutex Appdomain IBootstrapper, . CreateInstanceAndUnwrap , Bootstrapper. , ( OpenExisting, , ), WaitOne . AppDomain , , Appdomain .

, AppDomains. MSute Mutex

EDIT: , . . , - ..... AppDomain . , , AppDomain , .

class Program
{
    static void Main(string[] args)
    {
        Semaphore semaphore = new Semaphore(0, 1, "SharedSemaphore");
        var domain = AppDomain.CreateDomain("Test");

        Action callOtherDomain = () =>
            {
                domain.DoCallBack(Callback);
            };
        callOtherDomain.BeginInvoke(null, null);
        semaphore.WaitOne();
        // Once here, you should evaluate whether to exit the application, 
        //  or perform the task again (create new domain again?....)
    }

    static void Callback()
    {
        var sem = Semaphore.OpenExisting("SharedSemaphore");
        Thread.Sleep(10000);
        sem.Release();
    }
}

Answer 2

, , , , . , MarshalByRefObject

, , , domaindomain

/// <summary>
/// An interface that the RealtimeRunner can use to notify a hosting service that it has failed
/// </summary>
public interface IFailureNotifier
{
    /// <summary>
    /// Notify the owner of a failure
    /// </summary>
    void NotifyOfFailure();
}

, appdomain, , MarshalByRefObject:

/// <summary>
/// Proxy used to get a call from the child appdomain into this appdomain
/// </summary>
public sealed class FailureNotifier: MarshalByRefObject, IFailureNotifier
{
    private static readonly Logger Log = LogManager.GetCurrentClassLogger();

    #region IFailureNotifier Members

    public void NotifyOfFailure()
    {
        Log.Warn("Received NotifyOfFailure in RTPService");

        // Must call from threadpool thread, because the PerformMessageAction unloads the appdomain that called us, the thread would get aborted at the unload call if we called it directly
        Task.Factory.StartNew(() => {Processor.RtpProcessor.PerformMessageAction(ProcessorMessagingActions.Restart, null);});
    }

    #endregion
}

, appdomain, FailureNotifier(). MarshalByRefObject , , , appdomain . ,

_runner = RealtimeRunner.CreateInNewThreadAndAppDomain(
    operationalRange,
    _rootElement.Identifier,
    Settings.Environment,
    new FailureNotifier());

...

/// <summary>
/// Create a new realtime processor, it loads in a background thread/appdomain
/// After calling this the RealtimeRunner will automatically do an initial run and then enter and event loop waiting for events
/// </summary>
/// <param name="flowdayRange"></param>
/// <param name="rootElement"></param>
/// <param name="environment"></param>
/// <returns></returns>
public static RealtimeRunner CreateInNewThreadAndAppDomain(
    DateTimeRange flowdayRange,
    byte rootElement,
    ApplicationServerMode environment,
    IFailureNotifier failureNotifier)
{
    string runnerName = string.Format("RealtimeRunner_{0}_{1}_{2}", flowdayRange.StartDateTime.ToShortDateString(), rootElement, environment);

    // Create the AppDomain and MarshalByRefObject
    var appDomainSetup = new AppDomainSetup()
    {
        ApplicationName = runnerName,
        ShadowCopyFiles = "false",
        ApplicationBase = Environment.CurrentDirectory,
    };
    var calcAppDomain = AppDomain.CreateDomain(
        runnerName,
        null,
        appDomainSetup,
        new PermissionSet(PermissionState.Unrestricted));

    var runnerProxy = (RealtimeRunner)calcAppDomain.CreateInstanceAndUnwrap(
        typeof(RealtimeRunner).Assembly.FullName,
        typeof(RealtimeRunner).FullName,
        false,
        BindingFlags.NonPublic | BindingFlags.Instance,
        null,
        new object[] { flowdayRange, rootElement, environment, failureNotifier },
        null,
        null);

    Thread runnerThread = new Thread(runnerProxy.BootStrapLoader)
    {
        Name = runnerName,
        IsBackground = false
    };
    runnerThread.Start();

    return runnerProxy;
}

Answer 3

Haplo

// In DYNAMIC_ASSEMBLY_NAME
class Bootstrapper : IBootStrapper
{
    public void AsyncStart()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);

        m_task = new MyTask();

        m_thread = new Thread(delegate()
        {
            m_task.Run();
            if (m_task.Completed)
                Semaphore.OpenExisting(KeepAliveStarter.SEMAPHORE_NAME).Release();
        });
        thread.Start();
    }

    public void StopAndWaitForCompletion()
    {
        m_task.Shutdown();
        m_thread.Join();
    }
}

// in starter
private static Procedure CreateDomainAndStartExecuting()
{
  AppDomain domain = AppDomain.CreateDomain("foo", null, CODEPATH, string.Empty, true);
  IBootStrapper strapper = (IBootStrapper)domain.CreateInstanceAndUnwrap(DYNAMIC_ASSEMBLY_NAME, CLASSNAME);
  strapper.AsyncStart();

  return delegate
  {
      strapper.StopAndWaitForCompletion();
      AppDomain.Unload(domain);
  };
}

static void Main(string[] args)
{
    var semaphore = new Semaphore(0, 1, KeepAliveStarter.SEMAPHORE_NAME);
    DateTime lastChanged = DateTime.MinValue;
    FileSystemEventHandler codeChanged = delegate
    {
        if ((DateTime.Now - lastChanged).TotalSeconds < 2)
            return;
        lastChanged = DateTime.Now;
        Action copyToStopCurrentProcess = onStop;
        onStop = CreateDomainAndStartExecuting();
        ThreadPool.QueueUserWorkItem(delegate
        {
            copyToStopCurrentProcess();
        });
    };
    FileSystemWatcher watcher = new FileSystemWatcher(CODEPATH, ASSEMBLY_NAME + ".dll");
    watcher.Changed += codeChanged;
    watcher.Created += codeChanged;

    onStop = CreateDomainAndStartExecuting();

    watcher.EnableRaisingEvents = true;

    semaphore.WaitOne();

    onStop();
}