public void AssignNullAfterDispose()
{
var d = new SingleAssignmentDisposable ();
d.Dispose ();
d.Disposable = null; // should not result in NRE, nor treated as if it assigned an instance.
d.Disposable = Disposable.Create (() => {});
}
public void AssignNull()
{
var d = new SingleAssignmentDisposable ();
d.Disposable = null;
d.Disposable = null; // allowed (no effect)
d.Disposable = Disposable.Create (() => {}); // should be allowed
}
public void AssignMultipleTimes()
{
int i = 0, j = 0;
var d = new SingleAssignmentDisposable ();
d.Disposable = Disposable.Create (() => i++);
d.Disposable = Disposable.Create (() => j++);
}
public void AssignMultipleOnceAfterDispose()
{
var d = new SingleAssignmentDisposable ();
d.Disposable = Disposable.Create (() => {});
d.Dispose ();
d.Disposable = Disposable.Create (() => {});
}
/// <summary>
/// Uses the double-indirection pattern to assign the disposable returned by the specified <paramref name="factory"/>
/// to the <see cref="SerialDisposable.Disposable"/> property of the specified <paramref name="disposable"/>.
/// </summary>
/// <remarks>
/// The double-indirection pattern avoids a race condition that can occur when the <paramref name="factory"/>
/// has a side-effect that causes the <see cref="SerialDisposable.Disposable"/> property of the specified
/// <paramref name="disposable"/> to be assigned before the <paramref name="factory"/> returns its disposable.
/// This pattern ensures that the disposable returned by the <paramref name="factory"/> does not replace the
/// disposable that was assigned by the <paramref name="factory"/>.
/// </remarks>
/// <param name="disposable">The object to which the disposable returned by the specified <paramref name="factory"/> is assigned.</param>
/// <param name="factory">Returns an <see cref="IDisposable"/> that is assigned to the specified <paramref name="disposable"/>.</param>
/// <seealso href="http://social.msdn.microsoft.com/Forums/en-IE/rx/thread/4e15feae-9c4c-4962-af32-95dde1420dda#4d5fe8c8-e5e8-4ee7-93ca-b48b6a56b8af">
/// Double indirection pattern example in Rx
/// </seealso>
public static void SetDisposableIndirectly(this SerialDisposable disposable, Func<IDisposable> factory)
{
Contract.Requires(disposable != null);
Contract.Requires(factory != null);
var indirection = new SingleAssignmentDisposable();
disposable.Disposable = indirection;
indirection.Disposable = factory();
}
public static IDisposable Schedule(this IScheduler scheduler, ILiveValue<TimeSpan> interval, Action action)
{
var startTime = HiResTimer.Now();
var gate = new object();
var hasValue = false;
var cancelable = new SerialDisposable();
var id = 0UL;
var observer =
interval.CreateObserver(
o => Publish.OnConsume(
() =>
{
// get new interval
var state = o.GetState();
// work out interval from here
var timeSpan = TimeSpan.Zero;
if (state.Status.IsConnected())
{
timeSpan = state.NewValue - HiResTimer.ToTimeSpan(HiResTimer.Now() - startTime);
if (timeSpan < TimeSpan.Zero)
timeSpan = TimeSpan.Zero;
}
// adapted from Observable.Throttle()
ulong currentid;
lock (gate)
{
hasValue = true;
id += 1UL;
currentid = id;
}
var timer = new SingleAssignmentDisposable();
cancelable.Disposable = timer;
timer.Disposable =
scheduler.Schedule(
timeSpan,
() =>
{
lock (gate)
{
if (hasValue && (id == currentid))
action();
hasValue = false;
}
});
})
);
interval.Subscribe(observer);
return new CompositeDisposable(new IDisposable[] { observer, cancelable });
}
public Timer(TimeSpan dueTime, Action action)
{
_disposable = new SingleAssignmentDisposable();
_disposable.Disposable = Disposable.Create(Unroot);
_action = action;
_timer = new System.Threading.Timer(Tick, null, dueTime, TimeSpan.FromMilliseconds(System.Threading.Timeout.Infinite));
lock (s_timers)
{
if (!_hasRemoved)
{
s_timers.Add(_timer);
_hasAdded = true;
}
}
}
public void SingleAssignmentDisposable_DisposeAfterSet()
{
var disposed = false;
var d = new SingleAssignmentDisposable();
var dd = Disposable.Create(() => { disposed = true; });
d.Disposable = dd;
Assert.AreSame(dd, d.Disposable);
Assert.IsFalse(disposed);
d.Dispose();
Assert.IsTrue(disposed);
d.Dispose();
Assert.IsTrue(disposed);
Assert.IsTrue(d.IsDisposed);
}
public void SingleAssignmentRxOfficial()
{
var d = new SingleAssignmentDisposable();
d.IsDisposed.IsFalse();
var id1 = new IdDisp(1);
var id2 = new IdDisp(2);
var id3 = new IdDisp(3);
// dispose first
d.Dispose();
d.IsDisposed.IsTrue();
d.Disposable = id1; id1.IsDisposed.IsTrue();
d.Disposable = id2; id2.IsDisposed.IsTrue();
d.Disposable = id3; id3.IsDisposed.IsTrue();
// normal flow
d = new SingleAssignmentDisposable();
id1 = new IdDisp(1);
id2 = new IdDisp(2);
id3 = new IdDisp(3);
d.Disposable = id1; id1.IsDisposed.IsFalse();
d.Dispose();
id1.IsDisposed.IsTrue();
d.Disposable = id2; id2.IsDisposed.IsTrue();
d.Disposable = id3; id3.IsDisposed.IsTrue();
// exception flow
d = new SingleAssignmentDisposable();
id1 = new IdDisp(1);
id2 = new IdDisp(2);
id3 = new IdDisp(3);
d.Disposable = id1;
AssertEx.Catch<InvalidOperationException>(() => d.Disposable = id2);
// null
d = new SingleAssignmentDisposable();
id1 = new IdDisp(1);
d.Disposable = null;
d.Dispose();
d.Disposable = null;
}
private static void Impl()
{
var rand = new Random();
for (int i = 0; i < 1000; i++)
{
var d = new SingleAssignmentDisposable();
var e = new ManualResetEvent(false);
var cd = new CountdownEvent(2);
var sleep1 = rand.Next(0, 1) == 0 ? 0 : rand.Next(2, 100);
var sleep2 = rand.Next(0, 1) == 0 ? 0 : rand.Next(2, 100);
ThreadPool.QueueUserWorkItem(_ =>
{
Helpers.SleepOrSpin(sleep1);
Console.Write("{DB} ");
d.Dispose();
Console.Write("{DE} ");
cd.Signal();
});
ThreadPool.QueueUserWorkItem(_ =>
{
Helpers.SleepOrSpin(sleep2);
Console.Write("{AB} ");
d.Disposable = Disposable.Create(() => e.Set());
Console.Write("{AE} ");
cd.Signal();
});
e.WaitOne();
cd.Wait();
Console.WriteLine(".");
}
}
private static void RefCountWithPost_(IEnumerable<Tuple<int, int>> parameters)
{
var worker = new Thread(() =>
{
SynchronizationContext.SetSynchronizationContext(new MySyncCtx());
foreach (var p in parameters)
{
var N = p.Item1;
var M = p.Item2;
Console.Write("N = {0}, M = {1} - ", N, M);
var bar = new Bar();
var foo = Observable.FromEventPattern<FooEventArgs>(h => { /*Console.Write("+");*/ bar.Foo += h; }, h => { bar.Foo -= h; /*Console.Write("-"); */});
var e = new ManualResetEvent(false);
var cd = new CountdownEvent(M * 2);
for (int i = 0; i < M; i++)
{
var f = new SingleAssignmentDisposable();
ThreadPool.QueueUserWorkItem(_ =>
{
f.Disposable = foo.Subscribe(__ => { /*Console.Write("!");*/ });
cd.Signal();
});
ThreadPool.QueueUserWorkItem(_ =>
{
f.Dispose();
cd.Signal();
});
}
var hasObserved = 0;
Console.Write("{SB}");
var d = foo.Subscribe(x =>
{
//
// [on BARTDE-M6500 with CPU and RAM pressure]
//
// Up to 8K concurrent observers, we typically don't see a time gap (expected worst-case behavior).
// The code below uses an event to check the desired behavior of eventually tuning in to the event stream.
//
Console.Write("&" + x.EventArgs.Qux);
e.Set();
Interlocked.Exchange(ref hasObserved, 1);
});
Console.Write("{SE}");
var t = new Thread(() =>
{
Console.Write("{TB}");
var i = 0;
while (Thread.VolatileRead(ref hasObserved) == 0)
bar.OnFoo(i++);
Console.Write("{TE}");
});
t.Start();
t.Join();
cd.Wait();
e.WaitOne();
d.Dispose();
Console.WriteLine(".");
}
});
worker.Start();
worker.Join();
}
private static void RefCount_(IEnumerable<Tuple<int, int>> parameters)
{
foreach (var p in parameters)
{
var N = p.Item1;
var M = p.Item2;
Console.Write("N = {0}, M = {1} - ", N, M);
var bar = new Bar();
var foo = Observable.FromEventPattern<FooEventArgs>(h => { Console.Write("+"); bar.Foo += h; }, h => { bar.Foo -= h; Console.Write("-"); });
var res = new List<int>();
var n = 0;
var e = new ManualResetEvent(false);
var cd = new CountdownEvent(M * 2);
for (int i = 0; i < M; i++)
{
var f = new SingleAssignmentDisposable();
ThreadPool.QueueUserWorkItem(_ =>
{
f.Disposable = foo.Subscribe(__ => { Console.Write("!"); });
cd.Signal();
});
ThreadPool.QueueUserWorkItem(_ =>
{
f.Dispose();
cd.Signal();
});
}
Console.Write("{SB}");
var d = foo.Subscribe(x =>
{
//Console.Write("&");
if (++n == N)
e.Set();
res.Add(x.EventArgs.Qux);
});
Console.Write("{SE}");
var t = new Thread(() =>
{
Console.Write("{TB}");
for (int i = 0; i < N; i++)
bar.OnFoo(i);
Console.Write("{TE}");
});
t.Start();
t.Join();
cd.Wait();
e.WaitOne();
d.Dispose();
if (!res.SequenceEqual(Enumerable.Range(0, N)))
{
Console.WriteLine("Panic!");
break;
}
Console.WriteLine(".");
}
}
public void SingleAssignmentDisposable_DisposeBeforeSet()
{
var disposed = false;
var d = new SingleAssignmentDisposable();
var dd = Disposable.Create(() => { disposed = true; });
Assert.IsFalse(disposed);
d.Dispose();
Assert.IsFalse(disposed);
Assert.IsTrue(d.IsDisposed);
d.Disposable = dd;
Assert.IsTrue(disposed);
//Assert.IsNull(d.Disposable); // BREAKING CHANGE v2 > v1.x - Undefined behavior after disposal.
d.Disposable.Dispose(); // This should be a nop.
d.Dispose();
Assert.IsTrue(disposed);
}
public void SingleAssignmentDisposable_SetNull()
{
var d = new SingleAssignmentDisposable();
d.Disposable = null;
}
public void SingleAssignmentDisposable_SetMultipleTimes()
{
var d = new SingleAssignmentDisposable();
d.Disposable = Disposable.Empty;
ReactiveAssert.Throws<InvalidOperationException>(() => { d.Disposable = Disposable.Empty; });
}
public void SchedulePeriodic()
{
var evt = new ManualResetEvent(false);
var id = Thread.CurrentThread.ManagedThreadId;
var disp = DispatcherHelpers.EnsureDispatcher();
var sch = new DispatcherScheduler(disp);
var d = new SingleAssignmentDisposable();
d.Disposable = sch.SchedulePeriodic(1, TimeSpan.FromSeconds(0.1), n =>
{
Assert.AreNotEqual(id, Thread.CurrentThread.ManagedThreadId);
if (n == 3)
{
d.Dispose();
sch.Schedule(TimeSpan.FromSeconds(0.2), () =>
{
Assert.AreNotEqual(id, Thread.CurrentThread.ManagedThreadId);
evt.Set();
});
}
if (n > 3)
{
Assert.Fail();
}
return n + 1;
});
evt.WaitOne();
disp.InvokeShutdown();
}
public void AssignOneThenNull()
{
var d = new SingleAssignmentDisposable ();
d.Disposable = Disposable.Create (() => {});
d.Disposable = null; // this is not allowed
}
public void Start(IHostController hostController) {
AppHosting.SetupChannel();
var d = new SingleAssignmentDisposable();
if (keepAlive) {
d.Disposable = Observable.Interval(TimeSpan.FromMilliseconds(500))
.Subscribe(i => {
try {
if (!hostController.isAlive()) {
d.Dispose();
Process.GetCurrentProcess().Kill();
}
} catch (Exception err) {
dbg.Error(err);
Process.GetCurrentProcess().Kill();
}
});
}
var live555 = new Live555(videoBuffer, metadataReceiver);
live555.Play(mediaStreamInfo, playbackController);
d.Dispose();
}
public void SchedulePeriodic_Nested()
{
var evt = new ManualResetEvent(false);
var id = Thread.CurrentThread.ManagedThreadId;
var lbl = CreateLabel();
var sch = new ControlScheduler(lbl);
sch.Schedule(() =>
{
lbl.Text = "Okay";
var d = new SingleAssignmentDisposable();
d.Disposable = sch.SchedulePeriodic(1, TimeSpan.FromSeconds(0.1), n =>
{
lbl.Text = "Okay " + n;
Assert.NotEqual(id, Thread.CurrentThread.ManagedThreadId);
if (n == 3)
{
d.Dispose();
sch.Schedule(TimeSpan.FromSeconds(0.2), () =>
{
Assert.Equal("Okay 3", lbl.Text);
Assert.NotEqual(id, Thread.CurrentThread.ManagedThreadId);
evt.Set();
});
}
return n + 1;
});
});
evt.WaitOne();
Application.Exit();
}
public IDisposable Play(MediaStreamInfo mediaStreamInfo, IPlaybackController playbackController) {
//fix url
var url = new Uri(mediaStreamInfo.url);
if (url == null || !url.IsAbsoluteUri) {
throw new Exception("Invalid playback url");
}
if (mediaStreamInfo.transport != MediaStreamInfo.Transport.Http) {
if (String.Compare(url.Scheme, "rtsp", true) != 0) {
throw new Exception("Invalid playback url");
}
} else if (String.Compare(url.Scheme, "rtsp", true) != 0) {
int defPort;
if (String.Compare(url.Scheme, Uri.UriSchemeHttp, true) == 0) {
defPort = 80;
} else if (String.Compare(url.Scheme, Uri.UriSchemeHttps, true) == 0) {
defPort = 443;
} else {
throw new Exception("Invalid playback url");
}
var ub = new UriBuilder(url);
ub.Scheme = "rtsp";
if (ub.Port == -1) {
ub.Port = defPort;
}
url = ub.Uri;
mediaStreamInfo = new MediaStreamInfo(url.ToString(), mediaStreamInfo.transport, mediaStreamInfo.userNameToken);
}
var disposable = new SingleAssignmentDisposable();
playerTask.mediaStreamInfo = mediaStreamInfo;
playerTask.playbackController = playbackController;
if (playerHost != null) {
playerHost.Dispose();
RemotingServices.Disconnect(playerHost);
playerHost = null;
}
playerHost = new PlayerHost(playerTask);
RemotingServices.Marshal(playerHost);
var ipcChannel = AppHosting.SetupChannel();
var hostControllerUri = RemotingServices.GetObjectUri(playerHost);
var hostControllerUrl = ipcChannel.GetUrlsForUri(hostControllerUri).First();
//start player host process
var hostProcessArgs = new CommandLineArgs();
var t = Uri.EscapeDataString(hostControllerUrl);
hostProcessArgs.Add("controller-url", new List<string> { hostControllerUrl });
var pi = new ProcessStartInfo() {
FileName = Assembly.GetExecutingAssembly().Location,
UseShellExecute = false,
Arguments = String.Join(" ", hostProcessArgs.Format()),
};
pi.EnvironmentVariables["PATH"] = String.Join("; ", Bootstrapper.specialFolders.dlls.Select(sfd => sfd.directory.FullName).Append(pi.EnvironmentVariables["PATH"]));
StartHostProcess(pi);
return Disposable.Create(() => {
Dispose();
});
}
