public IObservable<Unit> Fetch (Request request)
{
return Observable.Create<Unit> (o => {
var description = request.DescriptionAs<ScaledDescription> ();
var url = new NSUrl (description.AbsoluteSourceUrl.AbsoluteUri);
var disp = new CancellationDisposable ();
var token = disp.Token;
Task.Factory.StartNew (() => {
using (var source = CGImageSource.FromUrl (url)) {
if (source.Handle == IntPtr.Zero)
throw new Exception (string.Format ("Could not create source for '{0}'", url));
var sourceSize = ImageHelper.Measure (source);
int maxPixelSize = GetMaxPixelSize (sourceSize, description.Size);
using (var scaled = CreateThumbnail (source, maxPixelSize, token))
using (var cropped = ScaleAndCrop (scaled, description.Size, description.Mode, token))
SaveToRequest (cropped, source.TypeIdentifier, request);
o.OnCompleted ();
}
}, token).RouteExceptions (o);
return disp;
});
}
private static IDisposable ScheduledMethod(IObserver<int> o)
{
var cancel = new CancellationDisposable();
// internally creates a new CancellationTokenSource
NewThreadScheduler.Default.Schedule(() =>
{
int i = 0;
for (;;)
{
Thread.Sleep(200);
// here we do the long lasting background operation
if (!cancel.Token.IsCancellationRequested)
// check cancel token periodically
o.OnNext(i++);
else
{
Console.WriteLine(
"Aborting because cancel event was signaled!");
o.OnCompleted();
return;
}
}
}
);
return cancel;
}
public static void CancelingAnAsynchronousOperation()
{
IObservable<int> ob =
Observable.Create<int>(o =>
{
var cancel = new CancellationDisposable(); // internally creates a new CancellationTokenSource
NewThreadScheduler.Default.Schedule(() =>
{
int i = 0;
for (;;)
{
Thread.Sleep(200); // here we do the long lasting background operation
if (!cancel.Token.IsCancellationRequested) // check cancel token periodically
o.OnNext(i++);
else
{
Console.WriteLine("Aborting because cancel event was signaled!");
o.OnCompleted();
return;
}
}
}
);
return cancel;
}
);
IDisposable subscription = ob.Subscribe(i => Console.WriteLine(i));
Console.WriteLine("Press any key to cancel");
Console.ReadKey();
subscription.Dispose();
Console.WriteLine("Press any key to quit");
Console.ReadKey(); // give background thread chance to write the cancel acknowledge message
}
IObservable<Unit> SaveThumbnailToFile (FileRequest request)
{
return Observable.Create<Unit> (o => {
var description = request.DescriptionAs<AssetDescription> ();
var disp = new CancellationDisposable ();
var token = disp.Token;
GetAsset (description, token).ContinueWith (t => {
var saveUrl = NSUrl.FromFilename (request.Filename);
using (var asset = t.Result)
using (var representation = asset.DefaultRepresentation)
using (var thumbnail = new UIImage (asset.Thumbnail))
using (var destination = CGImageDestination.FromUrl (saveUrl, representation.Uti, 1))
using (var cgImage = thumbnail.CGImage) {
destination.AddImage (cgImage, new NSMutableDictionary {
{ CGImageProperties.Orientation, NSNumber.FromInt32 (ImageHelper.ToExifOrientation (thumbnail.Orientation)) }
});
destination.Close ();
}
o.OnCompleted ();
}, token).RouteExceptions (o);
return disp;
});
}
public static void ShowAddPackageDialog(string selectedFileName, string projectGuid = null)
{
Paket.Dependencies dependenciesFile = null;
try
{
dependenciesFile = Paket.Dependencies.Locate(selectedFileName);
}
catch (Exception)
{
var dir = new System.IO.FileInfo(SolutionExplorerExtensions.GetSolutionFileName()).Directory.FullName;
Dependencies.Init(dir);
dependenciesFile = Paket.Dependencies.Locate(selectedFileName);
}
var secondWindow = new AddPackage();
//Create observable paket trace
var paketTraceObs = Observable.Create<Logging.Trace>(observer =>
{
[email protected](x => observer.OnNext(x));
return Disposable.Create(() =>
{
});
});
Action<NugetResult> addPackageToDependencies = result =>
{
if (projectGuid != null)
{
var guid = Guid.Parse(projectGuid);
SolutionExplorerExtensions.UnloadProject(guid);
dependenciesFile.AddToProject(Microsoft.FSharp.Core.FSharpOption<string>.None, result.PackageName, "", false, false, false, false, selectedFileName, true, SemVerUpdateMode.NoRestriction);
SolutionExplorerExtensions.ReloadProject(guid);
}
else
dependenciesFile.Add(Microsoft.FSharp.Core.FSharpOption<string>.None, result.PackageName, "", false, false, false, false, false, true, SemVerUpdateMode.NoRestriction);
};
Func<string, IObservable<string>> searchNuGet =
searchText => Observable.Create<string>(obs =>
{
var disposable = new CancellationDisposable();
dependenciesFile
.SearchPackagesByName(
searchText,
FSharpOption<CancellationToken>.Some(disposable.Token),
FSharpOption<int>.None)
.Subscribe(obs);
return disposable;
});
//TODO: Use interfaces?
secondWindow.ViewModel = new AddPackageViewModel(searchNuGet, addPackageToDependencies, paketTraceObs);
secondWindow.ShowDialog();
}
protected override void Main()
{
if (Environment.OSVersion.Version < new Version(6, 2))
{
TraceError(Text.LabRequiresWindows8OrHigher);
return;
}
const int port = 5494;
string subProtocol = GetType().Name;
var userMessages = new BehaviorSubject<string>(null);
var client = new ClientWebSocket();
client.Options.AddSubProtocol(subProtocol);
using (client)
using (var cancel = new CancellationDisposable())
using (ObservableHttpListener
.StartWebSockets(new IPEndPoint(IPAddress.Loopback, port), subProtocol)
.Subscribe(
async request =>
{
using (var socket = request.WebSocket)
{
try
{
var message = await ReceiveMessageAsync(socket, cancel.Token);
await SendMessageAsync("You sent \"" + message + "\"", socket, cancel.Token);
await ReceiveCloseMessageAsync(socket, cancel.Token);
}
catch (OperationCanceledException)
{
}
}
},
TraceError))
using ((from _ in client.ConnectAsync(new Uri("ws://localhost:" + port), cancel.Token).ToObservable()
.Do(_ => TraceLine(Environment.NewLine + "(Connected to host on sub-protocol \"{0}\")", client.SubProtocol))
from message in userMessages.Where(m => m != null).Take(1)
from __ in SendMessageAsync(message, client, cancel.Token).ToObservable()
from response in ReceiveMessageAsync(client, cancel.Token).ToObservable()
.Do(___ => client.CloseAsync(WebSocketCloseStatus.NormalClosure, "Done", cancel.Token))
select response)
.Subscribe(
response => TraceLine("Response: {0}", response),
TraceError,
() => TraceLine("{0}: {1}", Text.Client, Text.Done)))
{
userMessages.OnNext(UserInput("{0}> ", Instructions.EnterAMessage));
TraceStatus(Instructions.PressAnyKeyToCancel);
WaitForKey();
}
}
/// <summary>
/// Instantiates the <see cref="ProgressDialog"/>.
/// </summary>
/// <param name="title">The title.</param>
/// <param name="message">The message.</param>
public ProgressDialog(string title, string message)
{
InitializeComponent();
Heading = title;
Message = message;
_cancellationDisposable = new CancellationDisposable();
}
public override long RunPass()
{
var ob = Observable.Create<long>(o =>
{
var cancel = new CancellationDisposable(); // internally creates a new CancellationTokenSource
Scheduler.Default.Schedule(() =>
{
for (long i = 0; i < Iterations; i++)
{
//Thread.Sleep(200); // here we do the long lasting background operation
if (!cancel.Token.IsCancellationRequested) // check cancel token periodically
o.OnNext(i++);
else
{
Console.WriteLine("Aborting because cancel event was signaled!");
o.OnCompleted();
return;
}
}
}
);
return cancel;
}
);
_disruptor.Start();
var sw = Stopwatch.StartNew();
var subscription = ob.Subscribe(i =>
{
var sequence = _ringBuffer.Next();
_ringBuffer[sequence].Value = i;
_ringBuffer.Publish(sequence);
});
//这里取消任务
//subscription.Dispose();
//for (long i = 0; i < Iterations; i++)
//{
// var sequence = _ringBuffer.Next();
// _ringBuffer[sequence].Value = i;
// _ringBuffer.Publish(sequence);
//}
_mru.WaitOne();
var opsPerSecond = (Iterations * 1000L) / sw.ElapsedMilliseconds;
_disruptor.Shutdown();
Assert.AreEqual(ExpectedResult, _fizzBuzzEventHandler.FizzBuzzCounter);
return opsPerSecond;
}
public IObservable<Unit> Fetch (Request request)
{
return Observable.Create<Unit> (o => {
var client = new DBRestClient (DBSession.SharedSession);
var cancel = new CancellationDisposable ();
var fileRequest = request as FileRequest;
if (fileRequest == null)
throw new NotImplementedException ("DropboxSource only supports saving images to disk");
var subscription = StartDropboxTask (client, fileRequest, cancel.Token)
.ToObservable ()
.Subscribe (o);
return new CompositeDisposable (client, cancel, subscription);
});
}
private bool BaseExecute(CancellationDisposable cancellation)
{
//start timer
if (WatchDog != null)
{
WatchDog.Enabled = true;
WatchDog.Start();
}
bool success = Execute(cancellation);
if (WatchDog != null)
{
WatchDog.Enabled = false;
WatchDog.Stop();
}
return success;
}
protected abstract bool Execute(CancellationDisposable cancellation);
protected override bool Execute(CancellationDisposable cancellation)
{
TraceMessage("Execute");
Thread.Sleep(3000);
return true;
}
public MessageToken()
{
Cancellation = new CancellationDisposable();
InErrorState = new BooleanDisposable();
}
private CancellationDisposable QueueMechanism(IObserver<QueueStates> observer)
{
var cancellation = new CancellationDisposable();
// internally creates a new CancellationTokenSource
NewThreadScheduler.Default.Schedule((t) =>
{
QueueStates state = QueueStates.StartUp;
for (; ; )
{
bool success = ExecuteStateLogic(state, cancellation);
if (cancellation.Token.IsCancellationRequested)
{
state = state == QueueStates.Teardown
? GetNextState(state)
: QueueStates.Teardown;
}
else if (success)
state = GetNextState(state);
else
state = QueueStates.Error;
if (state == QueueStates.WaitingForTrigger)
{
}
else if (state != QueueStates.Stopped)
observer.OnNext(state);
else
{
TraceMessage("--**-- Stopped --**--");
observer.OnCompleted();
return;
}
//// here we do the long lasting background operation
//if (!cancellation.Token.IsCancellationRequested)
//{
// // check cancel token periodically
//}
//else
//{
// TraceMessage("Aborting because cancel event was signaled!");
// observer.OnCompleted();
// return;
//}
}
}
);
return cancellation;
}
private bool ExecuteStateLogic(QueueStates state, CancellationDisposable cancellation)
{
switch (state)
{
case QueueStates.StartUp:
return true;
case QueueStates.Initializing:
return Initialize();
case QueueStates.WaitingForTrigger:
return true;
case QueueStates.Executing:
return BaseExecute(cancellation);
case QueueStates.Teardown:
return Teardown();
case QueueStates.Stopped:
// not used
return true;
case QueueStates.Error:
OnError("-- illogical flow --");
return true;
default:
return false;
}
}
IObservable<Unit> SaveFullResolutionImageToMemory (MemoryRequest request)
{
return Observable.Create<Unit> (o => {
var description = request.DescriptionAs<AssetDescription> ();
var disp = new CancellationDisposable ();
var token = disp.Token;
GetAsset (description, token).ContinueWith (t => {
using (var asset = t.Result)
using (var representation = asset.DefaultRepresentation)
request.Image = new UIImage (representation.GetImage ());
o.OnCompleted ();
}, token).RouteExceptions (o);
return disp;
});
}
private async Task ExecuteAsync(object current, Func<CancellationToken, Task> action, CancellationToken token)
{
// Create a task completion source.
var doneTaskSource = new TaskCompletionSource<bool>();
// Set the "current task".
var doneTask = doneTaskSource.Task;
// Local variables for the switch state.
var active = default(object);
var currentTask = default(Task);
var cancelSwitch = default(CancellationDisposable);
// Enter the lock and update the switch state.
lock (_gate)
{
// If nothing is active, the current call becomes active.
if (_active == null)
{
_active = active = current;
currentTask = _currentTask = doneTask;
_serialDisposable.Disposable = cancelSwitch = _cancelSwitch = new CancellationDisposable();
}
// If the current call is the active kind, repeat and add a continuation.
else if (_active == current)
{
active = _active;
cancelSwitch = _cancelSwitch;
currentTask = _currentTask = doneTask = _currentTask.ContinueWith(_ => doneTaskSource.Task).Unwrap();
}
// Otherwise, set the local variables for awaiting.
else
{
active = _active;
currentTask = _currentTask;
cancelSwitch = _cancelSwitch;
}
}
// If the current task is not active, cancel the active task and try again.
if (active != current)
{
cancelSwitch.Dispose();
await currentTask;
await ExecuteAsync(current, action, token);
}
// Else, run the current task.
else
{
using (var localCancellationSource = new CancellationDisposable())
using (cancelSwitch.Token.Register(localCancellationSource.Dispose))
using (token.Register(localCancellationSource.Dispose))
{
try
{
await action(localCancellationSource.Token);
}
catch (OperationCanceledException ex)
{
if (ex.CancellationToken != localCancellationSource.Token)
{
throw;
}
token.ThrowIfCancellationRequested();
if (_serialDisposable.IsDisposed)
{
throw new ObjectDisposedException("SwitchBlock");
}
}
finally
{
lock (_gate)
{
// If the current task is the final task, reset the active task.
if (_currentTask == doneTask)
{
_active = null;
}
}
doneTaskSource.SetResult(true);
}
}
}
}
/// <summary>
/// same as the previous "TestBoolDisposable", but the message that "production completes" NEVRE shows
/// so it is much more clear that it is the Take operator notify the observer to complete
/// NOT the original source
/// </summary>
private static void TestCancelDisposable(int total, int expected)
{
IObservable<int> source = Observable.Create<int>(observer =>
{
CancellationDisposable disposable = new CancellationDisposable();
Task.Factory.StartNew(() =>
{
for (int index = 0; index < total; index++)
{
disposable.Token.ThrowIfCancellationRequested();
observer.Consume(index);
}
observer.OnCompleted();
Console.WriteLine("[ NEVER DISPLAYED ] production completes.");
}, disposable.Token);
return disposable;
});
source.ConsumeSome(expected);
Helper.Pause();
}
/// <summary>
/// Create With Disposable & Scheduler - Canceling an asynchronous operation
/// </summary>
public static void DisposableScheduler()
{
IObservable<int> ob =
Observable.Create<int>(o =>
{
var cancel = new CancellationDisposable();
NewThreadScheduler.Default.Schedule(() =>
{
int i = 0;
while (!cancel.Token.IsCancellationRequested)
{
Thread.Sleep(200);
o.OnNext(i++);
}
Console.WriteLine("Aborting because cancel evente was signled.");
o.OnCompleted();
});
return cancel;
});
IDisposable subscription = ob.Subscribe(i => Console.WriteLine("\t{0:000}",i));
Console.WriteLine("Press any key to cancel");
Console.ReadKey();
subscription.Dispose();
Console.WriteLine("Background should be cleaned up by now, Press any key to quit");
Console.ReadKey(); // give background thread chance to write cancel message
}
public IObservable<MimeMessage> Get(MessageEntry messageEntry)
{
_logger.Verbose("Loading Message Entry {@MessageEntry}", messageEntry);
return Observable.Create<MimeMessage>(
o =>
{
// in case of multiple subscriptions...
var observer = Observer.Synchronize(o, true);
var disposable = new CancellationDisposable();
MimeMessage message = null;
try
{
message = MimeMessageCache.GetOrSet(
messageEntry.File,
() =>
{
_logger.Verbose(
"Getting Message Data from Cached Message Repository",
messageEntry);
var messageData = _messageRepository.GetMessage(messageEntry);
MimeMessage mimeMessage;
// wrap in a memorystream...
using (var ms = new MemoryStream(messageData))
{
_logger.Verbose(
"MimeMessage Load for {@MessageEntry}",
messageEntry);
mimeMessage = MimeMessage.Load(
ParserOptions.Default,
ms,
disposable.Token);
}
return mimeMessage;
},
m =>
{
var policy = new CacheItemPolicy
{
SlidingExpiration = TimeSpan.FromSeconds(10)
};
MimeMessageCache.Add(messageEntry.File, m, policy);
});
}
catch (OperationCanceledException)
{
// no need to respond...
}
catch (Exception ex)
{
_logger.Error(ex, "Exception Loading {@MessageEntry}", messageEntry);
observer.OnError(ex);
}
if (message != null)
{
observer.OnNext(message);
observer.OnCompleted();
}
return disposable;
}).SubscribeOn(TaskPoolScheduler.Default);
}
IObservable<Unit> SaveThumbnailToMemory (MemoryRequest request)
{
return Observable.Create<Unit> (o => {
var description = request.DescriptionAs<AssetDescription> ();
var disp = new CancellationDisposable ();
var token = disp.Token;
GetAsset (description, token).ContinueWith (t => {
using (var asset = t.Result)
request.Image = new UIImage (asset.Thumbnail);
o.OnCompleted ();
}, token).RouteExceptions (o);
return disp;
});
}
public void CancellationDisposable_DefaultCtor()
{
var c = new CancellationDisposable();
Assert.IsNotNull(c.Token);
Assert.IsFalse(c.Token.IsCancellationRequested);
Assert.IsTrue(c.Token.CanBeCanceled);
c.Dispose();
Assert.IsTrue(c.IsDisposed);
Assert.IsTrue(c.Token.IsCancellationRequested);
}
protected override long RunDisruptorPass()
{
var ob = Observable.Create<long>(o =>
{
var cancel = new CancellationDisposable(); // internally creates a new CancellationTokenSource
Scheduler.Default.Schedule(() =>
{
for (long i = 0; i < ITERATIONS; i++)
{
//Thread.Sleep(200); // here we do the long lasting background operation
if (!cancel.Token.IsCancellationRequested) // check cancel token periodically
o.OnNext(i++);
else
{
Console.WriteLine("Aborting because cancel event was signaled!");
o.OnCompleted();
return;
}
}
}
);
return cancel;
}
);
var spinwait = default(SpinWait);
//var latch = new CountdownEvent(1);
var latch = new ManualResetEvent(false);
var expectedCount = myRunnable.GetSequence.Value + ITERATIONS;
myRunnable.Reset(latch, expectedCount);
var _scheduler = new RoundRobinThreadAffinedTaskScheduler(4);
//TaskScheduler.Default调度器 CPU 约在 50 % 两个繁忙，两个空闲
//
Task.Factory.StartNew(myRunnable.Run, CancellationToken.None, TaskCreationOptions.None,TestTaskScheduler);
var start = Stopwatch.StartNew();
var sequencer = this.sequencer;
//var range = Observable.Range(0, 1000 * 1000 * 100, Scheduler.Default)
// .Subscribe(i => {
// long next = sequencer.Next();
// sequencer.Publish(next);
// });
// var subscription = ob.Subscribe(i =>
for (long i = 0; i < ITERATIONS; i++)
{
long next = sequencer.Next();
sequencer.Publish(next);
}
//);
latch.WaitOne();
long opsPerSecond = (ITERATIONS * 1000L) / start.ElapsedMilliseconds;
WaitForEventProcessorSequence(expectedCount, spinwait,myRunnable);
return opsPerSecond;
}
public void CancellationDisposable_TokenCtor()
{
var t = new CancellationTokenSource();
var c = new CancellationDisposable(t);
Assert.IsTrue(t.Token == c.Token);
Assert.IsFalse(c.Token.IsCancellationRequested);
Assert.IsTrue(c.Token.CanBeCanceled);
c.Dispose();
Assert.IsTrue(c.IsDisposed);
Assert.IsTrue(c.Token.IsCancellationRequested);
}
IObservable<Unit> SaveFullResolutionImageToFile (FileRequest request)
{
return Observable.Create<Unit> (o => {
var description = request.DescriptionAs<AssetDescription> ();
var disp = new CancellationDisposable ();
var token = disp.Token;
GetAsset (description, token).ContinueWith (t => {
using (File.Create (request.Filename))
using (var asset = t.Result)
using (var representation = asset.DefaultRepresentation)
using (var stream = new NSOutputStream (request.Filename, true)) {
stream.Open ();
long offset = 0;
uint bytesRead = 0;
NSError err;
// A large enough buffer that shouldn't cause memory warnings
byte [] buffer = new byte [131072];
GCHandle handle = GCHandle.Alloc (buffer, GCHandleType.Pinned);
IntPtr pointer = handle.AddrOfPinnedObject ();
unsafe {
while (offset < representation.Size && stream.HasSpaceAvailable ()) {
bytesRead = representation.GetBytes (pointer, offset, (uint)buffer.Length, out err);
stream.Write (buffer, bytesRead);
offset += bytesRead;
}
}
stream.Close ();
handle.Free ();
}
o.OnCompleted ();
}, token).RouteExceptions (o);
return disp;
});
}
