internal Task <T> Send <T>(DispatchPriority priority, Func <T> operation)
{
var task = new Task <T>(operation);
Post(priority, () => task.RunSynchronously());
return(task);
}
public void Enqueue(DispatchPriority priority, Action operation)
{
lock (_lock)
{
_queuedOperations[(int)priority].Enqueue(operation);
}
}
internal Task Send(DispatchPriority priority, Action operation)
{
var task = new Task(operation);
Post(priority, () => task.RunSynchronously());
return(task);
}
/// <summary>
/// Adds the <paramref name="operation"/> to the operation queue and stops the current thread until it's executed.
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
/// <returns>Result value of the performed operation</returns>
/// <remarks>If called from within an operation currently executed by the <see cref="Current"/>, the provided <paramref name="operation"/> will be performed in place to avoid deadlocks.</remarks>
public T Invoke <T>(DispatchPriority priority, Func <T> operation)
{
if (CheckAccess())
{
return(operation());
}
else
{
return(InvokeAsync(priority, operation).Result);
}
}
/// <summary>
/// Adds the <paramref name="operation"/> to the operation queue and stops the current thread until it's executed.
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
/// <remarks>If called from within an operation currently executed by the <see cref="Current"/>, the provided <paramref name="operation"/> will be performed in place to avoid deadlocks.</remarks>
public void Invoke(DispatchPriority priority, Action operation)
{
if (CheckAccess())
{
operation();
}
else
{
_synchronizationContext.Send(priority, operation);
}
}
/// <summary>
/// If called for another thread, works similarly to the <seealso cref="Dispatch(DispatchPriority, Func{Task})"/>, but if called from the <see cref="Current"/> thread - executes the <paramref name="operation"/> inline.
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
public void Run(DispatchPriority priority, Func <Task> operation)
{
if (CheckAccess())
{
operation();
}
else
{
Dispatch(priority, operation);
}
}
public int Count(DispatchPriority minPriority)
{
int count = 0;
lock (_lock)
{
for (var priority = DispatchPriority.High; priority >= minPriority; --priority)
{
count += _queuedOperations[(int)priority].Count;
}
}
return(count);
}
internal static void BeginInvoke(this FrameworkElement fe, Action action, DispatchPriority dispatcherPriority)
{
if (fe == null)
{
throw new ArgumentNullException("fe");
}
var dispatcherInstance = fe.Dispatcher;
if (dispatcherInstance == null)
{
action();
return;
}
#if !SILVERLIGHT
dispatcherInstance.BeginInvoke((DispatcherPriority)dispatcherPriority, action);
#else
dispatcherInstance.BeginInvoke(action);
#endif
}
private void Dispatch(DispatchPriority priority, Action action) => _dispatcher.Dispatch(priority, action);
internal void Post(DispatchPriority priority, Action operation)
{
_operationQueue.Enqueue(priority, operation);
_waitToken?.Cancel();
}
public bool Any(DispatchPriority minPriority)
{
return(Count(minPriority) > 0);
}
private void AssertNone(DispatchPriority minPriority = DispatchPriority.Low)
{
Assert.IsFalse(_queue.Any(minPriority));
}
/// <summary>
/// Adds the <paramref name="operation"/> to the operation queue and returns a <see cref="Task"/> associated with the state of its execution.
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
public Task InvokeAsync(DispatchPriority priority, Action operation)
{
return(_synchronizationContext.Send(priority, operation));
}
private void AssertCount(int count, DispatchPriority minPriority = DispatchPriority.Low)
{
Assert.AreEqual(count, _queue.Count(minPriority));
}
private void AssertAny(DispatchPriority minPriority = DispatchPriority.Low)
{
Assert.IsTrue(_queue.Any(minPriority));
}
/// <summary>
/// Adds the asynchronous <paramref name="operation"/> to the operation queue and returns a <see cref="Task"/> associated with the state of its execution.
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
public async Task InvokeAsync(DispatchPriority priority, Func <Task> operation)
{
await await InvokeAsync <Task>(priority, operation);
}
private void Enqueue(DispatchPriority priority, int value = 0)
{
_queue.Enqueue(priority, () => _dequeuedValue = value);
}
private void Invoke(DispatchPriority priority, Action action) => _dispatcher.Invoke(priority, action);
private void Enqueue(TimeSpan timeSpan, DispatchPriority priority, Action action)
{
_queue.Enqueue(_now.Add(timeSpan), priority, action);
}
private void Dispatch(DispatchPriority priority, Func <Task> action) => _dispatcher.Dispatch(priority, action);
/// <summary>
/// Adds the asynchronous <paramref name="operation"/> to the operation queue without blocking of the current thread (fire and forget).
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
public void Dispatch(DispatchPriority priority, Func <Task> operation)
{
_synchronizationContext.Post(priority, () => operation());
}
/// <summary>
/// Adds the <paramref name="operation"/> to the operation queue without blocking of the current thread (fire and forget).
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
public void Dispatch(DispatchPriority priority, Action operation)
{
_synchronizationContext.Post(priority, operation);
}
/// <summary>
/// Adds the asynchronous <paramref name="operation"/> to the operation queue and returns a <see cref="Task"/> associated with the state of its execution.
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
public async Task <T> InvokeAsync <T>(DispatchPriority priority, Func <Task <T> > operation)
{
return(await await InvokeAsync <Task <T> >(priority, operation));
}
/// <summary>
/// Adds the <paramref name="operation"/> to the operation queue and returns a <see cref="Task"/> associated with the state of its execution.
/// </summary>
/// <param name="priority">Priority of the operation</param>
/// <param name="operation">Operation to be queued</param>
public Task <T> InvokeAsync <T>(DispatchPriority priority, Func <T> operation)
{
return(_synchronizationContext.Send(priority, operation));
}
private void Schedule(TimeSpan timeSpan, DispatchPriority priority, Action action) => _dispatcher.Schedule(timeSpan, priority, action);
/// <summary>
/// Schedules the execution of the <paramref name="operation"/> after the provided <paramref name="delay"/>.
/// </summary>
/// <param name="delay"></param>
/// <param name="operation">Operation to be scheduled</param>
/// <remarks>
/// It is not guaranteed that the <paramref name="operation"/> will be executed exactly after the provided <paramref name="delay"/> (it's only guaranteed that it will be queued not sooner then that).
/// </remarks>
public void Schedule(TimeSpan delay, DispatchPriority priority, Action operation)
{
_synchronizationContext.PostDelayed(DateTime.UtcNow + delay, priority, operation);
}
private T Invoke <T>(DispatchPriority priority, Func <T> func) => _dispatcher.Invoke(priority, func);
/// <summary>
/// Schedules the execution of the <paramref name="operation"/> after the provided <paramref name="delay"/>.
/// </summary>
/// <param name="delay"></param>
/// <param name="operation">Operation to be scheduled</param>
/// <remarks>
/// It is not guaranteed that the <paramref name="operation"/> will be executed exactly after the provided <paramref name="delay"/> (it's only guaranteed that it will be queued not sooner then that).
/// </remarks>
public void Schedule(TimeSpan delay, DispatchPriority priority, Func <Task> operation)
{
_synchronizationContext.PostDelayed(DateTime.UtcNow + delay, priority, () => operation());
}
private void Enqueue(TimeSpan timeSpan, DispatchPriority priority, int value = 0)
{
_queue.Enqueue(_now.Add(timeSpan), priority, () => _dequeuedValues.Add(value));
}
/// <summary>
/// When awaited, will yield the execution of the current dispatcher to other queued operations with at least given <paramref name="priority"/>.
/// </summary>
/// <param name="priority">The priority of operations to be executed</param>
/// <exception cref="DispatcherException">Throws the <see cref="DispatcherException"/> if no dispatcher is currently running on the calling thread.</exception>
public static YieldTask Yield(DispatchPriority priority = DispatchPriority.Low)
{
return(new YieldTask(priority));
}