/// <summary>
/// Starts the timer.
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
private void Start(CancellationToken cancellationToken)
{
if (Interval <= 0)
{
// Never start a timer
return;
}
if (cancellationToken.IsCancellationRequested)
{
return;
}
#if USE_INTERNAL_TIMER
lock (_lock)
{
if (_timer != null)
{
_timer.Change(Interval, Timeout.Infinite);
}
}
#else
var delayTask = TaskShim.Delay(Interval, cancellationToken);
delayTask.ContinueWith(ContinueTimer, cancellationToken, cancellationToken);
#endif
}
/// <summary>
/// Changes the specified interval.
/// </summary>
/// <param name="dueTime">The due time.</param>
/// <param name="interval">The interval.</param>
public void Change(TimeSpan dueTime, TimeSpan interval)
{
SetUpTimer(dueTime, interval);
var cancellationToken = _cancellationTokenSource.Token;
if (dueTime < TimeSpan.Zero)
{
// Never invoke initial one
}
else if (dueTime == TimeSpan.Zero)
{
// Invoke immediately
TimerElapsed();
Start(cancellationToken);
}
else
{
// Invoke after due time
#if USE_INTERNAL_TIMER
lock (_lock)
{
if (_timer != null)
{
_timer.Change(dueTime, Timeout.InfiniteTimeSpan);
}
}
#else
var delayTask = TaskShim.Delay(dueTime, cancellationToken);
delayTask.ContinueWith(ContinueTimer, cancellationToken, cancellationToken);
#endif
}
}
/// <summary>
/// Creates a <see cref="Task"/> using the <c>Task.FromResult</c> method, but caches the result for the next call.
/// </summary>
/// <param name="value">The value.</param>
/// <returns>Task<T>.</returns>
public static Task <T> FromResult(T value)
{
lock (_fromResultCache)
{
if (!_fromResultCache.TryGetValue(value, out var task))
{
task = TaskShim.FromResult(value);
_fromResultCache[value] = task;
}
return(task);
}
}
/// <summary>
/// Creates a <see cref="Task"/> using the <c>Task.FromResult</c> method, but caches the result for the next call.
/// </summary>
/// <param name="value">The value.</param>
/// <returns>Task<T>.</returns>
public static Task <T> FromResult(T value)
{
Task <T> task;
if (!_fromResultCache.ContainsKey(value))
{
task = TaskShim.FromResult(value);
_fromResultCache[value] = task;
}
else
{
task = _fromResultCache[value];
}
return(task);
}
/// <summary>
/// Changes the specified interval.
/// </summary>
/// <param name="dueTime">The due time.</param>
/// <param name="interval">The interval.</param>
public void Change(TimeSpan dueTime, TimeSpan interval)
{
SetUpTimer(dueTime, interval);
var cancellationToken = GetCancellationToken();
if (dueTime < TimeSpan.Zero)
{
// Never invoke initial one
}
else if (dueTime == TimeSpan.Zero)
{
// Invoke immediately
TimerElapsed();
Start(cancellationToken);
}
else
{
// Invoke after due time
#if USE_INTERNAL_TIMER
lock (_lock)
{
if (_timer != null)
{
_timer.Change(dueTime, Timeout.InfiniteTimeSpan);
}
}
#else
var delayTask = TaskShim.Delay(dueTime, cancellationToken);
delayTask.ContinueWith(ContinueTimer, cancellationToken, cancellationToken);
#endif
}
// Note: don't use SafeInvoke, this event could be raised a *lot*
var changed = Changed;
if (changed != null)
{
changed(this, EventArgs.Empty);
}
}
/// <summary>
/// Creates a new async-compatible mutual exclusion lock using the specified wait queue.
/// </summary>
/// <param name="queue">The wait queue used to manage waiters.</param>
public AsyncLock(IAsyncWaitQueue <IDisposable> queue)
{
_queue = queue;
_cachedKeyTask = TaskShim.FromResult <IDisposable>(new Key(this));
_mutex = new object();
}