public static Task DelayedAsync(TimeSpan delay, Func <Task> action, CancellationToken cancellationToken = default)
{
if (cancellationToken.IsCancellationRequested)
{
return(Task.CompletedTask);
}
return(Task.Run(async() => {
if (delay.Ticks > 0)
{
await SystemClock.SleepAsync(delay, cancellationToken).AnyContext();
}
if (cancellationToken.IsCancellationRequested)
{
return;
}
await action().AnyContext();
}, cancellationToken));
}
private async Task RunCallbackAsync()
{
bool isTraceLogLevelEnabled = _logger.IsEnabled(LogLevel.Trace);
if (_isRunning)
{
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Exiting run callback because its already running, will run again immediately.");
}
_shouldRunAgainImmediately = true;
return;
}
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Starting RunCallbackAsync");
}
using (await _lock.LockAsync().AnyContext()) {
if (_isRunning)
{
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Exiting run callback because its already running, will run again immediately.");
}
_shouldRunAgainImmediately = true;
return;
}
_last = SystemClock.UtcNow;
}
try {
_isRunning = true;
DateTime?next = null;
try {
next = await _timerCallback().AnyContext();
} catch (Exception ex) {
if (_logger.IsEnabled(LogLevel.Error))
{
_logger.LogError(ex, "Error running scheduled timer callback: {Message}", ex.Message);
}
_shouldRunAgainImmediately = true;
}
if (_minimumInterval > TimeSpan.Zero)
{
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Sleeping for minimum interval: {Interval}", _minimumInterval);
}
await SystemClock.SleepAsync(_minimumInterval).AnyContext();
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Finished sleeping");
}
}
var nextRun = SystemClock.UtcNow.AddMilliseconds(10);
if (_shouldRunAgainImmediately || next.HasValue && next.Value <= nextRun)
{
ScheduleNext(nextRun);
}
else if (next.HasValue)
{
ScheduleNext(next.Value);
}
} catch (Exception ex) {
if (_logger.IsEnabled(LogLevel.Error))
{
_logger.LogError(ex, "Error running schedule next callback: {Message}", ex.Message);
}
} finally {
_isRunning = false;
_shouldRunAgainImmediately = false;
}
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Finished RunCallbackAsync");
}
}
private async Task RunCallbackAsync()
{
bool isTraceLogLevelEnabled = _logger.IsEnabled(0);
if (_isRunning)
{
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Exiting run callback because its already running, will run again immediately.", Array.Empty <object>());
}
_shouldRunAgainImmediately = true;
}
else
{
if (isTraceLogLevelEnabled)
{
LoggerExtensions.LogTrace(_logger, "Starting RunCallbackAsync", Array.Empty <object>());
}
using (await _lock.LockAsync().AnyContext())
{
if (_isRunning)
{
if (isTraceLogLevelEnabled)
{
_logger.LogTrace("Exiting run callback because its already running, will run again immediately.", Array.Empty <object>());
}
_shouldRunAgainImmediately = true;
return;
}
_last = SystemClock.UtcNow;
}
try
{
_isRunning = true;
DateTime? next = null;
Stopwatch sw = Stopwatch.StartNew();
try
{
next = await _timerCallback().AnyContext();
}
catch (Exception ex)
{
if (_logger.IsEnabled(LogLevel.Error))
{
LoggerExtensions.LogError(_logger, ex, "Error running scheduled timer callback: {Message}", new object[1]
{
ex.Message
});
}
_shouldRunAgainImmediately = true;
}
finally
{
sw.Stop();
if (isTraceLogLevelEnabled)
{
LoggerExtensions.LogTrace(_logger, "Callback took: {Elapsed:g}", new object[1]
{
sw.Elapsed
});
}
}
if (_minimumInterval > TimeSpan.Zero)
{
if (isTraceLogLevelEnabled)
{
LoggerExtensions.LogTrace(_logger, "Sleeping for minimum interval: {Interval:g}", new object[1]
{
_minimumInterval
});
}
await SystemClock.SleepAsync(_minimumInterval, default(CancellationToken)).AnyContext();
if (isTraceLogLevelEnabled)
{
LoggerExtensions.LogTrace(_logger, "Finished sleeping", Array.Empty <object>());
}
}
DateTime dateTime = SystemClock.UtcNow.AddMilliseconds(10.0);
if (_shouldRunAgainImmediately || (next.HasValue && next.Value <= dateTime))
{
ScheduleNext(dateTime);
}
else if (next.HasValue)
{
ScheduleNext(next.Value);
}
}
catch (Exception ex2)
{
if (_logger.IsEnabled(LogLevel.Error))
{
LoggerExtensions.LogError(_logger, ex2, "Error running schedule next callback: {Message}", new object[1]
{
ex2.Message
});
}
}
finally
{
_isRunning = false;
_shouldRunAgainImmediately = false;
}
if (isTraceLogLevelEnabled)
{
LoggerExtensions.LogTrace(_logger, "Finished RunCallbackAsync", Array.Empty <object>());
}
}
}