public MetadataHandler(SystemMediaTransportControls systemMediaTransportControls, ForegroundNotifier notifier, Func <TimeSpan> getPosition, Action <TimeSpan> reportNextEvent, CancellationToken cancellationToken)
{
if (null == systemMediaTransportControls)
{
throw new ArgumentNullException("systemMediaTransportControls");
}
if (null == notifier)
{
throw new ArgumentNullException("notifier");
}
if (null == getPosition)
{
throw new ArgumentNullException("getPosition");
}
if (null == reportNextEvent)
{
throw new ArgumentNullException("reportNextEvent");
}
_systemMediaTransportControls = systemMediaTransportControls;
_notifier = notifier;
_getPosition = getPosition;
_reportNextEvent = reportNextEvent;
_updateTask = new SignalTask(Update, cancellationToken);
_metadataSink = new ActionMetadataSink(_updateTask.Fire);
}
public MetadataHandler(SystemMediaTransportControls systemMediaTransportControls, ForegroundNotifier notifier, Func<TimeSpan> getPosition, Action<TimeSpan> reportNextEvent, CancellationToken cancellationToken)
{
if (null == systemMediaTransportControls)
throw new ArgumentNullException(nameof(systemMediaTransportControls));
if (null == notifier)
throw new ArgumentNullException(nameof(notifier));
if (null == getPosition)
throw new ArgumentNullException(nameof(getPosition));
if (null == reportNextEvent)
throw new ArgumentNullException(nameof(reportNextEvent));
_systemMediaTransportControls = systemMediaTransportControls;
_notifier = notifier;
_getPosition = getPosition;
_reportNextEvent = reportNextEvent;
_updateTask = new SignalTask(Update, cancellationToken);
_metadataSink = new ActionMetadataSink(_updateTask.Fire);
}
public BackgroundAudioRun(Guid id)
{
_id = id;
_foregroundNotifier = new ForegroundNotifier(id);
_timer = new Timer(_ =>
{
var metadataHandler = _metadataHandler;
if (null == metadataHandler)
{
return;
}
metadataHandler.Refresh();
}, null, Timeout.InfiniteTimeSpan, Timeout.InfiniteTimeSpan);
_notificationQueue = new ValueSetWorkerQueue(vs =>
{
HandleNotification(vs);
return(TplTaskExtensions.CompletedTask);
});
_watchdogTimer = new Timer(
_ =>
{
Debug.WriteLine("BackgroundAudioRun watchdog");
var barks = 1;
try
{
var foregroundId = BackgroundSettings.ForegroundId;
if (!foregroundId.HasValue || _completionSource.Task.IsCompleted)
{
Interlocked.Exchange(ref _watchdogBarks, 0);
StopWatchdog();
return;
}
barks = Interlocked.Increment(ref _watchdogBarks);
if (barks > 3)
{
Debug.WriteLine("BackgroundAudioRun watchdog exiting");
_completionSource.TrySetCanceled();
Cancel();
return;
}
_foregroundNotifier.Notify(BackgroundNotificationType.Ping);
}
catch (Exception ex)
{
Debug.WriteLine("BackgroundAudioRun watchdog failed: " + ex.ExtendedMessage());
}
RequestWatchdog(TimeSpan.FromTicks(WatchdogTimeout.Ticks >> barks));
},
null, Timeout.InfiniteTimeSpan, Timeout.InfiniteTimeSpan);
}
public BackgroundAudioRun(Guid id)
{
_id = id;
_foregroundNotifier = new ForegroundNotifier(id);
_timer = new Timer(_ =>
{
var metadataHandler = _metadataHandler;
if (null == metadataHandler)
return;
metadataHandler.Refresh();
}, null, Timeout.InfiniteTimeSpan, Timeout.InfiniteTimeSpan);
_notificationQueue = new ValueSetWorkerQueue(vs =>
{
HandleNotification(vs);
return TplTaskExtensions.CompletedTask;
});
_watchdogTimer = new Timer(
_ =>
{
Debug.WriteLine("BackgroundAudioRun watchdog");
var barks = 1;
try
{
var foregroundId = BackgroundSettings.ForegroundId;
if (!foregroundId.HasValue || _completionSource.Task.IsCompleted)
{
Interlocked.Exchange(ref _watchdogBarks, 0);
StopWatchdog();
return;
}
barks = Interlocked.Increment(ref _watchdogBarks);
if (barks > 3)
{
Debug.WriteLine("BackgroundAudioRun watchdog exiting");
_completionSource.TrySetCanceled();
Cancel();
return;
}
_foregroundNotifier.Notify(BackgroundNotificationType.Ping);
}
catch (Exception ex)
{
Debug.WriteLine("BackgroundAudioRun watchdog failed: " + ex.ExtendedMessage());
}
RequestWatchdog(TimeSpan.FromTicks(WatchdogTimeout.Ticks >> barks));
},
null, Timeout.InfiniteTimeSpan, Timeout.InfiniteTimeSpan);
}