public MediaPlayerHandle(CoreDispatcher dispatcher)
{
BackgroundSettings.RemoveForegroundId();
_dispatcher = dispatcher;
_notifier = new BackgroundNotifier(_id);
_subscriptionHandle = new BackgroundSubscriptionHandle(OnMessageReceivedFromBackground);
_notificationQueue = new ValueSetWorkerQueue(HandleNotification);
BackgroundSettings.SetForegroundId(_id);
}
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);
}