async Task RunAsync(IBackgroundTaskInstance taskInstance)
{
BackgroundTaskDeferral deferral = null;
BackgroundAudioRun run = null;
MemoryDiagnostics.DumpMemory();
var usage = MemoryManager.AppMemoryUsage;
var limit = MemoryManager.AppMemoryUsageLimit;
if (usage + RequiredMemory > limit)
{
Debug.WriteLine("*** SmMediaBackgroundAudioTask.RunAsync() low memory");
// We can't play anything because there isn't enough memory. Force
// the process to restart.
try
{
Application.Current.Exit();
}
catch (Exception ex)
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() exit failed " + ex.ExtendedMessage());
}
// Exit() didn't help, so we hog as much as we can of the remaining memory.
MemoryHog.ConsumeAllMemory();
BackgroundMediaPlayer.Shutdown();
return;
}
var deferralId = Guid.NewGuid();
try
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() getting deferral " + deferralId);
deferral = taskInstance.GetDeferral();
try
{
#if DEBUG
_memoryDiagnostics.StartPoll();
#endif
run = new BackgroundAudioRun(taskInstance.InstanceId);
var oldRun = Interlocked.Exchange(ref _run, run);
if (null != oldRun)
{
Debug.WriteLine("SmMediaBackgroundAudioTask.Run() run already exists");
oldRun.Dispose();
}
taskInstance.Canceled += run.OnCanceled;
taskInstance.Task.Completed += run.OnTaskCompleted;
await run.ExecuteAsync().ConfigureAwait(false);
}
catch (Exception ex)
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() failed " + ex.ExtendedMessage());
}
try
{
#if DEBUG
_memoryDiagnostics.StopPoll();
#endif
var currentRun = Interlocked.CompareExchange(ref _run, null, run);
if (!ReferenceEquals(currentRun, run))
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() mismatching run");
if (null != run)
{
taskInstance.Canceled -= run.OnCanceled;
taskInstance.Task.Completed -= run.OnTaskCompleted;
}
if (null != run)
run.Dispose();
}
catch (Exception ex)
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() cleanup failed: " + ex.ExtendedMessage());
}
}
finally
{
if (null != deferral)
{
deferral.Complete();
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() released deferral " + deferralId);
}
}
}
async Task RunAsync(IBackgroundTaskInstance taskInstance)
{
BackgroundTaskDeferral deferral = null;
BackgroundAudioRun run = null;
MemoryDiagnostics.DumpMemory();
var usage = MemoryManager.AppMemoryUsage;
var limit = MemoryManager.AppMemoryUsageLimit;
if (usage + RequiredMemory > limit)
{
Debug.WriteLine("*** SmMediaBackgroundAudioTask.RunAsync() low memory");
// We can't play anything because there isn't enough memory. Force
// the process to restart.
try
{
Application.Current.Exit();
}
catch (Exception ex)
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() exit failed " + ex.ExtendedMessage());
}
// Exit() didn't help, so we hog as much as we can of the remaining memory.
MemoryHog.ConsumeAllMemory();
BackgroundMediaPlayer.Shutdown();
return;
}
var deferralId = Guid.NewGuid();
try
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() getting deferral " + deferralId);
deferral = taskInstance.GetDeferral();
try
{
#if DEBUG
_memoryDiagnostics.StartPoll();
#endif
run = new BackgroundAudioRun(taskInstance.InstanceId);
var oldRun = Interlocked.Exchange(ref _run, run);
if (null != oldRun)
{
Debug.WriteLine("SmMediaBackgroundAudioTask.Run() run already exists");
oldRun.Dispose();
}
taskInstance.Canceled += run.OnCanceled;
taskInstance.Task.Completed += run.OnTaskCompleted;
await run.ExecuteAsync().ConfigureAwait(false);
}
catch (Exception ex)
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() failed " + ex.ExtendedMessage());
}
try
{
#if DEBUG
_memoryDiagnostics.StopPoll();
#endif
var currentRun = Interlocked.CompareExchange(ref _run, null, run);
if (!ReferenceEquals(currentRun, run))
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() mismatching run");
}
if (null != run)
{
taskInstance.Canceled -= run.OnCanceled;
taskInstance.Task.Completed -= run.OnTaskCompleted;
}
if (null != run)
{
run.Dispose();
}
}
catch (Exception ex)
{
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() cleanup failed: " + ex.ExtendedMessage());
}
}
finally
{
if (null != deferral)
{
deferral.Complete();
Debug.WriteLine("SmMediaBackgroundAudioTask.RunAsync() released deferral " + deferralId);
}
}
}
