public Task<bool> RecordAsync(StorageFile file, CancellationToken cancToken)
{
return RunFunctionIfOpenAsyncTB(async delegate
{
if (file == null) return false;
bool isOk = await StartRecordingAsync(file).ConfigureAwait(false);
// Lock the thread asynchronously until explicitly closed from the caller.
// If an error prevented starting recording, stay open to display error messages.
// The lock will last until the cancellation token is cancelled or the semaphore is released or disposed.
_recordLockingSemaphore = new SemaphoreSlimSafeRelease(0, 1); // this semaphore is always closed at the beginning
try
{
await _recordLockingSemaphore.WaitAsync(cancToken).ConfigureAwait(false);
Debug.WriteLine("I am past _triggerSemaphore");
}
catch (OperationCanceledException)
{
isOk = false;
Debug.WriteLine("I am past _triggerSemaphore after OperationCanceledException");
}
catch (Exception ex)
{
Debug.WriteLine("I am past _triggerSemaphore after exception: " + ex.ToString());
if (SemaphoreSlimSafeRelease.IsAlive(_recordLockingSemaphore))
{
isOk = false;
Logger.Add_TPL(ex.ToString(), Logger.ForegroundLogFilename);
}
}
return isOk;
});
}
public static async Task <string> ReadAsync(string fileName)
{
string result = string.Empty;
try
{
await _semaphore.WaitAsync().ConfigureAwait(false);
result = await Read2Async(fileName).ConfigureAwait(false);
}
catch (FileNotFoundException exc0)
{
//put up with it: it may be the first time we use this file
Debug.WriteLine("no worries but: " + exc0.ToString());
}
catch (Exception exc)
{
if (SemaphoreSlimSafeRelease.IsAlive(_semaphore))
{
Debug.WriteLine("ERROR in Logger.ReadAsync(): " + exc.ToString());
}
}
finally
{
SemaphoreSlimSafeRelease.TryRelease(_semaphore);
}
return(result);
}
public static bool TryRelease(SemaphoreSlimSafeRelease semaphore, int releaseCount)
{
try
{
if (IsAlive(semaphore))
{
semaphore.Release(releaseCount);
return true;
}
}
catch { }
return false;
}
public static bool TryRelease(SemaphoreSlimSafeRelease semaphore, int releaseCount)
{
try
{
if (IsAlive(semaphore))
{
semaphore.Release(releaseCount);
return(true);
}
}
catch { }
return(false);
}
/// <summary>
/// Disposes of a semaphore.
/// You can use this method to interrupt all operations, which are queuing at the semaphore, if you initialised it for max 1 thread.
/// Wait at the semaphore before calling this method, to be sure you don't disrupt any running operations at an unexpected moment.
/// Every method using this semaphore should make allowance for it being disposed.
/// </summary>
/// <example>
/// Use it as follows:
/// <code>
/// try
/// {
/// semaphore.Wait();
/// do some work
/// }
/// catch (Exception ex)
/// {
/// if (SemaphoreSlimSafeRelease.IsAlive(semaphore))
/// // you have a real error, otherwise it's simply the semaphore being disposed and reset to null
/// }
/// finally
/// {
/// SemaphoreSlimSafeRelease.TryRelease(semaphore);
/// // do not just call semaphore.Release() because the semaphore may be disposed or null at this stage
/// }
/// </code>
/// </example>
/// <param name="semaphore"></param>
/// <returns></returns>
public static bool TryDispose(SemaphoreSlimSafeRelease semaphore)
{
try
{
if (IsAlive(semaphore))
{
semaphore.Dispose();
return(true);
}
}
catch { }
return(false);
}
public static bool TryRelease(SemaphoreSlimSafeRelease semaphore)
{
try
{
// the following commented out stuff wouldbe nice to avoid the exception but it is not atomic, so we leave it.
if (IsAlive(semaphore) /*&& semaphore.CurrentCount < semaphore._maxCount*/)
{
semaphore.Release();
return true;
}
}
catch { }
return false;
}
public static bool TryRelease(SemaphoreSlimSafeRelease semaphore)
{
try
{
// the following commented out stuff wouldbe nice to avoid the exception but it is not atomic, so we leave it.
if (IsAlive(semaphore) /*&& semaphore.CurrentCount < semaphore._maxCount*/)
{
semaphore.Release();
return(true);
}
}
catch { }
return(false);
}
public static void ClearAll()
{
Task.Run(async delegate
{
try
{
await _semaphore.WaitAsync().ConfigureAwait(false);
//await _logsFolder.DeleteAsync().AsTask().ConfigureAwait(false);
_logsFolder = await ApplicationData.Current.LocalCacheFolder.CreateFolderAsync(LogFolderName, CreationCollisionOption.ReplaceExisting).AsTask().ConfigureAwait(false);
}
catch (Exception exc)
{
if (SemaphoreSlimSafeRelease.IsAlive(_semaphore))
{
Debug.WriteLine("ERROR in Logger.ClearAll(): " + exc.ToString());
}
}
finally
{
SemaphoreSlimSafeRelease.TryRelease(_semaphore);
}
});
}
private static async Task Add2Async(string msg, string fileName)
{
try
{
await _semaphore.WaitAsync().ConfigureAwait(false);
await UpdateLogAsync(fileName, msg).ConfigureAwait(false);
//Debug.WriteLine("the thread id is " + Environment.CurrentManagedThreadId + " after the await");
}
catch (Exception exc)
{
if (SemaphoreSlimSafeRelease.IsAlive(_semaphore))
{
Debug.WriteLine("ERROR in Logger: " + exc.ToString());
}
}
finally
{
SemaphoreSlimSafeRelease.TryRelease(_semaphore);
}
// await SendEmailWithLogsAsync("*****@*****.**"); // maybe move Logger into the utils and use the right email address and maybe new parameter "sendemailifcrash"
// On second thought, the email could be annoying and scary. Better leave the option to send it in the "About" panel only.
}
/// <summary>
/// Disposes of a semaphore.
/// You can use this method to interrupt all operations, which are queuing at the semaphore, if you initialised it for max 1 thread.
/// Wait at the semaphore before calling this method, to be sure you don't disrupt any running operations at an unexpected moment.
/// Every method using this semaphore should make allowance for it being disposed.
/// </summary>
/// <example>
/// Use it as follows:
/// <code>
/// try
/// {
/// semaphore.Wait();
/// do some work
/// }
/// catch (Exception ex)
/// {
/// if (SemaphoreSlimSafeRelease.IsAlive(semaphore))
/// // you have a real error, otherwise it's simply the semaphore being disposed and reset to null
/// }
/// finally
/// {
/// SemaphoreSlimSafeRelease.TryRelease(semaphore);
/// // do not just call semaphore.Release() because the semaphore may be disposed or null at this stage
/// }
/// </code>
/// </example>
/// <param name="semaphore"></param>
/// <returns></returns>
public static bool TryDispose(SemaphoreSlimSafeRelease semaphore)
{
try
{
if (IsAlive(semaphore))
{
semaphore.Dispose();
return true;
}
}
catch { }
return false;
}
/// <summary>
/// Returns true if a SemaphoreSlimSafeRelease is not null and not disposed.
/// </summary>
/// <param name="semaphore"></param>
/// <returns></returns>
public static bool IsAlive(SemaphoreSlimSafeRelease semaphore)
{
return semaphore != null && !semaphore._isDisposed;
}
public DocumentView()
{
_appView = ApplicationView.GetForCurrentView(); _appView.VisibleBoundsChanged += OnVisibleBoundsChanged;
_renderSemaphore = new SemaphoreSlimSafeRelease(1, 1);
Loaded += OnLoaded;
Unloaded += OnUnloaded;
InitializeComponent();
}
public Task<bool> RecordAsync(StorageFile file, CancellationToken cancToken)
{
return RunFunctionIfOpenAsyncTB(async delegate
{
_file = file;
await SetupUiAsync();
bool isOk = await InitializeCameraAsync().ConfigureAwait(false);
if (isOk)
{
_triggerSemaphore = new SemaphoreSlimSafeRelease(0, 1); // this semaphore is always closed at the beginning
try
{
await _triggerSemaphore.WaitAsync(cancToken).ConfigureAwait(false);
}
catch (OperationCanceledException)
{ }
catch (Exception ex)
{
if (SemaphoreSlimSafeRelease.IsAlive(_triggerSemaphore))
{
Logger.Add_TPL(ex.ToString(), Logger.ForegroundLogFilename);
}
}
}
//else
//{
// Task beginFailureAnim = RunInUiThreadAsync(delegate { FailureStoryboard.Begin(); });
//}
return isOk;
});
}
/// <summary>
/// I need this override to stop any running media recording
/// </summary>
/// <returns></returns>
//public override async Task<bool> CloseAsync() // LOLLO fix this like in AudioRecorderView if you want to use this class
//{
// if (!_isOpen) return false;
// SemaphoreSlimSafeRelease.TryRelease(_triggerSemaphore);
// return await base.CloseAsync().ConfigureAwait(false);
//}
protected override async Task CloseMayOverrideAsync()
{
await Stop2Async().ConfigureAwait(false);
SemaphoreSlimSafeRelease.TryDispose(_triggerSemaphore);
_triggerSemaphore = null;
}
/// <summary>
/// Returns true if a SemaphoreSlimSafeRelease is not null and not disposed.
/// </summary>
/// <param name="semaphore"></param>
/// <returns></returns>
public static bool IsAlive(SemaphoreSlimSafeRelease semaphore)
{
return(semaphore != null && !semaphore._isDisposed);
}
protected override async Task CloseMayOverrideAsync()
{
await StopRecordingAsync().ConfigureAwait(false);
SemaphoreSlimSafeRelease.TryDispose(_recordLockingSemaphore);
_recordLockingSemaphore = null;
var mc = _mediaCapture;
if (mc != null)
{
mc.Failed -= OnMediaCapture_Failed;
try
{
mc.Dispose();
}
catch { }
}
_mediaCapture = null;
var audioRecorder = _audioRecorder;
if (audioRecorder != null)
{
audioRecorder.UnrecoverableError -= OnAudioRecorder_UnrecoverableError;
await audioRecorder.CloseAsync();
}
_audioRecorder = null;
Task stopAllAnims = RunInUiThreadAsync(delegate
{
RecordingStoryboard.SkipToFill();
RecordingStoryboard.Stop();
FailureStoryboard.SkipToFill();
FailureStoryboard.Stop();
});
}
