protected async Task <bool> RunFunctionIfOpenAsyncT_MT(Func <Task> funcAsync) { if (!_isOpen) { return(false); } try { await _isOpenSemaphore.WaitAsync(CancToken); //.ConfigureAwait(false); if (_isOpen && funcAsync != null) { await Task.Run(funcAsync, CancToken).ConfigureAwait(false); return(true); } } catch (OperationCanceledException) { } catch (Exception ex) { if (SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore)) { await Logger.AddAsync(GetType().Name + ex.ToString(), Logger.ForegroundLogFilename); } } finally { SemaphoreSlimSafeRelease.TryRelease(_isOpenSemaphore); } return(false); }
protected void SetPropertyLockingUpdatingDb <T>(ref T fldValue, T newValue, object locker, bool raise = true, bool onlyIfDifferent = true, [CallerMemberName] string propertyName = "") { bool isValueChanged = false; lock (locker) { T oldValue = fldValue; if (!newValue.Equals(oldValue) || !onlyIfDifferent) { fldValue = newValue; isValueChanged = true; } } // separate to avoid deadlocks if (!isValueChanged) { return; } if (raise) { RaisePropertyChanged_UI(propertyName); } Task db = RunFunctionIfOpenAsyncA_MT(async delegate { if (UpdateDbMustOverride() == false) { // string attributeName = '_' + propertyName[0].ToString().ToLower() + propertyName.Substring(1); // only works if naming conventions are respected // GetType().GetField(attributeName)?.SetValue(this, oldValue); // RaisePropertyChanged_UI(propertyName); await Logger.AddAsync(GetType().ToString() + "." + propertyName + " could not be set", Logger.ForegroundLogFilename).ConfigureAwait(false); } }); }
private async Task <bool> SetIsEnabledAsync(bool enable) { if (!_isOpen || IsEnabled == enable) { return(false); } try { await _isOpenSemaphore.WaitAsync().ConfigureAwait(false); if (_isOpen && IsEnabled != enable) { IsEnabledAllowed = enable; return(true); } } catch (Exception ex) { if (SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore)) { await Logger.AddAsync(GetType().Name + ex.ToString(), Logger.ForegroundLogFilename); } } finally { SemaphoreSlimSafeRelease.TryRelease(_isOpenSemaphore); } return(false); }
private async Task LogMessage(string message, LogBotEntryLevel level) { await Task.Factory.StartNew(() => { Logger.AddAsync( new LogBotEntry( message, level) , _uiDispatcher); }); }
// LOLLO NOTE important! The Mutex can work across AppDomains (ie across main app and background task) but only if you give it a name! // Also, if you declare initially owned true, the second thread trying to cross it will stay locked forever. So, declare it false. // All this is not well documented. public static async Task LoadAsync() { string errorMessage = string.Empty; try { await _suspensionSemaphore.WaitAsync().ConfigureAwait(false); if (_isLoaded) { return; } var file = await ApplicationData.Current.LocalCacheFolder.CreateFileAsync(SessionDataFilename, CreationCollisionOption.OpenIfExists).AsTask().ConfigureAwait(false); //string ssss = null; //this is useful when you debug and want to see the file as a string //using (IInputStream inStream = await file.OpenSequentialReadAsync()) //{ // using (StreamReader streamReader = new StreamReader(inStream.AsStreamForRead())) // { // ssss = streamReader.ReadToEnd(); // } //} using (IInputStream inStream = await file.OpenSequentialReadAsync().AsTask().ConfigureAwait(false)) { using (var iinStream = inStream.AsStreamForRead()) { DataContractSerializer serializer = new DataContractSerializer(typeof(PersistentData)); iinStream.Position = 0; PersistentData newPersistentData = (PersistentData)(serializer.ReadObject(iinStream)); await iinStream.FlushAsync().ConfigureAwait(false); PersistentData.GetInstanceWithProperties(newPersistentData); } } Debug.WriteLine("ended reading settings"); } catch (System.Xml.XmlException ex) { errorMessage = "could not restore the settings"; await Logger.AddAsync(ex.ToString(), Logger.FileErrorLogFilename); } catch (Exception ex) { errorMessage = "could not restore the settings"; await Logger.AddAsync(ex.ToString(), Logger.FileErrorLogFilename); } finally { PersistentData.GetInstance().LastMessage = errorMessage; IsLoaded = true; SemaphoreSlimSafeRelease.TryRelease(_suspensionSemaphore); } }
public async Task <bool> CloseAsync(object args = null) { if (!_isOpen) { return(await RunFunctionIfOpenAsyncA(delegate { IsEnabledAllowed = false; }).ConfigureAwait(false)); } lock (_ctsLocker) { _cts?.CancelSafe(true); } try { await _isOpenSemaphore.WaitAsync().ConfigureAwait(false); if (_isOpen) { lock (_ctsLocker) { _cts?.Dispose(); _cts = null; _cancToken = new CancellationToken(true); // CancellationToken is not nullable and not disposable } await UnregisterBackEventHandlersAsync(); IsEnabledAllowed = false; IsOpen = false; await CloseMayOverrideAsync(args).ConfigureAwait(false); return(true); } } catch (Exception ex) { if (SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore)) { await Logger.AddAsync(GetType().Name + ex.ToString(), Logger.ForegroundLogFilename); } } finally { lock (_isOpenSemaphoreLocker) { SemaphoreSlimSafeRelease.TryDispose(_isOpenSemaphore); _isOpenSemaphore = null; } } return(false); }
public async Task <bool> OpenAsync(object args = null) { if (_isOpen) { return(await RunFunctionIfOpenAsyncA(delegate { IsEnabledAllowed = true; }).ConfigureAwait(false)); } lock (_isOpenSemaphoreLocker) { if (!SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore)) { _isOpenSemaphore = new SemaphoreSlimSafeRelease(1, 1); } } try { await _isOpenSemaphore.WaitAsync().ConfigureAwait(false); if (!_isOpen) { lock (_ctsLocker) { _cts?.Dispose(); _cts = new SafeCancellationTokenSource(); _cancToken = _cts.Token; } await OpenMayOverrideAsync(args).ConfigureAwait(false); IsOpen = true; IsEnabledAllowed = true; await RegisterBackEventHandlersAsync().ConfigureAwait(false); //Logger.Add_TPL($"OpenableObservablePage.OpenAsync: {GetType().Name} is now open", Logger.AppEventsLogFilename, Logger.Severity.Info, false); return(true); } } catch (Exception ex) { if (SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore)) { await Logger.AddAsync(GetType().Name + ex.ToString(), Logger.ForegroundLogFilename); } } finally { SemaphoreSlimSafeRelease.TryRelease(_isOpenSemaphore); } return(false); }
public async Task <bool> OpenAsync(object args = null) { if (!_isOpen) { lock (_isOpenSemaphoreLocker) { if (!SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore)) { _isOpenSemaphore = new SemaphoreSlimSafeRelease(1, 1); } } try { await _isOpenSemaphore.WaitAsync().ConfigureAwait(false); if (!_isOpen) { lock (_ctsLocker) { _cts?.Dispose(); _cts = new SafeCancellationTokenSource(); _cancToken = _cts.Token; } await OpenMayOverrideAsync(args).ConfigureAwait(false); IsOpen = true; IsEnabledAllowed = true; return(true); } } catch (Exception ex) { if (SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore)) { await Logger.AddAsync(GetType().Name + ex.ToString(), Logger.ForegroundLogFilename); } } finally { SemaphoreSlimSafeRelease.TryRelease(_isOpenSemaphore); } } if (_isOpen) { await SetIsEnabledAsync(true).ConfigureAwait(false); } return(false); }
protected async Task <BoolWhenOpen> RunFunctionIfOpenThreeStateAsyncT(Func <Task> funcAsync) { if (!_isOpen) { return(BoolWhenOpen.ObjectClosed); } try { await _isOpenSemaphore.WaitAsync(CancToken); //.ConfigureAwait(false); if (_isOpen) { await funcAsync().ConfigureAwait(false); return(BoolWhenOpen.Yes); } } catch (OperationCanceledException) { return(BoolWhenOpen.ObjectClosed); } catch (Exception ex) { if (SemaphoreSlimSafeRelease.IsAlive(_isOpenSemaphore)) { await Logger.AddAsync(GetType().Name + ex.ToString(), Logger.ForegroundLogFilename); return(BoolWhenOpen.Error); } } finally { SemaphoreSlimSafeRelease.TryRelease(_isOpenSemaphore); } return(BoolWhenOpen.ObjectClosed); }
private async void OnUnhandledException(object sender, UnhandledExceptionEventArgs e) { // this does not always work when the device force-shuts the app await Logger.AddAsync("UnhandledException: " + e.Exception.ToString(), Logger.AppExceptionLogFilename); }
/// <summary> /// Invoked when Navigation to a certain page fails /// </summary> /// <param name="sender">The Frame which failed navigation</param> /// <param name="e">Details about the navigation failure</param> private async void OnNavigationFailed(object sender, NavigationFailedEventArgs e) { await Logger.AddAsync(e.Exception.ToString(), Logger.AppEventsLogFilename); throw new Exception("Failed to load Page " + e.SourcePageType.FullName); }