private void PublishEvent(EventArgs eventArgs)
{
EventFns.Publish(new EntityManagerEventMessage <T>(Manager, eventArgs));
var entityChangedEventArgs = eventArgs as EntityChangedEventArgs;
if (entityChangedEventArgs != null)
{
EntityChanged(Manager, entityChangedEventArgs);
}
var entityQueryingEventArgs = eventArgs as EntityQueryingEventArgs;
if (entityQueryingEventArgs != null)
{
Querying(Manager, entityQueryingEventArgs);
}
var entitySavingEventArgs = eventArgs as EntitySavingEventArgs;
if (entitySavingEventArgs != null)
{
Saving(Manager, entitySavingEventArgs);
}
var entitySavedEventArgs = eventArgs as EntitySavedEventArgs;
if (entitySavedEventArgs != null)
{
Saved(Manager, entitySavedEventArgs);
}
}
private T CreateEntityManagerCore()
{
var compositionProvider = Composition.Provider as ISupportsRecomposition;
if (compositionProvider != null && compositionProvider.IsRecomposing)
{
throw new InvalidOperationException(StringResources.CreatingEntityManagerDuringRecompositionNotAllowed);
}
Composition.BuildUp(this);
EventFns.Subscribe(this);
EnsureDelegates();
var manager = CreateEntityManager();
if (ConnectionOptions.IsDesignTime)
{
manager.Fetching +=
delegate { throw new InvalidOperationException(StringResources.ManagerTriedToFetchData); };
manager.Saving +=
delegate { throw new InvalidOperationException(StringResources.ManagerTriedToSaveData); };
if (SampleDataProviders != null)
{
SampleDataProviders.ForEach(p => p.AddSampleData(manager));
}
}
return(manager);
}
/// <summary>
/// Raises the <see cref="Completed" /> event.
/// </summary>
protected void OnComplete()
{
if (Completed == null)
{
return;
}
EventFns.RaiseOnce(ref Completed, this, EventArgs.Empty);
}
private void PublishEntities(IEnumerable <object> exportEntities)
{
var syncData = new SyncDataMessage(this, exportEntities, _deletedEntityKeys);
EventFns.Publish(syncData);
// Signal to our clients that data has changed
if (syncData.SavedEntities.Any() || syncData.DeletedEntityKeys.Any())
{
RaiseDataChangedEvent(syncData.SavedEntities, syncData.DeletedEntityKeys);
}
}
/// <summary>
/// Save the current <see cref="SessionState" />. Any <see cref="Frame" /> instances
/// registered with <see cref="RegisterFrame" /> will also preserve their current
/// navigation stack, which in turn gives their active <see cref="Page" /> an opportunity
/// to save its state.
/// </summary>
/// <returns>An asynchronous task that reflects when session state has been saved.</returns>
public static async Task SaveAsync()
{
try
{
// Notify Root Navigator and AuthenticationService that we are suspending
if (RootNavigatorLocator.IsAvailable)
{
EventFns.Forward(RootNavigatorLocator.GetPart(), new Suspending(SessionState));
}
if (AuthenticationServiceLocator.IsAvailable)
{
EventFns.Forward(AuthenticationServiceLocator.GetPart(), new Suspending(SessionState));
}
// Save the navigation state for all registered frames
foreach (var weakFrameReference in RegisteredFrames)
{
Frame frame;
if (weakFrameReference.TryGetTarget(out frame))
{
SaveFrameNavigationState(frame);
}
}
// Serialize the session state synchronously to avoid asynchronous access to shared
// state
var sessionData = new MemoryStream();
var serializer = new DataContractSerializer(typeof(Dictionary <string, object>), KnownTypes);
serializer.WriteObject(sessionData, _sessionState);
// Get an output stream for the SessionState file and write the state asynchronously
var file =
await
ApplicationData.Current.LocalFolder.CreateFileAsync(SessionStateFilename,
CreationCollisionOption.ReplaceExisting);
using (var fileStream = await file.OpenStreamForWriteAsync())
{
sessionData.Seek(0, SeekOrigin.Begin);
await sessionData.CopyToAsync(fileStream);
await fileStream.FlushAsync();
}
}
catch (Exception e)
{
throw new SuspensionManagerException(e);
}
}
private void OnComplete(INotifyCompletedArgs args)
{
if (Completed == null)
{
return;
}
var resultArgs = new ResultCompletionEventArgs
{
Error = args.IsErrorHandled ? null : args.Error,
WasCancelled = args.Cancelled
};
EventFns.RaiseOnce(ref Completed, this, resultArgs);
}
/// <summary>
/// Restores previously saved <see cref="SessionState" />. Any <see cref="Frame" /> instances
/// registered with <see cref="RegisterFrame" /> will also restore their prior navigation
/// state, which in turn gives their active <see cref="Page" /> an opportunity restore its
/// state.
/// </summary>
/// <returns>
/// An asynchronous task that reflects when session state has been read. The
/// content of <see cref="SessionState" /> should not be relied upon until this task
/// completes.
/// </returns>
public static async Task RestoreAsync()
{
_sessionState = new Dictionary <String, Object>();
try
{
// Get the input stream for the SessionState file
var file = await ApplicationData.Current.LocalFolder.GetFileAsync(SessionStateFilename);
using (var inStream = await file.OpenSequentialReadAsync())
{
// Deserialize the Session State
var serializer = new DataContractSerializer(typeof(Dictionary <string, object>), KnownTypes);
_sessionState = (Dictionary <string, object>)serializer.ReadObject(inStream.AsStreamForRead());
}
// Notify Root Navigator and AuthenticationService that we are restoring
if (RootNavigatorLocator.IsAvailable)
{
EventFns.Forward(RootNavigatorLocator.GetPart(), new Restoring(SessionState));
}
if (AuthenticationServiceLocator.IsAvailable)
{
EventFns.Forward(AuthenticationServiceLocator.GetPart(), new Restoring(SessionState));
}
// Restore any registered frames to their saved state
foreach (var weakFrameReference in RegisteredFrames)
{
Frame frame;
if (weakFrameReference.TryGetTarget(out frame))
{
frame.ClearValue(FrameSessionStateProperty);
RestoreFrameNavigationState(frame);
}
}
}
catch (Exception e)
{
throw new SuspensionManagerException(e);
}
}
/// <summary>
/// Triggers the PrincipalChanged event.
/// </summary>
protected virtual void OnPrincipalChanged()
{
NotifyPropertyChanged("Principal");
PrincipalChanged(this, EventArgs.Empty);
EventFns.Publish(new PrincipalChangedMessage(Principal));
}
