/// <summary>
/// Tries to send locally stored elements if any and if there's a network connection.
/// This method is called automatically when a new instance of a MixpanelClient is created.
/// </summary>
/// <returns></returns>
public async Task TrySendLocalElements()
{
bool storeUpdated = false;
MixpanelStore store = null;
await Task.Run(() => store = MixpanelStore.Load());
if (store.Events.Count > 0)
{
IList <TrackingEvent> sentItems = await Track <TrackingEvent>(store.Events);
foreach (TrackingEvent item in sentItems)
{
store.Events.Remove(item);
}
storeUpdated = true;
}
if (store.ProfileUpdates.Count > 0)
{
IList <ProfileUpdate> sentItems = await Track <ProfileUpdate>(store.ProfileUpdates);
foreach (ProfileUpdate item in sentItems)
{
store.ProfileUpdates.Remove(item);
}
storeUpdated = true;
}
if (storeUpdated)
{
await Task.Run(() => store.Save());
}
}
/// <summary>
/// Saves element locally. Event will be sent on next call of "TrySendLocalElements".
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="element">The element.</param>
/// <returns></returns>
public async Task SaveElement <T>(T element) where T : MixpanelEntity
{
// Store uses a mutex, load & save on a background thread to avoid blocking UI.
await Task.Run(() =>
{
MixpanelStore store = MixpanelStore.Load();
if (!store.Contains(element))
{
store.Add(element);
}
store.Save();
});
}
internal static MixpanelStore Load()
{
MixpanelStore store = null;
try
{
// Wait until it is safe to enter.
_mutex.WaitOne();
Task <StorageFile> fileTask = Utilities.SafeGetFile(ApplicationData.Current.LocalFolder, FileName);
StorageFile file = fileTask.Result;
if (file == null)
{
return(new MixpanelStore());
}
Task <Stream> streamTask = file.OpenStreamForReadAsync();
using (StreamReader reader = new StreamReader(streamTask.Result, Utilities.DefaultEncoding))
{
string content = reader.ReadToEnd();
store = JsonConvert.DeserializeObject <MixpanelStore>(content);
}
}
catch (Exception ex)
{
// File is invalid: schema might have changed or something like that.
// Not a problem, let's return a brand new one.
Debug.WriteLine("Mixpanel> Could not load mixpanel events: " + ex.ToString());
}
finally
{
_mutex.ReleaseMutex();
}
if (store == null)
{
store = new MixpanelStore();
}
return(store);
}
