private void InitializeAccounts()
{
_accountManager = new AccountManager();
if (AccountManager.Accounts.Count == 0)
{
RootFrame.Navigate(new Uri("/AccountsPage.xaml", UriKind.Relative));
}
}
/// <summary>
/// Agent that runs a scheduled task
/// </summary>
/// <param name="task">
/// The invoked task
/// </param>
/// <remarks>
/// This method is called when a periodic or resource intensive task is invoked
/// </remarks>
protected override async void OnInvoke(ScheduledTask task)
{
// This is invoked at most every 30 minutes. It will run for at most 25 seconds.
// We are limited to 20mb of RAM (or 11 on low-end devices).
// http://msdn.microsoft.com/en-us/library/windowsphone/develop/hh202942(v=vs.105).aspx
//
// All this means that we have to sync mail very efficiently.
// - Download messages and save them to disk one at a time rather than keeping the whole
// list in memory.
// - Download messages in parts and save them seperately (Flags, headers, labels,
// body parts / attachments). This also means we don't have to keep loading and re-saving
// messages when only the labels or flags change.
// - Consider streaming larger sections directly to disk.
// - Watch the time, don't start a new operation if we're running low. Getting cut off in
// the middle can leave us with corrupted data on disk. If there's too much mail we can
// download more of it next time. Use a CancelationToken w/CancelAfter to track the time.
// When called from the UI the CancelationToken can be used for a manual cancel instead.
// Check the time before any save operation. Save only at points where a later sync could resume.
// It doesn't matter if network operations get interupted, and it's harder to guess how long they'll take.
//
CancellationTokenSource cts = new CancellationTokenSource();
try
{
#if DEBUG_AGENT
cts.Token.Register(() =>
{
ShellToast toast = new ShellToast();
toast.Title = "Gmail";
toast.Content = "Task cancelled.";
toast.Show();
});
#endif
if (task is PeriodicTask)
{
#if DEBUG_AGENT
ShellToast toast = new ShellToast();
toast.Title = "Gmail";
toast.Content = "Periodic-task running.";
toast.Show();
#endif
// Time limit 25 seconds, round down to avoid corrupting data on disk.
// Give us time to do notifications, even if it's only for partial data.
cts.CancelAfter(TimeSpan.FromSeconds(20));
}
else
{
// TODO: Consider scheduling a resource intensive task for a full daily sync.
// Time limit 10 minutes, round down to avoid corrupting data on disk.
cts.CancelAfter(new TimeSpan(0, 9, 45));
#if DEBUG_AGENT
ShellToast toast = new ShellToast();
toast.Title = "Gmail";
toast.Content = "Resource-intensive task running.";
toast.Show();
#endif
}
AccountManager accountManager = new AccountManager();
Tuple<int, bool> syncResults = await accountManager.SyncAllMailAsync(cts.Token);
int newMailCount = syncResults.Item1;
bool notify = syncResults.Item2;
if (task is ResourceIntensiveTask)
{
// TODO: Verbose GC messages no longer referenced by any label.
}
if (notify)
{
// The toast will not be shown if the foreground application is running.
ShellToast toast = new ShellToast();
toast.Title = "Gmail";
toast.Content = "You have " + newMailCount + " new messages";
toast.Show();
}
#if DEBUG_AGENT
else
{
ShellToast toast = new ShellToast();
toast.Title = "Gmail";
toast.Content = "You still have " + newMailCount + " new messages";
toast.Show();
}
#endif
// Update the live tile and lock screen
ShellTile tile = ShellTile.ActiveTiles.FirstOrDefault();
if (tile != null)
{
IconicTileData data = new IconicTileData();
data.Count = newMailCount;
tile.Update(data);
// TODO: Include message snyppits for new mail on large tile and lock screen.
}
#if DEBUG_AGENT
// If debugging is enabled, launch the agent again in one minute.
ScheduledActionService.LaunchForTest(task.Name, TimeSpan.FromSeconds(60));
#endif
}
catch(Exception ex)
{
#if DEBUG
ShellToast toast = new ShellToast();
toast.Title = ex.GetType().Name;
toast.Content = ex.Message;
toast.Show();
#else
throw;
#endif
}
NotifyComplete();
}