public void SubscribeToMessages()
{
MessagingCenter.Subscribe <LoginPage>(this, "AuthorLogin", (obj) =>
{
JournalDataStore.ResetClient();
});
MessagingCenter.Subscribe <NewJournalPage, Journal>(this, "AddJournal", async(obj, journal) =>
{
var _journal = journal as Journal;
Journals.Add(_journal);
try
{
await JournalDataStore.AddAsync(_journal);
LoadJournalsCommand.Execute(null);
}
catch (Exception e)
{
Debug.WriteLine("AddJournalMessage" + e);
if (!e.Message.Contains("A task was canceled"))
{
await App.Current.MainPage.DisplayAlert("Error", e.Message, "OK");
}
}
});
}
async Task ExecuteLoadJournalsCommand()
{
if (IsBusy)
{
return;
}
IsBusy = true;
try
{
JournalsListView.IsVisible = true;
JournalsNotFound.IsVisible = false;
var journals = await JournalDataStore.GetAllAsync(true);
if (journals != null && journals.Any())
{
Journals.Clear();
foreach (var journal in journals)
{
Journals.Add(journal);
}
}
}
catch (Exception ex)
{
Debug.WriteLine("ExecuteLoadJournalsCommand" + ex);
if (ex.Message.Contains("No journals found"))
{
Journals.Clear();
JournalsListView.IsVisible = false;
JournalsNotFound.IsVisible = true;
}
// Logout user if session expired
if (ex.Message.Contains("Unauthorized") || ex.Message.Contains("Internal Server Error"))
{
this.UnsubscribeFromMessages();
MessagingCenter.Send(this, "AuthorLogout");
}
}
finally
{
IsBusy = false;
}
}