protected async override void OnAppearing ()
{
List<Place> places;
EnableLoader ();
bool exceptionFlag = false;
string exceptionMsg = string.Empty;
try {
var service = DependencyService.Get<ILocationService> ();
var position = service.GetPosition();
//optimisation thing: this can be done in parallel
DateTimeOffset datePingServer = await PartyAdvisorApiHelper.GetPlacePing ();
long? datePingTicksLocal = await _db.GetObjectAsync<long?>(Const.PLACES_AKAVACHE_PING_KEY);
//outdated places info
//comparison of ticks bc it looks like the serialization of datetimeoffset is not as precise as comparison of ticks
if (datePingTicksLocal == null || datePingTicksLocal.Value < datePingServer.Ticks)
{
places = await GetServerPlaces ();
//we save the new places
await _db.InsertObjectAsync<List<Place>> (Const.PLACES_AKAVACHE_KEY, places);
//we save the ping value
await _db.InsertObjectAsync<long?> (Const.PLACES_AKAVACHE_PING_KEY, datePingServer.Ticks);
}
//updated infos
else
{
//test if places already saved in database
places = await _db.GetObjectAsync<List<Place>>(Const.PLACES_AKAVACHE_KEY);
if (places == null)
{
places = await GetServerPlaces();
await _db.InsertObjectAsync<List<Place>> (Const.PLACES_AKAVACHE_KEY, places);
}
}
List<PlaceDistance> pdList = new List<PlaceDistance>();
foreach(var place in places)
{
var pd = new PlaceDistance(place, position);
pdList.Add(pd);
}
lvPlaces.ItemsSource = pdList.OrderBy(x=>x.Distance).ToList();
}
catch(WebException ex)
{
int status = (int)ex.Status;
exceptionFlag = true;
//name resolution failure, aka no internet
exceptionMsg = status == 1 ? Const.APP_REQUIRES_INTERNET : Const.GLOBAL_ERROR_MSG;
}
catch(PositionNotFoundException ex)
{
exceptionFlag = true;
exceptionMsg = ex.Message;
}
catch(Exception ex)
{
exceptionFlag = true;
exceptionMsg = Const.GLOBAL_ERROR_MSG;
}
finally
{
DisableLoader ();
}
if (exceptionFlag)
{
await DisplayAlert ("Error", exceptionMsg, "Ok");
await App.Navigation.PopModalAsync ();
}
}
protected async override void OnAppearing()
{
List <Place> places;
EnableLoader();
bool exceptionFlag = false;
string exceptionMsg = string.Empty;
try {
var service = DependencyService.Get <ILocationService> ();
var position = service.GetPosition();
//optimisation thing: this can be done in parallel
DateTimeOffset datePingServer = await PartyAdvisorApiHelper.GetPlacePing();
long?datePingTicksLocal = await _db.GetObjectAsync <long?>(Const.PLACES_AKAVACHE_PING_KEY);
//outdated places info
//comparison of ticks bc it looks like the serialization of datetimeoffset is not as precise as comparison of ticks
if (datePingTicksLocal == null || datePingTicksLocal.Value < datePingServer.Ticks)
{
places = await GetServerPlaces();
//we save the new places
await _db.InsertObjectAsync <List <Place> > (Const.PLACES_AKAVACHE_KEY, places);
//we save the ping value
await _db.InsertObjectAsync <long?> (Const.PLACES_AKAVACHE_PING_KEY, datePingServer.Ticks);
}
//updated infos
else
{
//test if places already saved in database
places = await _db.GetObjectAsync <List <Place> >(Const.PLACES_AKAVACHE_KEY);
if (places == null)
{
places = await GetServerPlaces();
await _db.InsertObjectAsync <List <Place> > (Const.PLACES_AKAVACHE_KEY, places);
}
}
List <PlaceDistance> pdList = new List <PlaceDistance>();
foreach (var place in places)
{
var pd = new PlaceDistance(place, position);
pdList.Add(pd);
}
lvPlaces.ItemsSource = pdList.OrderBy(x => x.Distance).ToList();
}
catch (WebException ex)
{
int status = (int)ex.Status;
exceptionFlag = true;
//name resolution failure, aka no internet
exceptionMsg = status == 1 ? Const.APP_REQUIRES_INTERNET : Const.GLOBAL_ERROR_MSG;
}
catch (PositionNotFoundException ex)
{
exceptionFlag = true;
exceptionMsg = ex.Message;
}
catch (Exception ex)
{
exceptionFlag = true;
exceptionMsg = Const.GLOBAL_ERROR_MSG;
}
finally
{
DisableLoader();
}
if (exceptionFlag)
{
await DisplayAlert("Error", exceptionMsg, "Ok");
await App.Navigation.PopModalAsync();
}
}
