private async Task Translate()
{
if (_vm == null)
{
return;
}
if (string.IsNullOrWhiteSpace(_vm.Text))
{
return;
}
try
{
_cts?.Cancel();
_cts = new CancellationTokenSource();
ITranslator translator = new GoogleTranslator();
var sequence = new TranslationSequence(_vm.Text);
_vm.IsLoading = true;
SavedTranslationSequence saved = await ReadCache(sequence);
TranslationSequence result;
if (saved == null)
{
result = await translator.TranslateAsync(sequence, _vm.Language, _cts.Token);
saved = new SavedTranslationSequence
{
SourceTranslationSequence = sequence,
TranslationSequence = result,
Language = _vm.Language
};
}
else
{
result = saved.TranslationSequence;
}
_vm.Result = result.Sequence;
_vm.Suggestions = await GetSuggestions(result);
saved.LastTimeUsed = DateTime.Now;
_jsonParser.Cache.Add(saved);
}
catch (TranslationFailedException)
{
}
_vm.IsLoading = false;
}
private async void OnLoaded(object sender, RoutedEventArgs e)
{
SavedTranslationSequence last = _jsonParser.Cache.LastOrDefault();
_vm.Text = last?.SourceTranslationSequence.Sequence;
TranslationSequence lastTranslationSequence = last?.TranslationSequence;
_vm.Result = lastTranslationSequence?.Sequence;
_vm.Suggestions = await GetSuggestions(lastTranslationSequence);
_vm.Language = last?.Language ?? TranslateLanguages.Afrikaans;
await Task.Run(() => _jsonParser.Cache.RemoveAll(saved =>
{
TimeSpan timeSpan = DateTime.Now - saved.LastTimeUsed;
return(timeSpan.Days >= 7);
}));
}
private Task <SavedTranslationSequence> ReadCache(TranslationSequence sequence)
{
SavedTranslationSequence Enumerate()
{
SavedTranslationSequence savedSequence = null;
Parallel.ForEach(_jsonParser.Cache, (saved, state) =>
{
if (saved.SourceTranslationSequence.Sequence != sequence.Sequence ||
saved.Language != _vm.Language)
{
return;
}
saved.LastTimeUsed = DateTime.Now;
savedSequence = saved;
state.Stop();
});
return(savedSequence);
}
return(Task.Run((Func <SavedTranslationSequence>)Enumerate));
}
