public async Task <ExhibitDTO> LoadExhibitAsync(string hallId, string standId, string id, ExhibitDTO exhibitCached, CancellationToken cancellationToken)
{
if (CheckConnection())
{
try
{
string content = await LoadAsync(new Uri($"{App.UriBase}/api/Exhibits/{hallId}/{standId}/{id}?hash={exhibitCached.GetHashCode()}"), cancellationToken);
if (string.IsNullOrEmpty(content))
{
return(exhibitCached);
}
ExhibitDTO exhibit = JsonConvert.DeserializeObject <ExhibitDTO>(content);
await DependencyService.Get <CachingService>().WriteExhibitAsync(exhibit);
return(exhibit);
}
catch (Exception ex)
{
if (ex is HttpRequestException || ex is WebException)
{
return(exhibitCached);
}
else if (ex is OperationCanceledException)
{
throw ex;
}
}
}
return(exhibitCached);
}
public async Task <ExhibitDTO> ReadExhibitAsync(string id)
{
if (!App.Settings.UseCache)
{
return(null);
}
string language = Thread.CurrentThread.CurrentUICulture.Name.Substring(0, 2);
var keys = await BlobCache.LocalMachine.GetAllKeys();
if (keys.Contains($"{language}{id}"))
{
_logger.Info($"Read exhibit {language}-{id} from cache");
// Read exhibit
ExhibitDTO exhibit = await BlobCache.LocalMachine.GetObject <ExhibitDTO>($"{language}{id}");
// Read photos description
exhibit.Photos = await BlobCache.LocalMachine.GetObject <List <PhotoInfoDTO> >($"{language}{id}description");
// Read photos
var photosBytes = await BlobCache.LocalMachine.GetObject <List <byte[]> >($"photo{id}");
int index = 0;
foreach (var photo in photosBytes)
{
exhibit.Photos[index++].Photo = photo;
}
return(exhibit);
}
return(null);
}
public async void GetAsync_RecordDoesNotExist_ShouldReturnNull()
{
const string id = "111111112111111111111113";
// Arrange
ExhibitDTO expected = null;
// Act
var actual = await _service.GetAsync(httpRequest, HallId, StandId, id);
// Assert
Assert.Equal(expected, actual);
}
public async Task <ExhibitDTO> GetAsync(HttpRequest request, string hallId, string standId, string id)
{
// Get language from header
StringValues language = LanguageConstants.LanguageDefault;
request?.Headers?.TryGetValue("Accept-Language", out language);
var exhibit = await _exhibitsRepository.GetAsync(hallId, standId, id);
MapperConfiguration mapperConfiguration = null;
MapperConfiguration mapperConfigurationPhoto = null;
ExhibitDTO exhibitDTO = null;
if (exhibit != null)
{
// Create mapping depending on language
switch (language)
{
case LanguageConstants.LanguageRu:
mapperConfiguration = ExhibitsMappingConfigurations.GetRuConfiguration;
mapperConfigurationPhoto = ExhibitsMappingConfigurations.GetRuPhotoConfiguration;
break;
case LanguageConstants.LanguageEn:
mapperConfiguration = ExhibitsMappingConfigurations.GetEnConfiguration;
mapperConfigurationPhoto = ExhibitsMappingConfigurations.GetEnPhotoConfiguration;
break;
case LanguageConstants.LanguageBy:
mapperConfiguration = ExhibitsMappingConfigurations.GetByConfiguration;
mapperConfigurationPhoto = ExhibitsMappingConfigurations.GetByPhotoConfiguration;
break;
default:
mapperConfiguration = ExhibitsMappingConfigurations.GetEnConfiguration;
mapperConfigurationPhoto = ExhibitsMappingConfigurations.GetEnPhotoConfiguration;
break;
}
var mapper = new Mapper(mapperConfiguration);
exhibitDTO = mapper.Map <ExhibitDTO>(exhibit);
mapper = new Mapper(mapperConfigurationPhoto);
var photoInfoDTO = mapper.Map <List <PhotoInfoDTO> >(exhibit.Photos);
exhibitDTO.Photos = photoInfoDTO;
}
return(exhibitDTO);
}
public async Task <ExhibitDTO> LoadExhibitAsync(string hallId, string standId, string id, CancellationToken cancellationToken)
{
if (CheckConnection())
{
string content = await LoadAsync(new Uri($"{App.UriBase}/api/Exhibits/{hallId}/{standId}/{id}"), cancellationToken);
ExhibitDTO exhibit = JsonConvert.DeserializeObject <ExhibitDTO>(content);
await DependencyService.Get <CachingService>().WriteExhibitAsync(exhibit);
return(exhibit);
}
throw new Error()
{
ErrorCode = Errors.Failed_Connection, Info = AppResources.ErrorMessage_LoadingFaild
};
}
public async Task WriteExhibitAsync(ExhibitDTO exhibit)
{
if (!App.Settings.UseCache)
{
return;
}
string language = Thread.CurrentThread.CurrentUICulture.Name.Substring(0, 2);
_logger.Info($"Write exhibit {language}-{exhibit.Id} to cache");
// Copy photos
List <PhotoInfoDTO> photos = new List <PhotoInfoDTO>(exhibit.Photos);
// Copy bytes
var photosBytes = new List <byte[]>();
foreach (var photo in exhibit.Photos)
{
photosBytes.Add(photo.Photo);
photo.Photo = null;
}
// Save images themselves
await BlobCache.LocalMachine.InsertObject($"photo{exhibit.Id}", photosBytes);
// Save images description
await BlobCache.LocalMachine.InsertObject($"{language}{exhibit.Id}description", exhibit.Photos);
exhibit.Photos = null;
// Save exhibit description
await BlobCache.LocalMachine.InsertObject($"{language}{exhibit.Id}", exhibit);
for (int i = 0; i < photos.Count; i++)
{
photos[i].Photo = photosBytes[i];
}
exhibit.Photos = photos;
}
public void WriteExhibitAsync(ExhibitDTO exhibit, Dictionary <string, object> cache, Dictionary <string, object> cachePhotos, string language)
{
// Copy bytes
var photosBytes = new List <byte[]>();
foreach (var photo in exhibit.Photos)
{
photosBytes.Add(photo.Photo);
photo.Photo = null;
}
if (!_isPhotosSaved)
{
// Save images themselves
cachePhotos.Add($"photo{exhibit.Id}", photosBytes);
}
// Save images description
cache.Add($"{language}{exhibit.Id}description", exhibit.Photos);
exhibit.Photos = null;
// Save exhibit description
cache.Add($"{language}{exhibit.Id}", exhibit);
}
/// <summary>
///
/// </summary>
/// <param name="exhibit">Exhibit to display</param>
/// <param name="navigation">Instance of navigation</param>
/// <param name="navigation">Instance of navigation</param>
public ExhibitGalleryViewModel(ExhibitDTO exhibit, INavigation navigation) : base(navigation)
{
Exhibit = exhibit;
Photos = new ObservableCollection <PhotoInfoDTO>();
}
/// <summary>
///
/// </summary>
/// <param name="exhibit">Exhibit to display</param>
public ExhibitsArticle(ExhibitDTO exhibit)
{
InitializeComponent();
BindingContext = new ExhibitsArticleViewModel(exhibit, Navigation);
}
/// <summary>
///
/// </summary>
/// <param name="exhibit">Exhibit to display</param>
public ExhibitGallery(ExhibitDTO exhibit)
{
InitializeComponent();
BindingContext = new ExhibitGalleryViewModel(exhibit, Navigation);
}
/// <summary>
///
/// </summary>
/// <param name="exhibit">Exhibit to display</param>
/// <param name="navigation">Instance of navigation</param>
/// <param name="hallId">Id of the hall</param>
/// <param name="standId">Id of the stand</param>
public ExhibitsArticleViewModel(ExhibitDTO exhibit, INavigation navigation) : base(navigation)
{
Exhibit = exhibit;
Photos = new ObservableCollection <ImageSource>();
}
