/// <summary>
/// Creates the default <see cref="IMapImageRetriever"/>, which is a
/// database cache that falls back to HERE services.
/// </summary>
/// <param name="serviceProvider">The service provider.</param>
/// <returns>The default <see cref="IMapImageRetriever"/>.</returns>
public static IMapImageRetriever CreateDefault(IServiceProvider serviceProvider)
{
var hereMapsRetriever = new HEREMapImageRetriever(
serviceProvider.GetService <IGeocodeClient>(),
serviceProvider.GetService <IMapImageClient>());
var cacheRetriever = new CachedMapImageRetriever(
serviceProvider.GetService <FvectContext>(),
hereMapsRetriever,
serviceProvider.GetService <IOptionsMonitor <BackendOptions> >(),
serviceProvider.GetService <ILogger <CachedMapImageRetriever> >());
return(cacheRetriever);
}
public async Task CachableImageWithinCacheRetrievesFromCache()
{
using var db = new TestDatabase(this.outputHelper);
var zipCode = "1234 AB";
var zipCodeNormalized = "1234";
var houseNumber = 1;
var zoomLevel = ZoomLevel.CITY;
var imageData = new byte[] { 0, 1, 2, 3, };
var optionsMock = OptionsTestHelper.CreateBackendOptionsMock(
x => x.Geo.CacheTimesPerZoomLevel = ImmutableDictionary <ZoomLevel, TimeSpan> .Empty.Add(
zoomLevel,
TimeSpan.MaxValue));
var innerMock = new Mock <IMapImageRetriever>();
var logger = LoggingTestHelper.CreateLogger <CachedMapImageRetriever>(this.outputHelper);
var imageInCache = new MapImage
{
PostalCode = zipCodeNormalized,
ImageData = imageData,
ZoomLevel = zoomLevel,
LastTimeAccessed = DateTimeOffset.UtcNow,
};
using (var ctx = await db.CreateContextAsync().ConfigureAwait(true))
{
ctx.MapImages.Add(imageInCache);
await ctx.SaveChangesAsync().ConfigureAwait(true);
}
Stream?imageStream = default;
using (var ctx = await db.CreateContextAsync().ConfigureAwait(true))
{
var retriever = new CachedMapImageRetriever(
ctx,
innerMock.Object,
optionsMock.Object,
logger);
imageStream = await retriever.GetMapImageAsync(
zipCode,
houseNumber,
zoomLevel,
default)
.ConfigureAwait(true);
}
imageStream
.Should()
.NotBeNull(
because: "the value should have been retrieved from the cache");
using var ms = new MemoryStream();
imageStream !.Position = 0;
await imageStream.CopyToAsync(ms).ConfigureAwait(true);
ms.ToArray()
.Should()
.BeEquivalentTo(
imageData,
because: "the retrieved value should be equal to the data intially stored in the cache");
innerMock.VerifyNoOtherCalls();
}
