public void TileFetcherShouldBehaveProperlyWithNoisyResponses()
{
// Arrange
var schema = new GlobalSphericalMercator();
var tileSource = new TileSource(new SometimesFailingTileProvider(), schema);
var memoryCache = new MemoryCache <Feature>(14, 17);
var tileFetcher = new TileFetcher(tileSource, memoryCache);
var random = new Random(31747074);
var tiles = new List <Feature>();
// Act
for (int i = 0; i < 100; i++)
{
var randomLevel = "5";
var randomCol = random.Next(schema.GetMatrixWidth(randomLevel));
var randomRow = random.Next(schema.GetMatrixHeight(randomLevel));
var tileRange = new TileRange(randomCol - 2, randomRow - 2, 5, 5);
var unitsPerPixel = schema.Resolutions[randomLevel].UnitsPerPixel;
var extent = TileTransform.TileToWorld(tileRange, randomLevel, schema);
tileFetcher.ViewChanged(TileTransform.TileToWorld(tileRange, randomLevel, schema).ToBoundingBox(), unitsPerPixel);
var tileInfos = schema.GetTileInfos(extent, randomLevel);
foreach (var tileInfo in tileInfos)
{
tiles.Add(memoryCache.Find(tileInfo.Index));
}
}
// Assert
Assert.True(tiles.Count > 0);
Assert.True(memoryCache.TileCount == 0);
}
private static ITileCache <Feature> PopulateMemoryCache(GlobalSphericalMercator schema, MemoryCache <Feature> cache, int levelId)
{
for (var i = levelId; i >= 0; i--)
{
var tiles = schema.GetTileInfos(schema.Extent, i.ToString(CultureInfo.InvariantCulture));
foreach (var tile in tiles)
{
if ((tile.Index.Col + tile.Index.Row) % 2 == 0) // Add only 50% of the tiles with the arbitrary rule.
{
cache.Add(tile.Index, new Feature());
}
}
}
return(cache);
}
private static ITileCache <IFeature?> PopulateMemoryCache(GlobalSphericalMercator schema, MemoryCache <IFeature?> cache, int levelId)
{
for (var i = levelId; i >= 0; i--)
{
var tiles = schema.GetTileInfos(schema.Extent, i);
foreach (var tile in tiles)
{
if ((tile.Index.Col + tile.Index.Row) % 2 == 0) // Add only 50% of the tiles with the arbitrary rule.
{
cache.Add(tile.Index, new RasterFeature(new MRaster(Array.Empty <byte>(), new MRect(0, 0, 1, 1))));
}
}
}
return(cache);
}
public void GetTilesInViewWithBiggerExtentThanTileSchemaExtentReturnsCorrectNumberOfTiles()
{
// arrange
var schema = new GlobalSphericalMercator();
var requestExtent = GrowExtent(schema.Extent, schema.Extent.Width);
var counter = 0;
foreach (var resolution in schema.Resolutions.OrderByDescending(r => r.Value.UnitsPerPixel))
{
// act
var tileInfos = schema.GetTileInfos(requestExtent, resolution.Value.Level).ToList();
// assert
Assert.True(tileInfos.Count == (int)Math.Round(Math.Pow(4, counter++)));
if (counter >= 6)
{
break;
}
}
}
