public void TileFetcherWithFailingFetchesShouldTryAgain()
{
// Arrange
var tileProvider = new FailingTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
var cache = new MemoryCache <Feature>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, (tileInfo) => TileToFeature(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var level = "3";
var tilesInLevel = 64;
// Act
fetchDispatcher.SetViewport(tileSchema.Extent.ToBoundingBox(), tileSchema.Resolutions[level].UnitsPerPixel);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
}
// do it again
fetchDispatcher.SetViewport(tileSchema.Extent.ToBoundingBox(), tileSchema.Resolutions[level].UnitsPerPixel);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
}
// Assert
Assert.AreEqual(tilesInLevel * 2, tileProvider.TotalCount); // tried all tiles twice
}
public void TileFetcherShouldRequestAllTilesJustOnes()
{
// Arrange
var tileProvider = new CountingTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
var cache = new MemoryCache <Feature>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, (tileInfo) => TileToFeature(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var level = "4";
var expextedTiles = 256;
// Act
// Get all tiles of level 3
fetchDispatcher.SetViewport(tileSchema.Extent.ToBoundingBox(), tileSchema.Resolutions[level].UnitsPerPixel);
tileMachine.Start();
// Assert
while (fetchDispatcher.Busy)
{
}
Assert.AreEqual(expextedTiles, tileProvider.CountByTile.Keys.Count);
Assert.AreEqual(expextedTiles, tileProvider.CountByTile.Values.Sum());
Assert.AreEqual(expextedTiles, tileProvider.TotalCount);
}
public void TileRequestThatReturnsNullShouldNotBeRequestedAgain()
{
// Arrange
var tileProvider = new NullTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
var cache = new MemoryCache <Feature>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, (tileInfo) => TileToFeature(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var level = "3";
var tilesInLevel = 64;
// Act
fetchDispatcher.SetViewport(tileSchema.Extent.ToBoundingBox(), tileSchema.Resolutions[level].UnitsPerPixel);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
}
// do it again
fetchDispatcher.SetViewport(tileSchema.Extent.ToBoundingBox(), tileSchema.Resolutions[level].UnitsPerPixel);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
// Assert
Assert.AreEqual(tilesInLevel, tileProvider.TotalCount);
}
public void TileFetcherShouldRequestAllTilesJustOnes()
{
// Arrange
var tileProvider = new CountingTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
using var cache = new MemoryCache <IFeature?>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, async tileInfo => await TileToFeatureAsync(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var level = 3;
var expectedTiles = 64;
var fetchInfo = new FetchInfo(tileSchema.Extent.ToMRect(), tileSchema.Resolutions[level].UnitsPerPixel);
// Act
// Get all tiles of level 3
fetchDispatcher.SetViewport(fetchInfo);
tileMachine.Start();
// Assert
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
Assert.AreEqual(expectedTiles, tileProvider.CountByTile.Keys.Count);
Assert.AreEqual(expectedTiles, tileProvider.CountByTile.Values.Sum());
Assert.AreEqual(expectedTiles, tileProvider.TotalCount);
}
public void RepeatedRestartsShouldNotCauseInfiniteLoop()
{
// Arrange
var tileProvider = new CountingTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
var cache = new MemoryCache <Feature>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, (tileInfo) => TileToFeature(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var numberOfWorkers = 8;
var numberOfRestarts = 3;
// Act
for (int i = 0; i < numberOfRestarts; i++)
{
fetchDispatcher.SetViewport(tileSchema.Extent.ToBoundingBox(), tileSchema.Resolutions["3"].UnitsPerPixel);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
}
}
// Assert
Assert.Greater(numberOfWorkers * numberOfRestarts, FetchWorker.RestartCounter);
}
/// <summary>
/// Create tile layer for given tile source
/// </summary>
/// <param name="source">Tile source to use for this layer</param>
/// <param name="minTiles">Minimum number of tiles to cache</param>
/// <param name="maxTiles">Maximum number of tiles to cache</param>
/// <param name="maxRetries">Unused</param>
/// <param name="dataFetchStrategy">Strategy to get list of tiles for given extent</param>
/// <param name="renderFetchStrategy"></param>
/// <param name="minExtraTiles">Number of minimum extra tiles for memory cache</param>
/// <param name="maxExtraTiles">Number of maximum extra tiles for memory cache</param>
// ReSharper disable once UnusedParameter.Local // Is public and won't break this now
public TileLayer(ITileSource source = null, int minTiles = 200, int maxTiles = 300,
IDataFetchStrategy dataFetchStrategy = null, IRenderFetchStrategy renderFetchStrategy = null,
int minExtraTiles = -1, int maxExtraTiles = -1, Func <TileInfo, Feature> fetchTileAsFeature = null)
{
MemoryCache = new MemoryCache <Feature>(minTiles, maxTiles);
Style = new VectorStyle {
Outline = { Color = Color.FromArgb(0, 0, 0, 0) }
}; // initialize with transparent outline
_tileSource = source;
if (_tileSource != null)
{
if (Attribution == null)
{
Attribution = new Hyperlink();
}
Attribution.Text = _tileSource.Attribution?.Text;
Attribution.Url = _tileSource.Attribution?.Url;
}
_envelope = _tileSource?.Schema?.Extent.ToBoundingBox();
dataFetchStrategy = dataFetchStrategy ?? new DataFetchStrategy(3);
_renderFetchStrategy = renderFetchStrategy ?? new RenderFetchStrategy();
_minExtraTiles = minExtraTiles;
_maxExtraTiles = maxExtraTiles;
_tileFetchDispatcher = new TileFetchDispatcher(MemoryCache, source.Schema, fetchTileAsFeature ?? ToFeature, dataFetchStrategy);
_tileFetchDispatcher.DataChanged += TileFetchDispatcherOnDataChanged;
_tileFetchDispatcher.PropertyChanged += TileFetchDispatcherOnPropertyChanged;
}
public void RepeatedRestartsShouldNotCauseInfiniteLoop()
{
// Arrange
var tileProvider = new CountingTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
using var cache = new MemoryCache <IFeature?>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, async tileInfo => await TileToFeatureAsync(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var numberOfWorkers = 8;
var numberOfRestarts = 3;
var fetchInfo = new FetchInfo(tileSchema.Extent.ToMRect(), tileSchema.Resolutions[3].UnitsPerPixel);
// Act
for (var i = 0; i < numberOfRestarts; i++)
{
fetchDispatcher.SetViewport(fetchInfo);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
}
// Assert
Assert.Greater(numberOfWorkers * numberOfRestarts, FetchWorker.RestartCounter);
}
public void TileFetcherWithFailingFetchesShouldTryAgain()
{
// Arrange
var tileProvider = new FailingTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
using var cache = new MemoryCache <IFeature?>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, async tileInfo => await TileToFeatureAsync(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var level = 3;
var tilesInLevel = 64;
var fetchInfo = new FetchInfo(tileSchema.Extent.ToMRect(), tileSchema.Resolutions[level].UnitsPerPixel);
// Act
fetchDispatcher.SetViewport(fetchInfo);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
// Act again
fetchDispatcher.SetViewport(fetchInfo);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
// Assert
Assert.AreEqual(tilesInLevel * 2, tileProvider.TotalCount); // tried all tiles twice
}
/// <summary>
/// Create tile layer for given tile source
/// </summary>
/// <param name="source">Tile source to use for this layer</param>
/// <param name="minTiles">Minimum number of tiles to cache</param>
/// <param name="maxTiles">Maximum number of tiles to cache</param>
/// <param name="maxRetries">Unused</param>
/// <param name="fetchStrategy">Strategy to get list of tiles for given extent</param>
/// <param name="renderFetchStrategy"></param>
/// <param name="minExtraTiles">Number of minimum extra tiles for memory cache</param>
/// <param name="maxExtraTiles">Number of maximum extra tiles for memory cache</param>
// ReSharper disable once UnusedParameter.Local // Is public and won't break this now
public TileLayer(ITileSource source = null, int minTiles = 200, int maxTiles = 300, int maxRetries = 2, IFetchStrategy fetchStrategy = null,
IRenderGetStrategy renderFetchStrategy = null, int minExtraTiles = -1, int maxExtraTiles = -1)
{
MemoryCache = new MemoryCache<Feature>(minTiles, maxTiles);
Style = new VectorStyle { Outline = { Color = Color.FromArgb(0, 0, 0, 0) } }; // initialize with transparent outline
var fetchStrategy1 = fetchStrategy ?? new FetchStrategy(3);
_renderStrategy = renderFetchStrategy ?? new RenderGetStrategy();
_minExtraTiles = minExtraTiles;
_maxExtraTiles = maxExtraTiles;
_tileFetchDispatcher = new TileFetchDispatcher(MemoryCache, fetchStrategy1);
_tileFetchDispatcher.DataChanged += TileFetchDispatcherOnDataChanged;
_tileFetchDispatcher.PropertyChanged += TileFetchDispatcherOnPropertyChanged;
_fetchMachine = new FetchMachine(_tileFetchDispatcher);
SetTileSource(source);
}
/// <summary>
/// Create tile layer for given tile source
/// </summary>
/// <param name="tileSource">Tile source to use for this layer</param>
/// <param name="minTiles">Minimum number of tiles to cache</param>
/// <param name="maxTiles">Maximum number of tiles to cache</param>
/// <param name="dataFetchStrategy">Strategy to get list of tiles for given extent</param>
/// <param name="renderFetchStrategy"></param>
/// <param name="minExtraTiles">Number of minimum extra tiles for memory cache</param>
/// <param name="maxExtraTiles">Number of maximum extra tiles for memory cache</param>
/// <param name="fetchTileAsFeature">Fetch tile as feature</param>
// ReSharper disable once UnusedParameter.Local // Is public and won't break this now
public TileLayer(ITileSource tileSource, int minTiles = 200, int maxTiles = 300,
IDataFetchStrategy?dataFetchStrategy = null, IRenderFetchStrategy?renderFetchStrategy = null,
int minExtraTiles = -1, int maxExtraTiles = -1, Func <TileInfo, Task <IFeature?> >?fetchTileAsFeature = null)
{
_tileSource = tileSource ?? throw new ArgumentException($"{tileSource} can not null");
MemoryCache = new MemoryCache <IFeature?>(minTiles, maxTiles);
Style = new RasterStyle();
Attribution.Text = _tileSource.Attribution?.Text;
Attribution.Url = _tileSource.Attribution?.Url;
_extent = _tileSource.Schema?.Extent.ToMRect();
dataFetchStrategy ??= new DataFetchStrategy(3);
_renderFetchStrategy = renderFetchStrategy ?? new RenderFetchStrategy();
_minExtraTiles = minExtraTiles;
_maxExtraTiles = maxExtraTiles;
_tileFetchDispatcher = new TileFetchDispatcher(MemoryCache, _tileSource.Schema, fetchTileAsFeature ?? ToFeatureAsync, dataFetchStrategy);
_tileFetchDispatcher.DataChanged += TileFetchDispatcherOnDataChanged;
_tileFetchDispatcher.PropertyChanged += TileFetchDispatcherOnPropertyChanged;
}
/// <summary>
/// Create tile layer for given tile source
/// </summary>
/// <param name="source">Tile source to use for this layer</param>
/// <param name="minTiles">Minimum number of tiles to cache</param>
/// <param name="maxTiles">Maximum number of tiles to cache</param>
/// <param name="maxRetries">Unused</param>
/// <param name="fetchStrategy">Strategy to get list of tiles for given extent</param>
/// <param name="renderGetStrategy"></param>
/// <param name="minExtraTiles">Number of minimum extra tiles for memory cache</param>
/// <param name="maxExtraTiles">Number of maximum extra tiles for memory cache</param>
// ReSharper disable once UnusedParameter.Local // Is public and won't break this now
public TileLayer(ITileSource source = null, int minTiles = 200, int maxTiles = 300,
IFetchStrategy fetchStrategy = null, IRenderGetStrategy renderGetStrategy = null,
int minExtraTiles = -1, int maxExtraTiles = -1, Func <TileInfo, Feature> fetchTileAsFeature = null)
{
MemoryCache = new MemoryCache <Feature>(minTiles, maxTiles);
Style = new VectorStyle {
Outline = { Color = Color.FromArgb(0, 0, 0, 0) }
}; // initialize with transparent outline
_tileSource = source;
_envelope = _tileSource?.Schema?.Extent.ToBoundingBox();
fetchStrategy = fetchStrategy ?? new FetchStrategy(3);
_renderGetStrategy = renderGetStrategy ?? new RenderGetStrategy();
_minExtraTiles = minExtraTiles;
_maxExtraTiles = maxExtraTiles;
_tileFetchDispatcher = new TileFetchDispatcher(MemoryCache, source.Schema, fetchTileAsFeature ?? ToFeature, fetchStrategy);
_tileFetchDispatcher.DataChanged += TileFetchDispatcherOnDataChanged;
_tileFetchDispatcher.PropertyChanged += TileFetchDispatcherOnPropertyChanged;
}
/// <summary>
/// Create tile layer for given tile source
/// </summary>
/// <param name="tileSource">Tile source to use for this layer</param>
/// <param name="minTiles">Minimum number of tiles to cache</param>
/// <param name="maxTiles">Maximum number of tiles to cache</param>
/// <param name="dataFetchStrategy">Strategy to get list of tiles for given extent</param>
/// <param name="renderFetchStrategy"></param>
/// <param name="minExtraTiles">Number of minimum extra tiles for memory cache</param>
/// <param name="maxExtraTiles">Number of maximum extra tiles for memory cache</param>
/// <param name="fetchTileAsFeature">Fetch tile as feature</param>
// ReSharper disable once UnusedParameter.Local // Is public and won't break this now
public TileLayer(ITileSource tileSource, int minTiles = 200, int maxTiles = 300,
IDataFetchStrategy?dataFetchStrategy = null, IRenderFetchStrategy?renderFetchStrategy = null,
int minExtraTiles = -1, int maxExtraTiles = -1, Func <TileInfo, IFeature?>?fetchTileAsFeature = null)
{
_tileSource = tileSource ?? throw new ArgumentException($"{tileSource} can not null");
MemoryCache = new MemoryCache <IFeature?>(minTiles, maxTiles);
Style = new VectorStyle {
Outline = { Color = Color.FromArgb(0, 0, 0, 0) }
}; // initialize with transparent outline
Attribution.Text = _tileSource.Attribution?.Text;
Attribution.Url = _tileSource.Attribution?.Url;
_extent = _tileSource.Schema?.Extent.ToMRect();
dataFetchStrategy ??= new DataFetchStrategy(3);
_renderFetchStrategy = renderFetchStrategy ?? new RenderFetchStrategy();
_minExtraTiles = minExtraTiles;
_maxExtraTiles = maxExtraTiles;
_tileFetchDispatcher = new TileFetchDispatcher(MemoryCache, _tileSource.Schema, fetchTileAsFeature ?? ToFeature, dataFetchStrategy);
_tileFetchDispatcher.DataChanged += TileFetchDispatcherOnDataChanged;
_tileFetchDispatcher.PropertyChanged += TileFetchDispatcherOnPropertyChanged;
}
public void TilesFetchedShouldNotBeFetchAgain()
{
// Arrange
var tileProvider = new CountingTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
using var cache = new MemoryCache <IFeature?>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, tileInfo => TileToFeature(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var level = 3;
var expectedTiles = 64;
var fetchInfo = new FetchInfo(tileSchema.Extent.ToMRect(), tileSchema.Resolutions[level].UnitsPerPixel);
// Act
fetchDispatcher.SetViewport(fetchInfo);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
var countAfterFirstTry = tileProvider.CountByTile.Keys.Count;
// do it again
fetchDispatcher.SetViewport(fetchInfo);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
// Assert
Assert.AreEqual(countAfterFirstTry, tileProvider.CountByTile.Values.Sum());
Assert.AreEqual(expectedTiles, tileProvider.CountByTile.Keys.Count);
Assert.AreEqual(expectedTiles, tileProvider.CountByTile.Values.Sum());
Assert.AreEqual(expectedTiles, tileProvider.TotalCount);
}
public void TileFetcherWithSometimesFailingFetchesShouldTryAgain()
{
// Arrange
var tileProvider = new SometimesFailingTileProvider();
var tileSchema = new GlobalSphericalMercator();
var tileSource = new TileSource(tileProvider, tileSchema);
using var cache = new MemoryCache <IFeature?>();
var fetchDispatcher = new TileFetchDispatcher(cache, tileSource.Schema, tileInfo => TileToFeature(tileSource, tileInfo));
var tileMachine = new FetchMachine(fetchDispatcher);
var level = 3;
var tilesInLevel = 64;
var fetchInfo = new FetchInfo(tileSchema.Extent.ToMRect(), tileSchema.Resolutions[level].UnitsPerPixel);
// Act
fetchDispatcher.SetViewport(fetchInfo);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
var tileCountAfterFirstBatch = tileProvider.TotalCount;
// Act again
fetchDispatcher.SetViewport(fetchInfo);
tileMachine.Start();
while (fetchDispatcher.Busy)
{
Thread.Sleep(1);
}
// Assert
Assert.GreaterOrEqual(tileProvider.TotalCount, tileCountAfterFirstBatch);
Assert.GreaterOrEqual(tileProvider.CountByTile.Values.Sum(), tilesInLevel);
}
