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Refactored TileImageLoader

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This commit is contained in:
Clemens 2021-11-22 23:07:07 +01:00
parent c78e72f735
commit d4e851e0f7
4 changed files with 30 additions and 24 deletions
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30
MapControl/Shared/TileImageLoader.cs
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@ -49,13 +49,20 @@ namespace MapControl
/// </summary>
public Task LoadTiles(IEnumerable<Tile> tiles, TileSource tileSource, string cacheName)
{
pendingTiles?.Clear(); // stop download from current stack
pendingTiles = new ConcurrentStack<Tile>(tiles.Where(tile => tile.Pending).Reverse());
pendingTiles?.Clear(); // stop processing the current queue
TileSource = tileSource;
if (tileSource == null || pendingTiles.IsEmpty)
if (tileSource == null)
{
return Task.CompletedTask;
}
pendingTiles = new ConcurrentStack<Tile>(tiles.Where(tile => tile.Pending).Reverse());
var numTasks = Math.Min(pendingTiles.Count, MaxLoadTasks);
if (numTasks < 1)
{
return Task.CompletedTask;
}
@ -65,14 +72,13 @@ namespace MapControl
cacheName = null; // no tile caching
}
var tasks = Enumerable
.Range(0, Math.Min(pendingTiles.Count, MaxLoadTasks))
.Select(_ => Task.Run(() => LoadPendingTilesAsync(pendingTiles, tileSource, cacheName)));
var tasks = Enumerable.Range(0, numTasks)
.Select(_ => Task.Run(() => LoadPendingTiles(pendingTiles, tileSource, cacheName)));
return Task.WhenAll(tasks);
}
private static async Task LoadPendingTilesAsync(ConcurrentStack<Tile> pendingTiles, TileSource tileSource, string cacheName)
private static async Task LoadPendingTiles(ConcurrentStack<Tile> pendingTiles, TileSource tileSource, string cacheName)
{
while (pendingTiles.TryPop(out var tile))
{
@ -80,7 +86,7 @@ namespace MapControl
try
{
await LoadTileAsync(tile, tileSource, cacheName).ConfigureAwait(false);
await LoadTile(tile, tileSource, cacheName).ConfigureAwait(false);
}
catch (Exception ex)
{
@ -89,11 +95,11 @@ namespace MapControl
}
}
private static Task LoadTileAsync(Tile tile, TileSource tileSource, string cacheName)
private static Task LoadTile(Tile tile, TileSource tileSource, string cacheName)
{
if (string.IsNullOrEmpty(cacheName))
{
return LoadTileAsync(tile, tileSource);
return LoadTile(tile, tileSource);
}
var uri = tileSource.GetUri(tile.XIndex, tile.Y, tile.ZoomLevel);
@ -113,7 +119,7 @@ namespace MapControl
var cacheKey = string.Format(CultureInfo.InvariantCulture,
"{0}/{1}/{2}/{3}{4}", cacheName, tile.ZoomLevel, tile.XIndex, tile.Y, extension);
return LoadCachedTileAsync(tile, uri, cacheKey);
return LoadCachedTile(tile, uri, cacheKey);
}
private static DateTime GetExpiration(TimeSpan? maxAge)