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Use IDistributedCache on all platforms

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ClemensFischer 2024-02-03 20:53:32 +01:00
parent 16115413d8
commit c12e929fcc
39 changed files with 773 additions and 1686 deletions
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70
MapControl/Shared/TileImageLoader.cs
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@ -2,6 +2,7 @@
// Copyright © 2023 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)
using Microsoft.Extensions.Caching.Distributed;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
@ -39,9 +40,9 @@ namespace MapControl
}
/// <summary>
/// Maximum number of parallel tile loading tasks. The default value is 4.
/// An IDistributedCache implementation used to cache tile images.
/// </summary>
public static int MaxLoadTasks { get; set; } = 4;
public static IDistributedCache Cache { get; set; }
/// <summary>
/// Default expiration time for cached tile images. Used when no expiration time
@ -55,6 +56,12 @@ namespace MapControl
/// </summary>
public static TimeSpan MaxCacheExpiration { get; set; } = TimeSpan.FromDays(10);
/// <summary>
/// Maximum number of parallel tile loading tasks. The default value is 4.
/// </summary>
public static int MaxLoadTasks { get; set; } = 4;
private TileQueue pendingTiles;
/// <summary>
@ -125,34 +132,55 @@ namespace MapControl
if (uri != null)
{
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
{
extension = ".jpg";
}
var cacheKey = string.Format(CultureInfo.InvariantCulture,
"{0}/{1}/{2}/{3}{4}", cacheName, tile.ZoomLevel, tile.Column, tile.Row, extension);
return LoadCachedTileAsync(tile, uri, cacheKey);
return LoadCachedTileAsync(tile, uri, cacheName);
}
return Task.CompletedTask;
}
private static DateTime GetExpiration(TimeSpan? maxAge)
private static async Task LoadCachedTileAsync(Tile tile, Uri uri, string cacheName)
{
if (!maxAge.HasValue)
var extension = Path.GetExtension(uri.LocalPath);
if (string.IsNullOrEmpty(extension) || extension == ".jpeg")
{
maxAge = DefaultCacheExpiration;
}
else if (maxAge.Value > MaxCacheExpiration)
{
maxAge = MaxCacheExpiration;
extension = ".jpg";
}
return DateTime.UtcNow.Add(maxAge.Value);
var cacheKey = string.Format(CultureInfo.InvariantCulture,
"{0}/{1}/{2}/{3}{4}", cacheName, tile.ZoomLevel, tile.Column, tile.Row, extension);
var buffer = await Cache.GetAsync(cacheKey).ConfigureAwait(false);
if (buffer == null)
{
var response = await ImageLoader.GetHttpResponseAsync(uri).ConfigureAwait(false);
if (response != null) // download succeeded
{
buffer = response.Buffer ?? Array.Empty<byte>(); // may be empty when no tile available, but still be cached
var maxAge = response.MaxAge ?? DefaultCacheExpiration;
if (maxAge > MaxCacheExpiration)
{
maxAge = MaxCacheExpiration;
}
var cacheOptions = new DistributedCacheEntryOptions
{
AbsoluteExpiration = DateTimeOffset.UtcNow.Add(maxAge)
};
await Cache.SetAsync(cacheKey, buffer, cacheOptions).ConfigureAwait(false);
}
}
//else System.Diagnostics.Debug.WriteLine($"Cached: {cacheKey}");
if (buffer != null && buffer.Length > 0)
{
await LoadTileAsync(tile, () => ImageLoader.LoadImageAsync(buffer)).ConfigureAwait(false);
}
}
}
}