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Unified ImageFileCache implementations

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This commit is contained in:
Clemens 2021-06-30 17:56:02 +02:00
parent 8cb20f0544
commit f9347edf19
5 changed files with 92 additions and 118 deletions
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36
MapControl/WPF/TileImageLoader.WPF.cs
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@ -2,12 +2,11 @@
// © 2021 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)
using MapControl.Caching;
using System;
using System.IO;
using System.Runtime.Caching;
using System.Threading.Tasks;
using System.Windows.Media;
using MapControl.Caching;
namespace MapControl
{
@ -39,7 +38,7 @@ namespace MapControl
private static async Task LoadCachedTileAsync(Tile tile, Uri uri, string cacheKey)
{
var cacheItem = await GetCacheAsync(cacheKey).ConfigureAwait(false);
var cacheItem = Cache.Get(cacheKey) as ImageCacheItem;
var buffer = cacheItem?.Buffer;
if (cacheItem == null || cacheItem.Expiration < DateTime.UtcNow)
@ -48,9 +47,15 @@ namespace MapControl
if (response != null) // download succeeded
{
buffer = response.Buffer; // may be null or empty when no tile available, but still be cached
buffer = response.Buffer;
await SetCacheAsync(cacheKey, buffer, GetExpiration(response.MaxAge)).ConfigureAwait(false);
cacheItem = new ImageCacheItem
{
Buffer = buffer, // may be null or empty when no tile available, but still be cached
Expiration = GetExpiration(response.MaxAge)
};
Cache.Set(cacheKey, cacheItem, new CacheItemPolicy { AbsoluteExpiration = cacheItem.Expiration });
}
}
@ -68,26 +73,5 @@ namespace MapControl
await tile.Image.Dispatcher.InvokeAsync(() => tile.SetImage(image));
}
private static Task<ImageCacheItem> GetCacheAsync(string cacheKey)
{
return Task.Run(() => Cache.Get(cacheKey) as ImageCacheItem);
}
private static Task SetCacheAsync(string cacheKey, byte[] buffer, DateTime expiration)
{
var imageCacheItem = new ImageCacheItem
{
Buffer = buffer,
Expiration = expiration
};
var cacheItemPolicy = new CacheItemPolicy
{
AbsoluteExpiration = expiration
};
return Task.Run(() => Cache.Set(cacheKey, imageCacheItem, cacheItemPolicy));
}
}
}