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change struct to class to use reference type

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弘韬 张 2020-11-11 10:56:53 +08:00
parent bf271b9da7
commit 55fb5536bd
1 changed files with 22 additions and 9 deletions
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31
Flow.Launcher.Infrastructure/Image/ImageCache.cs
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@ -8,17 +8,30 @@ using System.Windows.Media;
namespace Flow.Launcher.Infrastructure.Image
{
[Serializable]
public class ImageUsage
{
public int usage;
public ImageSource imageSource;
public ImageUsage(int usage, ImageSource image)
{
this.usage = usage;
imageSource = image;
}
}
public class ImageCache
{
private const int MaxCached = 50;
public ConcurrentDictionary<string, (int usage, ImageSource imageSource)> Data { get; private set; } = new ConcurrentDictionary<string, (int, ImageSource)>();
public ConcurrentDictionary<string, ImageUsage> Data { get; private set; } = new ConcurrentDictionary<string, ImageUsage>();
private const int permissibleFactor = 2;
public void Initialization(Dictionary<string, int> usage)
{
foreach (var key in usage.Keys)
{
Data[key] = (usage[key], null);
Data[key] = new ImageUsage(usage[key], null);
}
}
@ -35,12 +48,12 @@ namespace Flow.Launcher.Infrastructure.Image
}
set
{
Data.AddOrUpdate(path, (1, value), (k, v) =>
{
v.imageSource = value;
v.usage++;
return v;
});
Data.AddOrUpdate(path, new ImageUsage(0, value), (k, v) =>
{
v.imageSource = value;
v.usage++;
return v;
});
// To prevent the dictionary from drastically increasing in size by caching images, the dictionary size is not allowed to grow more than the permissibleFactor * maxCached size
// This is done so that we don't constantly perform this resizing operation and also maintain the image cache size at the same time
@ -48,7 +61,7 @@ namespace Flow.Launcher.Infrastructure.Image
{
// To delete the images from the data dictionary based on the resizing of the Usage Dictionary.
foreach (var key in Data.OrderBy(x => x.Value.usage).Take(Data.Count - MaxCached).Select(x => x.Key))
{
if (!(key.Equals(Constant.ErrorIcon) || key.Equals(Constant.DefaultIcon)))