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friends caching

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small improvements
This commit is contained in:
Claudiu Farcas
2011-04-09 01:47:50 +03:00
parent 9c59a73113
commit a297460f37
11 changed files with 323 additions and 122 deletions
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main/Libs/WPImageCaching/ImageCache.cs
+94 -17
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@@ -13,6 +13,7 @@ using System.Windows.Media.Imaging;
using System.IO;
using System.IO.IsolatedStorage;
using System.Runtime.Serialization;
using Microsoft.Phone;
namespace WPImageCaching
{
@@ -20,8 +21,66 @@ namespace WPImageCaching
{
private const string IMAGECACHEFILE = "imagecachefile.nfo";
internal static Dictionary<string, ImageCacheItem> imageCache;
internal static object _lock = new object();
public static BitmapImage GetImage(string url)
{
BitmapImage image = new BitmapImage();
if (Environment.OSVersion.Platform == PlatformID.Win32NT)
{
//Wenn im Designmodus von Blend oder Visual Studio
image.UriSource = new Uri(url);
return image;
}
if (imageCache == null)
{
LoadCachedImageInfo();
}
//Prüfen auf ein vorhandenes gespeichertes Bild
if (imageCache.ContainsKey(url))
{
//Prüfen auf Gültigkeit des Bildes
if (DateTime.Compare(DateTime.Now, imageCache[url].Expiration) >= 0)
{
ImageDownloadHelper.DownloadImage(url, image, imageCache[url]);
}
else
{
if (IsolatedStorageFile.GetUserStoreForApplication().FileExists(imageCache[url].LocalFilename))
{
//Bild ist noch gültig
using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
{
lock (_lock)
{
using (
IsolatedStorageFileStream fs = isf.OpenFile(imageCache[url].LocalFilename,
FileMode.Open))
{
image.SetSource(fs);
return image;
}
}
}
}
else
{
ImageDownloadHelper.DownloadImage(url, image, imageCache[url]);
}
}
}
else
{
//Bild noch nicht gespeichert
ImageCacheItem item = new ImageCacheItem();
ImageDownloadHelper.DownloadImage(url, image, item);
}
return image;
}
public static BitmapImage GetImage(BitmapImage image)
{
string url = image.UriSource.ToString();
@@ -65,31 +124,49 @@ namespace WPImageCaching
//Laden der Bildinformationen
private static void LoadCachedImageInfo()
{
if (IsolatedStorageFile.GetUserStoreForApplication().FileExists(IMAGECACHEFILE))
using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
{
IsolatedStorageFileStream fs =
IsolatedStorageFile.GetUserStoreForApplication().OpenFile(IMAGECACHEFILE,FileMode.Open);
lock (_lock)
{
if (isf.FileExists(IMAGECACHEFILE))
{
using (IsolatedStorageFileStream fs = isf.OpenFile(IMAGECACHEFILE, FileMode.Open))
{
using (StreamReader sr = new StreamReader(fs))
{
string serObj = sr.ReadToEnd();
imageCache = SerializationHelper.Deserialize<Dictionary<string, ImageCacheItem>>(serObj);
}
DataContractSerializer dcs = new DataContractSerializer(typeof(Dictionary<string, ImageCacheItem>));
imageCache = (Dictionary<string, ImageCacheItem>)dcs.ReadObject(fs);
fs.Close();
}
else
{
imageCache = new Dictionary<string, ImageCacheItem>();
}
}
}
if (imageCache == null)
{
imageCache = new Dictionary<string, ImageCacheItem>();
}
}
}
//Speichern der Bildinformationen
internal static void SaveCachedImageInfo()
{
IsolatedStorageFileStream fs =
IsolatedStorageFile.GetUserStoreForApplication().CreateFile(IMAGECACHEFILE);
DataContractSerializer dcs = new DataContractSerializer(typeof(Dictionary<string, ImageCacheItem>));
dcs.WriteObject(fs, imageCache);
fs.Flush();
fs.Close();
using (IsolatedStorageFile sf = IsolatedStorageFile.GetUserStoreForApplication())
{
lock (_lock)
{
if (sf.FileExists(IMAGECACHEFILE))
sf.DeleteFile(IMAGECACHEFILE);
using (IsolatedStorageFileStream fs = sf.CreateFile(IMAGECACHEFILE))
{
using (StreamWriter sw = new StreamWriter(fs))
{
string serObj = SerializationHelper.Serialize(imageCache);
sw.Write(serObj);
}
}
}
}
}
}
}