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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/ImageDownloadHelper.cs
+90 -39
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@@ -15,6 +15,7 @@ using System.Collections.Generic;
using System.IO.IsolatedStorage;
using System.IO;
using System.Windows.Media.Imaging;
using System.Diagnostics;
namespace WPImageCaching
{
@@ -35,7 +36,7 @@ namespace WPImageCaching
//Erstellen der Abfrage
var wc = (HttpWebRequest)HttpWebRequest.Create(url);
if (item.ImageID!=null)
if (item.ImageID != null)
{
//Prüfen, ob das Bild im Web immer noch aktuell ist
wc.Headers["If-None-Match"] = item.ImageID;
@@ -62,53 +63,103 @@ namespace WPImageCaching
//Bild wurde nicht geändert seit dem letzten Aufruf
if (response.StatusCode == HttpStatusCode.NotModified)
{
Deployment.Current.Dispatcher.BeginInvoke(() => transfer.Image.SetSource(IsolatedStorageFile.GetUserStoreForApplication().OpenFile(transfer.Item.LocalFilename, FileMode.Open)));
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
{
lock (ImageCache._lock)
{
using (IsolatedStorageFileStream fs =isf.OpenFile(transfer.Item.LocalFilename,FileMode.Open))
{
transfer.Image.SetSource(fs);
}
}
}
});
return;
}
//Hat das Bild eine neue ID?
if (response.Headers["ETag"] != null)
lock (ImageCache._lock)
{
transfer.Item.ImageID = response.Headers["ETag"];
}
else
{
transfer.Item.ImageID = null;
}
//Gibt es ein Ablaufdatum?
if (response.Headers["Expires"] != null)
{
transfer.Item.Expiration = DateTime.Parse(response.Headers["Expires"]);
}
else
{
transfer.Item.Expiration = DateTime.Now.AddDays(EXPIRATIONDAYS);
}
var responseStream = response.GetResponseStream();
//Schreiben der Bilddatei
using (var bw = new BinaryWriter(IsolatedStorageFile.GetUserStoreForApplication().CreateFile(transfer.Item.LocalFilename)))
{
byte[] b = new byte[4096];
int read = 0;
while ((read = responseStream.Read(b, 0, b.Length)) > 0)
string newKey = transfer.WebRequest.RequestUri.ToString();
if (ImageCache.imageCache.ContainsKey(newKey))
{
bw.Write(b, 0, read);
//Setzen des Bildes
Deployment.Current.Dispatcher.BeginInvoke(
() =>
{
using (IsolatedStorageFile ifs = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream fs = ifs.OpenFile(transfer.Item.LocalFilename, FileMode.Open))
{
transfer.Image.SetSource(fs);
}
}
});
return;
}
//Hat das Bild eine neue ID?
if (response.Headers["ETag"] != null)
{
transfer.Item.ImageID = response.Headers["ETag"];
}
else
{
transfer.Item.ImageID = null;
}
//Gibt es ein Ablaufdatum?
if (response.Headers["Expires"] != null)
{
transfer.Item.Expiration = DateTime.Parse(response.Headers["Expires"]);
}
else
{
transfer.Item.Expiration = DateTime.Now.AddDays(EXPIRATIONDAYS);
}
var responseStream = response.GetResponseStream();
//Schreiben der Bilddatei
using ( var bw = new BinaryWriter( IsolatedStorageFile.GetUserStoreForApplication().CreateFile(transfer.Item.LocalFilename)) )
{
byte[] b = new byte[4096];
int read = 0;
while ((read = responseStream.Read(b, 0, b.Length)) > 0)
{
bw.Write(b, 0, read);
}
bw.Flush();
bw.Close();
}
//Setzen des Bildes
Deployment.Current.Dispatcher.BeginInvoke(
() =>
{
using (IsolatedStorageFile ifs = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream fs = ifs.OpenFile( transfer.Item.LocalFilename,FileMode.Open))
{
transfer.Image.SetSource(fs);
}
}
});
//Hinzufügen der Bildinformationen
if (!ImageCache.imageCache.ContainsKey(newKey))
{
ImageCache.imageCache.Add(newKey, transfer.Item);
//Speichern der Bildinformationen
ImageCache.SaveCachedImageInfo();
}
bw.Flush();
bw.Close();
}
//Setzen des Bildes
Deployment.Current.Dispatcher.BeginInvoke(() => transfer.Image.SetSource(IsolatedStorageFile.GetUserStoreForApplication().OpenFile(transfer.Item.LocalFilename, FileMode.Open)));
//Hinzufügen der Bildinformationen
ImageCache.imageCache.Add(transfer.WebRequest.RequestUri.ToString(), transfer.Item);
//Speichern der Bildinformationen
ImageCache.SaveCachedImageInfo();
}
catch
catch (WebException webException)
{
}
catch (Exception ex)
{
//Nichts machen, da Bild nicht heruntergeladen werden konnte
Debug.WriteLine(ex.ToString());
}
}
//Erstellt einen eindeutigen Namen für das zu ladende Bild
@@ -118,7 +169,7 @@ namespace WPImageCaching
byte[] textToHash = Encoding.UTF8.GetBytes(url);
SHA1Managed sa = new SHA1Managed();
byte[] hash = sa.ComputeHash(textToHash);
return BitConverter.ToString(hash)+extension;
return BitConverter.ToString(hash) + extension;
}
}
//Hilfsklasse für den asynchronen Aufruf