/// <summary>
/// Kills Index: Removes all files in cache folder and all entries in this cache index.
/// </summary>
public void KillIndex()
{
try
{
lock (syncLock)
{
// Remove all files and directories in cache folder subdirectories.
var path = CachePath.AppendPath(BaseUriPath);
foreach (var d in Device.File.GetDirectoryNames(path))
{
Device.File.DeleteDirectory(d, true);
}
// remove all files in cache folder except for Serializefile
foreach (var f in Device.File.GetFileNames(path).Where(f => !f.Equals(SerializeFile)))
{
Device.File.Delete(f);
}
// remove all entries in cache index
Clear();
// Serialize the CacheIndex
SerializeCacheIndex(this);
}
}
catch (Exception exc)
{
Device.Log.Error("CacheIndex.KillIndex() encountered an exception", exc);
}
}
/// <summary>
/// Gets the cache path.
/// </summary>
/// <param name="cacheIndexItem">The cache index item.</param>
/// <returns></returns>
public string GetCachePath(CacheIndexItem cacheIndexItem)
{
var chars = new[] { '<', '>', ':', '"', '|', '?', '*' };
string uriString = CachePath.AppendPath(BaseUriPath).AppendPath(new string(cacheIndexItem.ID.ToCharArray().Select(c => chars.Contains(c) ? '_' : c).ToArray()));
Uri uri = new Uri(uriString, UriKind.RelativeOrAbsolute);
// Azure has filepath directory length limitations, so enforcing limit of 248 for cache.
if (!uri.IsAbsoluteUri)
{
return(uriString);
}
#if !AZURE
return(uri.LocalPath);
#else
if (uri.LocalPath.Length <= 247)
{
return(uri.LocalPath);
}
// To-Do: find better way to manage Azure cache folder, this is under a spell.
// shrink file name to first 227 and last 20, causes cache file name collisions for BestSellers, due to long api key parameter.
return(uri.LocalPath.Remove(227) + "~" + uri.LocalPath.Substring(uri.LocalPath.Length - 20));
#endif
}
/// <summary>
/// Weeds Index: Remove all files in cache folder and subfolders that do not
/// have corresponding <see cref="CacheIndexItem"/> entries in this cache index.
/// </summary>
public void WeedIndex()
{
try
{
lock (syncLock)
{
// get list of files in cache folder.
foreach (var f in GetFilesRecursive(CachePath.AppendPath(BaseUriPath))
.Where(f => !f.Equals(SerializeFile))
.Except(this.Select(i => GetCachePath(i))))
{
Device.File.Delete(f);
}
}
}
catch (Exception exc)
{
Device.Log.Error("CacheIndex.WeedIndex() encountered an exception", exc);
}
}
