public override void Delete(CacheItemInfo item)
{
CacheItemInfo cachedItem;
lock (_cache)
{
if (_cache.TryGetValue(item.UniqueName, out cachedItem) && Object.Equals(item, cachedItem))
{
_cache.Remove(item.UniqueName);
}
}
var fi = new FileItem(item);
var fileName = fi.FileName;
File.Delete(fileName);
}
/// <summary> /// Delete's the given item from the store. /// </summary> /// <param name="item">The item to delete</param> public abstract void Delete(CacheItemInfo item);
/// <summary> /// Write the item's data to the store. /// </summary> /// <param name="info"></param> /// <param name="data"></param> public abstract void Write(CacheItemInfo info, byte[] data);
/// <summary> /// Read the data for the given item. /// </summary> /// <param name="item">The info describing the item to read</param> /// <returns>The data in the store for the specified item.</returns> public abstract byte[] Read(CacheItemInfo item);
/// <summary>
/// Look in the store for a recent entry that we can load from.
/// </summary>
/// <returns></returns>
private bool FindCacheItem()
{
lock (this)
{
if (_cacheItemInfo == null && !_thereIsNoCacheItem)
{
_cacheItemInfo = DataManager.StoreProvider.GetLastestExpiringItem(CacheEntry.UniqueName);
}
if (_cacheItemInfo == null)
{
// flat failure.
if (!_thereIsNoCacheItem)
{
_thereIsNoCacheItem = true;
Debug.WriteLine("No cache found for {0} (ID={1})", CacheEntry.ObjectType, CacheEntry.LoadContext.Identity);
}
return false;
}
return true;
}
}
/// <summary>
/// Save the specified value back to the disk.
/// </summary>
/// <param name="uniqueName"></param>
/// <param name="data"></param>
/// <param name="updatedTime"></param>
/// <param name="expirationTime"></param>
/// <param name="isOptimized"></param>
public void Save(string uniqueName, byte[] data, DateTime updatedTime, DateTime expirationTime, bool isOptimized)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
_cacheItemInfo = new CacheItemInfo(uniqueName, updatedTime, expirationTime);
_cacheItemInfo.IsOptimized = isOptimized;
Data = null;
LoadState = DataLoadState.None;
Debug.WriteLine("Writing cache for {0} (ID={3}), IsOptimized={1}, Will expire {2}", CacheEntry.ObjectType.Name, _cacheItemInfo.IsOptimized, _cacheItemInfo.ExpirationTime, CacheEntry.LoadContext.Identity.ToString());
DataManager.StoreProvider.Write(_cacheItemInfo, data);
}
public override void Reset()
{
base.Reset();
_cacheItemInfo = null;
_thereIsNoCacheItem = false;
}
private static string ToFileName(CacheItemInfo item)
{
string name = EncodePathName(item.UniqueName);
name = String.Format("{1}{0}{2}{0}{3}{0}{4}", FileNameSeparator, name, item.IsOptimized, item.ExpirationTime.Ticks, item.UpdatedTime.Ticks);
name = Path.Combine(DirectoryHash(item.UniqueName), name);
return name;
}
public static CacheItemInfo FromFileName(string fileName)
{
if (!fileName.StartsWith(CacheDirectoryPrefix))
{
fileName = Path.GetFileName(fileName);
string[] parts = fileName
.Split(FileNameSeparator);
if (parts.Length == 4)
{
string uniqueKey = DecodePathName(parts[0]);
var item = new CacheItemInfo(uniqueKey)
{
ExpirationTime = new DateTime(Int64.Parse(parts[2])),
UpdatedTime = new DateTime(Int64.Parse(parts[3])),
IsOptimized = Boolean.Parse(parts[1])
};
return item;
}
}
return null;
}
public FileItem(CacheItemInfo item)
{
Item = item;
}
public override void Write(CacheItemInfo info, byte[] data)
{
var fi = new FileItem(info);
PriorityQueue.AddStorageWorkItem(async () =>
{
FileItem.EnsurePath(fi.FileName);
File.WriteAllBytes(fi.FileName, data);
});
}
public override byte[] Read(CacheItemInfo item)
{
var fi = new FileItem(item);
byte[] bytes = null;
bool fileExists = File.Exists(fi.FileName);
if (!fileExists)
return null;
using (Stream stream = File.Open(fi.FileName,FileMode.Open))
{
bytes = new byte[stream.Length];
stream.Read(bytes, 0, (int)stream.Length);
}
return bytes;
}
