private void LoadCacheItems()
{
var fileNames = _fs.GetFileNames(FileSystemCache.CacheDirectory, "*.dat");
foreach (var file in fileNames)
{
var fqfn = FileSystemCache.GetFullyQualifiedFileName(file);
var info = new FileCacheItemInfo(file) { LastUsed = _fs.GetLastAccessTime(fqfn), FullyQualifiedFileName = fqfn, Size = _fs.GetFileSize(fqfn) };
_cacheItems.Add(info);
}
}
public T Get <T>(string key) where T : class
{
//If the file doesn't exist then the item has expired and been deleted so get out
var fileName = GetFilePathFromKey(key);
if (fileName == null || !FileSystem.FileExists(fileName))
{
return(default(T));
}
T obj;
//If the item has expired, get out
var cachInfo = new FileCacheItemInfo(fileName);
if (cachInfo.IsExpired)
{
return(default(T));
}
//If the item exists in the memory cache then return it
obj = MemoryCache.Get <T>(key);
if (obj != default(T))
{
return(obj);
}
//The file is not yet in the memory cache so lets deserialize,
//store it the memory cache then return it
var cacheItemInfo = new FileCacheItemInfo(Path.GetFileName(fileName));
//TODO: Add error handling in case we can't open the file for some reason
try
{
using (var fs = FileSystem.CreateFileStream(fileName, FileMode.Open))
{
var serializer = new DataContractJsonSerializer(typeof(T));
obj = (T)serializer.ReadObject(fs);
}
}
catch (Exception)
{
//For now, if reading from disk fails, then we'll just ignore the exception
return(obj);
}
MemoryCache.Add(obj, key, cacheItemInfo.Expiration);
return(obj);
}
private void LoadCacheItems()
{
var fileNames = _fs.GetFileNames(FileSystemCache.CacheDirectory, "*.dat");
foreach (var file in fileNames)
{
var fqfn = FileSystemCache.GetFullyQualifiedFileName(file);
var info = new FileCacheItemInfo(file)
{
LastUsed = _fs.GetLastAccessTime(fqfn), FullyQualifiedFileName = fqfn, Size = _fs.GetFileSize(fqfn)
};
_cacheItems.Add(info);
}
}
