/// <summary>
/// Removing oldest cache file (file, which last access time is smaller)
/// </summary>
private bool RemoveOldestCacheFile()
{
if (_lastAccessTimeDictionary.Count == 0)
{
return(false);
}
var oldestCacheFilePath = _lastAccessTimeDictionary.Aggregate((pair1, pair2) => (pair1.Value < pair2.Value)? pair1 : pair2).Key;
if (String.IsNullOrEmpty(oldestCacheFilePath))
{
return(false);
}
try
{
long fileSizeInBytes;
using (var file = ISF.OpenFile(oldestCacheFilePath, FileMode.Open, FileAccess.Read))
{
fileSizeInBytes = file.Length;
}
try
{
ISF.DeleteFile(oldestCacheFilePath);
_lastAccessTimeDictionary.Remove(oldestCacheFilePath);
CurrentCacheSizeInBytes -= fileSizeInBytes; // Updating current cache size
JetImageLoader.Log("[delete] cache file " + oldestCacheFilePath);
return(true);
}
catch
{
JetImageLoader.Log("[error] can not delete oldest cache file: " + oldestCacheFilePath);
}
}
catch
{
JetImageLoader.Log("[error] can not get olders cache's file size: " + oldestCacheFilePath);
}
return(false);
}