public byte[] GetOrExpire(string key, TimeSpan s)
{
var ticks = DateTime.UtcNow.Subtract(s).Ticks;
var keybytes = Encoding.UTF8.GetBytes(key);
uint hash = FNV64.Compute(keybytes);
uint _pos;
if (!GetKeySlot(hash, keybytes, out _pos))
{
return(null);
}
var i = (int)_pos;
if (_index.GetDataCreateTime(i) < ticks)
{
var key_sector = _index.GetKeySector(i);
_storage.Delete(key_sector);
_index.SetKeySector(i, 0);
_storage.Delete(_index.GetDataSector(i));
_index.used -= 1;
_index.Flush();
return(null);
}
else
{
return(_storage.Retrieve(_index.GetDataSector(i)));
}
}
public byte[] Get(string key)
{
var keybytes = Encoding.UTF8.GetBytes(key);
uint hash = FNV64.Compute(keybytes);
uint _pos;
if (!GetKeySlot(hash, keybytes, out _pos))
{
return(null);
}
int pos = (int)_pos;
byte[] result = _storage.Retrieve(_index.GetDataSector(pos));
return(result);
}
public void Remove(string key)
{
var keybytes = Encoding.UTF8.GetBytes(key);
uint hash = FNV64.Compute(keybytes);
uint pos;
if (!GetKeySlot(hash, keybytes, out pos))
{
return;
}
int _pos = (int)pos;
_storage.Delete(_index.GetKeySector(_pos));
_index.SetKeySector(_pos, 0);
_storage.Delete(_index.GetDataSector(_pos));
_index.used -= 1;
_index.Flush();
}
/// <summary>
/// store a key in collection
/// </summary>
/// <param name="key">key</param>
/// <param name="data">value</param>
/// <returns></returns>
public bool Put(string key, byte[] data)
{
var keybytes = Encoding.UTF8.GetBytes(key);
uint hash = FNV64.Compute(keybytes);
if ((double)_index.fill / (double)_index.mask > 0.65)
{
_index.Grow();
}
uint _pos;
if (GetKeySlot(hash, keybytes, out _pos))
{
// update existing slot
int pos = (int)_pos;
_storage.Delete(_index.GetDataSector(pos));
_index.SetDataCreateTime(pos, DateTime.UtcNow.Ticks);
_index.SetDataSector(pos, _storage.Store(data));
}
else
{
int pos = (int)_pos;
_index.SetHash(pos, hash);
_index.SetKeySector(pos, _storage.Store(keybytes));
_index.SetDataCreateTime(pos, DateTime.UtcNow.Ticks);
_index.SetDataSector(pos, _storage.Store(data));
_index.fill += 1;
_index.used += 1;
}
_index.Flush();
return(true);
}
