/// <summary>
/// Clears component state.
/// </summary>
private void Cleanup()
{
if (this._timeout == 0)
{
return;
}
long cutOffTime = DateTimeOffset.Now.ToUnixTimeMilliseconds() - _timeout;
// Cleanup obsolete entries
foreach (var prop in this._states.Keys)
{
StateEntry entry = this._states[prop];
// Remove obsolete entry
if (entry.GetLastUpdateTime() < cutOffTime)
{
_states.Remove(prop);
}
}
}
/// <summary>
/// Loads state from the store using its key.
/// If value is missing in the store it returns null.
/// </summary>
/// <param name="correlationId">(optional) transaction id to trace execution through call chain.</param>
/// <param name="key">a unique state key.</param>
/// <returns>the state value or null if value wasn't found.</returns>
public async Task <T> LoadAsync <T>(string correlationId, string key)
{
if (key == null)
{
throw new Exception("Key cannot be null");
}
// Cleanup the stored states
Cleanup();
// Get entry from the store
StateEntry entry = _states.ContainsKey(key) ? _states[key] : null;
// Store has nothing
if (entry == null)
{
return(default(T));
}
return(entry.GetValue());
}