public Maybe <Exception> Run()
{
try
{
if (State != OperationState.Idle)
{
return(null);
}
lock (operationLock)
{
if (State != OperationState.Idle)
{
return(null);
}
State = OperationState.Running;
if (!timestamp.HasValue)
{
timestamp = keyValueStorage.Find <long>($"{Name}Timestamp.json");
if (timestamp.Value == 0)
{
timestamp = defaultTimestampFunc.Invoke();
}
}
timestamp = enumration.Invoke(timestamp.Value);
keyValueStorage.Write($"{Name}Timestamp.json", timestamp.Value);
return(null);
}
}
catch (Exception e)
{
return(e);
}
finally
{
State = OperationState.Idle;
}
}