/// <summary>
/// Hub method. Called when client requests to pull his/her history message.
/// </summary>
/// <param name="username">The username of the client</param>
/// <param name="untilTime">The earliest message stored on the client. Any message
/// after the untilTime will not be pulled</param>
/// <returns></returns>
public async Task OnPullHistoryMessagesReceived(string username, long untilTime)
{
_logger.LogInformation(string.Format("OnPullHistoryMessageReceived username: {0}; until: {1}", username, untilTime));
// Convert java base client time to C# DateTime object
var untilDateTime = JavaLongToCSharpDateTime(untilTime);
// Fetch history from message storage. After done, send them back with a callback method SendHistoryMessages.
List <Message> historyMessages = new List <Message>();
bool success = await _messageStorage.TryFetchHistoryMessageAsync(username, untilDateTime, historyMessages);
// Only send messages out when storage was a success
if (success)
{
await SendHistoryMessages(historyMessages);
}
}
