public IObservable <AccountData> GetPortfolioSnapshot(string accountName, Action <bool> enable)
{
lock (_accountUpdatesGate)
{
if (_portfolioSubj != null && _portfolioLiveSubj == _portfolioSubj) // pre-empt live update
{
StopAccountUpdates(_enableLiveAccountUpdates);
}
if (_activeSnapshotAccountName == null) // no update in progress, start a new one
{
_portfolioSubj = new ReplaySubject <AccountData>();
_activeSnapshotAccountName = accountName;
_enableSnapshotAccountUpdates = enable;
enable(true); // start
return(_portfolioSubj.MergeErrors(Errors));
}
else if (_activeSnapshotAccountName == accountName) // reuse the one in progress
{
return(_portfolioSubj.MergeErrors(Errors));
}
else // queue request
{
ISubject <AccountData> newPortfolioSubj = new ReplaySubject <AccountData>();
_accountSnapshotRequestsQueue.Enqueue(Tuple.Create(newPortfolioSubj, accountName, enable));
return(newPortfolioSubj.MergeErrors(Errors));
}
}
}