/// <summary>
/// Initializes a new instance of the <c>QuoteDataProvider</c> class.
/// </summary>
public QuoteDataProvider()
{
m_runByState = Idle;
m_status = QuoteProviderStatus.Inactive;
m_listeners = new List <IQuoteDataListener>();
m_providerThread = null;
m_stopSignal = new AutoResetEvent(false);
}
/// <summary>
/// Changes the status of a quote data provider and notifies listeners.
/// </summary>
/// <param name="current">the status to change to.</param>
protected void ChangeStatus(QuoteProviderStatus current)
{
if (m_status == current)
{
return;
}
OnStatusChanged(new StatusChangedEventArgs(m_status, current));
m_status = current;
}
/// <summary>
/// Event handler for status change. It prints out notifications.
/// </summary>
/// <param name="e">the event args that contains the data of this event.</param>
public void OnStatusChanged(object sender, StatusChangedEventArgs e)
{
QuoteProviderStatus previous = e.Old;
QuoteProviderStatus current = e.New;
if (previous != QuoteProviderStatus.Inactive && current == QuoteProviderStatus.Open)
{
Console.WriteLine("Attempting to reopen resource...");
}
else if ((previous == QuoteProviderStatus.Open || previous == QuoteProviderStatus.Authenticate) && current == QuoteProviderStatus.Read)
{
Console.WriteLine("Resource opened successfully.\n");
}
}
/// <summary>
/// Tries to reconnect to the remote server, and gives up if trials exceeds a set limit.
/// </summary>
/// <returns>Time to sleep in milliseconds till executing next state.</returns>
private int RetryOrGiveup(QuoteProviderStatus previous)
{
if (++m_retryTimes >= 3)
{
OnErrorOccurred(new Exception("Max number of reconnection trials reached."), true);
m_runByState = Close;
return(0);
}
Close(); // first, close
m_runByState = Create; // then, re-create
return(1000 + m_rand.Next(2000));
}
/// <summary>
/// Initializes a new instance of the <c>StatusChangedEventArgs</c> class with the given previous and next status.
/// </summary>
/// <param name="old"></param>
/// <param name="current"></param>
public StatusChangedEventArgs(QuoteProviderStatus old, QuoteProviderStatus current)
{
m_old = old;
m_new = current;
}
