protected void TWSCallbackClosed(string wskey)
{
lock (m_InFlight) {
// releasing the existing tiingo websock callback handler enables the
// BackgroundWork method to create another one
m_InFlight.Remove(wskey);
m_TWSCallback = null;
}
}
public void BackgroundWork( )
{
// We're running on the background thread. Loop until we're told to exit...
Logr.Log(String.Format("~A BackgroundWork thread started"));
// Main loop for worker thread. It will briefly hold the m_InFlight lock when
// it removes entries, and also the m_InputQueue lock in GetWork( ) as it
// removes entries. DoQuandlQuery( ) will grab the cache lock when it's
// adding cache entries. Obviously, no lock should be held permanently! JOS 2015-04-31
while (true)
{
// Wait for a signal from the other thread to say there's some work.
m_Event.WaitOne( );
Dictionary <string, string> work = GetWork( );
while (work != null)
{
if (work["type"] == "stop")
{
// exit req from excel thread
Logr.Log(String.Format("~A BackgroundWork thread exiting"));
return;
}
string fkey = String.Format("{0}.{1}", work["type"], work["key"]);
Logr.Log(String.Format("~A BackgroundWork new request fkey({0})", fkey));
if (work["type"] == "quandl")
{
// run query synchronously here on background worker thread
bool ok = DoQuandlQuery(work);
// query done, so remove key from inflight, which will permit
// the query to be resubmitted
lock (m_InFlight) {
m_InFlight.Remove(fkey);
}
}
else if (work["type"] == "tiingo")
{
// run query synchronously here on background worker thread
bool ok = DoTiingoQuery(work);
// query done, so remove key from inflight, which will permit
// the query to be resubmitted
lock (m_InFlight) {
m_InFlight.Remove(fkey);
}
}
else if (work["type"] == "websock")
{
WSCallback wscb = new WSCallback(work, this.WSCallbackClosed);
// We don't want to remove the inflight key here as there will be
// async callbacks to WSCallback on pool threads when updates
// arrive on the SS websock. So we leave the key in place to
// prevent AddRequest, which is on the Excel thread, creating
// a request for a new WSCallback.
lock (m_InFlight) {
m_WSCallbacks.Add(fkey, wscb);
}
}
else if (work["type"] == "twebsock")
{
// We don't want to remove the inflight key here as there will be
// async callbacks to TWSCallback on pool threads when updates
// arrive on the tiingo websock. So we leave the key in place to
// prevent AddRequest, which is on the Excel thread, creating
// a request for a new TWSCallback.
lock (m_InFlight) {
if (m_TWSCallback == null)
{
m_TWSCallback = new TWSCallback(work, this.TWSCallbackClosed);
if (m_PendingTiingoSubs.Count > 0)
{
m_TWSCallback.AddSubscriptions(m_PendingTiingoSubs);
m_PendingTiingoSubs.Clear();
}
}
}
}
else if (work["type"] == "s2sub")
{
if (work["subcache"] == "twebsock")
{
// New subscription to a tiingo websock. If the TWSCallback
// doesn't exist yet cache it, but if it does pass it through
lock (m_InFlight) {
m_PendingTiingoSubs.Add(work);
if (m_TWSCallback != null)
{
m_TWSCallback.AddSubscriptions(m_PendingTiingoSubs);
m_PendingTiingoSubs.Clear();
}
}
}
}
work = GetWork( );
}
// We've exhausted the queued work, so reset the event so that we wait in the
// WaitOne( ) invocation above until another thread signals that there's some
// more work.
m_Event.Reset( );
}
}
