// The unsubscribe method handles both the subscripition
// unsubscribe and close operations.
private void unsubscribe(bool close)
{
string linbox = null;
string lAckInbox = null;
Connection lsc = null;
rwLock.EnterWriteLock();
try
{
if (sc == null)
{
throw new StanBadSubscriptionException();
}
lsc = sc;
sc = null;
linbox = inboxSub.Subject;
inboxSub.Unsubscribe();
inboxSub = null;
lAckInbox = ackInbox;
ackInbox = null;
}
catch
{
throw;
}
finally
{
rwLock.ExitWriteLock();
}
lsc.unsubscribe(subject, linbox, lAckInbox, close);
}
// in STAN, much of this code is in the connection module.
internal void subscribe(string subRequestSubject, string subject, string qgroup, EventHandler <StanMsgHandlerArgs> handler)
{
rwLock.EnterWriteLock();
try
{
this.handler += handler;
this.subject = subject;
if (sc == null)
{
throw new StanConnectionClosedException();
}
// Listen for actual messages.
inboxSub = sc.NATSConnection.SubscribeAsync(inbox, sc.processMsg);
SubscriptionRequest sr = new SubscriptionRequest();
sr.ClientID = sc.ClientID;
sr.Subject = subject;
sr.QGroup = (qgroup == null ? "" : qgroup);
sr.Inbox = inbox;
sr.MaxInFlight = options.MaxInflight;
sr.AckWaitInSecs = options.AckWait / 1000;
sr.StartPosition = options.startAt;
sr.DurableName = (options.DurableName == null ? "" : options.DurableName);
// Conditionals
switch (sr.StartPosition)
{
case StartPosition.TimeDeltaStart:
sr.StartTimeDelta = convertTimeSpan(
options.useStartTimeDelta ?
options.startTimeDelta :
(DateTime.UtcNow - options.startTime));
break;
case StartPosition.SequenceStart:
sr.StartSequence = options.startSequence;
break;
}
byte[] b = ProtocolSerializer.marshal(sr);
Msg m = sc.NATSConnection.Request(subRequestSubject, b, sc.opts.ConnectTimeout);
SubscriptionResponse r = new SubscriptionResponse();
ProtocolSerializer.unmarshal(m.Data, r);
if (string.IsNullOrWhiteSpace(r.Error) == false)
{
throw new StanException(r.Error);
}
ackInbox = r.AckInbox;
}
catch
{
if (inboxSub != null)
{
try
{
inboxSub.Unsubscribe();
}
catch (NATSTimeoutException)
{
// NOOP - this is unrecoverable.
}
}
throw;
}
finally
{
rwLock.ExitWriteLock();
}
}