// If there are no inflight requests, sends the request right away.
// Otherwise puts it in a queue. When the current inflight request finishes,
// the next one will be sent.
// Inflight requests finish either when OnReply() is called or they time out.
public void Send(Resp msg, Action <TimestampedMsg <Req> > done)
{
DateTime deadline = DateTime.UtcNow + RequestTimeout;
_queue.Send(() => TrySend(msg, deadline, done), deadline, (bool success) =>
{
if (!success)
{
_log.Warn("Unable to send request to the exchange: timed out in Turnstile.");
done.Invoke(null);
}
});
}
// `OnMessage` may trigger before `done(true)`.
public void SendAsync(Out msg, DateTime deadline, Action <bool> done)
{
Func <bool> request = () =>
{
using (IWriter <Out> writer = TryLock())
{
if (writer == null)
{
return(false);
}
writer.Send(msg);
return(true);
}
};
_requestQueue.Send(request, deadline, done);
}
