public static bool CreateProxy(SocketBase frontend,
SocketBase backend, SocketBase capture)
{
// The algorithm below assumes ratio of requests and replies processed
// under full load to be 1:1.
int more;
int rc;
Msg msg = new Msg();
msg.InitEmpty();
PollItem[] items = new PollItem[2];
items[0] = new PollItem(frontend, PollEvents.PollIn);
items[1] = new PollItem(backend, PollEvents.PollIn);
while (true)
{
// Wait while there are either requests or replies to process.
rc = ZMQ.Poll(items, -1);
if (rc < 0)
{
return(false);
}
// Process a request.
if ((items[0].ResultEvent & PollEvents.PollIn) == PollEvents.PollIn)
{
while (true)
{
try
{
frontend.Recv(ref msg, SendReceiveOptions.None);
}
catch (TerminatingException)
{
return(false);
}
more = frontend.GetSocketOption(ZmqSocketOptions.ReceiveMore);
if (more < 0)
{
return(false);
}
// Copy message to capture socket if any
if (capture != null)
{
Msg ctrl = new Msg();
ctrl.InitEmpty();
ctrl.Copy(ref msg);
capture.Send(ref ctrl, more > 0 ? SendReceiveOptions.SendMore : 0);
}
backend.Send(ref msg, more > 0 ? SendReceiveOptions.SendMore : 0);
if (more == 0)
{
break;
}
}
}
// Process a reply.
if ((items[1].ResultEvent & PollEvents.PollIn) == PollEvents.PollIn)
{
while (true)
{
try
{
backend.Recv(ref msg, SendReceiveOptions.None);
}
catch (TerminatingException)
{
return(false);
}
more = backend.GetSocketOption(ZmqSocketOptions.ReceiveMore);
if (more < 0)
{
return(false);
}
// Copy message to capture socket if any
if (capture != null)
{
Msg ctrl = new Msg();
ctrl.InitEmpty();
ctrl.Copy(ref msg);
capture.Send(ref ctrl, more > 0 ? SendReceiveOptions.SendMore : 0);
}
frontend.Send(ref msg, more > 0 ? SendReceiveOptions.SendMore : 0);
if (more == 0)
{
break;
}
}
}
}
}
