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/*
Copyright (c) 2007-2010 iMatix Corporation
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../../include/zmq.hpp"
#include "../../foreign/xmlParser/xmlParser.cpp"
class queue
{
public:
queue (zmq::socket_t& reply, zmq::socket_t& request) :
xrep (reply),
xreq (request)
{
items [0].socket = reply;
items [0].fd = 0;
items [0].events = ZMQ_POLLIN;
items [0].revents = 0;
items [1].socket = request;
items [1].fd = 0;
items [1].events = ZMQ_POLLIN;
items [1].revents = 0;
m_next_request_method = &queue::get_request;
m_next_response_method = &queue::get_response;
}
void run()
{
while (true) {
int rc = zmq::poll (&items [0], 2, -1);
if (rc < 0)
break;
next_request();
next_response();
}
}
private:
void next_request()
{
(this->*m_next_request_method) ();
}
void next_response()
{
(this->*m_next_response_method) ();
}
void get_request()
{
if (items [0].revents & ZMQ_POLLIN ) {
int rc = xrep.recv (&request_msg, ZMQ_NOBLOCK);
if (!rc)
return;
items [0].events &= ~ZMQ_POLLIN;
items [1].events |= ZMQ_POLLOUT;
m_next_request_method = &queue::send_request;
}
}
void send_request()
{
if (items [1].revents & ZMQ_POLLOUT) {
int rc = xreq.send (request_msg, ZMQ_NOBLOCK);
if (!rc) return;
items [1].events &= ~ZMQ_POLLOUT;
items [0].events |= ZMQ_POLLIN;
m_next_request_method = &queue::get_request;
}
}
void get_response()
{
if ( items [1].revents & ZMQ_POLLIN ) {
int rc = xreq.recv (&response_msg, ZMQ_NOBLOCK);
if (!rc)
return;
items [1].events &= ~ZMQ_POLLIN;
items [0].events |= ZMQ_POLLOUT;
m_next_response_method = &queue::send_response;
}
}
void send_response()
{
if (items [0].revents & ZMQ_POLLOUT) {
int rc = xrep.send (response_msg, ZMQ_NOBLOCK);
if (!rc)
return;
items [0].events &= ~ZMQ_POLLOUT;
items [1].events |= ZMQ_POLLIN;
m_next_response_method = &queue::get_response;
}
}
zmq::socket_t & xrep;
zmq::socket_t & xreq;
zmq_pollitem_t items [2];
zmq::message_t request_msg;
zmq::message_t response_msg;
typedef void (queue::*next_method) ();
next_method m_next_request_method;
next_method m_next_response_method;
queue (queue const &);
void operator = (queue const &);
};
int main (int argc, char *argv [])
{
if (argc != 2) {
fprintf (stderr, "usage: zmq_queue <config-file>\n");
return 1;
}
XMLNode root = XMLNode::parseFile (argv [1]);
if (root.isEmpty ()) {
fprintf (stderr, "configuration file not found or not an XML file\n");
return 1;
}
if (strcmp (root.getName (), "queue") != 0) {
fprintf (stderr, "root element in the configuration file should be "
"named 'queue'\n");
return 1;
}
XMLNode in_node = root.getChildNode ("in");
if (in_node.isEmpty ()) {
fprintf (stderr, "'in' node is missing in the configuration file\n");
return 1;
}
XMLNode out_node = root.getChildNode ("out");
if (out_node.isEmpty ()) {
fprintf (stderr, "'out' node is missing in the configuration file\n");
return 1;
}
// TODO: make the number of I/O threads configurable.
zmq::context_t ctx (1, 1);
zmq::socket_t in_socket (ctx, ZMQ_XREP);
zmq::socket_t out_socket (ctx, ZMQ_XREQ);
int n = 0;
while (true) {
XMLNode bind = in_node.getChildNode ("bind", n);
if (bind.isEmpty ())
break;
const char *addr = bind.getAttribute ("addr");
if (!addr) {
fprintf (stderr, "'bind' node is missing 'addr' attribute\n");
return 1;
}
in_socket.bind (addr);
n++;
}
n = 0;
while (true) {
XMLNode connect = in_node.getChildNode ("connect", n);
if (connect.isEmpty ())
break;
const char *addr = connect.getAttribute ("addr");
if (!addr) {
fprintf (stderr, "'connect' node is missing 'addr' attribute\n");
return 1;
}
in_socket.connect (addr);
n++;
}
n = 0;
while (true) {
XMLNode bind = out_node.getChildNode ("bind", n);
if (bind.isEmpty ())
break;
const char *addr = bind.getAttribute ("addr");
if (!addr) {
fprintf (stderr, "'bind' node is missing 'addr' attribute\n");
return 1;
}
out_socket.bind (addr);
n++;
}
n = 0;
while (true) {
XMLNode connect = out_node.getChildNode ("connect", n);
if (connect.isEmpty ())
break;
const char *addr = connect.getAttribute ("addr");
if (!addr) {
fprintf (stderr, "'connect' node is missing 'addr' attribute\n");
return 1;
}
out_socket.connect (addr);
n++;
}
queue q(in_socket, out_socket);
q.run();
return 0;
}
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