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From Jonathan Robie <jonathan.ro...@redhat.com>
Subject Re: Getting started...
Date Sat, 01 May 2010 19:31:36 GMT
Here's a C++ program that uses the XML exchange. The only x-bindings 
argument that is really needed is the xquery, since the subject and the 
exchange can be specified as part of standard address syntax. I used a 
stringstream to make it easier to write a query and add it to a template 
string that creates an address containing that query.

I have a Python program that does the same, using the same address, but 
it runs into the bug Gordon reported in 
https://issues.apache.org/jira/browse/QPID-2551.

Hope this is helpful!

Jonathan

#include <qpid/messaging/Connection.h>
#include <qpid/messaging/Message.h>
#include <qpid/messaging/Receiver.h>
#include <qpid/messaging/Sender.h>
#include <qpid/messaging/Session.h>

#include <iostream>
#include <sstream>
using std::stringstream;

using namespace qpid::messaging;

int main(int argc, char** argv) {
   std::string broker = argc > 1 ? argv[1] : "localhost:5672";
   std::string query =
     "let $w := ./weather "
     "return $w/station = 'Raleigh-Durham International Airport (KRDU)' "
     "   and $w/temperature_f > 50"
     "   and $w/temperature_f - $w/dewpoint > 5"
     "   and $w/wind_speed_mph > 7"
     "   and $w/wind_speed_mph < 20";

   stringstream address;

   address << "xml/weather; {"
     " link: { "
     "  x-bindings: [{ arguments: { xquery:\"" << query << "\"} }] "
     " } "
     "}";

   Connection connection(broker);
   try {
     connection.open();
     Session session = connection.createSession();

     Receiver receiver = session.createReceiver(address.str());

     Message message;
     message.setContent(
                "<weather>"
                "<station>Raleigh-Durham International Airport 
(KRDU)</station>"
                "<wind_speed_mph>16</wind_speed_mph>"
                "<temperature_f>70</temperature_f>"
                "<dewpoint>35</dewpoint>"
                "</weather>");
     Sender sender = session.createSender("xml/weather");
     sender.send(message);

     Message response = receiver.fetch();

     std::cout << response.getContent() << std::endl;

     connection.close();
     return 0;
   } catch(const std::exception& error) {
     std::cerr << error.what() << std::endl;
     connection.close();
     return 1;
   }
}


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