selected_recv.cpp

#include <proton/connection.hpp>
#include <proton/container.hpp>
#include <proton/message.hpp>
#include <proton/messaging_handler.hpp>
#include <proton/receiver_options.hpp>
#include <proton/source_options.hpp>

#include <iostream>


namespace {

    // Example custom function to configure an AMQP filter,
    // specifically an APACHE.ORG:SELECTOR
    // (http://www.amqp.org/specification/1.0/filters)

    void set_filter(proton::source_options &opts, const std::string& selector_str) {
        proton::source::filter_map map;
        proton::symbol filter_key("selector");
        proton::value filter_value;
        // The value is a specific AMQP "described type": binary string with symbolic descriptor
        proton::codec::encoder enc(filter_value);
        enc << proton::codec::start::described()
            << proton::symbol("apache.org:selector-filter:string")
            << selector_str
            << proton::codec::finish();
        // In our case, the map has this one element
        map.put(filter_key, filter_value);
        opts.filters(map);
    }
}


class selected_recv : public proton::messaging_handler {
    std::string conn_url_;
    std::string addr_;

  public:
    selected_recv(const std::string& u, const std::string& a) :
        conn_url_(u), addr_(a) {}

    void on_container_start(proton::container &c) override {
        proton::source_options opts;
        set_filter(opts, "colour = 'green'");
        proton::connection conn = c.connect(conn_url_);
        conn.open_receiver(addr_, proton::receiver_options().source(opts));
    }

    void on_message(proton::delivery &, proton::message &m) override {
        std::cout << m.body() << std::endl;
    }
};

int main(int argc, char **argv) {
    try {
        std::string conn_url = argc > 1 ? argv[1] : "//127.0.0.1:5672";
        std::string addr = argc > 2 ? argv[2] : "examples";

        selected_recv recv(conn_url, addr);
        proton::container(recv).run();

        return 0;
    } catch (const std::exception& e) {
        std::cerr << e.what() << std::endl;
    }

    return 1;
}