simple_recv.cpp

Subscribes to the 'examples' node on an intermediary accessible on 127.0.0.1:5672.

Subscribes to the 'examples' node on an intermediary accessible on 127.0.0.1:5672. Simply prints out the body of received messages.

/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */
 
#include "options.hpp"
 
#include <proton/connection.hpp>
#include <proton/connection_options.hpp>
#include <proton/container.hpp>
#include <proton/delivery.hpp>
#include <proton/link.hpp>
#include <proton/message.hpp>
#include <proton/message_id.hpp>
#include <proton/messaging_handler.hpp>
#include <proton/value.hpp>
 
#include <iostream>
#include <map>
 
 
class simple_recv : public proton::messaging_handler {
  private:
    std::string url;
    std::string user;
    std::string password;
    proton::receiver receiver;
    int expected;
    int received;
 
  public:
    simple_recv(const std::string &s, const std::string &u, const std::string &p, int c) :
        url(s), user(u), password(p), expected(c), received(0) {}
 
    void on_container_start(proton::container &c) override {
        proton::connection_options co;
        if (!user.empty()) co.user(user);
        if (!password.empty()) co.password(password);
        receiver = c.open_receiver(url, co);
    }
 
    void on_message(proton::delivery &d, proton::message &msg) override {
        if (!msg.id().empty() && proton::coerce<int>(msg.id()) < received) {
            return; // Ignore if no id or duplicate
        }
 
        if (expected == 0 || received < expected) {
            std::cout << msg.body() << std::endl;
            received++;
 
            if (received == expected) {
                d.receiver().close();
                d.connection().close();
            }
        }
    }
};
 
int main(int argc, char **argv) {
    std::string address("127.0.0.1:5672/examples");
    std::string user;
    std::string password;
    int message_count = 100;
    example::options opts(argc, argv);
 
    opts.add_value(address, 'a', "address", "connect to and receive from URL", "URL");
    opts.add_value(message_count, 'm', "messages", "receive COUNT messages", "COUNT");
    opts.add_value(user, 'u', "user", "authenticate as USER", "USER");
    opts.add_value(password, 'p', "password", "authenticate with PASSWORD", "PASSWORD");
 
 
    try {
        opts.parse();
 
        simple_recv recv(address, user, password, message_count);
        proton::container(recv).run();
 
        return 0;
    } catch (const example::bad_option& e) {
        std::cout << opts << std::endl << e.what() << std::endl;
    } catch (const std::exception& e) {
        std::cerr << e.what() << std::endl;
    }
 
    return 1;
}