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client.cpp

The client part of a request-response example.

The client part of a request-response example. Sends requests and prints out responses. Requires an intermediary that supports the AMQP 1.0 dynamic nodes on which the responses are received. The requests are sent through the 'examples' node.

/*
*
* 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/container.hpp>
#include <proton/delivery.hpp>
#include <proton/message.hpp>
#include <proton/messaging_handler.hpp>
#include <proton/receiver_options.hpp>
#include <proton/source_options.hpp>
#include <proton/tracker.hpp>
#include <iostream>
#include <vector>
using proton::receiver_options;
using proton::source_options;
class client : public proton::messaging_handler {
private:
std::string url;
std::vector<std::string> requests;
proton::sender sender;
proton::receiver receiver;
public:
client(const std::string &u, const std::vector<std::string>& r) : url(u), requests(r) {}
void on_container_start(proton::container &c) override {
sender = c.open_sender(url);
// Create a receiver requesting a dynamically created queue
// for the message source.
receiver_options opts = receiver_options().source(source_options().dynamic(true));
receiver = sender.connection().open_receiver("", opts);
}
void send_request() {
proton::message req;
req.body(requests.front());
req.reply_to(receiver.source().address());
sender.send(req);
}
void on_receiver_open(proton::receiver &) override {
send_request();
}
void on_message(proton::delivery &d, proton::message &response) override {
if (requests.empty()) return; // Spurious extra message!
std::cout << requests.front() << " => " << response.body() << std::endl;
requests.erase(requests.begin());
if (!requests.empty()) {
send_request();
} else {
d.connection().close();
}
}
};
int main(int argc, char **argv) {
std::string url("127.0.0.1:5672/examples");
example::options opts(argc, argv);
opts.add_value(url, 'a', "address", "connect and send to URL", "URL");
try {
opts.parse();
std::vector<std::string> requests;
requests.push_back("Twas brillig, and the slithy toves");
requests.push_back("Did gire and gymble in the wabe.");
requests.push_back("All mimsy were the borogroves,");
requests.push_back("And the mome raths outgrabe.");
client c(url, requests);
proton::container(c).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;
}
proton::connection::close
void close()
Close the connection.
proton::connection::open_receiver
receiver open_receiver(const std::string &addr)
Open a receiver for addr on default_session().
proton::container
A top-level container of connections, sessions, and links.
Definition container.hpp:49
proton::container::run
void run()
Run the container in the current thread.
proton::container::open_sender
returned< sender > open_sender(const std::string &addr_url)
Open a connection and sender for addr_url.
proton::delivery
A received message.
Definition delivery.hpp:40
proton::link::connection
class connection connection() const
The connection that owns this link.
proton::message
An AMQP message.
Definition message.hpp:48
proton::message::reply_to
void reply_to(const std::string &)
Set the address for replies.
proton::message::body
void body(const value &x)
Set the body. Equivalent to body() = x.
proton::messaging_handler
Handler for Proton messaging events.
Definition messaging_handler.hpp:69
proton::messaging_handler::on_message
virtual void on_message(delivery &, message &)
A message is received.
proton::messaging_handler::on_receiver_open
virtual void on_receiver_open(receiver &)
The remote peer opened the link.
proton::messaging_handler::on_container_start
virtual void on_container_start(container &)
The container event loop is starting.
proton::receiver_options
Options for creating a receiver.
Definition receiver_options.hpp:59
proton::receiver
A channel for receiving messages.
Definition receiver.hpp:41
proton::receiver::source
class source source() const
Get the source node.
proton::sender
A channel for sending messages.
Definition sender.hpp:40
proton::sender::send
tracker send(const message &m)
Send a message on the sender.
proton::source_options
Options for creating a source node for a sender or receiver.
Definition source_options.hpp:46
proton::source::address
std::string address() const
The address of the source.
proton::transfer::connection
class connection connection() const
Return the connection for this transfer.
connection.hpp
A connection to a remote AMQP peer.
container.hpp
A top-level container of connections, sessions, and links.
delivery.hpp
A received message.
message.hpp
An AMQP message.
messaging_handler.hpp
Handler for Proton messaging events.
receiver_options.hpp
Options for creating a receiver.
source_options.hpp
Options for creating a source node for a sender or receiver.
tracker.hpp
A tracker for a sent message.