server_direct.cpp

A variant of the server part of a request-response example that accepts incoming connections and does not need an intermediary. Much like the original server, it receives incoming requests, converts the body to uppercase and sends the result back to the indicated reply address. Can be used in conjunction with any of the client alternatives.

/*
*
* 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/container.hpp>
#include <proton/listen_handler.hpp>
#include <proton/listener.hpp>
#include <proton/message.hpp>
#include <proton/message_id.hpp>
#include <proton/messaging_handler.hpp>
#include <proton/sender.hpp>
#include <proton/sender_options.hpp>
#include <proton/source_options.hpp>
#include <proton/tracker.hpp>
#include <iostream>
#include <map>
#include <string>
#include <sstream>
#include <cctype>
#include "fake_cpp11.hpp"
class server : public proton::messaging_handler {
private:
class listener_ready_handler : public proton::listen_handler {
void on_open(proton::listener& l) OVERRIDE {
std::cout << "listening on " << l.port() << std::endl;
}
};
typedef std::map<std::string, proton::sender> sender_map;
listener_ready_handler listen_handler;
std::string url;
sender_map senders;
int address_counter;
public:
server(const std::string &u) : url(u), address_counter(0) {}
void on_container_start(proton::container &c) OVERRIDE {
c.listen(url, listen_handler);
}
std::string to_upper(const std::string &s) {
std::string uc(s);
size_t l = uc.size();
for (size_t i=0; i<l; i++)
uc[i] = static_cast<char>(std::toupper(uc[i]));
return uc;
}
std::string generate_address() {
std::ostringstream addr;
addr << "server" << address_counter++;
return addr.str();
}
void on_sender_open(proton::sender &sender) OVERRIDE {
if (sender.source().dynamic()) {
std::string addr = generate_address();
sender.open(proton::sender_options().source(proton::source_options().address(addr)));
senders[addr] = sender;
}
}
void on_message(proton::delivery &, proton::message &m) OVERRIDE {
std::cout << "Received " << m.body() << std::endl;
std::string reply_to = m.reply_to();
sender_map::iterator it = senders.find(reply_to);
if (it == senders.end()) {
std::cout << "No link for reply_to: " << reply_to << std::endl;
} else {
proton::sender sender = it->second;
proton::message reply;
reply.to(reply_to);
reply.body(to_upper(proton::get<std::string>(m.body())));
reply.correlation_id(m.correlation_id());
sender.send(reply);
}
}
};
int main(int argc, char **argv) {
std::string address("amqp://127.0.0.1:5672/examples");
example::options opts(argc, argv);
opts.add_value(address, 'a', "address", "listen on URL", "URL");
try {
opts.parse();
server srv(address);
proton::container(srv).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;
}
listener.hpp
messaging_handler.hpp
message.hpp
tracker.hpp
proton::source_options
Options for creating a source node for a sender or receiver.
Definition: source_options.hpp:44
proton::listener
A listener for incoming connections.
Definition: listener.hpp:33
proton::container
A top-level container of connections, sessions, and links.
Definition: container.hpp:50
proton::messaging_handler::on_container_start
virtual void on_container_start(container &)
The container event loop is starting.
proton::terminus::dynamic
bool dynamic() const
True if the remote node is created dynamically.
proton::container::listen
listener listen(const std::string &listen_url, listen_handler &handler)
Listen for new connections on listen_url.
proton::messaging_handler::on_message
virtual void on_message(delivery &, message &)
A message is received.
proton::delivery
A received message.
Definition: delivery.hpp:39
listen_handler.hpp
proton::sender_options
Options for creating a sender.
Definition: sender_options.hpp:57
sender.hpp
proton::sender::send
tracker send(const message &m)
Send a message on the sender.
proton::sender::source
class source source() const
Get the source node.
proton::messaging_handler
A handler for Proton messaging events.
Definition: messaging_handler.hpp:62
sender_options.hpp
proton::message::correlation_id
void correlation_id(const message_id &)
Set the ID for matching related messages.
proton::sender
A channel for sending messages.
Definition: sender.hpp:39
source_options.hpp
proton::listener::port
int port()
Unsettedled API
proton::listen_handler
Unsettled API - A handler for incoming connections.
Definition: listen_handler.hpp:39
message_id.hpp
proton::message::body
void body(const value &x)
Set the body. Equivalent to body() = x.
proton::message::reply_to
void reply_to(const std::string &)
Set the address for replies.
proton::messaging_handler::on_sender_open
virtual void on_sender_open(sender &)
The remote peer opened the link.
proton::container::run
void run()
Run the container in the current thread.
container.hpp
proton::message::to
void to(const std::string &)
Set the destination address.
proton::message
An AMQP message.
Definition: message.hpp:50
proton::sender::open
void open()
Open the sender.