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Diffstat (limited to 'cpp/examples/examples/request-response/client.cpp')
-rw-r--r-- | cpp/examples/examples/request-response/client.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/cpp/examples/examples/request-response/client.cpp b/cpp/examples/examples/request-response/client.cpp new file mode 100644 index 0000000000..59024a1cb6 --- /dev/null +++ b/cpp/examples/examples/request-response/client.cpp @@ -0,0 +1,178 @@ +/* + * + * 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. + * + */ + + +/** + * client.cpp + * + * This program is one of two programs that illustrate the + * request/response pattern. + * + * client.cpp (this program) + * + * Make requests of a service, print the response. + * + * service.cpp + * + * Accept requests, reverse the letters in each message, and + * return it as a response. + * + */ + + +#include <qpid/client/Connection.h> +#include <qpid/client/Dispatcher.h> +#include <qpid/client/Session.h> +#include <qpid/client/Message.h> +#include <qpid/client/MessageListener.h> + +#include <unistd.h> +#include <cstdlib> +#include <iostream> + +#include <sstream> + +using namespace qpid::client; +using namespace qpid::framing; + +class Listener : public MessageListener{ +private: + Session session; + std::string destination_name; + Dispatcher dispatcher; + int counter; +public: + Listener(Session& session, string destination_name): + destination_name(destination_name), + dispatcher(session), + session(session), + counter(0) + {}; + + virtual void listen(); + virtual void wait(); + virtual void received(Message& message); + ~Listener() { }; +}; + + +void Listener::listen() { + std::cout << "Activating response queue listener for: " <<destination_name << std::endl; + + session.messageSubscribe(arg::queue=destination_name, arg::destination=destination_name); + + // Allocate credit. Sigh. This really should not be required ##### + session.messageFlow(arg::destination=destination_name, arg::unit=0, arg::value=1);//messages ### Define a constant? + session.messageFlow(arg::destination=destination_name, arg::unit=1, arg::value=0xFFFFFFFF);//bytes ###### Define a constant? + + + dispatcher.listen(destination_name, this); +} + + +void Listener::wait() { + std::cout << "Waiting for all responses to arrive ..." << std::endl; + dispatcher.run(); +} + + +void Listener::received(Message& message) { + std::cout << "Response: " << message.getData() << std::endl; + + ++ counter; + if (counter > 3) { + std::cout << "Shutting down listener for " << destination_name << std::endl; + dispatcher.stop(); + } +} + + +using std::stringstream; +using std::string; + +int main() { + Connection connection; + Message request; + try { + connection.open("127.0.0.1", 5672 ); + Session session = connection.newSession(); + + //--------- Main body of program -------------------------------------------- + + // Create a response queue so the server can send us responses + // to our requests. Use the client's session ID as the name + // of the response queue. + + stringstream response_queue; + response_queue << "client " << session.getId(); + + // Use the name of the response queue as the routing key + + session.queueDeclare(arg::queue=response_queue.str()); // ### Nice if I could just use strstream for this + session.queueBind(arg::queue=response_queue.str(), arg::routingKey=response_queue.str()); + + // Create a listener for the response queue and start listening. + + Listener listener(session, response_queue.str()); + listener.listen(); + + + // The routing key for the request queue is simply + // "request_queue", and all clients use the same routing key. + // + // Each client sends the name of their own response queue so + // the service knows where to route messages. + + request.getDeliveryProperties().setRoutingKey("request_queue"); + request.getHeaders().setString("reply-to", response_queue.str()); + + // Now send some requests ... + + string s[] = { + "Twas brillig, and the slithy toves", + "Did gire and gymble in the wabe.", + "All mimsy were the borogroves,", + "And the mome raths outgrabe." + }; + + + for (int i=0; i<4; i++) { + request.setData(s[i]); + session.messageTransfer(arg::content=request); + std::cout << "Request: " << s[i] << std::endl; + } + + // And wait for any outstanding responses to arrive + + listener.wait(); + + + //----------------------------------------------------------------------------- + + connection.close(); + return 0; + } catch(const std::exception& error) { + std::cout << error.what() << std::endl; + } + return 1; +} + + |