diff options
Diffstat (limited to 'cpp/examples/old_api/request-response/server.cpp')
-rw-r--r-- | cpp/examples/old_api/request-response/server.cpp | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/cpp/examples/old_api/request-response/server.cpp b/cpp/examples/old_api/request-response/server.cpp new file mode 100644 index 0000000000..65a4717b35 --- /dev/null +++ b/cpp/examples/old_api/request-response/server.cpp @@ -0,0 +1,161 @@ +/* + * + * 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. + * + */ + + +/** + * server.cpp + * + * This program is one of two programs that illustrate the + * request/response pattern. + * + * + * client.cpp + * + * A client application that sends messages to the "amq.direct" + * exchange, using the routing key "request" to route messages to + * the server. + * + * Each instance of the client creates its own private response + * queue, binding it to the "amq.direct" exchange using it's + * session identifier as the routing key, and places its session + * identifier in the "reply-to" property of each message it sends. + * + * + * server.cpp (this program) + * + * A service that accepts messages from a request queue, converts + * their content to upper case, and sends the result to the + * original sender. + * + * This program creates a request queue, binds it to "amq.direct" + * using the routing key "request", then receives messages from + * the request queue. Each incoming message is converted to upper + * case, then sent to the "amq.direct" exchange using the + * request's reply-to property as the routing key for the + * response. + * + * + */ + + +#include <qpid/client/Connection.h> +#include <qpid/client/Session.h> + +#include <qpid/client/AsyncSession.h> +#include <qpid/client/Message.h> +#include <qpid/client/MessageListener.h> +#include <qpid/client/SubscriptionManager.h> + +#include <cstdlib> +#include <iostream> + +#include <sstream> +#include <string> + +using namespace qpid::client; +using namespace qpid::framing; +using std::stringstream; +using std::string; + +class Listener : public MessageListener{ + private: + SubscriptionManager& subscriptions; + AsyncSession asyncSession; + public: + Listener(SubscriptionManager& subscriptions, Session& session); + virtual void received(Message& message); +}; + +Listener::Listener(SubscriptionManager& subs, Session& session) + : subscriptions(subs), asyncSession(session) +{} + +void Listener::received(Message& request) { + Message response; + + // Get routing key for response from the request's replyTo property + string routingKey; + + if (request.getMessageProperties().hasReplyTo()) { + routingKey = request.getMessageProperties().getReplyTo().getRoutingKey(); + } else { + std::cout << "Error: " << "No routing key for request (" << request.getData() << ")" << std::endl; + return; + } + + std::cout << "Request: " << request.getData() << " (" <<routingKey << ")" << std::endl; + + // Transform message content to upper case + std::string s = request.getData(); + std::transform (s.begin(), s.end(), s.begin(), toupper); + response.setData(s); + + // Send it back to the user + response.getDeliveryProperties().setRoutingKey(routingKey); + + // Asynchronous transfer sends messages as quickly as + // possible without waiting for confirmation. + asyncSession.messageTransfer(arg::content=response, arg::destination="amq.direct"); +} + + +int main(int argc, char** argv) { + const char* host = argc>1 ? argv[1] : "127.0.0.1"; + int port = argc>2 ? atoi(argv[2]) : 5672; + Connection connection; + + try { + connection.open(host, port); + Session session = connection.newSession(); + + //--------- Main body of program -------------------------------------------- + + + // Create a request queue for clients to use when making + // requests. + string request_queue = "request"; + + // Use the name of the request queue as the routing key + session.queueDeclare(arg::queue=request_queue); + session.exchangeBind(arg::exchange="amq.direct", arg::queue=request_queue, arg::bindingKey=request_queue); + + // Create a listener and subscribe it to the request_queue + std::cout << "Activating request queue listener for: " << request_queue << std::endl; + SubscriptionManager subscriptions(session); + Listener listener(subscriptions, session); + subscriptions.subscribe(listener, request_queue); + // Deliver messages until the subscription is cancelled + // by Listener::received() + + std::cout << "Waiting for requests" << std::endl; + subscriptions.run(); + + //----------------------------------------------------------------------------- + + connection.close(); + return 0; + } catch(const std::exception& error) { + std::cout << error.what() << std::endl; + } + return 1; +} + + |