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+/*
+ *
+ * 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.
+ *
+ */
+
+/**
+ * This file provides one half of a test and example of a pub-sub
+ * style of interaction. See qpid-topic-publisher.cpp for the other half,
+ * in which the logic for publishing is defined.
+ *
+ * This file contains the listener logic. A listener will subscribe to
+ * a logical 'topic'. It will count the number of messages it receives
+ * and the time elapsed between the first one and the last one. It
+ * recognises two types of 'special' message that tell it to (a) send
+ * a report containing this information, (b) shutdown (i.e. stop
+ * listening).
+ */
+
+#include "TestOptions.h"
+#include "qpid/client/Connection.h"
+#include "qpid/client/MessageListener.h"
+#include "qpid/client/Session.h"
+#include "qpid/client/AsyncSession.h"
+#include "qpid/client/SubscriptionManager.h"
+#include "qpid/sys/SystemInfo.h"
+#include "qpid/sys/Time.h"
+#include "qpid/framing/FieldValue.h"
+#include <iostream>
+#include <sstream>
+
+using namespace qpid;
+using namespace qpid::client;
+using namespace qpid::sys;
+using namespace qpid::framing;
+using namespace std;
+
+namespace qpid {
+namespace tests {
+
+/**
+ * A message listener implementation in which the runtime logic is
+ * defined.
+ */
+class Listener : public MessageListener{
+ Session session;
+ SubscriptionManager& mgr;
+ const string responseQueue;
+ const bool transactional;
+ bool init;
+ int count;
+ AbsTime start;
+
+ void shutdown();
+ void report();
+public:
+ Listener(const Session& session, SubscriptionManager& mgr, const string& reponseQueue, bool tx);
+ virtual void received(Message& msg);
+ Subscription subscription;
+};
+
+/**
+ * A utility class for managing the options passed in.
+ */
+struct Args : public qpid::TestOptions {
+ int ack;
+ bool transactional;
+ bool durable;
+ int prefetch;
+ string statusqueue;
+
+ Args() : ack(0), transactional(false), durable(false), prefetch(0) {
+ addOptions()
+ ("ack", optValue(ack, "MODE"), "Ack frequency in messages (defaults to half the prefetch value)")
+ ("transactional", optValue(transactional), "Use transactions")
+ ("durable", optValue(durable), "subscribers should use durable queues")
+ ("prefetch", optValue(prefetch, "N"), "prefetch count (0 implies no flow control, and no acking)")
+ ("status-queue", optValue(statusqueue, "QUEUE-NAME"), "Message queue to put status messages on");
+ }
+};
+
+Listener::Listener(const Session& s, SubscriptionManager& m, const string& _responseq, bool tx) :
+ session(s), mgr(m), responseQueue(_responseq), transactional(tx), init(false), count(0){}
+
+void Listener::received(Message& message){
+ if(!init){
+ start = now();
+ count = 0;
+ init = true;
+ cout << "Batch started." << endl;
+ }
+ string type = message.getHeaders().getAsString("TYPE");
+
+ if(string("TERMINATION_REQUEST") == type){
+ shutdown();
+ }else if(string("REPORT_REQUEST") == type){
+ subscription.accept(subscription.getUnaccepted()); // Accept everything upto this point
+ cout <<"Batch ended, sending report." << endl;
+ //send a report:
+ report();
+ init = false;
+ }else if (++count % 1000 == 0){
+ cout <<"Received " << count << " messages." << endl;
+ }
+}
+
+void Listener::shutdown(){
+ mgr.stop();
+}
+
+void Listener::report(){
+ AbsTime finish = now();
+ Duration time(start, finish);
+ stringstream reportstr;
+ reportstr << "Received " << count << " messages in "
+ << time/TIME_MSEC << " ms.";
+ Message msg(reportstr.str(), responseQueue);
+ msg.getHeaders().setString("TYPE", "REPORT");
+ session.messageTransfer(arg::destination="amq.direct", arg::content=msg, arg::acceptMode=1);
+ if(transactional){
+ sync(session).txCommit();
+ }
+}
+
+}} // namespace qpid::tests
+
+using namespace qpid::tests;
+
+/**
+ * The main routine creates a Listener instance and sets it up to
+ * consume from a private queue bound to the exchange with the
+ * appropriate topic name.
+ */
+int main(int argc, char** argv){
+ try{
+ Args args;
+ args.parse(argc, argv);
+ if(args.help)
+ cout << args << endl;
+ else {
+ Connection connection;
+ args.open(connection);
+ AsyncSession session = connection.newSession();
+
+ //declare exchange, queue and bind them:
+ session.queueDeclare(arg::queue="response");
+ std::string control = "control_" + session.getId().str();
+ if (args.durable) {
+ session.queueDeclare(arg::queue=control, arg::durable=true);
+ } else {
+ session.queueDeclare(arg::queue=control, arg::exclusive=true, arg::autoDelete=true);
+ }
+ session.exchangeBind(arg::exchange="amq.topic", arg::queue=control, arg::bindingKey="topic_control");
+
+ //set up listener
+ SubscriptionManager mgr(session);
+ Listener listener(session, mgr, "response", args.transactional);
+ SubscriptionSettings settings;
+ if (args.prefetch) {
+ settings.autoAck = (args.ack ? args.ack : (args.prefetch / 2));
+ settings.flowControl = FlowControl::messageCredit(args.prefetch);
+ } else {
+ settings.acceptMode = ACCEPT_MODE_NONE;
+ settings.flowControl = FlowControl::unlimited();
+ }
+ listener.subscription = mgr.subscribe(listener, control, settings);
+ session.sync();
+
+ if( args.statusqueue.length() > 0 ) {
+ stringstream msg_str;
+ msg_str << "qpid-topic-listener: " << qpid::sys::SystemInfo::getProcessId();
+ session.messageTransfer(arg::content=Message(msg_str.str(), args.statusqueue));
+ cout << "Ready status put on queue '" << args.statusqueue << "'" << endl;
+ }
+
+ if (args.transactional) {
+ session.txSelect();
+ }
+
+ cout << "qpid-topic-listener: listening..." << endl;
+ mgr.run();
+ if (args.durable) {
+ session.queueDelete(arg::queue=control);
+ }
+ session.close();
+ cout << "closing connection" << endl;
+ connection.close();
+ }
+ return 0;
+ } catch (const std::exception& error) {
+ cout << "qpid-topic-listener: " << error.what() << endl;
+ }
+ return 1;
+}