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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.
*
*/
#include "qpid/console/ConsoleListener.h"
#include "qpid/console/SessionManager.h"
#include "qpid/sys/Time.h"
#include "qpid/sys/Mutex.h"
#include <signal.h>
#include <map>
using namespace std;
using namespace qpid::console;
using qpid::sys::Mutex;
//
// This example maintains connections to a number of brokers (assumed
// to be running on localhost and at ports listed in the command line
// arguments).
//
// The program then periodically polls queue information from a
// single operational broker. This is a useful illustration of how
// one might monitor statistics on a cluster of brokers.
//
//==============================================================
// Main program
//==============================================================
//
// The Main class extends ConsoleListener so it can receive broker connected/disconnected
// notifications.
//
class Main : public ConsoleListener {
bool stopping; // Used to tell the program to exit
Mutex lock; // Mutex to protect the broker-map
map<Broker*, bool> brokerMap; // Map of broker-pointers to boolean "operational" status
public:
Main() : stopping(false) {}
/** Invoked when a connection is established to a broker
*/
void brokerConnected(const Broker& broker)
{
Mutex::ScopedLock l(lock);
brokerMap[const_cast<Broker*>(&broker)] = true;
}
/** Invoked when the connection to a broker is lost
*/
void brokerDisconnected(const Broker& broker)
{
Mutex::ScopedLock l(lock);
brokerMap[const_cast<Broker*>(&broker)] = false;
}
int run(int argc, char** argv)
{
//
// Tune the settings for this application: We will operate synchronously only, we don't
// wish to use the bandwidth needed to aysnchronously receive objects or events.
//
SessionManager::Settings sessionSettings;
sessionSettings.rcvObjects = false;
sessionSettings.rcvEvents = false;
sessionSettings.rcvHeartbeats = false;
SessionManager sm(this, sessionSettings);
//
// Connect to the brokers.
//
for (int idx = 1; idx < argc; idx++) {
qpid::client::ConnectionSettings connSettings;
connSettings.host = "localhost";
connSettings.port = atoi(argv[idx]);
Broker* broker = sm.addBroker(connSettings);
Mutex::ScopedLock l(lock);
brokerMap[broker] = false; // initially assume broker is disconnected
}
//
// Periodically poll the first connected broker.
//
while (!stopping) {
//
// Find an operational broker
//
Broker* operationalBroker = 0;
{
Mutex::ScopedLock l(lock);
for (map<Broker*, bool>::iterator iter = brokerMap.begin();
iter != brokerMap.end(); iter++) {
if (iter->second) {
operationalBroker = iter->first;
break;
}
}
}
if (operationalBroker != 0) {
Object::Vector list;
sm.getObjects(list, "queue", operationalBroker);
for (Object::Vector::iterator i = list.begin(); i != list.end(); i++) {
cout << "queue: " << i->attrString("name");
cout << " bindingCount=" << i->attrUint64("bindingCount") << endl;
}
} else {
cout << "No operational brokers" << endl;
}
qpid::sys::sleep(10);
if (stopping)
break;
}
{
//
// The following code structure uses the mutex to protect the broker map while
// ensuring that sm.delBroker is called without the mutex held (which leads to
// a deadlock).
//
Mutex::ScopedLock l(lock);
map<Broker*, bool>::iterator iter = brokerMap.begin();
while (iter != brokerMap.end()) {
Broker* broker = iter->first;
brokerMap.erase(iter);
{
Mutex::ScopedUnlock ul(lock);
sm.delBroker(broker);
}
iter = brokerMap.begin();
}
}
return 0;
}
void stop() {
stopping = true;
}
};
Main main_program;
void signal_handler(int)
{
main_program.stop();
}
int main(int argc, char** argv)
{
signal(SIGINT, signal_handler);
try {
return main_program.run(argc, argv);
} catch(std::exception& e) {
cout << "Top Level Exception: " << e.what() << endl;
}
}
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