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NotificationQueue.cpp

//
// NotificationQueue.cpp
//
// $Id: //poco/1.2/Foundation/samples/NotificationQueue/src/NotificationQueue.cpp#1 $
//
// This sample demonstrates the NotificationQueue, ThreadPool,
// FastMutex and ScopedLock classes.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Notification.h"
#include "Poco/NotificationQueue.h"
#include "Poco/ThreadPool.h"
#include "Poco/Thread.h"
#include "Poco/Runnable.h"
#include "Poco/Mutex.h"
#include "Poco/Random.h"
#include "Poco/AutoPtr.h"
#include <iostream>


using Poco::Notification;
using Poco::NotificationQueue;
using Poco::ThreadPool;
using Poco::Thread;
using Poco::Runnable;
using Poco::FastMutex;
using Poco::Random;
using Poco::AutoPtr;


class WorkNotification: public Notification
      // The notification sent to worker threads.
{
public:
      WorkNotification(int data):
            _data(data)
      {
      }
      
      int data() const
      {
            return _data;
      }

private:
      int _data;
};


class Worker: public Runnable
      // A worker thread that gets work items
      // from a NotificationQueue.
{
public:
      Worker(const std::string& name, NotificationQueue& queue):
            _name(name),
            _queue(queue)
      {
      }
      
      void run()
      {
            Random rnd;
            for (;;)
            {
                  AutoPtr<Notification> pNf(_queue.waitDequeueNotification());
                  if (pNf)
                  {
                        WorkNotification* pWorkNf = dynamic_cast<WorkNotification*>(pNf.get());
                        if (pWorkNf)
                        {
                              FastMutex::ScopedLock lock(_mutex);
                              
                              std::cout << _name << " got work notification " << pWorkNf->data() << std::endl;
                              
                              Thread::sleep(rnd.next(200));
                        }
                  }
                  else break;
            }
      }
      
private:
      std::string        _name;
      NotificationQueue& _queue;
      static FastMutex   _mutex;
};


FastMutex Worker::_mutex;


int main(int argc, char** argv)
{
      NotificationQueue queue;
      
      // create some worker threads
      Worker worker1("Worker 1", queue);
      Worker worker2("Worker 2", queue);
      Worker worker3("Worker 3", queue);

      // start worker threads
      ThreadPool::defaultPool().start(worker1);
      ThreadPool::defaultPool().start(worker2);
      ThreadPool::defaultPool().start(worker3);

      // distribute some work
      for (int i = 0; i < 50; ++i)
      {
            queue.enqueueNotification(new WorkNotification(i));
      }
      
      // wait until queue is empty and all threads are 
      // waiting for new work.
      while (!queue.empty()) Thread::sleep(200);
      Thread::sleep(500);
      
      // stop all worker threads
      queue.wakeUpAll();
      ThreadPool::defaultPool().joinAll();
      
      return 0;
}

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