Logo Search packages:      
Sourcecode: poco version File versions  Download package

NotificationQueue.cpp

//
// NotificationQueue.cpp
//
// $Id: //poco/1.3/Foundation/src/NotificationQueue.cpp#1 $
//
// Library: Foundation
// Package: Notifications
// Module:  NotificationQueue
//
// 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/NotificationQueue.h"
#include "Poco/NotificationCenter.h"
#include "Poco/Notification.h"
#include "Poco/SingletonHolder.h"


namespace Poco {


NotificationQueue::NotificationQueue()
{
}


00051 NotificationQueue::~NotificationQueue()
{
      clear();
}


00057 void NotificationQueue::enqueueNotification(Notification* pNotification)
{
      poco_check_ptr (pNotification);
      FastMutex::ScopedLock lock(_mutex);
      if (_waitQueue.empty())
      {
            _nfQueue.push_back(pNotification);
      }
      else
      {
            WaitInfo* pWI = _waitQueue.front();
            _waitQueue.pop_front();
            pWI->pNf = pNotification;
            pWI->nfAvailable.set();
      }     
}


00075 void NotificationQueue::enqueueUrgentNotification(Notification* pNotification)
{
      poco_check_ptr (pNotification);
      FastMutex::ScopedLock lock(_mutex);
      if (_waitQueue.empty())
      {
            _nfQueue.push_front(pNotification);
      }
      else
      {
            WaitInfo* pWI = _waitQueue.front();
            _waitQueue.pop_front();
            pWI->pNf = pNotification;
            pWI->nfAvailable.set();
      }     
}


00093 Notification* NotificationQueue::dequeueNotification()
{
      FastMutex::ScopedLock lock(_mutex);
      return dequeueOne();
}


00100 Notification* NotificationQueue::waitDequeueNotification()
{
      Notification* pNf = 0;
      WaitInfo*     pWI = 0;
      {
            FastMutex::ScopedLock lock(_mutex);
            pNf = dequeueOne();
            if (pNf) return pNf;
            pWI = new WaitInfo;
            pWI->pNf = 0;
            _waitQueue.push_back(pWI);
      }
      pWI->nfAvailable.wait();
      pNf = pWI->pNf;
      delete pWI;
      return pNf;
}


00119 Notification* NotificationQueue::waitDequeueNotification(long milliseconds)
{
      Notification* pNf = 0;
      WaitInfo*     pWI = 0;
      {
            FastMutex::ScopedLock lock(_mutex);
            pNf = dequeueOne();
            if (pNf) return pNf;
            pWI = new WaitInfo;
            pWI->pNf = 0;
            _waitQueue.push_back(pWI);
      }
      if (pWI->nfAvailable.tryWait(milliseconds))
      {
            pNf = pWI->pNf;
      }
      else
      {
            FastMutex::ScopedLock lock(_mutex);
            pNf = pWI->pNf;
            for (WaitQueue::iterator it = _waitQueue.begin(); it != _waitQueue.end(); ++it)
            {
                  if (*it == pWI)
                  {
                        _waitQueue.erase(it);
                        break;
                  }
            }
      }
      delete pWI;
      return pNf;
}


00153 void NotificationQueue::dispatch(NotificationCenter& notificationCenter)
{
      FastMutex::ScopedLock lock(_mutex);
      Notification* pNf = dequeueOne();
      while (pNf)
      {
            notificationCenter.postNotification(pNf);
            pNf = dequeueOne();
      }
}


00165 void NotificationQueue::wakeUpAll()
{
      FastMutex::ScopedLock lock(_mutex);
      for (WaitQueue::iterator it = _waitQueue.begin(); it != _waitQueue.end(); ++it)
      {
            (*it)->nfAvailable.set();
      }
      _waitQueue.clear();
}


00176 bool NotificationQueue::empty() const
{
      FastMutex::ScopedLock lock(_mutex);
      return _nfQueue.empty();
}

      
00183 int NotificationQueue::size() const
{
      FastMutex::ScopedLock lock(_mutex);
      return int(_nfQueue.size());
}


00190 void NotificationQueue::clear()
{
      FastMutex::ScopedLock lock(_mutex);
      for (NfQueue::iterator it = _nfQueue.begin(); it != _nfQueue.end(); ++it)
      {
            (*it)->release();
      }
      _nfQueue.clear(); 
}


00201 bool NotificationQueue::hasIdleThreads() const
{
      FastMutex::ScopedLock lock(_mutex);
      return !_waitQueue.empty();
}


00208 Notification* NotificationQueue::dequeueOne()
{
      Notification* pNf = 0;
      if (!_nfQueue.empty())
      {
            pNf = _nfQueue.front();
            _nfQueue.pop_front();
      }
      return pNf;
}


00220 NotificationQueue& NotificationQueue::defaultQueue()
{
      static SingletonHolder<NotificationQueue> sh;
      return *sh.get();
}


} // namespace Poco

Generated by  Doxygen 1.6.0   Back to index