notificationqueue.cpp

This software aims to create an applet and panel tools to manage a wireless interface card, such as

//
// NotificationQueue.cpp
//
// $Id: //poco/Main/Foundation/src/NotificationQueue.cpp#5 $
//
// Copyright (c) 2004, Guenter Obiltschnig/Applied Informatics.
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 
// 3. Redistributions in any form must be accompanied by information on
//    how to obtain complete source code for this software and any
//    accompanying software that uses this software.  The source code
//    must either be included in the distribution or be available for no
//    more than the cost of distribution plus a nominal fee, and must be
//    freely redistributable under reasonable conditions.  For an
//    executable file, complete source code means the source code for all
//    modules it contains.  It does not include source code for modules or
//    files that typically accompany the major components of the operating
//    system on which the executable file runs.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//


#include "Foundation/NotificationQueue.h"
#include "Foundation/NotificationCenter.h"
#include "Foundation/Notification.h"
#include "Foundation/SingletonHolder.h"


Foundation_BEGIN


NotificationQueue::NotificationQueue()
{
}


NotificationQueue::~NotificationQueue()
{
	for (NfQueue::iterator it = _nfQueue.begin(); it != _nfQueue.end(); ++it)
	{
		(*it)->release();
	}
}


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();
	}	
}


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


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;
}


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;
}


void NotificationQueue::dispatch(NotificationCenter& notificationCenter)
{
	FastMutex::ScopedLock lock(_mutex);

	Notification* pNf = dequeueOne();
	while (pNf)
	{
		notificationCenter.postNotification(pNf);
		pNf = dequeueOne();
	}
}


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


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

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


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


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


Foundation_END