timer.cpp

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

//
// Timer.cpp
//
// $Id: //poco/Main/Foundation/src/Timer.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/Timer.h"
#include "Foundation/ThreadPool.h"
#include "Foundation/Exception.h"


Foundation_BEGIN


Timer::Timer(long startInterval, long periodicInterval): 
	_startInterval(startInterval), 
	_periodicInterval(periodicInterval),
	_pCallback(0)
{
	poco_assert (startInterval >= 0 && periodicInterval >= 0);
}


Timer::~Timer()
{
	stop();
}


void Timer::start(const AbstractTimerCallback& method)
{
	poco_assert (!_pCallback);

	FastMutex::ScopedLock lock(_mutex);	
	_pCallback = method.clone();
	_wakeUp.reset();
	ThreadPool::defaultPool().start(*this);
}


void Timer::stop()
{
	FastMutex::ScopedLock lock(_mutex);
	if (_pCallback)
	{
		_periodicInterval = 0;
		_mutex.unlock();
		_wakeUp.set();
		_done.wait(); // warning: deadlock if called from timer callback
		_mutex.lock();
		delete _pCallback;
		_pCallback = 0;
	}
}


void Timer::restart()
{
	FastMutex::ScopedLock lock(_mutex);
	if (_pCallback)
	{
		_wakeUp.set();
	}
}


void Timer::restart(long milliseconds)
{
	poco_assert (milliseconds >= 0);
	FastMutex::ScopedLock lock(_mutex);
	if (_pCallback)
	{
		_periodicInterval = milliseconds;
		_wakeUp.set();
	}
}


long Timer::getStartInterval() const
{
	FastMutex::ScopedLock lock(_mutex);
	return _startInterval;
}


void Timer::setStartInterval(long milliseconds)
{
	poco_assert (milliseconds >= 0);
	FastMutex::ScopedLock lock(_mutex);
	_startInterval = milliseconds;
}


long Timer::getPeriodicInterval() const
{
	FastMutex::ScopedLock lock(_mutex);
	return _periodicInterval;
}


void Timer::setPeriodicInterval(long milliseconds)
{
	poco_assert (milliseconds >= 0);
	FastMutex::ScopedLock lock(_mutex);
	_periodicInterval = milliseconds;
}


void Timer::run()
{
	long interval;
	{
		FastMutex::ScopedLock lock(_mutex);
		interval = _startInterval;
	}
	do
	{
		if (_wakeUp.tryWait(interval))
		{
			FastMutex::ScopedLock lock(_mutex);
			interval = _periodicInterval;
		}
		else
		{
			try
			{
				_pCallback->invoke(*this);
			}
			catch (std::exception& e)
			{
				poco_bugcheck_msg(e.what());
			}
			catch (...)
			{
				poco_bugcheck();
			}
			{
				FastMutex::ScopedLock lock(_mutex);
				interval = _periodicInterval;
			}
		}
	}
	while (interval > 0);
	_done.set();
}


AbstractTimerCallback::AbstractTimerCallback()
{
}


AbstractTimerCallback::AbstractTimerCallback(const AbstractTimerCallback& callback)
{
}


AbstractTimerCallback::~AbstractTimerCallback()
{
}


AbstractTimerCallback& AbstractTimerCallback::operator = (const AbstractTimerCallback& callback)
{
	return *this;
}


Foundation_END