source: XMLIO_V2/external/src/POCO/Foundation.save/Timer.cpp @ 80

//
// Timer.cpp
//
// $Id: //poco/1.3/Foundation/src/Timer.cpp#7 $
//
// Library: Foundation
// Package: Threading
// Module:  Timer
//
// 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/Timer.h"
#include "Poco/ThreadPool.h"
#include "Poco/Exception.h"
#include "Poco/ErrorHandler.h"


namespace Poco {


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)
{
        start(method, Thread::PRIO_NORMAL, ThreadPool::defaultPool());
}


void Timer::start(const AbstractTimerCallback& method, Thread::Priority priority)
{
        start(method, priority, ThreadPool::defaultPool());
}


void Timer::start(const AbstractTimerCallback& method, ThreadPool& threadPool)
{
        start(method, Thread::PRIO_NORMAL, threadPool);
}


void Timer::start(const AbstractTimerCallback& method, Thread::Priority priority, ThreadPool& threadPool)
{
        Timestamp nextInvocation;
        nextInvocation += _startInterval*1000;

        poco_assert (!_pCallback);

        FastMutex::ScopedLock lock(_mutex);     
        _nextInvocation = nextInvocation;
        _pCallback = method.clone();
        _wakeUp.reset();
        threadPool.startWithPriority(priority, *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()
{
        Timestamp now;
        long interval(0);
        do
        {
                now.update();
                long sleep = static_cast<long>((_nextInvocation - now)/1000);
                if (sleep < 0) sleep = 0;
                if (_wakeUp.tryWait(sleep))
                {
                        FastMutex::ScopedLock lock(_mutex);
                        _nextInvocation.update();
                        interval = _periodicInterval;
                }
                else
                {
                        try
                        {
                                _pCallback->invoke(*this);
                        }
                        catch (Exception& exc)
                        {
                                ErrorHandler::handle(exc);
                        }
                        catch (std::exception& exc)
                        {
                                ErrorHandler::handle(exc);
                        }
                        catch (...)
                        {
                                ErrorHandler::handle();
                        }
                        {
                                FastMutex::ScopedLock lock(_mutex);
                                interval = _periodicInterval;
                        }
                }
                _nextInvocation += static_cast<Timestamp::TimeDiff>(interval)*1000;
        }
        while (interval > 0);
        _done.set();
}


AbstractTimerCallback::AbstractTimerCallback()
{
}


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


AbstractTimerCallback::~AbstractTimerCallback()
{
}


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


} // namespace Poco