GHOST_TimerManager.cpp

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#include "GHOST_TimerManager.h"

#include <algorithm>

#include "GHOST_TimerTask.h"


GHOST_TimerManager::GHOST_TimerManager()
{
}


GHOST_TimerManager::~GHOST_TimerManager()
{
    disposeTimers();
}


GHOST_TUns32 GHOST_TimerManager::getNumTimers()
{
    return (GHOST_TUns32)m_timers.size();
}


bool GHOST_TimerManager::getTimerFound(GHOST_TimerTask* timer)
{
    TTimerVector::const_iterator iter = std::find(m_timers.begin(), m_timers.end(), timer);
    return iter != m_timers.end();
}


GHOST_TSuccess GHOST_TimerManager::addTimer(GHOST_TimerTask* timer)
{
    GHOST_TSuccess success;
    if (!getTimerFound(timer)) {
        // Add the timer task
        m_timers.push_back(timer);
        success = GHOST_kSuccess;
    }
    else {
        success = GHOST_kFailure;
    }
    return success;
}


GHOST_TSuccess GHOST_TimerManager::removeTimer(GHOST_TimerTask* timer)
{
    GHOST_TSuccess success;
    TTimerVector::iterator iter = std::find(m_timers.begin(), m_timers.end(), timer);
    if (iter != m_timers.end()) {
        // Remove the timer task
        m_timers.erase(iter);
        delete timer;
        timer = 0;
        success = GHOST_kSuccess;
    }
    else {
        success = GHOST_kFailure;
    }
    return success;
}

GHOST_TUns64 GHOST_TimerManager::nextFireTime()
{
    GHOST_TUns64 smallest = GHOST_kFireTimeNever;
    TTimerVector::iterator iter;
    
    for (iter = m_timers.begin(); iter != m_timers.end(); iter++) {
        GHOST_TUns64 next = (*iter)->getNext();
        
        if (next<smallest)
            smallest = next;
    }
    
    return smallest;
}

bool GHOST_TimerManager::fireTimers(GHOST_TUns64 time)
{
    TTimerVector::iterator iter;
    bool anyProcessed = false;

    for (iter = m_timers.begin(); iter != m_timers.end(); iter++) {
        if (fireTimer(time, *iter))
            anyProcessed = true;
    }

    return anyProcessed;
}


bool GHOST_TimerManager::fireTimer(GHOST_TUns64 time, GHOST_TimerTask* task)
{
    GHOST_TUns64 next = task->getNext();

    // Check if the timer should be fired
    if (time > next) {
        // Fire the timer
        GHOST_TimerProcPtr timerProc = task->getTimerProc();
        GHOST_TUns64 start = task->getStart();
        timerProc(task, time - start);

        // Update the time at which we will fire it again
        GHOST_TUns64 interval = task->getInterval();
        GHOST_TUns64 numCalls = (next - start) / interval;
        numCalls++;
        next = start + numCalls * interval;
        task->setNext(next);

        return true;
    } else {
        return false;
    }
}


void GHOST_TimerManager::disposeTimers()
{
    while (m_timers.size() > 0) {
        delete m_timers[0];
        m_timers.erase(m_timers.begin());
    }
}