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watchble.cpp

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// $Id$

//**********************************************************************
//                                                                     *
//    Description:   Watchable object base class.                      *
//                                                                     *
//    Author:        Chris White (whitecf@bcs.org.uk)                  *
//                                                                     *
//    Copyright (C) 2003  Monitor Computing Services Ltd.              *
//                                                                     *
//    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 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 (http://www.gnu.org/copyleft/gpl.html) along with this   *
//    program; if not, write to:                                       *
//       The Free Software Foundation Inc.,                            *
//       59 Temple Place - Suite 330,                                  *
//       Boston, MA  02111-1307,                                       *
//       USA.                                                          *
//                                                                     *
//**********************************************************************
//                                                                     *
//    Notes:                                                           *
//                                                                     *
//**********************************************************************



#include <cllbklst.h>
#include <mytrace.h>

#include "watchble.h"


using namespace Monitor::Utility;



Watchable::Watchable()
    :
    watchList(new CallbackList()),
    frozen(0)
{
    _USEMYTRACE_("Watchable::Watchable()")
}



Watchable::~Watchable()
{
    _USEMYTRACE_("Watchable::~Watchable()")


    delete watchList, watchList = 0;
}



const CallbackBase&
Watchable::addWatch(const CallbackBase&    newWatch) const
{
    _USEMYTRACE_("Watchable::addWatch(newWatch)")


    watchList->addCallback(newWatch);

    return newWatch;
}



void
Watchable::removeWatch(const CallbackBase&    oldWatch) const
{
    _USEMYTRACE_("Watchable::removeWatch(oldWatch)")


    watchList->removeCallback(oldWatch);
}



void
Watchable::removeWatcher(const void*    watcher) const
{
    _USEMYTRACE_("Watchable::removeWatcher(watcher)")


    watchList->removeTarget(watcher);
}



void
Watchable::updated(const void    *updateData) const
{
    _USEMYTRACE_("Watchable::updated(updateData)")


    if (!frozen)
    {
        watchList->invoke(updateData);
    }
}



void
Watchable::freeze() const
{
    _USEMYTRACE_("Watchable::freeze()")


    frozen = !0;
}



void
Watchable::thaw() const
{
    _USEMYTRACE_("Watchable::thaw()")


    frozen = 0;
}

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