vos/corelibs/vos/refcount.cc

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/*
    This file is part of the Virtual Object System of
    the Interreality project (http://interreality.org).

    Copyright (C) 2001, 2002 Peter Amstutz

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA

    Peter Amstutz <tetron@interreality.org>
*/
#include <stdexcept>

#include "refcount.hh"
#include "log.hh"

using namespace VOS;

void RefCounted::acquire() { ++count; }
void RefCounted::release() { if(--count == 0) destroy(); }
int RefCounted::getCount() { return count; }

void RefCounted::destroy() {
    delete this;
}

void RefCounted::addExciseListener(ObjectExciseListener* oel) {
    if(! exciseListeners) exciseListeners = new set<ObjectExciseListener*>;
    if(RefCounted* rc = dynamic_cast<RefCounted*>(oel)) rc->acquire(); // released by: removeExciseListener
    exciseListeners->insert(oel);
}

void RefCounted::removeExciseListener(ObjectExciseListener* oel, bool releaseIfRefcounted) {
    if(oel) {
        if(exciseListeners) {
            exciseListeners->erase(oel);
            if(releaseIfRefcounted)
                if(RefCounted* rc = dynamic_cast<RefCounted*>(oel)) {
                    rc->release(); // acquired by: addExciseListener
                }
        }
    }
}

void RefCounted::excise() {
    if(exciseListeners) {
        // copying the set avoids concurrent modifications of the set
        // which tend to crash things
        set<ObjectExciseListener*> setcopy = *exciseListeners;
        for(set<ObjectExciseListener*>::iterator it = setcopy.begin();
            it != setcopy.end();
            it++) {
            try {
                if(*it) (*it)->notifyObjectExcise(this);
            } catch(exception& x) {
                LOG("refcount", 0, "call to notifyObjectExcise emitted exception: " << x.what());
            } catch(...) { }
        }
        delete exciseListeners;
        exciseListeners = 0;
    }
}

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