//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. 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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//==============================================================================
//
//%/////////////////////////////////////////////////////////////////////////////

#include <new>
#include "IDFactory.h"

PEGASUS_NAMESPACE_BEGIN

IDFactory::IDFactory(Uint32 firstID) : _firstID(firstID), _nextID(_firstID)
{
}

IDFactory::~IDFactory()
{
    PEGASUS_DEBUG_ASSERT(_magic);
}

Uint32 IDFactory::getID() const
{
    PEGASUS_DEBUG_ASSERT(_magic);

    IDFactory* self = (IDFactory*)this;

    Uint32 id;

    self->_mutex.lock();
    {
        if (_pool.isEmpty())
        {
            if (self->_nextID < _firstID)
                self->_nextID = _firstID;

            id = self->_nextID++;
        }
        else
        {
            id = _pool.top();
            self->_pool.pop();
        }
    }
    self->_mutex.unlock();

    return id;
}

void IDFactory::putID(Uint32 id)
{
    PEGASUS_DEBUG_ASSERT(_magic);
    PEGASUS_DEBUG_ASSERT(id >= _firstID);

    if (id < _firstID)
        return;

    _mutex.lock();
    {
        _pool.push(id);
    }
    _mutex.unlock();
}

PEGASUS_NAMESPACE_END