PushFlowControl.cxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


#include "PushFlowControl.hxx"
#include "Processing.hxx"
#include "OutPort.hxx"
#include "InPort.hxx"
#include "Network.hxx"

namespace CLAM
{

PushFlowControl::PushFlowControl()
{
}

void PushFlowControl::ProcessingAddedToNetwork( Processing & added )
{
        NetworkTopologyChanged();

        if (added.GetInPorts().Size() == 0) // if it's a generator
                mGenerators.push_back( &added );
}

void PushFlowControl::ProcessingRemovedFromNetwork( Processing & removed )
{
        NetworkTopologyChanged();

        if (removed.GetInPorts().Size() == 0) // if it's a generator
                mGenerators.remove( &removed );
}

void PushFlowControl::Do()
{
        std::list< Processing* > toDo(mGenerators);

        while (!toDo.empty())
        {
                // pop the next processing
                Processing * next = *(toDo.begin()); // the first
                toDo.pop_front();

                if(next->CanConsumeAndProduce())
                {                       
                        next->Do();
                        std::cerr << "Consume "<<next->GetClassName() << std::endl;
                }
                else
                {
                        //std::cerr << "Can't consume "<<next->GetClassName() << std::endl;
                }
                AddNewPossibleProcessingsToDo(next, toDo);
        }
}

void PushFlowControl::AddNewPossibleProcessingsToDo(
        Processing * producer, 
        std::list<Processing*> & toDo )
{
        
        OutPortRegistry::Iterator itOutPort;
        
        for (itOutPort=producer->GetOutPorts().Begin(); 
                         itOutPort!=producer->GetOutPorts().End(); 
                         itOutPort++)
        {
                Network::InPortsList consumers;
                consumers = mNetwork->GetInPortsConnectedTo( **itOutPort );
                
                Network::InPortsList::iterator itInPort;

                for (itInPort=consumers.begin(); itInPort!=consumers.end(); itInPort++)
                  {     
                        //ignore orphan inports
                        if (!(*itInPort)->HasProcessing())
                                continue;

                        Processing * proc = (*itInPort)->GetProcessing();

                        if (proc->CanConsumeAndProduce())
                          {
                            //std::cerr <<"\n\t CAN"<<proc->GetClassName();
                                toDo.push_back( proc );
                          }
                }
        }
}

} // namespace CLAM

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