NetMessageHandler.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////


#include <net/NetMessageHandler.h>
#include <net/NetMessagePool.h>

NetMessageHandlerI::~NetMessageHandlerI()
{
}

NetMessageHandler::NetMessageHandler() : 
        handler_(0), messagesMutex_(0), messagesWaiting_(false)
{
        messagesMutex_ = SDL_CreateMutex();
}

NetMessageHandler::~NetMessageHandler()
{
        SDL_LockMutex(messagesMutex_);
        while (!messages_.empty())
        {
                NetMessage *message = messages_.front();
                messages_.pop_front();
                NetMessagePool::instance()->addToPool(message);
        }       
        SDL_UnlockMutex(messagesMutex_);

        SDL_DestroyMutex(messagesMutex_);
}

void NetMessageHandler::addMessage(NetMessage *message)
{
        SDL_LockMutex(messagesMutex_);
        messages_.push_back(message);
        messagesWaiting_ = true;
        SDL_UnlockMutex(messagesMutex_);
}

int NetMessageHandler::processMessages()
{
        if (!messagesWaiting_) return 0;

        // Get the list of messages that should be processed
        // Process one at a time, incase this method is called re-entrantly
        NetMessage *message = 0;
        SDL_LockMutex(messagesMutex_);
        if (!messages_.empty())
        {
                message = messages_.front();
                messages_.pop_front();
        }
        messagesWaiting_ = !messages_.empty();
        SDL_UnlockMutex(messagesMutex_);

        int result = 0;
        if (message)
        {
                result ++;

                // Call user to process message
                if (handler_) handler_->processMessage(*message);
                
                // Delete message
                NetMessagePool::instance()->addToPool(message);
        }
        return result;
}

void NetMessageHandler::setMessageHandler(NetMessageHandlerI *handler)
{
        handler_ = handler;
}

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