daemon/src/core/EventSwitch.cpp

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/*
 * EventSwitch.cpp
 *
 *  Created on: 05.03.2009
 *      Author: morgenro
 */

#include "core/EventSwitch.h"

#include <ibrcommon/thread/MutexLock.h>
#include "core/GlobalEvent.h"
#include <stdexcept>
#include <iostream>
using namespace std;

namespace dtn
{
        namespace core
        {
                EventSwitch::EventSwitch()
                 : _running(false)
                {
                }

                EventSwitch::~EventSwitch()
                {
                        componentDown();
                }

                void EventSwitch::componentUp()
                {
                }

                void EventSwitch::componentDown()
                {
                        try {
                                while (!_queue.empty())
                                {
                                        delete _queue.frontpop();
                                }
                        } catch (ibrcommon::Exception) {

                        }

                        _running = false;
                        _queue.unblock();
                }

                void EventSwitch::loop()
                {
                        _running = true;

                        try {
                                while (_running)
                                {
                                        Event *evt = _queue.blockingpop();
                                        dtn::core::GlobalEvent *global = dynamic_cast<dtn::core::GlobalEvent*>(evt);

                                        {
                                                ibrcommon::MutexLock reglock(_receiverlock);

                                                // forward to debugger
                                                _debugger.raiseEvent(evt);

                                                try {
                                                        // get the list for this event
                                                        const list<EventReceiver*> receivers = getReceivers(evt->getName());

                                                        for (list<EventReceiver*>::const_iterator iter = receivers.begin(); iter != receivers.end(); iter++)
                                                        {
                                                                try {
                                                                        (*iter)->raiseEvent(evt);
                                                                } catch (...) {
                                                                        // An error occurred during event raising
                                                                }
                                                        }
                                                } catch (NoReceiverFoundException ex) {
                                                        // No receiver available!
                                                }
                                        }

                                        if (global != NULL)
                                        {
                                                if (global->getAction() == dtn::core::GlobalEvent::GLOBAL_SHUTDOWN)
                                                {
                                                        _running = false;
                                                }
                                        }

                                        delete evt;
                                }
                        } catch (ibrcommon::Exception) {
                                _running = false;
                        }
                }

                const list<EventReceiver*>& EventSwitch::getReceivers(string eventName) const
                {
                        map<string,list<EventReceiver*> >::const_iterator iter = _list.find(eventName);

                        if (iter == _list.end())
                        {
                                throw NoReceiverFoundException();
                        }

                        return iter->second;
                }

                void EventSwitch::registerEventReceiver(string eventName, EventReceiver *receiver)
                {
                        // get the list for this event
                        EventSwitch &s = EventSwitch::getInstance();
                        ibrcommon::MutexLock l(s._receiverlock);
                        s._list[eventName].push_back(receiver);
                }

                void EventSwitch::unregisterEventReceiver(string eventName, EventReceiver *receiver)
                {
                        // get the list for this event
                        EventSwitch &s = EventSwitch::getInstance();
                        ibrcommon::MutexLock l(s._receiverlock);
                        s._list[eventName].remove( receiver );
                }

                void EventSwitch::raiseEvent(Event *evt)
                {
                        EventSwitch &s = EventSwitch::getInstance();
                        s._queue.push(evt);
                }

                EventSwitch& EventSwitch::getInstance()
                {
                        static EventSwitch instance;
                        return instance;
                }
        }
}

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