source: source/ariba/utility/system/SystemQueue.cpp@ 4626

// [License]

// The Ariba-Underlay Copyright

//

// Copyright (c) 2008-2009, Institute of Telematics, UniversitÀt Karlsruhe (TH)

//

// Institute of Telematics

// UniversitÀt Karlsruhe (TH)

// Zirkel 2, 76128 Karlsruhe

// Germany

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

//

// 1. Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// 2. Redistributions in binary form must reproduce the above copyright

// notice, this list of conditions and the following disclaimer in the

// documentation and/or other materials provided with the distribution.

//

// THIS SOFTWARE IS PROVIDED BY THE INSTITUTE OF TELEMATICS ``AS IS'' AND

// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE ARIBA PROJECT OR

// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

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// Telematics.



#include "SystemQueue.h"



namespace ariba {

namespace utility {



use_logging_cpp(SystemQueue);



SystemQueue::SystemQueue()

#ifndef UNDERLAY_OMNET

 : delayScheduler( &directScheduler ), systemQueueRunning( false )

#endif

{

}



SystemQueue::~SystemQueue() {

}



void SystemQueue::scheduleEvent( const SystemEvent& event, uint32_t delay ) {

#ifndef UNDERLAY_OMNET

        if( delay == 0 ) directScheduler.insert( event, delay );

        else delayScheduler.insert ( event, delay );

#else

        Enter_Method_Silent();

        cMessage* msg = new cMessage();

        msg->setContextPointer( new SystemEvent(event) );



        if( delay == 0 )

                cSimpleModule::scheduleAt( cSimpleModule::simTime(), msg );

        else

                cSimpleModule::scheduleAt( cSimpleModule::simTime()+((double)delay/1000.0), msg );

#endif

}



#ifdef UNDERLAY_OMNET

void SystemQueue::handleMessage(cMessage* msg){

        SystemEvent* event = (SystemEvent*)msg->contextPointer();



        event->listener->handleSystemEvent( *event );



        delete event; delete msg;

}

#endif



void SystemQueue::run() {

#ifndef UNDERLAY_OMNET

        systemQueueRunning = true;

        directScheduler.run();

        delayScheduler.run();

#endif

}



void SystemQueue::cancel() {

#ifndef UNDERLAY_OMNET

        systemQueueRunning = false;

        directScheduler.cancel();

        delayScheduler.cancel();

#endif

}



bool SystemQueue::isEmpty() {

#ifndef UNDERLAY_OMNET

        return directScheduler.isEmpty() || delayScheduler.isEmpty();

#else

        return false;

#endif

}



bool SystemQueue::isRunning() {

#ifndef UNDERLAY_OMNET

        return systemQueueRunning;

#else

        return true;

#endif

}



//***************************************************************

#ifndef UNDERLAY_OMNET



SystemQueue::QueueThread::QueueThread(QueueThread* _transferQueue)

        : running( false ), transferQueue( _transferQueue ) {

}



SystemQueue::QueueThread::~QueueThread(){

}



void SystemQueue::QueueThread::run(){

        running = true;

        queueThread = new boost::thread(

                boost::bind(&QueueThread::threadFunc, this) );

}



void SystemQueue::QueueThread::cancel(){



        // cause the thread to exit

        {

                boost::mutex::scoped_lock lock(queueMutex);

                running = false;



                while( eventsQueue.size() > 0 ){

                        eventsQueue.erase( eventsQueue.begin() );

                }



                itemsAvailable.notify_all();

        }



        // wait that the thread has exited

        // and delete it, so that a subsuquent run() can be called



        queueThread->join();

        delete queueThread;

        queueThread = NULL;

}



bool SystemQueue::QueueThread::isEmpty(){

        boost::mutex::scoped_lock lock( queueMutex );

        return eventsQueue.empty();

}



void SystemQueue::QueueThread::insert( const SystemEvent& event, uint32_t delay ){



        // if this is called from a module that is currently handling

        // a thread (called from SystemQueue::onNextQueueItem), the

        // thread is the same anyway and the mutex will be already

        // aquired, otherwise we aquire it now



        boost::mutex::scoped_lock lock( queueMutex );



        eventsQueue.push_back( event );

        eventsQueue.back().scheduledTime = boost::posix_time::microsec_clock::local_time();

        eventsQueue.back().delayTime = delay;

        eventsQueue.back().remainingDelay = delay;



        onItemInserted( event );

        itemsAvailable.notify_all();

}



void SystemQueue::QueueThread::threadFunc( QueueThread* obj ) {



        boost::mutex::scoped_lock lock( obj->queueMutex );



        while( obj->running ) {



                // wait until an item is in the queue or we are notified

                // to quit the thread. in case the thread is about to

                // quit, the queueThreadRunning variable will indicate

                // this and cause the thread to exit



                while ( obj->eventsQueue.empty() && obj->running ){



//                      const boost::system_time duration =

//                                      boost::get_system_time() +

//                                      boost::posix_time::milliseconds(100);



                        obj->itemsAvailable.wait( lock );

//                      obj->itemsAvailable.timed_wait( lock, duration );

                }



                //

                // work all the items that are currently in the queue

                //



                while( !obj->eventsQueue.empty() && obj->running ) {



                        // fetch the first item in the queue

                        // and deliver it to the queue handler

                        SystemEvent ev = obj->eventsQueue.front();

                        obj->eventsQueue.erase( obj->eventsQueue.begin() );



                        // call the queue and this will

                        // call the actual event handler

                        obj->onNextQueueItem( ev );



                } // !obj->eventsQueue.empty() )

        } // while (obj->running)



        logging_debug("system queue exited");

}



//***************************************************************



SystemQueue::QueueThreadDirect::QueueThreadDirect(){

}



SystemQueue::QueueThreadDirect::~QueueThreadDirect(){

}



void SystemQueue::QueueThreadDirect::onItemInserted( const SystemEvent& event ){

        // do nothing here

}



void SystemQueue::QueueThreadDirect::onNextQueueItem( const SystemEvent& event ){

        // directly deliver the item to the

        event.getListener()->handleSystemEvent( event );

}



//***************************************************************



SystemQueue::QueueThreadDelay::QueueThreadDelay(QueueThread* _transferQueue)

        : QueueThread( _transferQueue ), isSleeping( false ) {



        assert( _transferQueue != NULL );

}



SystemQueue::QueueThreadDelay::~QueueThreadDelay(){

}



void SystemQueue::QueueThreadDelay::onItemInserted( const SystemEvent& event ){



        if( !isSleeping) return;



        // break an existing sleep and

        // remember the time that was actually slept for

        // and change it for every event in the queue



        assert( !eventsQueue.empty());

        sleepCond.notify_all();



        ptime sleepEnd = boost::posix_time::microsec_clock::local_time();

        boost::posix_time::time_duration duration = sleepEnd - sleepStart;

        uint32_t sleptTime = duration.total_milliseconds();



        EventQueue::iterator i = eventsQueue.begin();

        EventQueue::iterator iend = eventsQueue.end();



        for( ; i != iend; i++ ) {



                if( sleptTime >= i->remainingDelay)

                        i->remainingDelay = 0;

                else

                        i->remainingDelay -= sleptTime;



        } // for( ; i != iend; i++ )



        // now we have to reorder the events

        // in the queue with respect to their remaining delay

        // the SystemQueue::operator< takes care of the

        // ordering with respect to the remaining delay



        std::sort( eventsQueue.begin(), eventsQueue.end() );



}



void SystemQueue::QueueThreadDelay::onNextQueueItem( const SystemEvent& event ){



        // sleeps will be cancelled in the

        // onItemInserted function when a new

        // event arrives during sleeping



        assert( !isSleeping );



        // the given item is the one with the least

        // amount of sleep time left. because all

        // items are reordered in onItemInserted



        if( event.remainingDelay > 0 ) {



                const boost::system_time duration =

                        boost::get_system_time() +

                        boost::posix_time::milliseconds(event.remainingDelay);



                {

                        boost::unique_lock<boost::mutex> lock( sleepMutex );



                        sleepStart = boost::posix_time::microsec_clock::local_time();

                        isSleeping = true;



                        sleepCond.timed_wait( lock, duration );



                        isSleeping = false;

                }



        } // if( event.remainingDelay > 0 )



        // if the sleep succeeded and was not

        // interrupted by a new incoming item

        // we can now deliver this event



        ptime sleepEnd = boost::posix_time::microsec_clock::local_time();

        boost::posix_time::time_duration duration = sleepEnd - sleepStart;

        uint32_t sleptTime = duration.total_milliseconds();



        if (event.remainingDelay <= sleptTime)

                transferQueue->insert( event, 0 );

}



#endif // #ifndef UNDERLAY_OMNET



//***************************************************************



}} // spovnet, common