source: source/ariba/utility/system/SystemQueue.cpp@ 4712

// [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,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// official policies, either expressed or implied, of the Institute of
// 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
}

void SystemQueue::enterMethod(){
        // TODO: omnet case and delay scheduler
        directScheduler.enter();
}

void SystemQueue::leaveMethod(){
        // TODO: omnet case and delay scheduler
        directScheduler.leave();
}

//***************************************************************
#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
        {
                // get the lock, when we got the lock the 
                // queue thread must be in itemsAvailable.wait()
                boost::mutex::scoped_lock lock(queueMutex);
                
                // set the running indicator and signal to run on
                // this will run the thread and quit it
                running = false;
                itemsAvailable.notify_all();
        }

        // wait until the thread has exited
        queueThread->join();

        // delete pending events
        while( eventsQueue.size() > 0 ){
                eventsQueue.erase( eventsQueue.begin() );
        }

        // delete the thread, so that a subsuquent run() can be called
        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->running && obj->eventsQueue.empty() ){

//                      const boost::system_time duration =
//                                      boost::get_system_time() +
//                                      boost::posix_time::milliseconds(100);
//                      obj->itemsAvailable.timed_wait( lock, duration );

                        obj->itemsAvailable.wait( lock );
                }

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

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

                        // 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");
}

void SystemQueue::QueueThread::enter(){
        queueMutex.lock();
}

void SystemQueue::QueueThread::leave(){
        queueMutex.unlock();
}


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

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