//---------------------------------------------------------------------------------------------------------------------
// EventManager::VTick
//---------------------------------------------------------------------------------------------------------------------
bool EventManager::VUpdate(unsigned long maxMillis)
{
unsigned long currMs = GetTickCount();
unsigned long maxMs = ((maxMillis == IEventManager::kINFINITE) ? (IEventManager::kINFINITE) : (currMs + maxMillis));
// This section added to handle events from other threads. Check out Chapter 20.
IEventDataPtr pRealtimeEvent;
while (m_realtimeEventQueue.try_pop(pRealtimeEvent))
{
VQueueEvent(pRealtimeEvent);
currMs = GetTickCount();
if (maxMillis != IEventManager::kINFINITE)
{
if (currMs >= maxMs)
{
GCC_ERROR("A realtime process is spamming the event manager!");
}
}
}
// swap active queues and clear the new queue after the swap
int queueToProcess = m_activeQueue;
m_activeQueue = (m_activeQueue + 1) % EVENTMANAGER_NUM_QUEUES;
m_queues[m_activeQueue].clear();
GCC_LOG("EventLoop", "Processing Event Queue " + ToStr(queueToProcess) + "; " + ToStr((unsigned long)m_queues[queueToProcess].size()) + " events to process");
// Process the queue
while (!m_queues[queueToProcess].empty())
{
// pop the front of the queue
IEventDataPtr pEvent = m_queues[queueToProcess].front();
m_queues[queueToProcess].pop_front();
GCC_LOG("EventLoop", "\t\tProcessing Event " + std::string(pEvent->GetName()));
const EventType& eventType = pEvent->VGetEventType();
// find all the delegate functions registered for this event
auto findIt = m_eventListeners.find(eventType);
if (findIt != m_eventListeners.end())
{
const EventListenerList& eventListeners = findIt->second;
GCC_LOG("EventLoop", "\t\tFound " + ToStr((unsigned long)eventListeners.size()) + " delegates");
// call each listener
for (auto it = eventListeners.begin(); it != eventListeners.end(); ++it)
{
EventListenerDelegate listener = (*it);
GCC_LOG("EventLoop", "\t\tSending event " + std::string(pEvent->GetName()) + " to delegate");
listener(pEvent);
}
}
// check to see if time ran out
currMs = GetTickCount();
if (maxMillis != IEventManager::kINFINITE && currMs >= maxMs)
{
GCC_LOG("EventLoop", "Aborting event processing; time ran out");
break;
}
}
// If we couldn't process all of the events, push the remaining events to the new active queue.
// Note: To preserve sequencing, go back-to-front, inserting them at the head of the active queue
bool queueFlushed = (m_queues[queueToProcess].empty());
if (!queueFlushed)
{
while (!m_queues[queueToProcess].empty())
{
IEventDataPtr pEvent = m_queues[queueToProcess].back();
m_queues[queueToProcess].pop_back();
m_queues[m_activeQueue].push_front(pEvent);
}
}
return queueFlushed;
}
//
// EventManager::VTick - Chapter 10, page 296
// EventManager::VTick - Chapter 18, page 671 (for the threadsafe stuff)
//
// Allow for processing of any queued messages, optionally
// specify a processing time limit so that the event processing
// does not take too long. Note the danger of using this
// artificial limiter is that all messages may not in fact get
// processed.
//
// returns true if all messages ready for processing were
// completed, false otherwise (e.g. timeout )
//
bool EventManager::VTick ( unsigned long maxMillis )
{
unsigned long curMs = GetTickCount();
unsigned long maxMs =
maxMillis == IEventManager::kINFINITE
? IEventManager::kINFINITE
: (curMs + maxMillis );
EventListenerMap::const_iterator itWC = m_registry.find( 0 );
// This section added to handle events from other threads
// Check out Chapter 18
// --------------------------------------------------------
IEventDataPtr rte;
while (m_RealtimeEventQueue.try_pop(rte))
{
VQueueEvent(rte);
curMs = GetTickCount();
if ( maxMillis != IEventManager::kINFINITE )
{
if ( curMs >= maxMs )
{
assert(0 && "A realtime process is spamming the event manager!");
}
}
}
// --------------------------------------------------------
// swap active queues, make sure new queue is empty after the
// swap ...
int queueToProcess = m_activeQueue;
m_activeQueue = ( m_activeQueue + 1 ) % kNumQueues;
m_queues[m_activeQueue].clear();
// now process as many events as we can ( possibly time
// limited ) ... always do AT LEAST one event, if ANY are
// available ...
while ( m_queues[queueToProcess].size() > 0 )
{
IEventDataPtr event = m_queues[queueToProcess].front();
m_queues[queueToProcess].pop_front();
EventType const & eventType = event->VGetEventType();
EventListenerMap::const_iterator itListeners =
m_registry.find( eventType.getHashValue() );
if ( itWC != m_registry.end() )
{
EventListenerTable const & table = itWC->second;
bool processed = false;
for ( EventListenerTable::const_iterator
it2 = table.begin(), it2End = table.end();
it2 != it2End; it2++ )
{
(*it2)->HandleEvent( *event );
}
}
// no listerners currently for this event type, skipit
if ( itListeners == m_registry.end() )
continue;
unsigned int const kEventId = itListeners->first;
EventListenerTable const & table = itListeners->second;
for ( EventListenerTable::const_iterator
it = table.begin(), end = table.end();
it != end ; it++ )
{
if ( (*it)->HandleEvent( *event ) )
{
break;
}
}
curMs = GetTickCount();
if ( maxMillis != IEventManager::kINFINITE )
{
if ( curMs >= maxMs )
{
// time ran about, abort processing loop
break;
}
}
}
// if any events left to process, push them onto the active
// queue.
//
// Note: to preserver sequencing, go bottom-up on the
// raminder, inserting them at the head of the active
// queue...
bool queueFlushed = ( m_queues[queueToProcess].size() == 0 );
if ( !queueFlushed )
{
while ( m_queues[queueToProcess].size() > 0 )
{
IEventDataPtr event = m_queues[queueToProcess].back();
m_queues[queueToProcess].pop_back();
m_queues[m_activeQueue].push_front( event );
}
}
// all done, this pass
return queueFlushed;
}
bool EventManager::VUpdate(unsigned long maxMs)
{
unsigned long curMs = GetTickCount();
unsigned long computedMaxMs = (maxMs == IEventManager::kINFINITE ? IEventManager::kINFINITE : curMs + maxMs);
EventDataPtr pRealtimeEvent;
while (m_realtimeEventQueue.try_pop(pRealtimeEvent))
{
VQueueEvent(pRealtimeEvent);
curMs = GetTickCount();
if (maxMs != IEventManager::kINFINITE)
{
if (curMs >= computedMaxMs) {
BE_ERROR("Realtime Proccess is spamming Event Manager!");
}
}
}
int queueToProcess = m_activeQueue;
m_activeQueue = (m_activeQueue + 1) % EVENTMANAGER_NUM_QUEUES;
m_queues[m_activeQueue].clear();
while (!m_queues[queueToProcess].empty())
{
EventDataPtr pEvent = m_queues[queueToProcess].front();
m_queues[queueToProcess].pop_front();
const EventType& eventType = pEvent->VGetEventType();
auto findIt = m_eventListeners.find(eventType);
if (findIt != m_eventListeners.end())
{
const EventListenerList& eventListeners = findIt->second;
for (auto it = eventListeners.begin(); it != eventListeners.end(); it++)
{
EventListenerDelegate listener = (*it);
listener(pEvent);
}
}
curMs = GetTickCount();
if (maxMs != IEventManager::kINFINITE && curMs >= computedMaxMs)
{
//Abort, ran out of time
break;
}
}
//If couldnt process all, push remaining to new active queue
bool queueFlushed = m_queues[queueToProcess].empty();
if (!queueFlushed)
{
while (!m_queues[queueToProcess].empty())
{
EventDataPtr pEvent = m_queues[queueToProcess].back();
m_queues[queueToProcess].pop_back();
m_queues[m_activeQueue].push_front(pEvent);
}
}
return queueFlushed;
}
