bool EventManager::QueueEvent(const IEventPtr& pEvent)
{
CB_ASSERT(m_ActiveQueue >= 0);
CB_ASSERT(m_ActiveQueue < EVENTMANAGER_NUM_QUEUES);
if (!pEvent)
{
CB_ERROR("Invalid Event");
return false;
}
CB_LOG("Events", "Attempting to queue event: " + std::string(pEvent->GetName()));
// make sure there are listeners for this event
auto findIt = m_EventListeners.find(pEvent->GetEventType());
if (findIt != m_EventListeners.end())
{
m_Queues[m_ActiveQueue].push_back(pEvent);
CB_LOG("Events", "Successfully queued event: " + std::string(pEvent->GetName()));
return true;
}
else
{
CB_LOG("Events", "No listeners for event: " + std::string(pEvent->GetName()));
return false;
}
}
bool EventManager::TriggerEvent(const IEventPtr& pEvent) const
{
CB_LOG("Events", "Attempting to trigger event " + std::string(pEvent->GetName()));
bool processed = false;
// iterate the map looking for this event type
auto findIt = m_EventListeners.find(pEvent->GetEventType());
if (findIt != m_EventListeners.end())
{
// iterate the listener list and send the event to each listener
const EventListenerList& listeners = findIt->second;
for (EventListenerList::const_iterator it = listeners.begin(); it != listeners.end(); ++it)
{
EventListenerDelegate listener = (*it);
CB_LOG("Events", "Sending event " + std::string(pEvent->GetName()) + " to delegate listener.");
listener(pEvent);
processed = true;
}
}
return processed;
}
bool EventManager::Update(unsigned long maxMillis)
{
unsigned long currMS = GetTickCount();
// set the max milliseconds to process events
unsigned long maxMS = (maxMillis == IEventManager::kINFINITE) ? IEventManager::kINFINITE : currMS + maxMillis;
// handle events from other threads
IEventPtr pRealtimeEvent;
while (m_RealTimeEventQueue.try_pop(pRealtimeEvent))
{
QueueEvent(pRealtimeEvent);
currMS = GetTickCount();
if (maxMillis != IEventManager::kINFINITE)
{
if (currMS >= maxMS)
{
CB_ERROR("Too many real time processes hitting the event manager");
}
}
}
// swap active queues and clear the new active after the swap
int queueToProcess = m_ActiveQueue;
m_ActiveQueue = (m_ActiveQueue + 1) % EVENTMANAGER_NUM_QUEUES;
m_Queues[m_ActiveQueue].clear();
CB_LOG("EventLoop", "Processing Event Queue " + ToStr(queueToProcess) + "; " + ToStr((unsigned long)m_Queues[queueToProcess].size()) + " events to process");
// process the queue of events
while (!m_Queues[queueToProcess].empty())
{
// process the first event and pop it
IEventPtr pEvent = m_Queues[queueToProcess].front();
m_Queues[queueToProcess].pop_front();
CB_LOG("EventLoop", "\t\tProcessing Event " + std::string(pEvent->GetName()));
const EventType& eventType = pEvent->GetEventType();
// find all the listeners registered for this event in the map
auto findIt = m_EventListeners.find(eventType);
if (findIt != m_EventListeners.end())
{
// get the list of listeners
const EventListenerList& listeners = findIt->second;
CB_LOG("Event Loop", "\t\tFound " + ToStr((unsigned long)listeners.size()) + " listeners");
// call each listener for this event type
for (auto it = listeners.begin(); it != listeners.end(); ++it)
{
EventListenerDelegate listener = *it;
CB_LOG("EventLoop", "\t\tSending event " + std::string(pEvent->GetName()) + " to listener");
listener(pEvent);
}
}
// check to see if time ran out
currMS = GetTickCount();
if (maxMillis != IEventManager::kINFINITE && currMS >= maxMS)
{
CB_LOG("EventLoop", "Aborting event processing, time ran out");
break;
}
}
bool queueFlushed = m_Queues[queueToProcess].empty();
// if we couldn't process all events, push remaining events on the new active queue
if (!queueFlushed)
{
while (!m_Queues[queueToProcess].empty())
{
IEventPtr pEvent = m_Queues[queueToProcess].back();
m_Queues[queueToProcess].pop_back();
m_Queues[m_ActiveQueue].push_front(pEvent);
}
}
return queueFlushed;
}