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/*
* Copyright (c) 2010-2019 Isode Limited.
* All rights reserved.
* See the COPYING file for more information.
*/
#include <Swiften/EventLoop/EventLoop.h>
#include <algorithm>
#include <cassert>
#include <vector>
#include <boost/optional.hpp>
#include <Swiften/Base/Log.h>
namespace Swift {
inline void invokeCallback(const Event& event) {
try {
assert(!event.callback.empty());
event.callback();
}
catch (const std::exception& e) {
SWIFT_LOG(error) << "Uncaught exception in event loop: " << e.what();
}
catch (...) {
SWIFT_LOG(error) << "Uncaught non-exception in event loop";
}
}
EventLoop::EventLoop() : nextEventID_(0), handlingEvents_(false) {
}
EventLoop::~EventLoop() {
}
void EventLoop::handleNextEvent() {
// If handleNextEvent is already in progress, e.g. in case of a recursive call due to
// the event loop implementation, then do no handle further events. Instead call
// eventPosted() to continue event handling later.
bool callEventPosted = handlingEvents_;
if (!handlingEvents_) {
handlingEvents_ = true;
std::unique_lock<std::recursive_mutex> lock(removeEventsMutex_);
{
boost::optional<Event> nextEvent;
{
std::unique_lock<std::recursive_mutex> eventsLock(eventsMutex_);
if (!events_.empty()) {
nextEvent = events_.front();
events_.pop_front();
}
callEventPosted = !events_.empty();
}
if (nextEvent) {
invokeCallback(*nextEvent);
}
}
handlingEvents_ = false;
}
if (callEventPosted) {
eventPosted();
}
}
void EventLoop::postEvent(boost::function<void ()> callback, std::shared_ptr<EventOwner> owner) {
Event event(owner, callback);
bool callEventPosted = false;
{
std::unique_lock<std::recursive_mutex> lock(eventsMutex_);
callEventPosted = events_.empty();
event.id = nextEventID_;
nextEventID_++;
events_.push_back(event);
}
if (callEventPosted) {
eventPosted();
}
}
void EventLoop::removeEventsFromOwner(std::shared_ptr<EventOwner> owner) {
std::unique_lock<std::recursive_mutex> removeLock(removeEventsMutex_, std::defer_lock);
std::unique_lock<std::recursive_mutex> eventsLock(eventsMutex_, std::defer_lock);
std::lock(removeLock, eventsLock);
events_.remove_if([&](const Event& event) {
return event.owner == owner;
});
}
}
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Swift