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/*
* Copyright (c) 2010-2016 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/bind.hpp>
#include <boost/lambda/bind.hpp>
#include <boost/lambda/lambda.hpp>
#include <boost/optional.hpp>
#include <Swiften/Base/Log.h>
#include <Swiften/Base/foreach.h>
namespace lambda = boost::lambda;
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() << std::endl;
}
catch (...) {
SWIFT_LOG(error) << "Uncaught non-exception in event loop" << std::endl;
}
}
EventLoop::EventLoop() : nextEventID_(0), handlingEvents_(false) {
}
EventLoop::~EventLoop() {
}
void EventLoop::handleNextEvents() {
const int eventsBatched = 100;
// If handleNextEvents 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_);
{
std::vector<Event> nextEvents;
{
std::unique_lock<std::recursive_mutex> lock(eventsMutex_);
for (int n = 0; ((n < eventsBatched) && !events_.empty()); n++) {
nextEvents.push_back(events_.front());
events_.pop_front();
}
callEventPosted = !events_.empty();
}
if (!nextEvents.empty()) {
foreach (const Event& event, nextEvents) {
invokeCallback(event);
}
}
}
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(lambda::bind(&Event::owner, lambda::_1) == owner);
}
}
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Swift