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/*
* Copyright (c) 2010 Remko Tronçon
* Licensed under the GNU General Public License v3.
* See Documentation/Licenses/GPLv3.txt for more information.
*/
#include <Swiften/EventLoop/EventLoop.h>
#include <algorithm>
#include <boost/bind.hpp>
#include <iostream>
#include <cassert>
#include <Swiften/Base/Log.h>
#include <boost/lambda/lambda.hpp>
#include <boost/lambda/bind.hpp>
namespace lambda = boost::lambda;
namespace Swift {
inline void invokeCallback(const Event& event) {
try {
assert(!event.callback.empty());
event.callback();
}
catch (const std::exception& e) {
std::cerr << "Uncaught exception in event loop: " << e.what() << std::endl;
}
catch (...) {
std::cerr << "Uncaught non-exception in event loop" << std::endl;
}
}
EventLoop::EventLoop() : nextEventID_(0), handlingEvents_(false) {
}
EventLoop::~EventLoop() {
}
void EventLoop::handleEvent(const Event& event) {
//SWIFT_LOG(debug) << "Handling event " << event.id << std::endl;
if (handlingEvents_) {
// We're being called recursively. Push in the list of events to
// handle in the parent handleEvent()
eventsToHandle_.push_back(event);
return;
}
bool doCallback = false;
{
boost::lock_guard<boost::mutex> lock(eventsMutex_);
std::list<Event>::iterator i = std::find(events_.begin(), events_.end(), event);
if (i != events_.end()) {
doCallback = true;
events_.erase(i);
}
}
if (doCallback) {
handlingEvents_ = true;
invokeCallback(event);
// Process events that were passed to handleEvent during the callback
// (i.e. through recursive calls of handleEvent)
while (!eventsToHandle_.empty()) {
Event nextEvent = eventsToHandle_.front();
eventsToHandle_.pop_front();
invokeCallback(nextEvent);
}
handlingEvents_ = false;
}
}
void EventLoop::postEvent(boost::function<void ()> callback, boost::shared_ptr<EventOwner> owner) {
Event event(owner, callback);
{
boost::lock_guard<boost::mutex> lock(eventsMutex_);
event.id = nextEventID_;
nextEventID_++;
events_.push_back(event);
}
//SWIFT_LOG(debug) << "Posting event " << event.id << std::endl;
post(event);
}
void EventLoop::removeEventsFromOwner(boost::shared_ptr<EventOwner> owner) {
boost::lock_guard<boost::mutex> lock(eventsMutex_);
events_.remove_if(lambda::bind(&Event::owner, lambda::_1) == owner);
}
}
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Swift