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/**
* @file
* @author 2012-2013 Stefan Radomski (stefan.radomski@cs.tu-darmstadt.de)
* @copyright Simplified BSD
*
* @cond
* This program is free software: you can redistribute it and/or modify
* it under the terms of the FreeBSD license as published by the FreeBSD
* project.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the FreeBSD license along with this
* program. If not, see <http://www.opensource.org/licenses/bsd-license>.
* @endcond
*/
#include "DelayedEventQueue.h"
#include "uscxml/messages/Event.h"
#include <glog/logging.h>
#include <event2/event.h>
#include "event2/thread.h"
namespace uscxml {
DelayedEventQueue::DelayedEventQueue() {
#ifndef _WIN32
evthread_use_pthreads();
#else
evthread_use_windows_threads();
#endif
_eventLoop = event_base_new();
_thread = NULL;
_isStarted = false;
}
DelayedEventQueue::~DelayedEventQueue() {
// std::cout << "Deleting DelayedEventQueue" << std::endl;
stop();
if (_thread && _isStarted)
_thread->join();
if(_eventLoop)
event_base_free(_eventLoop);
}
void DelayedEventQueue::run(void* instance) {
DelayedEventQueue* INSTANCE = (DelayedEventQueue*)instance;
int result;
while(INSTANCE->_isStarted) {
// #ifndef EVLOOP_NO_EXIT_ON_EMPTY
// result = event_base_dispatch(INSTANCE->_eventLoop);
// #else
result = event_base_loop(INSTANCE->_eventLoop, EVLOOP_NO_EXIT_ON_EMPTY);
//#endif
(void)result;
}
}
void DelayedEventQueue::addEvent(std::string eventId, int fd, short opMask, void (*callback)(void*, const std::string eventId), void* userData, bool persist) {
if(_callbackData.find(eventId) != _callbackData.end()) {
cancelEvent(eventId);
}
if (persist)
opMask |= EV_PERSIST;
struct event* event = event_new(_eventLoop, fd, opMask, DelayedEventQueue::fileCallback, &_callbackData[eventId]);
_callbackData[eventId].eventId = eventId;
_callbackData[eventId].userData = userData;
_callbackData[eventId].eventQueue = this;
_callbackData[eventId].callback = callback;
_callbackData[eventId].event = event;
_callbackData[eventId].persist = false;
event_add(event, NULL);
}
void DelayedEventQueue::addEvent(std::string eventId, void (*callback)(void*, const std::string eventId), uint32_t delayMs, void* userData, bool persist) {
if(_callbackData.find(eventId) != _callbackData.end()) {
cancelEvent(eventId);
}
struct timeval delay = {delayMs / 1000, (delayMs % 1000) * 1000};
struct event* event = event_new(_eventLoop, -1, (persist ? EV_PERSIST : 0), DelayedEventQueue::timerCallback, &_callbackData[eventId]);
_callbackData[eventId].eventId = eventId;
_callbackData[eventId].userData = userData;
_callbackData[eventId].eventQueue = this;
_callbackData[eventId].callback = callback;
_callbackData[eventId].event = event;
_callbackData[eventId].persist = persist;
event_add(event, &delay);
}
void DelayedEventQueue::cancelAllEvents() {
tthread::lock_guard<tthread::recursive_mutex> lock(_mutex);
while(_callbackData.size() > 0) {
event_del(_callbackData[_callbackData.begin()->first].event);
event_free(_callbackData[_callbackData.begin()->first].event);
_callbackData.erase(_callbackData.begin());
}
}
void DelayedEventQueue::cancelEvent(std::string eventId) {
tthread::lock_guard<tthread::recursive_mutex> lock(_mutex);
if(_callbackData.find(eventId) != _callbackData.end()) {
event_del(_callbackData[eventId].event);
event_free(_callbackData[eventId].event);
_callbackData.erase(eventId);
}
}
void DelayedEventQueue::start() {
_isStarted = true;
_thread = new tthread::thread(DelayedEventQueue::run, this);
}
void DelayedEventQueue::stop() {
if (_isStarted) {
_isStarted = false;
event_base_loopbreak(_eventLoop);
}
if (_thread) {
_thread->join();
delete _thread;
_thread = NULL;
}
}
void DelayedEventQueue::dummyCallback(evutil_socket_t fd, short what, void *arg) {
}
void DelayedEventQueue::fileCallback(evutil_socket_t fd, short what, void *arg) {
struct callbackData *data = (struct callbackData*)arg;
tthread::lock_guard<tthread::recursive_mutex> lock(data->eventQueue->_mutex);
std::string eventId = data->eventId; // copy eventId
data->callback(data->userData, eventId);
}
void DelayedEventQueue::timerCallback(evutil_socket_t fd, short what, void *arg) {
struct callbackData *data = (struct callbackData*)arg;
tthread::lock_guard<tthread::recursive_mutex> lock(data->eventQueue->_mutex);
std::string eventId = data->eventId; // copy eventId
try {
data->callback(data->userData, eventId);
} catch (Event e) {
LOG(ERROR) << "Exception thrown when executing delayed event:" << std::endl << e << std::endl;
} catch (...) {
LOG(ERROR) << "Exception thrown when executing delayed event" << std::endl;
}
if (!data->persist) {
event_free(data->event);
data->eventQueue->_callbackData.erase(data->eventId);
}
}
}
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