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EventCallbackHandler.cpp
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143 lines (109 loc) · 4.45 KB
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/*
* EventCallbackHandler.cpp
* MWorksCore
*
* Created by David Cox on 12/9/09.
* Copyright 2009 Harvard University. All rights reserved.
*
*/
#include "EventCallbackHandler.h"
using namespace mw;
KeyedEventCallbackPair::KeyedEventCallbackPair(){
key = "<invalid>";
callback = shared_ptr<EventCallback>();
}
KeyedEventCallbackPair::KeyedEventCallbackPair(string _key, EventCallback _callback){
key = _key;
callback = shared_ptr<EventCallback>(new EventCallback(_callback));
}
void KeyedEventCallbackPair::operator=(const KeyedEventCallbackPair& cb_pair){
key = cb_pair.key;
callback = cb_pair.callback;
}
EventCallback KeyedEventCallbackPair::getCallback(){
if(callback != NULL){
return *callback;
} else {
return boost::bind(&KeyedEventCallbackPair::dummyCallback, shared_from_this(), _1);
}
}
string KeyedEventCallbackPair::getKey(){ return key; }
void KeyedEventCallbackPair::dummyCallback(shared_ptr<Event> evt){
merror(M_SYSTEM_MESSAGE_DOMAIN, "Attempt to call an invalid callback functor");
}
void EventCallbackHandler::lock_callbacks(){
if(recursively_lock_callbacks){
recursive_callbacks_lock.lock();
} else {
callbacks_lock.lock();
}
}
void EventCallbackHandler::unlock_callbacks(){
if(recursively_lock_callbacks){
recursive_callbacks_lock.unlock();
} else {
callbacks_lock.unlock();
}
}
void EventCallbackHandler::handleCallbacks(shared_ptr<Event> evt){
if(evt == NULL){
return;
}
int code = evt->getEventCode();
//std::cerr << "handleCallbacks called in: " << this << " with event code " << code << std::endl;
pair<EventCallbackMap::iterator, EventCallbackMap::iterator> itp;
EventCallbackMap::iterator callback_iterator;
lock_callbacks();
// issue any "always" callbacks
// TODO: this can be made more efficient (e.g. search doesn't always need to be done)
itp = callbacks_by_code.equal_range(ALWAYS_CALLBACK);
for(callback_iterator = itp.first; callback_iterator != itp.second; ++callback_iterator){
KeyedEventCallbackPair callback_pair = (*callback_iterator).second;
EventCallback callback = (*callback_iterator).second.getCallback();
callback(evt);
}
// Issue callbacks registered for particular codes
itp = callbacks_by_code.equal_range(code);
for(callback_iterator = itp.first; callback_iterator != itp.second; ++callback_iterator){
KeyedEventCallbackPair callback_pair = (*callback_iterator).second;
EventCallback callback = (*callback_iterator).second.getCallback();
callback(evt);
//std::cerr << "callback called for evt: " << code << " in: " << this << std::endl;
}
unlock_callbacks();
}
void EventCallbackHandler::registerCallback(EventCallback cb, string callback_key){
registerCallback(ALWAYS_CALLBACK, cb, callback_key);
}
void EventCallbackHandler::registerCallback(int code, EventCallback cb, string callback_key){
lock_callbacks();
//std::cerr << "Registering callback for code: " << code << ", key: " << callback_key << std::endl;
callbacks_by_code.insert(pair< int, KeyedEventCallbackPair >(code, KeyedEventCallbackPair(callback_key, cb)));
codes_by_key.insert( pair<string, int>(callback_key, code) );
unlock_callbacks();
}
void EventCallbackHandler::unregisterCallbacksNoLocking(const std::string &key){
return unregisterCallbacks(key, false);
}
void EventCallbackHandler::unregisterCallbacks(const std::string &key, bool locked) {
if(locked){
lock_callbacks();
}
//std::cerr << "Unregistering callbacks for key: " << key << std::endl;
// For now, just do a straight linear time search
EventCallbackMap::iterator callback_iterator;
vector<EventCallbackMap::iterator> nodes_to_erase;
for(callback_iterator = callbacks_by_code.begin(); callback_iterator != callbacks_by_code.end(); ++callback_iterator){
if((*callback_iterator).second.getKey() == key){
//std::cerr << "\tunregistering code: " << (*callback_iterator).first << std::endl;
nodes_to_erase.push_back(callback_iterator);
}
}
vector<EventCallbackMap::iterator>::iterator erase_iterator;
for(erase_iterator = nodes_to_erase.begin(); erase_iterator != nodes_to_erase.end(); ++erase_iterator){
callbacks_by_code.erase(*erase_iterator);
}
if(locked){
unlock_callbacks();
}
}