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// Copyright (C) 2013-2020 Bayerische Motoren Werke Aktiengesellschaft (BMW AG)
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
#if !defined (COMMONAPI_INTERNAL_COMPILATION)
#error "Only <CommonAPI/CommonAPI.hpp> can be included directly, this file may disappear or change contents."
#endif
#ifndef COMMONAPI_DBUS_DBUSMULTIEVENT_HPP_
#define COMMONAPI_DBUS_DBUSMULTIEVENT_HPP_
#include <string>
#include <unordered_map>
#include <CommonAPI/Event.hpp>
namespace CommonAPI {
namespace DBus {
template <typename... Arguments_>
class DBusMultiEvent {
public:
typedef std::function<SubscriptionStatus(const std::string&, const Arguments_&...)> Listener;
typedef std::unordered_multimap<std::string, Listener> ListenersMap;
typedef typename ListenersMap::iterator Subscription;
virtual ~DBusMultiEvent() {}
Subscription subscribeAll(const Listener& listener);
Subscription subscribe(const std::string& eventName, const Listener& listener);
void unsubscribe(Subscription listenerSubscription);
protected:
SubscriptionStatus notifyListeners(const std::string& name, const Arguments_&... eventArguments);
virtual void onFirstListenerAdded(const std::string& name, const Listener& listener) { }
virtual void onListenerAdded(const std::string& name, const Listener& listener) { }
virtual void onListenerRemoved(const std::string& name, const Listener& listener) { }
virtual void onLastListenerRemoved(const std::string& name, const Listener& listener) { }
private:
typedef std::pair<typename ListenersMap::iterator, typename ListenersMap::iterator> IteratorRange;
SubscriptionStatus notifyListenersRange(const std::string& name, IteratorRange listenersRange, const Arguments_&... eventArguments);
ListenersMap listenersMap_;
};
template <typename... Arguments_>
typename DBusMultiEvent<Arguments_...>::Subscription
DBusMultiEvent<Arguments_...>::subscribeAll(const Listener& listener) {
return subscribe(std::string(), listener);
}
template <typename... Arguments_>
typename DBusMultiEvent<Arguments_...>::Subscription
DBusMultiEvent<Arguments_...>::subscribe(const std::string& eventName, const Listener& listener) {
const bool firstListenerAdded = listenersMap_.empty();
auto listenerSubscription = listenersMap_.insert({eventName, listener});
if (firstListenerAdded) {
onFirstListenerAdded(eventName, listener);
}
onListenerAdded(eventName, listener);
return listenerSubscription;
}
template <typename... Arguments_>
void DBusMultiEvent<Arguments_...>::unsubscribe(Subscription listenerSubscription) {
const std::string name = listenerSubscription->first;
const Listener listener = listenerSubscription->second;
listenersMap_.erase(listenerSubscription);
onListenerRemoved(name, listener);
const bool lastListenerRemoved = listenersMap_.empty();
if (lastListenerRemoved)
onLastListenerRemoved(name, listener);
}
template <typename... Arguments_>
SubscriptionStatus DBusMultiEvent<Arguments_...>::notifyListeners(const std::string& name, const Arguments_&... eventArguments) {
const SubscriptionStatus subscriptionStatus = notifyListenersRange(name, listenersMap_.equal_range(name), eventArguments...);
if (subscriptionStatus == SubscriptionStatus::CANCEL)
return SubscriptionStatus::CANCEL;
return notifyListenersRange(name, listenersMap_.equal_range(std::string()), eventArguments...);
}
template <typename... Arguments_>
SubscriptionStatus DBusMultiEvent<Arguments_...>::notifyListenersRange(
const std::string& name,
IteratorRange listenersRange,
const Arguments_&... eventArguments) {
for (auto iterator = listenersRange.first; iterator != listenersRange.second; iterator++) {
const Listener& listener = iterator->second;
const SubscriptionStatus listenerSubcriptionStatus = listener(name, eventArguments...);
if (listenerSubcriptionStatus == SubscriptionStatus::CANCEL) {
auto listenerIterator = iterator;
listenersMap_.erase(listenerIterator);
}
}
return listenersMap_.empty() ? SubscriptionStatus::CANCEL : SubscriptionStatus::RETAIN;
}
} // namespace DBus
} // namespace CommonAPI
#endif // COMMONAPI_DBUS_DBUSMULTIEVENT_HPP_
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