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/*
Copyright (c) 2017, Ford Motor Company
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following
disclaimer in the documentation and/or other materials provided with the
distribution.
Neither the name of the Ford Motor Company nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SRC_COMPONENTS_REMOTE_CONTROL_INCLUDE_REMOTE_CONTROL_EVENT_ENGINE_EVENT_DISPATCHER_H_
#define SRC_COMPONENTS_REMOTE_CONTROL_INCLUDE_REMOTE_CONTROL_EVENT_ENGINE_EVENT_DISPATCHER_H_
#include <list>
#include <map>
#include "utils/lock.h"
#include "remote_control/event_engine/event.h"
#include "remote_control/event_engine/event_observer.h"
#include "interfaces/HMI_API.h"
namespace rc_event_engine {
template <typename EventMessage, typename EventID>
class Event;
template <typename EventMessage, typename EventID>
class EventObserver;
template <typename EventMessage, typename EventID>
class EventDispatcher {
public:
/**
* @brief Default constructor
*/
EventDispatcher();
/**
* @brief Destructor
*/
virtual ~EventDispatcher();
/*
* @brief Delivers the event to all subscribers
*
* @param event Received event
*/
void raise_event(const Event<EventMessage, EventID>& event);
/*
* @brief Subscribe the observer to event
*
* @param event_id The event ID to subscribe for
* @param hmi_correlation_id The event HMI correlation ID
* @param observer The observer to subscribe for event
*/
void add_observer(const EventID& event_id,
int32_t hmi_correlation_id,
EventObserver<EventMessage, EventID>* const observer);
/*
* @brief Unsubscribes the observer from specific event
*
* @param event_id The event ID to unsubscribe from
* @param observer The observer to be unsubscribed
*/
void remove_observer(
const EventID& event_id,
const EventObserver<EventMessage, EventID>* const observer);
/*
* @brief Unsubscribes the observer from all events
*
* @param observer The observer to be unsubscribed
*/
void remove_observer(
const EventObserver<EventMessage, EventID>* const observer);
protected:
private:
DISALLOW_COPY_AND_ASSIGN(EventDispatcher);
// Data types section
typedef std::list<EventObserver<EventMessage, EventID>*> ObserverList;
typedef std::map<int32_t, ObserverList> ObserversMap;
typedef std::map<EventID, ObserversMap> EventObserverMap;
// Members section
sync_primitives::Lock state_lock_;
EventObserverMap observers_;
};
template <typename EventMessage, typename EventID>
EventDispatcher<EventMessage, EventID>::EventDispatcher()
: observers_() {}
template <typename EventMessage, typename EventID>
EventDispatcher<EventMessage, EventID>::~EventDispatcher() {}
template <typename EventMessage, typename EventID>
void EventDispatcher<EventMessage, EventID>::raise_event(
const Event<EventMessage, EventID>& event) {
// create local list
ObserverList list;
{
sync_primitives::AutoLock auto_lock(state_lock_);
// check if event is notification
if (hmi_apis::messageType::notification == event.event_message_type()) {
// ObserversMap iterator
typename ObserversMap::iterator it = observers_[event.id()].begin();
for (; observers_[event.id()].end() != it; ++it) {
list = it->second;
}
}
if ((hmi_apis::messageType::response == event.event_message_type()) ||
(hmi_apis::messageType::error_response == event.event_message_type())) {
list = observers_[event.id()][event.event_message_correlation_id()];
}
}
// Call observers
typename ObserverList::iterator observers = list.begin();
for (; list.end() != observers; ++observers) {
(*observers)->on_event(event);
}
}
template <typename EventMessage, typename EventID>
void EventDispatcher<EventMessage, EventID>::add_observer(
const EventID& event_id,
int32_t hmi_correlation_id,
EventObserver<EventMessage, EventID>* const observer) {
sync_primitives::AutoLock auto_lock(state_lock_);
observers_[event_id][hmi_correlation_id].push_back(observer);
}
template <typename EventMessage, typename EventID>
void EventDispatcher<EventMessage, EventID>::remove_observer(
const EventID& event_id,
const EventObserver<EventMessage, EventID>* const observer) {
sync_primitives::AutoLock auto_lock(state_lock_);
typename ObserversMap::iterator it = observers_[event_id].begin();
for (; observers_[event_id].end() != it; ++it) {
// ObserverList iterator
typename ObserverList::iterator observer_it = it->second.begin();
while (it->second.end() != observer_it) {
if (observer->id() == (*observer_it)->id()) {
observer_it = it->second.erase(observer_it);
} else {
++observer_it;
}
}
}
}
template <typename EventMessage, typename EventID>
void EventDispatcher<EventMessage, EventID>::remove_observer(
const EventObserver<EventMessage, EventID>* const observer) {
sync_primitives::AutoLock auto_lock(state_lock_);
typename EventObserverMap::iterator event_map = observers_.begin();
for (; observers_.end() != event_map; ++event_map) {
typename ObserversMap::iterator it = event_map->second.begin();
for (; event_map->second.end() != it; ++it) {
// ObserverList iterator
typename ObserverList::iterator observer_it = it->second.begin();
while (it->second.end() != observer_it) {
if (observer->id() == (*observer_it)->id()) {
observer_it = it->second.erase(observer_it);
} else {
++observer_it;
}
}
}
}
}
}
#endif // SRC_COMPONENTS_REMOTE_CONTROL_INCLUDE_REMOTE_CONTROL_EVENT_ENGINE_EVENT_DISPATCHER_H_
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