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/*
* Copyright (C) 2015, 2016 "IoT.bzh"
* Author "Romain Forlot" <romain.forlot@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* This is a classic observer design pattern a bit enhanced to be
able to pull and push info in 2 ways */
#include <list>
#include <mutex>
#include <algorithm>
template<class T>
class Observable;
template<class T>
class Observer
{
private:
std::mutex observableListMutex_;
protected:
virtual ~Observer()
{
std::lock_guard<std::mutex> lock(observableListMutex_);
for(const auto& sig: observableList_)
{
sig->delObserver(this);
}
}
std::list<Observable<T>*> observableList_;
typedef typename std::list<Observable<T>*>::iterator iterator_;
typedef typename std::list<Observable<T>*>::const_iterator const_iterator_;
public:
virtual void update(T* observable) = 0;
void addObservable(Observable<T>* observable)
{
std::lock_guard<std::mutex> lock(observableListMutex_);
for (auto& obs : observableList_)
{
if (obs == observable)
{return;}
}
observableList_.push_back(observable);
}
void delObservable(Observable<T>* observable)
{
std::lock_guard<std::mutex> lock(observableListMutex_);
const_iterator_ it = std::find(observableList_.cbegin(), observableList_.cend(), observable);
if(it != observableList_.cend())
{observableList_.erase(it);}
}
};
template <class T>
class Observable
{
public:
void addObserver(Observer<T>* observer)
{
std::lock_guard<std::mutex> lock(observerListMutex_);
observerList_.push_back(observer);
observer->addObservable(this);
}
void delObserver(Observer<T>* observer)
{
std::lock_guard<std::mutex> lock(observerListMutex_);
const_iterator_ it = find(observerList_.cbegin(), observerList_.cend(), observer);
if(it != observerList_.cend())
{observerList_.erase(it);}
}
virtual int initialRecursionCheck() = 0;
virtual int recursionCheck(T* obs) = 0;
virtual ~Observable()
{
std::lock_guard<std::mutex> lock(observerListMutex_);
for(const auto& obs: observerList_)
{
obs->delObservable(this);
}
}
protected:
std::list<Observer<T>*> observerList_;
typedef typename std::list<Observer<T>*>::iterator iterator_;
typedef typename std::list<Observer<T>*>::const_iterator const_iterator_;
void notify()
{
std::lock_guard<std::mutex> lock(observerListMutex_);
for(const auto& obs: observerList_)
{
obs->update(static_cast<T*>(this));
}
}
private:
std::mutex observerListMutex_;
};
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