121 lines
2.6 KiB
C++
121 lines
2.6 KiB
C++
// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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#ifndef K4ADATASOURCE_H
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#define K4ADATASOURCE_H
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// System headers
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//
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// Library headers
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//
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#include <list>
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#include <mutex>
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// Project headers
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//
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#include "ik4aobserver.h"
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namespace k4aviewer
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{
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template<typename T> class K4ADataSource
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{
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public:
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K4ADataSource() = default;
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~K4ADataSource()
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{
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NotifyTermination();
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}
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K4ADataSource(K4ADataSource &) = delete;
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K4ADataSource(K4ADataSource &&) = delete;
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K4ADataSource &operator=(K4ADataSource &) = delete;
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K4ADataSource &operator=(K4ADataSource &&) = delete;
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void RegisterObserver(std::shared_ptr<IK4AObserver<T>> &&observer)
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{
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std::lock_guard<std::mutex> lock(m_mutex);
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if (m_primed)
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{
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observer->NotifyData(m_mostRecentData);
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}
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m_observers.emplace_back(std::move(observer));
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}
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void NotifyObservers(const T &data)
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{
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std::lock_guard<std::mutex> lock(m_mutex);
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m_mostRecentData = data;
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m_primed = true;
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for (auto wpObserver = m_observers.begin(); wpObserver != m_observers.end();)
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{
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auto spObserver = wpObserver->lock();
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if (spObserver)
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{
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spObserver->NotifyData(data);
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++wpObserver;
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}
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else
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{
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auto toDelete = wpObserver;
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++wpObserver;
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m_observers.erase(toDelete);
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}
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}
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}
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void NotifyTermination()
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{
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std::lock_guard<std::mutex> lock(m_mutex);
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m_primed = false;
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m_mostRecentData = T();
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for (const auto &wpObserver : m_observers)
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{
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if (auto spObserver = wpObserver.lock())
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{
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spObserver->NotifyTermination();
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}
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}
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m_observers.clear();
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}
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void ClearData()
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{
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std::lock_guard<std::mutex> lock(m_mutex);
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m_primed = false;
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m_mostRecentData = T();
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for (auto wpObserver = m_observers.begin(); wpObserver != m_observers.end();)
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{
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auto spObserver = wpObserver->lock();
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if (spObserver)
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{
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spObserver->ClearData();
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++wpObserver;
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}
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else
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{
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auto toDelete = wpObserver;
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++wpObserver;
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m_observers.erase(toDelete);
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}
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}
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}
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private:
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std::list<std::weak_ptr<IK4AObserver<T>>> m_observers;
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bool m_primed = false;
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T m_mostRecentData;
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std::mutex m_mutex;
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};
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} // namespace k4aviewer
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#endif
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