newValue/3part/lp_qt_utils/inc/lp_multi_base.h

#pragma once

#include <mutex>
#include <atomic>
#include <shared_mutex>
#include <map>

template<class T>
class lp_multi_base
{
public:
	class PTR {
	public:
		PTR(T* ptr) { ptr_ = ptr; }
		~PTR() { if (ptr_) ptr_->mutex_lock_.unlock_shared(); }
		bool valid() { return (ptr_) ? true : false; }
		T* data() { return ptr_; }
		T* operator->() { return ptr_; }
	private:
		T* ptr_{ nullptr };
	};

protected:
	static std::recursive_mutex s_inst_map_mutex_;
	static std::map<std::string, T*> s_inst_map_;

	std::string inst_name_;
	std::shared_mutex mutex_lock_;

public:
	lp_multi_base(const std::string& inst_name)
		: inst_name_(inst_name)
	{};

	virtual ~lp_multi_base(void) {};
	virtual void close() {};

	static void create_instance(const std::string& inst_name)
	{
		std::lock_guard<std::recursive_mutex> locker(s_inst_map_mutex_);
		if (inst_name.empty())	return;

		typename std::map<std::string, T*>::iterator itr;
		itr = s_inst_map_.find(inst_name);

		if (itr == s_inst_map_.end()){
			s_inst_map_[inst_name] = new T(inst_name);
		}
	};

	static T* get_instance(const std::string& inst_name)
	{
		std::lock_guard<std::recursive_mutex> locker(s_inst_map_mutex_);
		if (inst_name.empty())	return nullptr;

		typename std::map<std::string, T*>::iterator itr;
		itr = s_inst_map_.find(inst_name);

		if (itr != s_inst_map_.end()){
			itr->second->mutex_lock_.lock_shared();
			return itr->second;
		}

		return nullptr;

	};

	static void uninstance(const std::string& inst_name)
	{
		std::lock_guard<std::recursive_mutex> locker(s_inst_map_mutex_);
		if (inst_name.empty())	return;

		typename std::map<std::string, T*>::iterator itr;
		itr = s_inst_map_.find(inst_name);

		if (itr != s_inst_map_.end()){
			T* pptr = itr->second;
			pptr->mutex_lock_.lock();
			pptr->mutex_lock_.unlock();
			s_inst_map_.erase(itr);
			pptr->close();
		}
	};

	//static void uninstance1(const std::string& inst_name)
	//{
	//	std::lock_guard<std::recursive_mutex> locker(s_inst_map_mutex_);
	//	if (inst_name.empty())	return;

	//	typename std::map<std::string, T*>::iterator itr;
	//	itr = s_inst_map_.find(inst_name);

	//	while (itr != s_inst_map_.end()) {
	//		T* pptr = itr->second;
	//		pptr->mutex_lock_.lock();
	//		pptr->mutex_lock_.unlock();
	//		s_inst_map_.erase(itr);
	//		pptr->close();
	//		itr++;
	//	}
	//};

	static void uninstance_all()
	{
		std::lock_guard<std::recursive_mutex> locker(s_inst_map_mutex_);

		typename std::map<std::string, T*>::iterator itr = s_inst_map_.begin();
		for (; itr != s_inst_map_.end();)
		{
			T* pptr = itr->second;
			pptr->mutex_lock_.lock();
			pptr->mutex_lock_.unlock();
			s_inst_map_.erase(itr++);
			pptr->close();
		}

	};
};

template <class T>
std::map<std::string, T*>  lp_multi_base<T>::s_inst_map_;
template <class T>
std::recursive_mutex  lp_multi_base<T>::s_inst_map_mutex_;