#include "ILog.h"
#include <thread>
std::shared_ptr<ILog> &ILog::GetInstance(std::shared_ptr<ILog> *impl)
{
    static std::shared_ptr<ILog> instance = std::make_shared<ILog>();
    static bool instanceChanging = false;
    if (impl && false == instanceChanging)
    {
        // Don't use std::mutex for runing faster.
        // Sleep for difference thread to release instance.
        instanceChanging = true;
        //std::this_thread::sleep_for(std::chrono::milliseconds(100));
        if (instance.use_count() == 1) // bug?
        {
            instance->Log("Instance change succeed.\n");
            instance->UnInit();
            (*impl)->Init();
            instance = *impl;
        }
        else
        {
            instance->Log("[ error ] instance change failed, using by some one.\n");
        }
        instanceChanging = false;
    }
    if (instanceChanging)
    {
        static std::shared_ptr<ILog> tmporaryInstance = std::make_shared<ILog>();
        return tmporaryInstance;
    }
    return instance;
}