#ifndef F0270054_CDC4_4A91_B09F_73A4C75D9356
#define F0270054_CDC4_4A91_B09F_73A4C75D9356
/*
 *******************************************************************************
 *                                   INCLUDE
 *******************************************************************************
 */
#include <Poco/Mutex.h>
#include <set>

namespace Util
{
/*
 *******************************************************************************
 *                                CLASS DECLARE
 *******************************************************************************
 */
template <typename T> class HandlesManager
{
public:
    using HandleCollection = std::set<T>;

public:
    HandlesManager(unsigned count): HandlesManager(0, count)
    {
    }

    HandlesManager(unsigned begin, unsigned count)
    {
        for (T h = begin; h < (begin + count); h++)
            _freeHandles.insert(h);
    }

    HandlesManager(HandleCollection& c)
    {
        _freeHandles.insert(c);
    }

    T allocHandle()
    {
        Poco::FastMutex::ScopedLock lock(_lock);

        if (_freeHandles.size() == 0)
            throw Poco::NotFoundException("Collection is empty", -ENODATA);

        T h = *_freeHandles.begin();
        _freeHandles.erase(h);

        return h;
    }

    void freeHandle(T handle)
    {
        Poco::FastMutex::ScopedLock lock(_lock);

        if (_freeHandles.count(handle) != 0)
            throw Poco::NotFoundException("Double free", -EINVAL);

        _freeHandles.insert(handle);
    }

private:
    std::set<T>     _freeHandles;
    Poco::FastMutex _lock;
};
}
#endif