ClickHouse/base/poco/Foundation/include/Poco/Expire.h

//
// Expire.h
//
// Library: Foundation
// Package: Events
// Module:  Expire
//
// Implementation of the Expire template.
//
// Copyright (c) 2006-2011, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_Expire_INCLUDED
#define Foundation_Expire_INCLUDED


#include "Poco/AbstractDelegate.h"
#include "Poco/Foundation.h"
#include "Poco/Timestamp.h"


namespace Poco
{


template <class TArgs>
class Expire : public AbstractDelegate<TArgs>
/// Decorator for AbstractDelegate adding automatic
/// expiration of registrations to AbstractDelegate's.
{
public:
    Expire(const AbstractDelegate<TArgs> & p, Timestamp::TimeDiff expireMillisecs) : _pDelegate(p.clone()), _expire(expireMillisecs * 1000)
    {
    }

    Expire(const Expire & expire)
        : AbstractDelegate<TArgs>(expire)
        , _pDelegate(expire._pDelegate->clone())
        , _expire(expire._expire)
        , _creationTime(expire._creationTime)
    {
    }

    ~Expire() { delete _pDelegate; }

    Expire & operator=(const Expire & expire)
    {
        if (&expire != this)
        {
            delete this->_pDelegate;
            this->_pDelegate = expire._pDelegate->clone();
            this->_expire = expire._expire;
            this->_creationTime = expire._creationTime;
            this->_pTarget = expire._pTarget;
        }
        return *this;
    }

    bool notify(const void * sender, TArgs & arguments)
    {
        if (!expired())
            return this->_pDelegate->notify(sender, arguments);
        else
            return false;
    }

    bool equals(const AbstractDelegate<TArgs> & other) const { return other.equals(*_pDelegate); }

    AbstractDelegate<TArgs> * clone() const { return new Expire(*this); }

    void disable() { _pDelegate->disable(); }

    const AbstractDelegate<TArgs> * unwrap() const { return this->_pDelegate; }

protected:
    bool expired() const { return _creationTime.isElapsed(_expire); }

    AbstractDelegate<TArgs> * _pDelegate;
    Timestamp::TimeDiff _expire;
    Timestamp _creationTime;

private:
    Expire();
};


template <>
class Expire<void> : public AbstractDelegate<void>
/// Decorator for AbstractDelegate adding automatic
/// expiration of registrations to AbstractDelegate's.
{
public:
    Expire(const AbstractDelegate<void> & p, Timestamp::TimeDiff expireMillisecs) : _pDelegate(p.clone()), _expire(expireMillisecs * 1000)
    {
    }

    Expire(const Expire & expire)
        : AbstractDelegate<void>(expire)
        , _pDelegate(expire._pDelegate->clone())
        , _expire(expire._expire)
        , _creationTime(expire._creationTime)
    {
    }

    ~Expire() { delete _pDelegate; }

    Expire & operator=(const Expire & expire)
    {
        if (&expire != this)
        {
            delete this->_pDelegate;
            this->_pDelegate = expire._pDelegate->clone();
            this->_expire = expire._expire;
            this->_creationTime = expire._creationTime;
            //this->_pTarget = expire._pTarget;
        }
        return *this;
    }

    bool notify(const void * sender)
    {
        if (!expired())
            return this->_pDelegate->notify(sender);
        else
            return false;
    }

    bool equals(const AbstractDelegate<void> & other) const { return other.equals(*_pDelegate); }

    AbstractDelegate<void> * clone() const { return new Expire(*this); }

    void disable() { _pDelegate->disable(); }

    const AbstractDelegate<void> * unwrap() const { return this->_pDelegate; }

protected:
    bool expired() const { return _creationTime.isElapsed(_expire); }

    AbstractDelegate<void> * _pDelegate;
    Timestamp::TimeDiff _expire;
    Timestamp _creationTime;

private:
    Expire();
};


} // namespace Poco


#endif // Foundation_Expire_INCLUDED