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

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


#ifndef Foundation_PriorityExpire_INCLUDED
#define Foundation_PriorityExpire_INCLUDED


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


namespace Poco
{


template <class TArgs>
class PriorityExpire : public AbstractPriorityDelegate<TArgs>
/// Decorator for AbstractPriorityDelegate adding automatic
/// expiring of registrations to AbstractPriorityDelegate.
{
public:
    PriorityExpire(const AbstractPriorityDelegate<TArgs> & p, Timestamp::TimeDiff expireMilliSec)
        : AbstractPriorityDelegate<TArgs>(p)
        , _pDelegate(static_cast<AbstractPriorityDelegate<TArgs> *>(p.clone()))
        , _expire(expireMilliSec * 1000)
    {
    }

    PriorityExpire(const PriorityExpire & expire)
        : AbstractPriorityDelegate<TArgs>(expire)
        , _pDelegate(static_cast<AbstractPriorityDelegate<TArgs> *>(expire._pDelegate->clone()))
        , _expire(expire._expire)
        , _creationTime(expire._creationTime)
    {
    }

    ~PriorityExpire() { delete _pDelegate; }

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

    AbstractPriorityDelegate<TArgs> * clone() const { return new PriorityExpire(*this); }

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

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

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

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

private:
    PriorityExpire();
};


template <>
class PriorityExpire<void> : public AbstractPriorityDelegate<void>
/// Decorator for AbstractPriorityDelegate adding automatic
/// expiring of registrations to AbstractPriorityDelegate.
{
public:
    PriorityExpire(const AbstractPriorityDelegate<void> & p, Timestamp::TimeDiff expireMilliSec)
        : AbstractPriorityDelegate<void>(p)
        , _pDelegate(static_cast<AbstractPriorityDelegate<void> *>(p.clone()))
        , _expire(expireMilliSec * 1000)
    {
    }

    PriorityExpire(const PriorityExpire & expire)
        : AbstractPriorityDelegate<void>(expire)
        , _pDelegate(static_cast<AbstractPriorityDelegate<void> *>(expire._pDelegate->clone()))
        , _expire(expire._expire)
        , _creationTime(expire._creationTime)
    {
    }

    ~PriorityExpire() { delete _pDelegate; }

    PriorityExpire & operator=(const PriorityExpire & expire)
    {
        if (&expire != this)
        {
            delete this->_pDelegate;
            this->_pDelegate = static_cast<AbstractPriorityDelegate<void> *>(expire._pDelegate->clone());
            this->_expire = expire._expire;
            this->_creationTime = expire._creationTime;
        }
        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); }

    AbstractPriorityDelegate<void> * clone() const { return new PriorityExpire(*this); }

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

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

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

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

private:
    PriorityExpire();
};


} // namespace Poco


#endif // Foundation_PriorityExpire_INCLUDED