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

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


#ifndef Foundation_Delegate_INCLUDED
#define Foundation_Delegate_INCLUDED


#include "Poco/AbstractDelegate.h"
#include "Poco/Expire.h"
#include "Poco/Foundation.h"
#include "Poco/FunctionDelegate.h"
#include "Poco/Mutex.h"


namespace Poco
{


template <class TObj, class TArgs, bool withSender = true>
class Delegate : public AbstractDelegate<TArgs>
{
public:
    typedef void (TObj::*NotifyMethod)(const void *, TArgs &);

    Delegate(TObj * obj, NotifyMethod method) : _receiverObject(obj), _receiverMethod(method) { }

    Delegate(const Delegate & delegate)
        : AbstractDelegate<TArgs>(delegate), _receiverObject(delegate._receiverObject), _receiverMethod(delegate._receiverMethod)
    {
    }

    ~Delegate() { }

    Delegate & operator=(const Delegate & delegate)
    {
        if (&delegate != this)
        {
            this->_receiverObject = delegate._receiverObject;
            this->_receiverMethod = delegate._receiverMethod;
        }
        return *this;
    }

    bool notify(const void * sender, TArgs & arguments)
    {
        Mutex::ScopedLock lock(_mutex);
        if (_receiverObject)
        {
            (_receiverObject->*_receiverMethod)(sender, arguments);
            return true;
        }
        else
            return false;
    }

    bool equals(const AbstractDelegate<TArgs> & other) const
    {
        const Delegate * pOtherDelegate = dynamic_cast<const Delegate *>(other.unwrap());
        return pOtherDelegate && _receiverObject == pOtherDelegate->_receiverObject && _receiverMethod == pOtherDelegate->_receiverMethod;
    }

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

    void disable()
    {
        Mutex::ScopedLock lock(_mutex);
        _receiverObject = 0;
    }

protected:
    TObj * _receiverObject;
    NotifyMethod _receiverMethod;
    Mutex _mutex;

private:
    Delegate();
};


template <class TObj, class TArgs>
class Delegate<TObj, TArgs, false> : public AbstractDelegate<TArgs>
{
public:
    typedef void (TObj::*NotifyMethod)(TArgs &);

    Delegate(TObj * obj, NotifyMethod method) : _receiverObject(obj), _receiverMethod(method) { }

    Delegate(const Delegate & delegate)
        : AbstractDelegate<TArgs>(delegate), _receiverObject(delegate._receiverObject), _receiverMethod(delegate._receiverMethod)
    {
    }

    ~Delegate() { }

    Delegate & operator=(const Delegate & delegate)
    {
        if (&delegate != this)
        {
            this->_receiverObject = delegate._receiverObject;
            this->_receiverMethod = delegate._receiverMethod;
        }
        return *this;
    }

    bool notify(const void *, TArgs & arguments)
    {
        Mutex::ScopedLock lock(_mutex);
        if (_receiverObject)
        {
            (_receiverObject->*_receiverMethod)(arguments);
            return true;
        }
        else
            return false;
    }

    bool equals(const AbstractDelegate<TArgs> & other) const
    {
        const Delegate * pOtherDelegate = dynamic_cast<const Delegate *>(other.unwrap());
        return pOtherDelegate && _receiverObject == pOtherDelegate->_receiverObject && _receiverMethod == pOtherDelegate->_receiverMethod;
    }

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

    void disable()
    {
        Mutex::ScopedLock lock(_mutex);
        _receiverObject = 0;
    }

protected:
    TObj * _receiverObject;
    NotifyMethod _receiverMethod;
    Mutex _mutex;

private:
    Delegate();
};


template <class TObj, class TArgs>
inline Delegate<TObj, TArgs, true> delegate(TObj * pObj, void (TObj::*NotifyMethod)(const void *, TArgs &))
{
    return Delegate<TObj, TArgs, true>(pObj, NotifyMethod);
}


template <class TObj, class TArgs>
inline Delegate<TObj, TArgs, false> delegate(TObj * pObj, void (TObj::*NotifyMethod)(TArgs &))
{
    return Delegate<TObj, TArgs, false>(pObj, NotifyMethod);
}


template <class TObj, class TArgs>
inline Expire<TArgs> delegate(TObj * pObj, void (TObj::*NotifyMethod)(const void *, TArgs &), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<TArgs>(Delegate<TObj, TArgs, true>(pObj, NotifyMethod), expireMillisecs);
}


template <class TObj, class TArgs>
inline Expire<TArgs> delegate(TObj * pObj, void (TObj::*NotifyMethod)(TArgs &), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<TArgs>(Delegate<TObj, TArgs, false>(pObj, NotifyMethod), expireMillisecs);
}


template <class TArgs>
inline Expire<TArgs> delegate(void (*NotifyMethod)(const void *, TArgs &), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<TArgs>(FunctionDelegate<TArgs, true, true>(NotifyMethod), expireMillisecs);
}


template <class TArgs>
inline Expire<TArgs> delegate(void (*NotifyMethod)(void *, TArgs &), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<TArgs>(FunctionDelegate<TArgs, true, false>(NotifyMethod), expireMillisecs);
}


template <class TArgs>
inline Expire<TArgs> delegate(void (*NotifyMethod)(TArgs &), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<TArgs>(FunctionDelegate<TArgs, false>(NotifyMethod), expireMillisecs);
}


template <class TArgs>
inline FunctionDelegate<TArgs, true, true> delegate(void (*NotifyMethod)(const void *, TArgs &))
{
    return FunctionDelegate<TArgs, true, true>(NotifyMethod);
}


template <class TArgs>
inline FunctionDelegate<TArgs, true, false> delegate(void (*NotifyMethod)(void *, TArgs &))
{
    return FunctionDelegate<TArgs, true, false>(NotifyMethod);
}


template <class TArgs>
inline FunctionDelegate<TArgs, false> delegate(void (*NotifyMethod)(TArgs &))
{
    return FunctionDelegate<TArgs, false>(NotifyMethod);
}


template <class TObj>
class Delegate<TObj, void, true> : public AbstractDelegate<void>
{
public:
    typedef void (TObj::*NotifyMethod)(const void *);

    Delegate(TObj * obj, NotifyMethod method) : _receiverObject(obj), _receiverMethod(method) { }

    Delegate(const Delegate & delegate)
        : AbstractDelegate<void>(delegate), _receiverObject(delegate._receiverObject), _receiverMethod(delegate._receiverMethod)
    {
    }

    ~Delegate() { }

    Delegate & operator=(const Delegate & delegate)
    {
        if (&delegate != this)
        {
            this->_receiverObject = delegate._receiverObject;
            this->_receiverMethod = delegate._receiverMethod;
        }
        return *this;
    }

    bool notify(const void * sender)
    {
        Mutex::ScopedLock lock(_mutex);
        if (_receiverObject)
        {
            (_receiverObject->*_receiverMethod)(sender);
            return true;
        }
        else
            return false;
    }

    bool equals(const AbstractDelegate<void> & other) const
    {
        const Delegate * pOtherDelegate = dynamic_cast<const Delegate *>(other.unwrap());
        return pOtherDelegate && _receiverObject == pOtherDelegate->_receiverObject && _receiverMethod == pOtherDelegate->_receiverMethod;
    }

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

    void disable()
    {
        Mutex::ScopedLock lock(_mutex);
        _receiverObject = 0;
    }

protected:
    TObj * _receiverObject;
    NotifyMethod _receiverMethod;
    Mutex _mutex;

private:
    Delegate();
};


template <class TObj>
class Delegate<TObj, void, false> : public AbstractDelegate<void>
{
public:
    typedef void (TObj::*NotifyMethod)();

    Delegate(TObj * obj, NotifyMethod method) : _receiverObject(obj), _receiverMethod(method) { }

    Delegate(const Delegate & delegate)
        : AbstractDelegate<void>(delegate), _receiverObject(delegate._receiverObject), _receiverMethod(delegate._receiverMethod)
    {
    }

    ~Delegate() { }

    Delegate & operator=(const Delegate & delegate)
    {
        if (&delegate != this)
        {
            this->_receiverObject = delegate._receiverObject;
            this->_receiverMethod = delegate._receiverMethod;
        }
        return *this;
    }

    bool notify(const void *)
    {
        Mutex::ScopedLock lock(_mutex);
        if (_receiverObject)
        {
            (_receiverObject->*_receiverMethod)();
            return true;
        }
        else
            return false;
    }

    bool equals(const AbstractDelegate<void> & other) const
    {
        const Delegate * pOtherDelegate = dynamic_cast<const Delegate *>(other.unwrap());
        return pOtherDelegate && _receiverObject == pOtherDelegate->_receiverObject && _receiverMethod == pOtherDelegate->_receiverMethod;
    }

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

    void disable()
    {
        Mutex::ScopedLock lock(_mutex);
        _receiverObject = 0;
    }

protected:
    TObj * _receiverObject;
    NotifyMethod _receiverMethod;
    Mutex _mutex;

private:
    Delegate();
};


template <class TObj>
inline Delegate<TObj, void, true> delegate(TObj * pObj, void (TObj::*NotifyMethod)(const void *))
{
    return Delegate<TObj, void, true>(pObj, NotifyMethod);
}


template <class TObj>
inline Delegate<TObj, void, false> delegate(TObj * pObj, void (TObj::*NotifyMethod)())
{
    return Delegate<TObj, void, false>(pObj, NotifyMethod);
}


template <class TObj>
inline Expire<void> delegate(TObj * pObj, void (TObj::*NotifyMethod)(const void *), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<void>(Delegate<TObj, void, true>(pObj, NotifyMethod), expireMillisecs);
}


template <class TObj>
inline Expire<void> delegate(TObj * pObj, void (TObj::*NotifyMethod)(), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<void>(Delegate<TObj, void, false>(pObj, NotifyMethod), expireMillisecs);
}


inline Expire<void> delegate(void (*NotifyMethod)(const void *), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<void>(FunctionDelegate<void, true, true>(NotifyMethod), expireMillisecs);
}


inline Expire<void> delegate(void (*NotifyMethod)(void *), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<void>(FunctionDelegate<void, true, false>(NotifyMethod), expireMillisecs);
}


inline Expire<void> delegate(void (*NotifyMethod)(), Timestamp::TimeDiff expireMillisecs)
{
    return Expire<void>(FunctionDelegate<void, false>(NotifyMethod), expireMillisecs);
}


inline FunctionDelegate<void, true, true> delegate(void (*NotifyMethod)(const void *))
{
    return FunctionDelegate<void, true, true>(NotifyMethod);
}


inline FunctionDelegate<void, true, false> delegate(void (*NotifyMethod)(void *))
{
    return FunctionDelegate<void, true, false>(NotifyMethod);
}


inline FunctionDelegate<void, false> delegate(void (*NotifyMethod)())
{
    return FunctionDelegate<void, false>(NotifyMethod);
}


} // namespace Poco


#endif // Foundation_Delegate_INCLUDED