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//
// Observer.h
//
// Library: Foundation
// Package: Notifications
// Module: NotificationCenter
//
// Definition of the Observer class template.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier: BSL-1.0
//
#ifndef Foundation_Observer_INCLUDED
#define Foundation_Observer_INCLUDED
#include "Poco/Foundation.h"
#include "Poco/AbstractObserver.h"
#include "Poco/Mutex.h"
namespace Poco {
template <class C, class N>
class Observer: public AbstractObserver
/// This template class implements an adapter that sits between
/// a NotificationCenter and an object receiving notifications
/// from it. It is quite similar in concept to the
/// RunnableAdapter, but provides some NotificationCenter
/// specific additional methods.
/// See the NotificationCenter class for information on how
/// to use this template class.
///
/// Instead of the Observer class template, you might want to
/// use the NObserver class template, which uses an AutoPtr to
/// pass the Notification to the callback function, thus freeing
/// you from memory management issues.
{
public:
typedef void (C::*Callback)(N*);
Observer(C& object, Callback method):
_pObject(&object),
_method(method)
{
}
Observer(const Observer& observer):
AbstractObserver(observer),
_pObject(observer._pObject),
_method(observer._method)
{
}
~Observer()
{
}
Observer& operator = (const Observer& observer)
{
if (&observer != this)
{
_pObject = observer._pObject;
_method = observer._method;
}
return *this;
}
void notify(Notification* pNf) const
{
Poco::Mutex::ScopedLock lock(_mutex);
if (_pObject)
{
N* pCastNf = dynamic_cast<N*>(pNf);
if (pCastNf)
{
pCastNf->duplicate();
(_pObject->*_method)(pCastNf);
}
}
}
bool equals(const AbstractObserver& abstractObserver) const
{
const Observer* pObs = dynamic_cast<const Observer*>(&abstractObserver);
return pObs && pObs->_pObject == _pObject && pObs->_method == _method;
}
bool accepts(Notification* pNf) const
{
return dynamic_cast<N*>(pNf) != 0;
}
AbstractObserver* clone() const
{
return new Observer(*this);
}
void disable()
{
Poco::Mutex::ScopedLock lock(_mutex);
_pObject = 0;
}
private:
Observer();
C* _pObject;
Callback _method;
mutable Poco::Mutex _mutex;
};
} // namespace Poco
#endif // Foundation_Observer_INCLUDED
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