mirror of https://github.com/Icinga/icinga2.git
97 lines
2.7 KiB
C++
97 lines
2.7 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#ifndef OBSERVABLE_H
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#define OBSERVABLE_H
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namespace icinga
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{
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/**
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* Base class for event arguments.
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*
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* @ingroup base
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*/
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struct I2_BASE_API EventArgs
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{
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Object::Ptr Source; /**< The source of the event. */
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};
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/**
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* An observable event. Observers can be registered for it.
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*
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* @ingroup base
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*/
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template<class TArgs>
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class Observable
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{
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public:
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typedef function<int (const TArgs&)> ObserverType;
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private:
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vector<ObserverType> m_Observers;
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public:
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/**
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* Adds an observer to this event.
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*
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* @param rhs The observer.
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*/
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Observable<TArgs>& operator +=(const ObserverType& rhs)
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{
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m_Observers.push_back(rhs);
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return *this;
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}
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/**
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* Removes an observer from this event.
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*
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* @param rhs The observer.
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*/
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Observable<TArgs>& operator -=(const ObserverType& rhs)
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{
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m_Observers.erase(rhs);
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return *this;
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}
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/**
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* Invokes each observer function that is registered for this event. Any
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* observer function which returns -1 is removed.
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*
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* @param args Event arguments.
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*/
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void operator()(const TArgs& args)
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{
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typename vector<ObserverType>::iterator i;
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for (i = m_Observers.begin(); i != m_Observers.end(); ) {
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int result = (*i)(args);
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if (result == -1)
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i = m_Observers.erase(i);
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else
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i++;
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}
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}
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};
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}
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#endif /* OBSERVABLE_H */
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