95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
/* PCSX2 - PS2 Emulator for PCs
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* Copyright (C) 2002-2010 PCSX2 Dev Team
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*
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* PCSX2 is free software: you can redistribute it and/or modify it under the terms
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* of the GNU Lesser General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the 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 along with PCSX2.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <list>
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#include <mutex>
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// --------------------------------------------------------------------------------------
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// EventSource< template EvtType >
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// --------------------------------------------------------------------------------------
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template <typename ListenerType>
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class EventSource
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{
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public:
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typedef typename ListenerType::EvtParams EvtParams;
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typedef typename std::list<ListenerType*> ListenerList;
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typedef typename ListenerList::iterator ListenerIterator;
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protected:
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typedef typename ListenerList::const_iterator ConstIterator;
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ListenerList m_listeners;
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// This is a cached copy of the listener list used to handle standard dispatching, which
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// allows for self-modification of the EventSource's listener list by the listeners.
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// Translation: The dispatcher uses this copy instead, to avoid iterator invalidation.
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ListenerList m_cache_copy;
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bool m_cache_valid;
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std::mutex m_listeners_lock;
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public:
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EventSource()
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{
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m_cache_valid = false;
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}
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virtual ~EventSource() = default;
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virtual ListenerIterator Add(ListenerType& listener);
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virtual void Remove(ListenerType& listener);
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virtual void Remove(const ListenerIterator& listenerHandle);
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void Add(ListenerType* listener)
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{
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if (listener == NULL)
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return;
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Add(*listener);
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}
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void Remove(ListenerType* listener)
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{
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if (listener == NULL)
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return;
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Remove(*listener);
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}
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void Dispatch(const EvtParams& params);
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protected:
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virtual ListenerIterator _AddFast_without_lock(ListenerType& listener);
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virtual void _DispatchRaw(ListenerIterator iter, const ListenerIterator& iend, const EvtParams& params);
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};
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// --------------------------------------------------------------------------------------
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// IEventDispatcher
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// --------------------------------------------------------------------------------------
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// This class is used as a base interface for EventListeners. It allows the listeners to do
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// customized dispatching of several event types into "user friendly" function overrides.
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//
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template <typename EvtParams>
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class IEventDispatcher
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{
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protected:
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IEventDispatcher() {}
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public:
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virtual ~IEventDispatcher() = default;
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virtual void DispatchEvent(const EvtParams& params) = 0;
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};
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