100 lines
3.6 KiB
C++
100 lines
3.6 KiB
C++
/**
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* @file aievent.cpp
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* @brief Implementation of AIEvent.
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*
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* Copyright (c) 2011, Aleric Inglewood.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (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, see <http://www.gnu.org/licenses/>.
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*
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* There are special exceptions to the terms and conditions of the GPL as
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* it is applied to this Source Code. View the full text of the exception
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* in the file doc/FLOSS-exception.txt in this software distribution.
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*
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* CHANGELOG
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* and additional copyright holders.
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*
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* 19/05/2011
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* Initial version, written by Aleric Inglewood @ SL
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*/
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#include "linden_common.h"
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#include "aievent.h"
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#include "aistatemachine.h"
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#include <map>
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// Additional information stored per registered statemachine in AIRegisteredStateMachines std::map.
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struct AIRSData {
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bool mOneShot;
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AIRSData(void) { }
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AIRSData(bool one_shot) : mOneShot(one_shot) { }
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};
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// A list of all statemachines registered for a particular event, and an API to work on it.
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struct AIRegisteredStateMachines {
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typedef std::map<AIStateMachine*, AIRSData> rsm_type;
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rsm_type mRegisteredStateMachines;
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void Register(AIStateMachine* statemachine, bool one_shot) { mRegisteredStateMachines[statemachine] = one_shot; }
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void Unregister(AIStateMachine* statemachine) { mRegisteredStateMachines.erase(statemachine); }
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void trigger(void);
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};
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// Inline this, because it's only called from one place.
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inline void AIRegisteredStateMachines::trigger(void)
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{
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rsm_type::iterator sm = mRegisteredStateMachines.begin();
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while(sm != mRegisteredStateMachines.end())
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{
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sm->first->cont(); // This is safe, cont() does never access mRegisteredStateMachines.
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if (sm->second.mOneShot)
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mRegisteredStateMachines.erase(sm++);
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else
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++sm;
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}
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}
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// A list (array) with all AIRegisteredStateMachines maps, one for each event type.
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static AIThreadSafeSimpleDC<AIRegisteredStateMachines> registered_statemachines_list[AIEvent::number_of_events];
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typedef AIAccess<AIRegisteredStateMachines> registered_statemachines_wat;
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//-----------------------------------------------------------------------------
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// External API starts here.
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// Each function obtains access to the thread-safe AIRegisteredStateMachines that belongs
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// to the given event (locking it's mutex) and then calls the corresponding method.
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// Register a statemachine for notification of event.
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// static
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void AIEvent::Register(AIEvents event, AIStateMachine* statemachine, bool one_shot)
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{
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statemachine->idle();
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registered_statemachines_wat registered_statemachines_w(registered_statemachines_list[event]);
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registered_statemachines_w->Register(statemachine, one_shot);
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}
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// Unregister a statemachine for notification of event.
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// static
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void AIEvent::Unregister(AIEvents event, AIStateMachine* statemachine)
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{
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registered_statemachines_wat registered_statemachines_w(registered_statemachines_list[event]);
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registered_statemachines_w->Unregister(statemachine);
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}
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// Trigger event.
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// static
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void AIEvent::trigger(AIEvents event)
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{
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registered_statemachines_wat registered_statemachines_w(registered_statemachines_list[event]);
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registered_statemachines_w->trigger();
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}
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