mirror of
https://github.com/TrinityCore/TrinityCore.git
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119 lines
4.5 KiB
C++
119 lines
4.5 KiB
C++
/*
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* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __EVENTPROCESSOR_H
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#define __EVENTPROCESSOR_H
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#include "Define.h"
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#include "Duration.h"
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#include "Random.h"
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#include "advstd.h"
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#include <map>
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class EventProcessor;
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// Note. All times are in milliseconds here.
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class TC_COMMON_API BasicEvent
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{
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friend class EventProcessor;
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enum class AbortState : uint8
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{
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STATE_RUNNING,
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STATE_ABORT_SCHEDULED,
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STATE_ABORTED
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};
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public:
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BasicEvent()
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: m_abortState(AbortState::STATE_RUNNING), m_addTime(0), m_execTime(0) { }
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virtual ~BasicEvent() { } // override destructor to perform some actions on event removal
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// this method executes when the event is triggered
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// return false if event does not want to be deleted
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// e_time is execution time, p_time is update interval
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virtual bool Execute(uint64 /*e_time*/, uint32 /*p_time*/) { return true; }
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virtual bool IsDeletable() const { return true; } // this event can be safely deleted
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virtual void Abort(uint64 /*e_time*/) { } // this method executes when the event is aborted
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// Aborts the event at the next update tick
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void ScheduleAbort();
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private:
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void SetAborted();
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bool IsRunning() const { return (m_abortState == AbortState::STATE_RUNNING); }
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bool IsAbortScheduled() const { return (m_abortState == AbortState::STATE_ABORT_SCHEDULED); }
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bool IsAborted() const { return (m_abortState == AbortState::STATE_ABORTED); }
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AbortState m_abortState; // set by externals when the event is aborted, aborted events don't execute
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// these can be used for time offset control
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uint64 m_addTime; // time when the event was added to queue, filled by event handler
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uint64 m_execTime; // planned time of next execution, filled by event handler
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};
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template<typename T>
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class LambdaBasicEvent : public BasicEvent
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{
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public:
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LambdaBasicEvent(T&& callback) : BasicEvent(), _callback(std::move(callback)) { }
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bool Execute(uint64, uint32) override
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{
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_callback();
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return true;
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}
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private:
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T _callback;
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};
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template<typename T>
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using is_lambda_event = std::enable_if_t<!std::is_base_of_v<BasicEvent, std::remove_pointer_t<advstd::remove_cvref_t<T>>>>;
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class TC_COMMON_API EventProcessor
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{
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public:
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EventProcessor() : m_time(0) { }
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~EventProcessor();
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void Update(uint32 p_time);
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void KillAllEvents(bool force);
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void AddEvent(BasicEvent* event, uint64 e_time, bool set_addtime = true);
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template<typename T>
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is_lambda_event<T> AddEvent(T&& event, uint64 e_time, bool set_addtime = true) { AddEvent(new LambdaBasicEvent<T>(std::move(event)), e_time, set_addtime); }
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void AddEventAtOffset(BasicEvent* event, Milliseconds offset) { AddEvent(event, CalculateTime(offset.count())); }
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void AddEventAtOffset(BasicEvent* event, Milliseconds offset, Milliseconds offset2) { AddEvent(event, CalculateTime(urand(offset.count(), offset2.count()))); }
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template<typename T>
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is_lambda_event<T> AddEventAtOffset(T&& event, Milliseconds offset) { AddEventAtOffset(new LambdaBasicEvent<T>(std::move(event)), offset); }
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template<typename T>
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is_lambda_event<T> AddEventAtOffset(T&& event, Milliseconds offset, Milliseconds offset2) { AddEventAtOffset(new LambdaBasicEvent<T>(std::move(event)), offset, offset2); }
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void ModifyEventTime(BasicEvent* event, uint64 newTime);
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uint64 CalculateTime(uint64 t_offset) const { return m_time + t_offset; }
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protected:
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uint64 m_time;
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std::multimap<uint64, BasicEvent*> m_events;
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};
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#endif
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