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/*
* This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by the
* Free Software Foundation; either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __EVENTPROCESSOR_H
#define __EVENTPROCESSOR_H
#include "Define.h"
#include "Duration.h"
#include "Random.h"
#include "advstd.h"
#include <map>
#include <type_traits>
class EventProcessor;
// Note. All times are in milliseconds here.
class BasicEvent
{
friend class EventProcessor;
enum class AbortState : uint8
{
STATE_RUNNING,
STATE_ABORT_SCHEDULED,
STATE_ABORTED
};
public:
BasicEvent()
= default;
virtual ~BasicEvent() = default; // override destructor to perform some actions on event removal
// this method executes when the event is triggered
// return false if event does not want to be deleted
// e_time is execution time, p_time is update interval
[[nodiscard]] virtual bool Execute(uint64 /*e_time*/, uint32 /*p_time*/) { return true; }
[[nodiscard]] virtual bool IsDeletable() const { return true; } // this event can be safely deleted
virtual void Abort(uint64 /*e_time*/) { } // this method executes when the event is aborted
// Aborts the event at the next update tick
void ScheduleAbort();
private:
void SetAborted();
[[nodiscard]] bool IsRunning() const { return (m_abortState == AbortState::STATE_RUNNING); }
[[nodiscard]] bool IsAbortScheduled() const { return (m_abortState == AbortState::STATE_ABORT_SCHEDULED); }
[[nodiscard]] bool IsAborted() const { return (m_abortState == AbortState::STATE_ABORTED); }
AbortState m_abortState{AbortState::STATE_RUNNING}; // set by externals when the event is aborted, aborted events don't execute
// these can be used for time offset control
uint64 m_addTime{0}; // time when the event was added to queue, filled by event handler
uint64 m_execTime{0}; // planned time of next execution, filled by event handler
};
template<typename T>
class LambdaBasicEvent : public BasicEvent
{
public:
LambdaBasicEvent(T&& callback) : BasicEvent(), _callback(std::move(callback)) { }
bool Execute(uint64, uint32) override
{
_callback();
return true;
}
private:
T _callback;
};
template<typename T>
using is_lambda_event = std::enable_if_t<!std::is_base_of_v<BasicEvent, std::remove_pointer_t<advstd::remove_cvref_t<T>>>>;
typedef std::multimap<uint64, BasicEvent*> EventList;
class EventProcessor
{
public:
EventProcessor() = default;
~EventProcessor();
void Update(uint32 p_time);
void KillAllEvents(bool force);
void AddEvent(BasicEvent* Event, uint64 e_time, bool set_addtime = true);
template<typename T>
is_lambda_event<T> AddEvent(T&& event, Milliseconds e_time, bool set_addtime = true) { AddEvent(new LambdaBasicEvent<T>(std::move(event)), e_time, set_addtime); }
void AddEventAtOffset(BasicEvent* event, Milliseconds offset) { AddEvent(event, CalculateTime(offset.count())); }
void AddEventAtOffset(BasicEvent* event, Milliseconds offset, Milliseconds offset2) { AddEvent(event, CalculateTime(randtime(offset, offset2).count())); }
template<typename T>
is_lambda_event<T> AddEventAtOffset(T&& event, Milliseconds offset) { AddEventAtOffset(new LambdaBasicEvent<T>(std::move(event)), offset); }
template<typename T>
is_lambda_event<T> AddEventAtOffset(T&& event, Milliseconds offset, Milliseconds offset2) { AddEventAtOffset(new LambdaBasicEvent<T>(std::move(event)), offset, offset2); }
void ModifyEventTime(BasicEvent* event, Milliseconds newTime);
[[nodiscard]] uint64 CalculateTime(uint64 t_offset) const;
//calculates next queue tick time
[[nodiscard]] uint64 CalculateQueueTime(uint64 delay) const;
protected:
uint64 m_time{0};
EventList m_events;
bool m_aborting;
};
#endif
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