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/*
* This file is part of the TrinityCore 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 General Public License as published by the
* Free Software Foundation; either version 2 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 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>
class EventProcessor;
// Note. All times are in milliseconds here.
class TC_COMMON_API BasicEvent
{
friend class EventProcessor;
enum class AbortState : uint8
{
STATE_RUNNING,
STATE_ABORT_SCHEDULED,
STATE_ABORTED
};
public:
BasicEvent()
: m_abortState(AbortState::STATE_RUNNING), m_addTime(0), m_execTime(0) { }
virtual ~BasicEvent() { } // 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
virtual bool Execute(uint64 /*e_time*/, uint32 /*p_time*/) { return true; }
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();
bool IsRunning() const { return (m_abortState == AbortState::STATE_RUNNING); }
bool IsAbortScheduled() const { return (m_abortState == AbortState::STATE_ABORT_SCHEDULED); }
bool IsAborted() const { return (m_abortState == AbortState::STATE_ABORTED); }
AbortState m_abortState; // set by externals when the event is aborted, aborted events don't execute
// these can be used for time offset control
uint64 m_addTime; // time when the event was added to queue, filled by event handler
uint64 m_execTime; // 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<!advstd::is_base_of_v<BasicEvent, std::remove_pointer_t<advstd::remove_cvref_t<T>>>>;
class TC_COMMON_API EventProcessor
{
public:
EventProcessor() : m_time(0) { }
~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, uint64 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(urand(offset.count(), 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, uint64 newTime);
uint64 CalculateTime(uint64 t_offset) const { return m_time + t_offset; }
std::multimap<uint64, BasicEvent*> const& GetEvents() const { return m_events; }
protected:
uint64 m_time;
std::multimap<uint64, BasicEvent*> m_events;
};
#endif
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