IAPDemo/Libraries/red_utils/FSM/RUStateTransition.cpp

//
//  RUStateTransition.cpp
//  RoleTool
//
//  Created by 徐炼新 on 2023/4/19.
//

#include "RUStateTransition.h"
#include "RUState.h"
#include <stdio.h>

NS_RU_BEGIN

StateTransition* StateTransition::create(StateMachine* machine,
                                         const FsmTransition* transition,
                                         std::function<void(StateTransition*, std::function<void(void)>, bool)> cf) {
    auto st = new StateTransition();
    st->autorelease();
    st->retain();
    st->_machine = machine;
    st->_transition = transition;
    st->_cf = cf;
    return st;
}

void StateTransition::setEvent(const std::string& eventName,
                               const std::map<std::string, std::string>& eventParams,
                               std::function<void(void)> handleEventCb) {
    _eventName = eventName;
    _eventParams = eventParams;
    _cf4Event = handleEventCb;
}

void StateTransition::interrupt() {
    // 打断当前的转移
    _bIsInterrupted = true;
}

void StateTransition::execute() {
    // 事件结束的回调处理
    auto execHandleEventCb = [=](void){
        if (_cf) {
            auto cf = _cf;
            _cf = nullptr;
            cf(this, _cf4Event, _bIsInterrupted);
        }
    };
    /***
     执行顺序
     1.老状态exit
     2.老状态before_switch_actions动作
     3.设置新状态
     4.新状态after_switch_actions动作
     5.新状态entry
     6.事件结束回调
     ***/
    State* fromState = _machine->getState(_transition->fromState);
    State* toState = _machine->getState(_transition->toState);
    const std::vector<StateActInfo>& beforeSwitchActInfos = _transition->beforeSwitchActInfos;
    const std::vector<StateActInfo>& afterSwitchActInfos = _transition->afterSwitchActInfos;
    
    auto execEntry = [=](void){
        if (_bIsInterrupted) {
            execHandleEventCb();
        } else {
            _machine->setRunningStateName(_transition->toState);
            retain();
            toState->entry([=](){
                execHandleEventCb();
                release();
            });
        }
    };
    
    auto execAfterSwitchAct = [=](void) {
        if (_bIsInterrupted) {
            execHandleEventCb();
        } else {
            StateActInfo evt;
            evt.actType = _eventName;
            evt.actParams = _eventParams;
            toState->afterSwitch(afterSwitchActInfos, evt, execEntry);
        }
    };
    
    auto execBeforeSwitchAct = [=](void) {
        if (_bIsInterrupted) {
            execHandleEventCb();
        } else {
            StateActInfo evt;
            evt.actType = _eventName;
            evt.actParams = _eventParams;
            fromState->beforeSwitch(beforeSwitchActInfos, evt, execAfterSwitchAct);
        }
    };
    fromState->exit(execBeforeSwitchAct);
}


NS_RU_END