回顾:

在上一篇文章<JAVA -- stateless4j StateMachine 使用浅析(一)> 

中,我们介绍了stateless4j statemachine的使用入门,这一篇我们介绍 Exit && Entry Action;

废话不多说,show you the code:

import com.github.oxo42.stateless4j.StateMachineConfig;/** * Created by Administrator on 2017/12/26. * * state和trigger注册 */public class StateConver {    public static StateMachineConfig
    
      config = new StateMachineConfig<>();    static {        /**         * 最初为small状态时         */        config.configure(CurrentState.SMALL)                /**                 * 从当前状态改变时所触发的动作                 */                .onExit(new ExitAction())                /**                 * 改变到当前状态时所触发的动作                 */                .onEntry(new EntryAction())                /**                 * 遇到蘑菇触发-->big状态                 */                .permit(Trigger.MUSHROOM,CurrentState.BIG)                /**                 * 花朵触发,-->直接变为可攻击状态                 */                .permit(Trigger.FLOWER,CurrentState.ATTACH)                /**                 * 妖怪触发,死亡状态                 */                .permit(Trigger.MONSTER,CurrentState.DEAD);        /**         * 最初为big状态          */        config.configure(CurrentState.BIG)                /**                 * 蘑菇触发,状态不变,                 * permitReentry方法state变化相同,但具体执行过程有一些区别                 */                .ignore(Trigger.MUSHROOM)                .permit(Trigger.FLOWER,CurrentState.ATTACH)                .permit(Trigger.MONSTER,CurrentState.SMALL);        config.configure(CurrentState.ATTACH)                .ignore(Trigger.MUSHROOM)                .ignore(Trigger.FLOWER)                .permit(Trigger.MONSTER,CurrentState.SMALL);        config.configure(CurrentState.DEAD)                .ignore(Trigger.MUSHROOM)                .ignore(Trigger.FLOWER)                .ignore(Trigger.MONSTER);    }}
    

import com.github.oxo42.stateless4j.delegates.Action1;import com.github.oxo42.stateless4j.transitions.Transition;/** * Created by Administrator on 2017/12/27. *  * ExitAction实现类 */public class ExitAction implements Action1
    
     
      > {    @Override    public void doIt(Transition
      
        arg1) {        System.out.println("OUT FROM :" + arg1.getSource());    }}
      
     
    

import com.github.oxo42.stateless4j.delegates.Action1;import com.github.oxo42.stateless4j.transitions.Transition;/** * Created by Administrator on 2017/12/27. *  * EntryAction实现类 */public class EntryAction implements Action1
    
     
      > {    @Override    public void doIt(Transition
      
        arg1) {        System.out.println("ENTRY TO : " +arg1.getDestination());    }}
      
     
    

/** * Created by Administrator on 2017/12/26. * * 状态机测试类 */public class RunStateMachine {    private static StateMachine
    
      stateMachine = new StateMachine
     
      (CurrentState.SMALL,StateConver.config);    @Test    public void testStateMachine(){        stateMachine.fire(Trigger.FLOWER);        System.out.println("currentState-->"+stateMachine.getState());    }}
     
    

依旧运行这个测试类,查看输出日志为:

2017-12-27 23:30:57.469 myAppName [main] INFO  com.github.oxo42.stateless4j.StateMachine - Firing FLOWEROUT FROM :SMALLcurrentState-->ATTACHProcess finished with exit code 0

成功触发exit动作;

同样的,我们可以触发一个EntryAction动作,

@Test    public void testStateMachine(){        stateMachine.fire(Trigger.FLOWER);        System.out.println("currentState-->"+stateMachine.getState());        stateMachine.fire(Trigger.MONSTER);    }

2017-12-27 23:41:32.893 myAppName [main] INFO  com.github.oxo42.stateless4j.StateMachine - Firing FLOWEROUT FROM :SMALLcurrentState-->ATTACH2017-12-27 23:41:32.896 myAppName [main] INFO  com.github.oxo42.stateless4j.StateMachine - Firing MONSTERENTRY TO : SMALLProcess finished with exit code 0

该包给我们提供了可以传入不同个数参数的Action及Action1,Action2... ...等接口,可以适应不同场合的需要去实现;

其中Transition对象为一个包含变化前后state和当前trigger对象,通过get方法获得;

另外还提供了Func接口和BooleanFunc接口,需要的时候可以使用;