stateless java_JAVA — stateless4j StateMachine 使用浅析(二)

回顾:

在上一篇文章

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 FLOWER

OUT FROM :SMALL

currentState–>ATTACH

Process 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 FLOWER

OUT FROM :SMALL

currentState–>ATTACH

2017-12-27 23:41:32.896 myAppName [main] INFO com.github.oxo42.stateless4j.StateMachine – Firing MONSTER

ENTRY TO : SMALL

Process 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;