业务场景:

我们都玩过超级玛丽这款经典的游戏,里面有一个问题;就是玛丽的状态变化;

/*** Created by Administrator on 2017/12/26.* * 超级玛丽所有存在的状态state*/
public enum CurrentState {/*** 初始化时小形态*/SMALL,/*** 吃到一个蘑菇时的大形态*/BIG,/*** 吃到花朵,可攻击形态*/ATTACH,/*** godead*/DEAD}

/*** Created by Administrator on 2017/12/26.** 超级玛丽会遇到触发状态改变的trigger*/
public enum Trigger {/*** 蘑菇*/MUSHROOM,/*** 花朵*/FLOWER,/*** 妖怪*/MONSTER
}

import com.github.oxo42.stateless4j.StateMachineConfig;/*** Created by Administrator on 2017/12/26.* * state和trigger注册*/
public class StateConver {private static StateMachineConfig<CurrentState,Trigger> config = new StateMachineConfig<>();static {/*** 最初为small状态时*/config.configure(CurrentState.SMALL)/*** 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.StateMachine;
import org.junit.Test;/*** Created by Administrator on 2017/12/26.** 状态机测试类*/
public class RunStateMachine {private static StateMachine<CurrentState,Trigger> stateMachine = new StateMachine<CurrentState, Trigger>(CurrentState.SMALL,StateConver.config);@Testpublic void testStateMachine(){stateMachine.fire(Trigger.FLOWER);System.out.println("currentState-->"+stateMachine.getState());}
}

点击运行:发现竟然报错了... ...

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/JAVA/localRepository-Maven/ch/qos/logback/logback-classic/1.1.11/logback-classic-1.1.11.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/JAVA/localRepository-Maven/org/slf4j/slf4j-jdk14/1.7.25/slf4j-jdk14-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
23:39:32,496 |-INFO in ch.qos.logback.classic.LoggerContext[myAppName] - Could NOT find resource [logback.groovy]
23:39:32,496 |-INFO in ch.qos.logback.classic.LoggerContext[myAppName] - Could NOT find resource [logback-test.xml]
23:39:32,517 |-INFO in ch.qos.logback.classic.LoggerContext[myAppName] - Found resource [logback.xml] at [file:/E:/ideaworkspace/spbmyp/target/classes/logback.xml]
23:39:32,697 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set
23:39:32,703 |-INFO in ch.qos.logback.classic.joran.action.ContextNameAction - Setting logger context name as [myAppName]
23:39:32,703 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
23:39:32,706 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [console]
23:39:32,710 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
23:39:32,743 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.rolling.RollingFileAppender]
23:39:32,746 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [rollingFile]
23:39:32,756 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy@1413378318 - Will use zip compression
23:39:32,756 |-INFO in c.q.l.core.rolling.TimeBasedRollingPolicy@1413378318 - Will use the pattern logs/logback_myDemo-%d{yyyy-MM-dd}.%i.log for the active file
23:39:32,760 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@57f23557 - The date pattern is 'yyyy-MM-dd' from file name pattern 'logs/logback_myDemo-%d{yyyy-MM-dd}.%i.log.zip'.
23:39:32,760 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@57f23557 - Roll-over at midnight.
23:39:32,774 |-INFO in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@57f23557 - Setting initial period to Fri Oct 20 15:23:10 CST 2017
23:39:32,775 |-WARN in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@57f23557 - SizeAndTimeBasedFNATP is deprecated. Use SizeAndTimeBasedRollingPolicy instead
23:39:32,775 |-WARN in ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP@57f23557 - For more information see http://logback.qos.ch/manual/appenders.html#SizeAndTimeBasedRollingPolicy
23:39:32,776 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
23:39:32,778 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[rollingFile] - Active log file name: logs/logback_myDemo.log
23:39:32,778 |-INFO in ch.qos.logback.core.rolling.RollingFileAppender[rollingFile] - File property is set to [logs/logback_myDemo.log]
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [org.springframework] to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [com.ibatis] to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [com.ibatis.common.jdbc.SimpleDataSource] to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [com.ibatis.common.jdbc.ScriptRunner] to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate] to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [java.sql.Connection] to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [java.sql.Statement] to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [java.sql.PreparedStatement] to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [org.springframework.amqp] to WARN
23:39:32,779 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
23:39:32,779 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [console] to Logger[ROOT]
23:39:32,780 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [rollingFile] to Logger[ROOT]
23:39:32,780 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
23:39:32,780 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@3d0f8e03 - Registering current configuration as safe fallback pointSLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
2017-12-26 23:39:32.786 myAppName [main] INFO  com.github.oxo42.stateless4j.StateMachine - Firing FLOWERProcess finished with exit code 0

其实就是包冲突了,上面的两个包都依赖了SLF4J的包,导入那两个包后SLF4J的包被导入了2次,导致冲入,解决一下:

        <!--状态机--><dependency><groupId>com.github.oxo42</groupId><artifactId>stateless4j</artifactId><version>2.5.0</version><exclusions><exclusion><groupId>org.slf4j</groupId><artifactId>slf4j-jdk14</artifactId></exclusion></exclusions></dependency>

其中:<exclusions><exclusion><groupId>org.slf4j</groupId><artifactId>slf4j-jdk14</artifactId></exclusion></exclusions>
的意思就是在stateless4j的导包时不导入slf4j的包,这样就不会冲突了;

再次运行测试类:

2017-12-26 23:51:37.386 myAppName [main] INFO  com.github.oxo42.stateless4j.StateMachine - Firing FLOWER
currentState-->ATTACH

成功!