八字命理应用drools规则引擎

妖狐艹你老母 2022-10-31 04:25 184阅读 0赞

[调研规则引擎用于八字命理][Link 1]中介绍了easyrules，easyrules比较轻量，但实际使用规则引擎，还是drools更能胜任复杂的业务。因为决策表可以让这个逻辑更加优雅  
为什么一定要研究规则引擎，因为边缘计算中规则引擎是一个技术趋势，但是drools在边缘中运行就有些重了。当你看了很多命理书的时候，感觉还是用规则引擎来做，比使用java设计模式要强的多。  
我的目的是八字命理，并不想把kie-spring再来一遍，于是就使用到[fast-drools-spring-boot-starter][]这个插件

<properties>
            <version.fast-drools>8.0.7</version.fast-drools>
            <version.lombok>1.16.14</version.lombok>
            <version.spring-cloud>2.0.1.RELEASE</version.spring-cloud>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
    
            <dependency>
                <groupId>com.github.hongwen1993</groupId>
                <artifactId>fast-drools-spring-boot-starter</artifactId>
                <version>${version.fast-drools}</version>
            </dependency>
    
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${version.lombok}</version>
                <scope>provided</scope>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-context</artifactId>
                <version>${version.spring-cloud}</version>
            </dependency>
        </dependencies>

**1 决策表**  
![1][]

出现下面的错误是因为dto这个对象没有解析到,这里主要dto的位置要填写那个格，按照上图说明

2021-02-27 16:53:56.160 ERROR 1824 --- [pool-1-thread-1] com.drools.core.KieTemplate              : file not fount.
    2021-02-27 16:53:56.478  WARN 1824 --- [           main] o.d.c.kie.builder.impl.KieBuilderImpl    : File 'file0.drl' is in folder '' but declares package 'com.dzmsoft.qingqiu'. It is advised to have a correspondance between package and folder names.
    2021-02-27 16:53:57.269 ERROR 1824 --- [           main] o.d.c.kie.builder.impl.KieProject        : Unable to build KieBaseModel:defaultKieBase
    Predicate 'dto.setResult("旺")' must be a Boolean expression

编译出了错误，这个时候就可以参照[Drools决策表的使用][Drools]将决策表转化为drl查看发生了什么

import org.drools.decisiontable.InputType;
    import org.drools.decisiontable.SpreadsheetCompiler;
    
    @Test
        public void test02() throws FileNotFoundException { 
            File file = new File("F:\\bazi_rules\\shy.xlsx");
            InputStream is = new FileInputStream(file);
            SpreadsheetCompiler compiler = new SpreadsheetCompiler();
            String drl = compiler.compile(is, InputType.XLS);
            System.out.println(drl);
        }

下面有两个地方有异常，  
① `dto.setResult(旺)`说明ACTION应该写成`dto.setResult("$1");`，加上引号  
② when条件不正确，故提示then这个错误。第二个condition没有解析，解决方案是引用同一个对象的condition合并为一个单位格，赋值`dto:ShyGenYinDto`

package com.dzmsoft.qingqiu.rule;
    //generated from Decision Table
    import com.dzmsoft.qingqiu.rule.dto.ShyGenYinDto;
    import java.lang.Integer;
    import java.lang.String;
    // rule values at B8, header at B3
    rule "根根在年支、月支"
    	when
    		dto:ShyGenYinDto(yz == "助")
    		mz
    	then
    		dto.setResult(旺);
    end
    
    // rule values at B9, header at B3
    rule "根印在年支、月支"
    	when
    		dto:ShyGenYinDto(yz == "助")
    		mz
    	then
    		dto.setResult(旺);

2021-02-27 17:10:09.325 ERROR 8744 --- [pool-1-thread-1] com.drools.core.KieTemplate              : file not fount.
    2021-02-27 17:10:09.634  WARN 8744 --- [           main] o.d.c.kie.builder.impl.KieBuilderImpl    : File 'file0.drl' is in folder '' but declares package 'com.dzmsoft.qingqiu'. It is advised to have a correspondance between package and folder names.
    2021-02-27 17:10:09.729 ERROR 8744 --- [           main] o.d.c.kie.builder.impl.KieProject        : Unable to build KieBaseModel:defaultKieBase
    [11,1]: [ERR 102] Line 11:1 mismatched input 'then' in rule "根根在年支、月支"

正确的决策表生成规则是这样的了

rule "根根在年支、月支"
    	when
    		dto:ShyGenYinDto(yz == "助", mz == "助")
    	then
    		dto.setResult("旺");
    end

可以看到决策表中如果出现`tgbqcn>=Integer.valueOf($1) and tgbqcn<=Integer.valueOf($2)`，生成drl的时候就出现问题了，解决方案也比较简单，采用`tgbqcn>=Integer.valueOf($1) , tgbqcn<=Integer.valueOf($2)`，用逗号代替and就可以了

rule "月支根，年支、日支克月支,根本气透干2个以上"
    	when
    		dto:ShyGenYinDto(yz == "克", mz == "助", dz == "克", bqtg == "是", tgbqcn>=Integer.valueOf(2) and tgbqcn<=Integer.valueOf(3))
    	then
    		dto.setResult("弱");
    end

这里再思考一个问题，决策表的规则那么多，它们之间怎么样保证互斥关系的呢？就好比我的实验，发现实施效果并不理想。  
![1][1 1]  
为防止冲突，增加了两个配置`ACTIVATION-GROUP`对规则进行分组和`Sequential`设置为顺序执行，设置好后，发现还是不行  
将决策表生成的规则，写入到drl文件中，进行调试。  
原则上`根根在年支、时支，天干不是印比一片（包括合化）`的salience要高于`年支根，月支泄根一次，本气透干`为什么，匹配到后者呢？  
activation-group设置的一组规则，只需要一个执行，其他的就不执行了，相当于组内的规则是互斥的。那么只要`年支根，月支泄根一次，本气透干` 的`activation-group`为2，同一个规则，就可以匹配到正确的了。  
但是不同activation-group之间的呢？并不影响。  
agenda-group是同一组的规则都会执行。

package com.dzmsoft.qingqiu.rules;
    //generated from Decision Table
    import com.dzmsoft.qingqiu.rules.dto.ShyGenYinDto;
    import java.lang.Integer;
    // rules values at B90, header at B4
    rule "根根在年支、时支，天干印比一片"
    	salience 65454
    	activation-group "2"
    	when
    		dto:ShyGenYinDto(yz == "助", hz == "助", tgybyp == "1")
    	then
    		dto.setResult("旺");
    		dto.setDesc("根根在年支、时支，天干印比一片");
    end
    
    // rules values at B91, header at B4
    rule "根根在年支、时支，天干合化印比一片"
    	salience 65453
    	activation-group "2"
    	when
    		dto:ShyGenYinDto(yz == "助", hz == "助", tghhybyp == "1")
    	then
    		dto.setResult("旺");
    		dto.setDesc("根根在年支、时支，天干合化印比一片");
    end
    
    // rules values at B92, header at B4
    rule "根根在年支、时支，天干不是印比一片（包括合化）"
    	salience 65452
    	activation-group "2"
    	when
    		dto:ShyGenYinDto(yz == "助", hz == "助", tghhybyp == "0", tgybyp == "0")
    	then
    		dto.setResult("弱");
    		dto.setDesc("根根在年支、时支，天干不是印比一片（包括合化）");
    end
    
    rule "年支根，月支泄根一次，本气透干"
    	salience 65439
    	activation-group "4"
    	when
    		dto:ShyGenYinDto(yz == "助", mz == "泄", bqtg == "1")
    	then
    		dto.setResult("弱");
    		dto.setDesc("年支根，月支泄根一次，本气透干");
    end
    
    // rule values at B106, header at B4
    rule "年支根，月支泄根一次，合化本气透干"
    	salience 65438
    	activation-group "4"
    	when
    		dto:ShyGenYinDto(yz == "助", mz == "泄", hhbqtg == "1")
    	then
    		dto.setResult("弱");
    		dto.setDesc("年支根，月支泄根一次，合化本气透干");
    end

解决规则冲突，另外的办法，就是就规则设置更加清晰，问题也就能解决。比如把某些规则的值设置的更加清晰一些  
![1][1 2]

[Link 1]: https://blog.csdn.net/warrah/article/details/110262542
[fast-drools-spring-boot-starter]: https://github.com/hongwen1993/fast-drools-spring-boot-starter
[1]: /images/20221024/992a845730fe416580e1c4aad24a63d7.png
[Drools]: https://blog.csdn.net/wo541075754/article/details/78848178
[1 1]: /images/20221024/b22b4b13be2a4bc58bfe9d4685e0d494.png
[1 2]: /images/20221024/1a82bd9396514014be6005942931af54.png