Java中流程引擎 java流程引擎 drools

转载

charlesc 2024-01-30 01:41:03

文章标签 Java中流程引擎 3d xml d3 文章分类 Java 后端开发

Drools7.5.0教程（10）-drools规则流的使用

drools,是由JBOSS公司开源的一套基于JAVA的规则引擎系统

什么是规则流，规则流什么用？

规则流能够控制，规则中的复杂流程，在复杂业务中，很多时候并不需要触发所有的规则，很多时候需要触发的规则也需要，像程序一样，符合某些逻辑，如，当X对象X 属性等于 A 时，触发规则A 中的规则，当等于B时，触发规则B中的规则，这时候用规则流就能够很好的处理，这类问题。

规则流怎么使用

如何使用规则流？那我们就来写个例子来尝试下吧！我们还用老例子，输入一个分数，我们判断一个水平，如：60分及格，70-90分优秀，然后我们根据判断结果打印出对应的语句。

项目结构
创建实体类

package com.sample;

public class ScoreRule {
    //分数
    private Integer score;
    //注释
    private String desc;

    public Integer getScore() {
        return score;
    }

    public void setScore(Integer score) {
        this.score = score;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

}

创建规则文件，直接贴代码

package com.sample

import com.sample.ScoreRule;

//执行之后不重复执行
no-loop

//规则名
rule "no-pass"//没过
    //规则组名
    ruleflow-group "score"
    when
        s: ScoreRule( score<60 )
    then
        s.setDesc( "no-pass" );
        update( s );
end

rule "pass"//及格
    ruleflow-group "score"
    when
        s: ScoreRule( score>=60&&score<70 )
    then
        s.setDesc( "pass" );
        update( s );
end

rule "good"//良好
    ruleflow-group "score"
    when
        s: ScoreRule( score>=70&&score<90 )
    then
        s.setDesc( "good" );
        update( s );
end

rule "excellent"//优秀
    ruleflow-group "score"
    when
        s: ScoreRule( score>=90&&score<100 )
    then
        s.setDesc( "excellent" );
        update( s );
end

rule "perfect"//完美
    ruleflow-group "score"
    when
        s: ScoreRule( score==100 )
    then
        s.setDesc( "perfect" );
        update( s );
end

修改kmodule.xml 文件

<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
    <kbase name="process" packages="process">
        <ksession name="ksession-process"/>
    </kbase>
</kmodule>

新建规则流文件 sample.bpmn

Java中流程引擎 java流程引擎 drools_d3

指定规则文件相关属性：

Java中流程引擎 java流程引擎 drools_3d_02

流程中指定，分数校验模块的规则组：

Java中流程引擎 java流程引擎 drools_3d_03

设置网关的判断条件：

Java中流程引擎 java流程引擎 drools_Java中流程引擎_04

编辑各条网关连接线的判断依据：

Java中流程引擎 java流程引擎 drools_3d_05

编辑分支流程继续执行的任务，在这，仅执行一个打印任务：

Java中流程引擎 java流程引擎 drools_3d_06

好了，我们可以编写测试代码了，代码如下：

package com.sample;

import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;

/**
 * This is a sample file to launch a process.
 */
public class ProcessTest {

    public static final void main(String[] args) {
        try {
            KieServices ks = KieServices.Factory.get();
            KieContainer kContainer = ks.getKieClasspathContainer();
            KieSession kSession = kContainer.newKieSession("ksession-process");
            //编写fact对象
            ScoreRule rule=new ScoreRule();
            rule.setScore(75);
            kSession.insert(rule);
            //执行所要执行的流程
            kSession.startProcess("com.sample.bpmn.scorerule");
            kSession.fireAllRules();  
        } catch (Throwable t) {
            t.printStackTrace();
        }
    }

}

好，我们来看看结果吧

没错，正确了执行了规则流，当然这个规则流非常简单，大家可以继续尝试更复杂的组件哦，最后，贴下，整个bpmn的代码，供大家参考

<?xml version="1.0" encoding="UTF-8"?> 
<definitions id="Definition"
             targetNamespace="http://www.jboss.org/drools"
             typeLanguage="http://www.java.com/javaTypes"
             expressionLanguage="http://www.mvel.org/2.0"
             xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd"
             xmlns:g="http://www.jboss.org/drools/flow/gpd"
             xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
             xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"
             xmlns:di="http://www.omg.org/spec/DD/20100524/DI"
             xmlns:tns="http://www.jboss.org/drools">

  <process processType="Private" isExecutable="true" id="com.sample.bpmn.scorerule" name="ScoreRule" tns:packageName="com.sample" >

    <!-- nodes -->
    <startEvent id="_1"  isInterrupting="true">
    </startEvent>
    <endEvent id="_3" >
        <terminateEventDefinition />
    </endEvent>
    <businessRuleTask id="bbb899bd-5f36-4cae-89b6-0b89853a8192" name="分数校验" g:ruleFlowGroup="score" 
 implementation="http://www.jboss.org/drools/rule" >
      <ioSpecification>
        <inputSet>
        </inputSet>
        <outputSet>
        </outputSet>
      </ioSpecification>
    </businessRuleTask>
    <exclusiveGateway id="91cef05a-2603-4018-88ab-d6922ec1f808" name="Gateway" gatewayDirection="Diverging" >
    </exclusiveGateway>
    <scriptTask id="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" name="Script" scriptFormat="http://www.java.com/java" >
      <script>System.out.println("恭喜你已经及格");</script>
    </scriptTask>
    <scriptTask id="084929f2-2d04-45cb-ba3d-ea2755ac402c" name="Script" >
      <script>System.out.println("您的成绩是良好");</script>
    </scriptTask>
    <scriptTask id="54b211e0-c635-4fca-a7b8-4025a05cb3d3" name="Script" >
      <script>System.out.println("优秀优秀！！！！");</script>
    </scriptTask>
    <scriptTask id="840beb7c-37a2-462b-a216-ae80b277ed21" name="Script" >
      <script>System.out.println("恭喜您，满分！");</script>
    </scriptTask>
    <scriptTask id="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" name="Script" scriptFormat="http://www.java.com/java" >
      <script>System.out.println("你没及格！");</script>
    </scriptTask>
    <endEvent id="f0ed00b1-39a9-4b27-9234-db4e57beecf9" name="End" >
        <terminateEventDefinition />
    </endEvent>
    <endEvent id="067b5f8a-684d-49fc-9ca2-7c5e125528de" name="End" >
        <terminateEventDefinition />
    </endEvent>
    <endEvent id="d09b3d2e-0483-484f-83be-fd1dedb58b6d" name="End" >
        <terminateEventDefinition />
    </endEvent>
    <endEvent id="b10e26da-6f85-44e1-b49c-7eab1913a1d3" name="End" >
        <terminateEventDefinition />
    </endEvent>

    <!-- connections -->
    <sequenceFlow id="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29-_3" sourceRef="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" targetRef="_3" />
    <sequenceFlow id="_1-bbb899bd-5f36-4cae-89b6-0b89853a8192" sourceRef="_1" targetRef="bbb899bd-5f36-4cae-89b6-0b89853a8192" />
    <sequenceFlow id="bbb899bd-5f36-4cae-89b6-0b89853a8192-91cef05a-2603-4018-88ab-d6922ec1f808" sourceRef="bbb899bd-5f36-4cae-89b6-0b89853a8192" targetRef="91cef05a-2603-4018-88ab-d6922ec1f808" />
    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" name="及格" tns:priority="1" >
      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="pass" )</conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-084929f2-2d04-45cb-ba3d-ea2755ac402c" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="084929f2-2d04-45cb-ba3d-ea2755ac402c" name="良好" tns:priority="1" >
      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="good" )</conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-54b211e0-c635-4fca-a7b8-4025a05cb3d3" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="54b211e0-c635-4fca-a7b8-4025a05cb3d3" name="优秀" tns:priority="1" >
      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="excellent" )</conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-840beb7c-37a2-462b-a216-ae80b277ed21" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="840beb7c-37a2-462b-a216-ae80b277ed21" name="完美" tns:priority="1" >
      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="perfect" )</conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="91cef05a-2603-4018-88ab-d6922ec1f808-6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" sourceRef="91cef05a-2603-4018-88ab-d6922ec1f808" targetRef="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" name="不及格" tns:priority="1" >
      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >s: ScoreRule( desc=="no-pass" )</conditionExpression>
    </sequenceFlow>
    <sequenceFlow id="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e-f0ed00b1-39a9-4b27-9234-db4e57beecf9" sourceRef="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" targetRef="f0ed00b1-39a9-4b27-9234-db4e57beecf9" />
    <sequenceFlow id="084929f2-2d04-45cb-ba3d-ea2755ac402c-067b5f8a-684d-49fc-9ca2-7c5e125528de" sourceRef="084929f2-2d04-45cb-ba3d-ea2755ac402c" targetRef="067b5f8a-684d-49fc-9ca2-7c5e125528de" />
    <sequenceFlow id="54b211e0-c635-4fca-a7b8-4025a05cb3d3-d09b3d2e-0483-484f-83be-fd1dedb58b6d" sourceRef="54b211e0-c635-4fca-a7b8-4025a05cb3d3" targetRef="d09b3d2e-0483-484f-83be-fd1dedb58b6d" />
    <sequenceFlow id="840beb7c-37a2-462b-a216-ae80b277ed21-b10e26da-6f85-44e1-b49c-7eab1913a1d3" sourceRef="840beb7c-37a2-462b-a216-ae80b277ed21" targetRef="b10e26da-6f85-44e1-b49c-7eab1913a1d3" />

  </process>

  <bpmndi:BPMNDiagram>
    <bpmndi:BPMNPlane bpmnElement="com.sample.bpmn.scorerule" >
      <bpmndi:BPMNShape bpmnElement="_1" >
        <dc:Bounds x="29" y="173" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_3" >
        <dc:Bounds x="665" y="19" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="bbb899bd-5f36-4cae-89b6-0b89853a8192" >
        <dc:Bounds x="170" y="173" width="80" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808" >
        <dc:Bounds x="354" y="172" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" >
        <dc:Bounds x="491" y="98" width="80" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="084929f2-2d04-45cb-ba3d-ea2755ac402c" >
        <dc:Bounds x="493" y="170" width="80" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="54b211e0-c635-4fca-a7b8-4025a05cb3d3" >
        <dc:Bounds x="496" y="240" width="80" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="840beb7c-37a2-462b-a216-ae80b277ed21" >
        <dc:Bounds x="496" y="313" width="80" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" >
        <dc:Bounds x="492" y="22" width="80" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="f0ed00b1-39a9-4b27-9234-db4e57beecf9" >
        <dc:Bounds x="670" y="101" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="067b5f8a-684d-49fc-9ca2-7c5e125528de" >
        <dc:Bounds x="671" y="175" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="d09b3d2e-0483-484f-83be-fd1dedb58b6d" >
        <dc:Bounds x="675" y="255" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="b10e26da-6f85-44e1-b49c-7eab1913a1d3" >
        <dc:Bounds x="681" y="326" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29-_3" >
        <di:waypoint x="532" y="46" />
        <di:waypoint x="689" y="43" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_1-bbb899bd-5f36-4cae-89b6-0b89853a8192" >
        <di:waypoint x="53" y="197" />
        <di:waypoint x="210" y="197" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="bbb899bd-5f36-4cae-89b6-0b89853a8192-91cef05a-2603-4018-88ab-d6922ec1f808" >
        <di:waypoint x="210" y="197" />
        <di:waypoint x="378" y="196" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e" >
        <di:waypoint x="378" y="196" />
        <di:waypoint x="531" y="122" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-084929f2-2d04-45cb-ba3d-ea2755ac402c" >
        <di:waypoint x="378" y="196" />
        <di:waypoint x="533" y="194" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-54b211e0-c635-4fca-a7b8-4025a05cb3d3" >
        <di:waypoint x="378" y="196" />
        <di:waypoint x="536" y="264" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-840beb7c-37a2-462b-a216-ae80b277ed21" >
        <di:waypoint x="378" y="196" />
        <di:waypoint x="536" y="337" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="91cef05a-2603-4018-88ab-d6922ec1f808-6d8d6cc7-a04f-4158-8abb-ea85dc0d4c29" >
        <di:waypoint x="378" y="196" />
        <di:waypoint x="532" y="46" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="5f6b8b61-685e-4c20-a9b8-bd3e65cc8a4e-f0ed00b1-39a9-4b27-9234-db4e57beecf9" >
        <di:waypoint x="531" y="122" />
        <di:waypoint x="694" y="125" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="084929f2-2d04-45cb-ba3d-ea2755ac402c-067b5f8a-684d-49fc-9ca2-7c5e125528de" >
        <di:waypoint x="533" y="194" />
        <di:waypoint x="695" y="199" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="54b211e0-c635-4fca-a7b8-4025a05cb3d3-d09b3d2e-0483-484f-83be-fd1dedb58b6d" >
        <di:waypoint x="536" y="264" />
        <di:waypoint x="699" y="279" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="840beb7c-37a2-462b-a216-ae80b277ed21-b10e26da-6f85-44e1-b49c-7eab1913a1d3" >
        <di:waypoint x="536" y="337" />
        <di:waypoint x="705" y="350" />
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>

</definitions>

本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。