Drools7.5.0教程（10）-drools规则流的使用

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。

1. 项目结构
   

2. 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;
       }
   
   }

3. 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

4. 修改kmodule.xml 文件

   
   <kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
       <kbase name="process" packages="process">
           <ksession name="ksession-process"/>
       kbase>
   kmodule>
   

5. 新建规则流文件 sample.bpmn
   

   指定规则文件相关属性：
   

   流程中指定，分数校验模块的规则组：
   

   设置网关的判断条件：
   

   编辑各条网关连接线的判断依据：
   

   编辑分支流程继续执行的任务，在这，仅执行一个打印任务：
   

6. 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();
           }
       }
   
   }
   

7. 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

 
<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" >

    
    <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>

    
    <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>