jboss规则引擎KIE Drools 2

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使用JAVA程序调用规则-运行KIE-DROOLS上的规则

第一步：建立一个MAVEN的Java工程

POM.XML

给出pom.xml文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>os.nut.drools</groupId><artifactId>drools-training</artifactId><version>0.0.1-SNAPSHOT</version><properties><drools.version>6.3.0.Final</drools.version></properties><repositories><repository><id>guvnor-m2-repo</id><name>Guvnor M2 Repo</name><url>http://192.168.0.101:8080/kie-drools/maven2/</url></repository></repositories><dependencies><!-- drools --><dependency><groupId>org.kie</groupId><artifactId>kie-api</artifactId><version>${drools.version}</version></dependency><dependency><groupId>org.drools</groupId><artifactId>drools-core</artifactId><version>${drools.version}</version></dependency><dependency><groupId>org.drools</groupId><artifactId>drools-compiler</artifactId><version>${drools.version}</version></dependency><dependency><groupId>org.drools</groupId><artifactId>drools-decisiontables</artifactId><version>${drools.version}</version></dependency><dependency><groupId>org.drools</groupId><artifactId>drools-templates</artifactId><version>${drools.version}</version></dependency><dependency><groupId>org.kie</groupId><artifactId>kie-ci</artifactId><version>${drools.version}</version></dependency><!-- test --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.7</version><scope>test</scope></dependency></dependencies></project>

POM.XML解释

关键在于下面这两段：

Java程序通过远程地址读取kie-drools仓库内的规则用的就是这个包。

第二步：工程结构

保持和远程KIE-DROOLS上的package名字一样

PaymentInfo.java文件

你可以直接把kie-drools内的data object里的这个Facts代码存到你本地来

编写远程调用客户端

package org.sky.drools.approvaldecision;import java.io.InputStream;import org.drools.compiler.kproject.ReleaseIdImpl;
import org.drools.core.io.impl.UrlResource;
import org.kie.api.KieServices;
import org.kie.api.builder.KieModule;
import org.kie.api.builder.KieRepository;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.StatelessKieSession;public class RemotePaymentRulz {public static void main(String[] args) throws Exception {String url = "http://192.168.0.101:8080/kie-drools/maven2/org/sky/drools/ApprovalDecision/1.0.0/ApprovalDecision-1.0.0.jar";ReleaseIdImpl releaseId = new ReleaseIdImpl("org.sky。drools", "ApprovalDecision", "LATEST");KieServices ks = KieServices.Factory.get();KieRepository kr = ks.getRepository();UrlResource urlResource = (UrlResource) ks.getResources().newUrlResource(url);urlResource.setUsername("tomcat");urlResource.setPassword("tomcat");urlResource.setBasicAuthentication("enabled");InputStream is = urlResource.getInputStream();KieModule kModule = kr.addKieModule(ks.getResources().newInputStreamResource(is));KieContainer kContainer = ks.newKieContainer(kModule.getReleaseId());StatelessKieSession kSession = kContainer.newStatelessKieSession("defaultStatelessKieSession");PaymentInfo m = new PaymentInfo();m.setMoneyAmount(5001);kSession.execute(m);System.out.println(m.getDecisionPath());if (m.getDecisionPath().equalsIgnoreCase("m")) {System.out.println("数额<=5000需要经理审批");} else {System.out.println("数额>5000需要总经理审批");}
}
}

远程客户端核心代码解释

String url = "http://192.168.0.101:8080/kie-drools/maven2/org/sky/drools/ApprovalDecision/1.0.0/ApprovalDecision-1.0.0.jar";
KieServices ks = KieServices.Factory.get();
KieRepository kr = ks.getRepository();
UrlResource urlResource = (UrlResource) ks.getResources().newUrlResource(url);

以上代码很简单，它告诉JAVA，需要上哪儿去调用我们位于远程布署的规则

urlResource.setUsername("tomcat");
urlResource.setPassword("tomcat");
urlResource.setBasicAuthentication("enabled");
InputStream is = urlResource.getInputStream();
KieModule kModule = kr.addKieModule(ks.getResources().newInputStreamResource(is));
KieContainer kContainer = ks.newKieContainer(kModule.getReleaseId());

以上代码做的事情就是相当于在IE中打开KIE-DROOLS的Web地址，然后输入用户名、密码并点击登录

StatelessKieSession kSession = kContainer.newStatelessKieSession("defaultStatelessKieSession");PaymentInfo m = new PaymentInfo();
m.setMoneyAmount(5001);
kSession.execute(m);
System.out.println(m.getDecisionPath());
if (m.getDecisionPath().equalsIgnoreCase("m")) {
System.out.println("数额<=5000需要经理审批");
} else {
System.out.println("数额>5000需要总经理审批");
}

这段代码用的就是statelessSession接口去调用规则的。
由于规则中有一句话“ modify (m) { setDecisionPath("GM") };”
因此规则会依据传入的 PaymentInfo.paymentAmount的值去修改 PaymentInfo.decisionPath的值。

运行

客户端代码写完了，先不要急着运行！！！

因为我们还没有把我们位于KIE-DROOLS上的项目生成：

org/sky/drools/ApprovalDecision/1.0.0/ApprovalDecision-1.0.0.jar

如上述这样的可用“资源”呢！！！

将规则项目生成可供远程调用的“资源”，按照下面步骤来做：