BAEL-804 A guide to Spring Drools

pom.xml

@@ -215,6 +215,7 @@
         <module>spring-data-gemfire</module>
         <module>cucumber</module>
         <module>mybatis</module>
+        <module>spring-drools</module>
     </modules>
 
     <build>

spring-drools/pom.xml

@@ -0,0 +1,130 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<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>com.baeldung</groupId>
+    <artifactId>spring-drools</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <properties>
+        <spring-boot-version>1.1.1.RELEASE</spring-boot-version>
+        <http-component-version>4.0-alpha6</http-component-version>
+        <drools-version>7.0.0.CR1</drools-version>
+        <apache-poi-version>3.13</apache-poi-version>
+        <surefire-plugin-version>2.19.1</surefire-plugin-version>
+    </properties>
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>io.spring.platform</groupId>
+                <artifactId>platform-bom</artifactId>
+                <version>${spring-boot-version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-actuator</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpcore</artifactId>
+            <version>${http-component-version}</version>
+        </dependency>
+        <!-- ... -->
+        <dependency>
+            <groupId>org.kie</groupId>
+            <artifactId>kie-ci</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-core</artifactId>
+            <version>${drools-version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.drools</groupId>
+            <artifactId>drools-compiler</artifactId>
+            <version>${drools-version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.poi</groupId>
+            <artifactId>poi</artifactId>
+            <version>${apache-poi-version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.poi</groupId>
+            <artifactId>poi-ooxml</artifactId>
+            <version>${apache-poi-version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.kie</groupId>
+            <artifactId>kie-spring</artifactId>
+            <version>6.4.0.Final</version>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.springframework</groupId>
+                    <artifactId>spring-tx</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.springframework</groupId>
+                    <artifactId>spring-beans</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.springframework</groupId>
+                    <artifactId>spring-core</artifactId>
+                </exclusion>
+                <exclusion>
+                    <groupId>org.springframework</groupId>
+                    <artifactId>spring-context</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>${surefire-plugin-version}</version>
+                <configuration>
+                    <excludes>
+                        <exclude>**/*IntegrationTest.java</exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

spring-drools/src/main/java/com/baeldung/spring/drools/Application.java

@@ -0,0 +1,30 @@
+package com.baeldung.spring.drools;
+
+
+import com.baeldung.spring.drools.model.Applicant;
+import com.baeldung.spring.drools.model.Product;
+import com.baeldung.spring.drools.model.SuggestedRole;
+import com.baeldung.spring.drools.service.ApplicantService;
+import com.baeldung.spring.drools.service.ProductService;
+import org.kie.api.KieServices;
+import org.kie.api.runtime.KieContainer;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Import;
+
+@SpringBootApplication
+@Import(DroolConfiguration.class)
+public class Application {
+
+    public static void main(String[] args) {
+        ApplicationContext ctx = SpringApplication.run(Application.class, args);
+        ApplicantService applicantService=(ApplicantService)ctx.getBean("applicantService");
+        applicantService.suggestARoleForApplicant(new Applicant("Baljeet",37,1200000.0,8),new SuggestedRole());
+
+        ProductService productService=(ProductService)ctx.getBean("productService");
+        Product returnedProduct=productService.applyLabelToProduct(new Product("Microwave","Book"));
+    }
+
+}

spring-drools/src/main/java/com/baeldung/spring/drools/DroolConfiguration.java

@@ -0,0 +1,83 @@
+package com.baeldung.spring.drools;
+
+import com.baeldung.spring.drools.service.ApplicantService;
+import com.baeldung.spring.drools.service.ProductService;
+import org.kie.api.KieBase;
+import org.kie.api.KieServices;
+import org.kie.api.builder.*;
+import org.kie.api.runtime.KieContainer;
+import org.kie.api.runtime.KieSession;
+import org.kie.internal.io.ResourceFactory;
+import org.kie.spring.KModuleBeanFactoryPostProcessor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.core.io.support.ResourcePatternResolver;
+
+import java.io.IOException;
+
+@Configuration
+public class DroolConfiguration {
+
+    private static final String RULES_PATH = "com/baeldung/spring/drools/rules/";
+
+    @Bean
+    public KieFileSystem kieFileSystem() throws IOException {
+        KieFileSystem kieFileSystem = getKieServices().newKieFileSystem();
+        for (Resource file : getRuleFiles()) {
+            kieFileSystem.write(ResourceFactory.newClassPathResource(RULES_PATH + file.getFilename(), "UTF-8"));
+        }
+        return kieFileSystem;
+    }
+
+    private Resource[] getRuleFiles() throws IOException {
+        ResourcePatternResolver resourcePatternResolver = new PathMatchingResourcePatternResolver();
+        return resourcePatternResolver.getResources("classpath*:" + RULES_PATH + "**/*.*");
+    }
+
+    @Bean
+    public KieContainer kieContainer() throws IOException {
+        final KieRepository kieRepository = getKieServices().getRepository();
+
+        kieRepository.addKieModule(new KieModule() {
+            public ReleaseId getReleaseId() {
+                return kieRepository.getDefaultReleaseId();
+            }
+        });
+
+        KieBuilder kieBuilder = getKieServices().newKieBuilder(kieFileSystem());
+        kieBuilder.buildAll();
+
+        return getKieServices().newKieContainer(kieRepository.getDefaultReleaseId());
+    }
+
+    private KieServices getKieServices() {
+        return KieServices.Factory.get();
+    }
+
+    @Bean
+    public KieBase kieBase() throws IOException {
+        return kieContainer().getKieBase();
+    }
+
+    @Bean
+    public KieSession kieSession() throws IOException {
+        return kieContainer().newKieSession();
+    }
+
+    @Bean
+    public ApplicantService getApplicantService(){
+        return new ApplicantService();
+    }
+
+    @Bean
+    public ProductService getProductService(KieContainer kieContainer){
+        return new ProductService();
+    }
+
+    @Bean
+    public KModuleBeanFactoryPostProcessor kiePostProcessor() {
+        return new KModuleBeanFactoryPostProcessor();
+    }
+}

spring-drools/src/main/java/com/baeldung/spring/drools/model/Applicant.java

@@ -0,0 +1,48 @@
+package com.baeldung.spring.drools.model;
+
+public class Applicant {
+
+    private String name;
+    private int age;
+    private double currentSalary;
+    private int experienceInYears;
+
+    public Applicant(String name, int age, Double currentSalary, int experienceInYears) {
+        this.name = name;
+        this.age = age;
+        this.currentSalary = currentSalary;
+        this.experienceInYears = experienceInYears;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public Double getCurrentSalary() {
+        return currentSalary;
+    }
+
+    public void setCurrentSalary(Double currentSalary) {
+        this.currentSalary = currentSalary;
+    }
+
+    public int getExperienceInYears() {
+        return experienceInYears;
+    }
+
+    public void setExperienceInYears(int experienceInYears) {
+        this.experienceInYears = experienceInYears;
+    }
+}

spring-drools/src/main/java/com/baeldung/spring/drools/model/Product.java

@@ -0,0 +1,38 @@
+package com.baeldung.spring.drools.model;
+
+public class Product {
+    private String name;
+    private String type;
+
+    private String label;
+
+    public Product(String name, String type) {
+        this.name = name;
+        this.type = type;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public void setType(String type) {
+        this.type = type;
+    }
+
+    public String getLabel() {
+        return label;
+    }
+
+    public void setLabel(String label) {
+        this.label = label;
+    }
+
+}

spring-drools/src/main/java/com/baeldung/spring/drools/model/SuggestedRole.java

@@ -0,0 +1,14 @@
+package com.baeldung.spring.drools.model;
+
+public class SuggestedRole {
+
+    private String role;
+
+    public String getRole() {
+        return role;
+    }
+
+    public void setRole(String role) {
+        this.role = role;
+    }
+}

spring-drools/src/main/java/com/baeldung/spring/drools/service/ApplicantService.java

@@ -0,0 +1,25 @@
+package com.baeldung.spring.drools.service;
+
+import com.baeldung.spring.drools.model.Applicant;
+import com.baeldung.spring.drools.model.SuggestedRole;
+import org.kie.api.runtime.KieContainer;
+import org.kie.api.runtime.KieSession;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class ApplicantService {
+
+    @Autowired
+    private KieContainer kieContainer;
+
+    public SuggestedRole suggestARoleForApplicant(Applicant applicant,SuggestedRole suggestedRole){
+        KieSession kieSession = kieContainer.newKieSession();
+        kieSession.insert(applicant);
+        kieSession.setGlobal("suggestedRole",suggestedRole);
+        kieSession.fireAllRules();
+        System.out.println(suggestedRole.getRole());
+        return  suggestedRole;
+
+    }
+}