Merge branch 'master' of https://github.com/JonCook/tutorials

spring-drools/README.md

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+## Spring Drools
+
+This modules contains articles about Spring with Drools
+
+## Relevant articles:
+
+- [Drools Spring Integration](https://www.baeldung.com/drools-spring-integration)

spring-drools/pom.xml

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+<?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>
+	<name>spring-drools</name>
+	
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <dependencies>
+        <!-- ... -->
+        <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>
+        <!--spring integration -->
+        <dependency>
+            <groupId>org.kie</groupId>
+            <artifactId>kie-spring</artifactId>
+            <version>${drools-version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <version>${spring-framework.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <drools-version>7.0.0.Final</drools-version>
+        <spring-framework.version>4.3.3.RELEASE</spring-framework.version>
+    </properties>
+
+</project>

spring-drools/src/main/java/com/baeldung/spring/drools/app/ApplicationRunner.java

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+package com.baeldung.spring.drools.app;
+
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+import com.baeldung.spring.drools.model.TaxiRide;
+import com.baeldung.spring.drools.model.Fare;
+import com.baeldung.spring.drools.service.TaxiFareCalculatorService;
+import com.baeldung.spring.drools.service.TaxiFareConfiguration;
+
+public class ApplicationRunner {
+
+    public static void main(String[] args) {
+        ApplicationContext context = new AnnotationConfigApplicationContext(TaxiFareConfiguration.class);
+        TaxiFareCalculatorService taxiFareCalculatorService = (TaxiFareCalculatorService) context.getBean(TaxiFareCalculatorService.class);
+        TaxiRide taxiRide = new TaxiRide();
+        taxiRide.setIsNightSurcharge(true);
+        taxiRide.setDistanceInMile(190L);
+        Fare rideFare = new Fare();
+        taxiFareCalculatorService.calculateFare(taxiRide, rideFare);
+    }
+
+}

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

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+package com.baeldung.spring.drools.model;
+
+public class Fare {
+
+    private Long nightSurcharge;
+    private Long rideFare;
+
+    public Fare() {
+        nightSurcharge = 0L;
+        rideFare = 0L;
+    }
+
+    public Long getNightSurcharge() {
+        return nightSurcharge;
+    }
+
+    public void setNightSurcharge(Long nightSurcharge) {
+        this.nightSurcharge = nightSurcharge;
+    }
+
+    public Long getRideFare() {
+        return rideFare;
+    }
+
+    public void setRideFare(Long rideFare) {
+        this.rideFare = rideFare;
+    }
+
+    public Long getTotalFare() {
+        return nightSurcharge + rideFare;
+    }
+
+}

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

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+package com.baeldung.spring.drools.model;
+
+public class TaxiRide {
+
+    private Boolean isNightSurcharge;
+    private Long distanceInMile;
+
+    public Boolean getIsNightSurcharge() {
+        return isNightSurcharge;
+    }
+
+    public void setIsNightSurcharge(Boolean isNightSurcharge) {
+        this.isNightSurcharge = isNightSurcharge;
+    }
+
+    public Long getDistanceInMile() {
+        return distanceInMile;
+    }
+
+    public void setDistanceInMile(Long distanceInMile) {
+        this.distanceInMile = distanceInMile;
+    }
+
+}

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

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+package com.baeldung.spring.drools.service;
+
+import org.kie.api.runtime.KieContainer;
+import org.kie.api.runtime.KieSession;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import com.baeldung.spring.drools.model.Fare;
+import com.baeldung.spring.drools.model.TaxiRide;
+
+@Service
+public class TaxiFareCalculatorService {
+
+    @Autowired
+    private KieContainer kContainer;
+
+    public Long calculateFare(TaxiRide taxiRide, Fare rideFare) {
+        KieSession kieSession = kContainer.newKieSession();
+        kieSession.setGlobal("rideFare", rideFare);
+        kieSession.insert(taxiRide);
+        kieSession.fireAllRules();
+        kieSession.dispose();
+        System.out.println("!! RIDE FARE !! " + rideFare.getTotalFare());
+        return rideFare.getTotalFare();
+    }
+}

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

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+package com.baeldung.spring.drools.service;
+
+import org.kie.api.KieServices;
+import org.kie.api.builder.KieBuilder;
+import org.kie.api.builder.KieFileSystem;
+import org.kie.api.builder.KieModule;
+import org.kie.api.runtime.KieContainer;
+import org.kie.internal.io.ResourceFactory;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ComponentScan("com.baeldung.spring.drools.service")
+public class TaxiFareConfiguration {
+
+    public static final String drlFile = "TAXI_FARE_RULE.drl";
+
+    @Bean
+    public KieContainer kieContainer() {
+        KieServices kieServices = KieServices.Factory.get();
+
+        KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
+        kieFileSystem.write(ResourceFactory.newClassPathResource(drlFile));
+        KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem);
+        kieBuilder.buildAll();
+        KieModule kieModule = kieBuilder.getKieModule();
+
+        return kieServices.newKieContainer(kieModule.getReleaseId());
+        
+    }
+}

spring-drools/src/main/resources/TAXI_FARE_RULE.drl

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+import com.baeldung.spring.drools.model.TaxiRide;
+import com.baeldung.spring.drools.model.Fare;
+import java.util.*;
+
+global com.baeldung.spring.drools.model.Fare rideFare;
+dialect  "mvel"
+
+rule "Calculate Taxi Fare - Scenario 1"
+    when
+        taxiRideInstance:TaxiRide(isNightSurcharge == false && distanceInMile < 10);
+    then
+       	rideFare.setNightSurcharge(0);
+       	rideFare.setRideFare(70);
+end
+
+rule "Calculate Taxi Fare - Scenario 2"
+    when
+        taxiRideInstance:TaxiRide(isNightSurcharge == true && distanceInMile < 10);
+    then
+       	rideFare.setNightSurcharge(30);
+       	rideFare.setRideFare(70);
+end
+
+
+rule "Calculate Taxi Fare - Scenario 3"
+    when
+        taxiRideInstance:TaxiRide(isNightSurcharge == false && distanceInMile >= 10 && distanceInMile < 100);
+    then
+       	rideFare.setNightSurcharge(0);
+       	rideFare.setRideFare(70+(2*taxiRideInstance.getDistanceInMile()));
+end
+
+
+rule "Calculate Taxi Fare - Scenario 4"
+    when
+        taxiRideInstance:TaxiRide(isNightSurcharge == true && distanceInMile >= 10 && distanceInMile < 100);
+    then
+       	rideFare.setNightSurcharge(30+taxiRideInstance.getDistanceInMile());
+       	rideFare.setRideFare(70+(2*taxiRideInstance.getDistanceInMile()));
+end
+
+
+rule "Calculate Taxi Fare - Scenario 5"
+    when
+        taxiRideInstance:TaxiRide(isNightSurcharge == false && distanceInMile >= 100);
+    then
+       	rideFare.setNightSurcharge(0);
+       	rideFare.setRideFare(70+(1.5*taxiRideInstance.getDistanceInMile()));
+end
+
+rule "Calculate Taxi Fare - Scenario 6"
+    when
+        taxiRideInstance:TaxiRide(isNightSurcharge == true && distanceInMile >= 100);
+    then
+       	rideFare.setNightSurcharge(30+taxiRideInstance.getDistanceInMile());
+       	rideFare.setRideFare(70+(1.5*taxiRideInstance.getDistanceInMile()));
+end

spring-drools/src/main/resources/logback.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

spring-drools/src/test/java/com/baeldung/spring/drools/service/TaxiFareCalculatorServiceIntegrationTest.java

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+package com.baeldung.spring.drools.service;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.spring.drools.model.Fare;
+import com.baeldung.spring.drools.model.TaxiRide;
+
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = TaxiFareConfiguration.class)
+public class TaxiFareCalculatorServiceIntegrationTest {
+
+    @Autowired
+    private TaxiFareCalculatorService taxiFareCalculatorService;
+
+    @Test
+    public void whenNightSurchargeFalseAndDistanceLessThan10_thenFixFareWithoutNightSurcharge() {
+        TaxiRide taxiRide = new TaxiRide();
+        taxiRide.setIsNightSurcharge(false);
+        taxiRide.setDistanceInMile(9L);
+        Fare rideFare = new Fare();
+        Long totalCharge = taxiFareCalculatorService.calculateFare(taxiRide, rideFare);
+
+        assertNotNull(totalCharge);
+        assertEquals(Long.valueOf(70), totalCharge);
+    }
+    
+    @Test
+    public void whenNightSurchargeTrueAndDistanceLessThan10_thenFixFareWithNightSurcharge() {
+        TaxiRide taxiRide = new TaxiRide();
+        taxiRide.setIsNightSurcharge(true);
+        taxiRide.setDistanceInMile(5L);
+        Fare rideFare = new Fare();
+        Long totalCharge = taxiFareCalculatorService.calculateFare(taxiRide, rideFare);
+
+        assertNotNull(totalCharge);
+        assertEquals(Long.valueOf(100), totalCharge);
+    }
+
+    @Test
+    public void whenNightSurchargeFalseAndDistanceLessThan100_thenDoubleFareWithoutNightSurcharge() {
+        TaxiRide taxiRide = new TaxiRide();
+        taxiRide.setIsNightSurcharge(false);
+        taxiRide.setDistanceInMile(50L);
+        Fare rideFare = new Fare();
+        Long totalCharge = taxiFareCalculatorService.calculateFare(taxiRide, rideFare);
+
+        assertNotNull(totalCharge);
+        assertEquals(Long.valueOf(170), totalCharge);
+    }
+    
+    @Test
+    public void whenNightSurchargeTrueAndDistanceLessThan100_thenDoubleFareWithNightSurcharge() {
+        TaxiRide taxiRide = new TaxiRide();
+        taxiRide.setIsNightSurcharge(true);
+        taxiRide.setDistanceInMile(50L);
+        Fare rideFare = new Fare();
+        Long totalCharge = taxiFareCalculatorService.calculateFare(taxiRide, rideFare);
+
+        assertNotNull(totalCharge);
+        assertEquals(Long.valueOf(250), totalCharge);
+    }
+    
+    @Test
+    public void whenNightSurchargeFalseAndDistanceGreaterThan100_thenExtraPercentFareWithoutNightSurcharge() {
+        TaxiRide taxiRide = new TaxiRide();
+        taxiRide.setIsNightSurcharge(false);
+        taxiRide.setDistanceInMile(100L);
+        Fare rideFare = new Fare();
+        Long totalCharge = taxiFareCalculatorService.calculateFare(taxiRide, rideFare);
+
+        assertNotNull(totalCharge);
+        assertEquals(Long.valueOf(220), totalCharge);
+    }
+    
+    @Test
+    public void whenNightSurchargeTrueAndDistanceGreaterThan100_thenExtraPercentFareWithNightSurcharge() {
+        TaxiRide taxiRide = new TaxiRide();
+        taxiRide.setIsNightSurcharge(true);
+        taxiRide.setDistanceInMile(100L);
+        Fare rideFare = new Fare();
+        Long totalCharge = taxiFareCalculatorService.calculateFare(taxiRide, rideFare);
+
+        assertNotNull(totalCharge);
+        assertEquals(Long.valueOf(350), totalCharge);
+    }
+
+}

spring-drools/src/test/java/org/baeldung/SpringContextIntegrationTest.java

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+package org.baeldung;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.spring.drools.service.TaxiFareConfiguration;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = TaxiFareConfiguration.class)
+public class SpringContextIntegrationTest {
+
+    @Test
+    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
+    }
+}

spring-drools/src/test/java/org/baeldung/SpringContextTest.java

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+package org.baeldung;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+import com.baeldung.spring.drools.service.TaxiFareConfiguration;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@ContextConfiguration(classes = TaxiFareConfiguration.class)
+public class SpringContextTest {
+
+    @Test
+    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
+    }
+}