BAEL-803: Backward Chaining with Drools (#2741)
* spring beans DI examples * fix-1: shortening examples * List of Rules Engines in Java * BAEL-812: Openl-Tablets example added * BAEL-812: artifacts names changed * BAEL-812: moving rule-engines examples to rule-engines folder * BAEL-812: removing evaluation article files * BAEL-812: folder renamed * BAEL-812: folder renamed * BAEL-812: pom.xml - parent added * BAEL-1027: Introduction to GraphQL - initial commit * BAEL-781: Explore the new Spring Cloud Gateway * BAEL-781: Fix UserService.java * BAEL-781: Fix user-service pom.xml * BAEL-781: remove eureka-server from the example * BAEL-781: modifying example * BAEL-803: Backward Chaining wih Drools * BAEL-803: pom.xml
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felipeazv
adamd1985
parent
d0862d2804
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>drools-backward-chaining</artifactId>
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<version>1.0</version>
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<name>drools-backward-chaining</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<properties>
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<runtime.version>6.4.0.Final</runtime.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.kie</groupId>
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<artifactId>kie-api</artifactId>
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<version>${runtime.version}</version>
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</dependency>
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<dependency>
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<groupId>org.drools</groupId>
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<artifactId>drools-core</artifactId>
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<version>${runtime.version}</version>
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</dependency>
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<dependency>
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<groupId>org.drools</groupId>
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<artifactId>drools-decisiontables</artifactId>
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<version>${runtime.version}</version>
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</dependency>
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</dependencies>
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</project>
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package com.baeldung;
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import org.kie.api.KieServices;
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import org.kie.api.runtime.KieContainer;
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import org.kie.api.runtime.KieSession;
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import com.baeldung.model.Beatle;
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public class BackwardChainingBeatles {
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public static void main(String[] args) {
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KieServices ks = KieServices.Factory.get();
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KieContainer kContainer = ks.getKieClasspathContainer();
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KieSession kSession = kContainer.newKieSession("ksession-backward-chaining");
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// drools session base on the xml configuration (<strong>kmodule.xml</strong>)
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// graph population
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kSession.insert(new Beatle("Starr", "drums"));
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kSession.insert(new Beatle("McCartney", "bass"));
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kSession.insert(new Beatle("Lennon", "guitar"));
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kSession.insert(new Beatle("Harrison", "guitar"));
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kSession.insert("Ringo"); // invoke the rule that calls the query implentation of backward chaining
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kSession.fireAllRules(); // invoke all the rules
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}
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}
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package com.baeldung.model;
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import org.kie.api.definition.type.Position;
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public class Beatle {
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@Position(0)
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private String lastName;
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@Position(1)
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private String instrument;
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public Beatle(String lastName, String instrument) {
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this.lastName = lastName;
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this.instrument = instrument;
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}
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public String getInstrument() {
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return instrument;
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}
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public void setInstrument(String instrument) {
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this.instrument = instrument;
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}
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public String getLastName() {
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return lastName;
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}
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public void setLastName(String lastName) {
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this.lastName = lastName;
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
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<kbase name="backward_chaining" packages="backward_chaining">
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<ksession name="ksession-backward-chaining"/>
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</kbase>
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</kmodule>
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package com.baeldung
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import com.baeldung.model.Beatle;
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query whichBeatle(String lastName, String instrument)
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Beatle(lastName, instrument;)
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or
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(Beatle(lastName, null;)
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and
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whichBeatle(null, instrument;)) //recursive call to the function that allows to search in a derivation tree structure
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end
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rule "Ringo"
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when
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String(this == "Ringo")
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whichBeatle("Starr", "drums";)
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then
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System.out.println("The beatle is Ringo Starr");
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end
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rule "Paul"
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when
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String(this == "Paul")
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whichBeatle("McCartney", "bass";)
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then
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System.out.println("The beatle is Paul McCartney");
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end
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rule "John"
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when
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String(this == "John")
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whichBeatle("Lennon", "guitar";)
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then
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System.out.println("The beatle is John Lennon");
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end
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rule "George"
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when
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String(this == "George")
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whichBeatle("Harrison", "guitar";)
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then
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System.out.println("The beatle is George Harrison");
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end
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