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BAEL-803: Backward Chaining with Drools - changefix (#3020)

This commit is contained in:
felipeazv 2017-11-13 19:41:00 +01:00 committed by Grzegorz Piwowarek
parent f984b4a07c
commit 503fd2d24f
15 changed files with 105 additions and 311 deletions
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35
drools/backward-chaining/pom.xml
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@ -1,35 +0,0 @@
<?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>
<artifactId>drools-backward-chaining</artifactId>
<version>1.0</version>
<name>drools-backward-chaining</name>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<properties>
<runtime.version>6.4.0.Final</runtime.version>
</properties>
<dependencies>
<dependency>
<groupId>org.kie</groupId>
<artifactId>kie-api</artifactId>
<version>${runtime.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<version>${runtime.version}</version>
</dependency>
<dependency>
<groupId>org.drools</groupId>
<artifactId>drools-decisiontables</artifactId>
<version>${runtime.version}</version>
</dependency>
</dependencies>
</project>

28
drools/backward-chaining/src/main/java/com/baeldung/BackwardChainingBeatles.java
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@ -1,28 +0,0 @@
package com.baeldung;
import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import com.baeldung.model.Beatle;
public class BackwardChainingBeatles {
public static void main(String[] args) {
KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession kSession = kContainer.newKieSession("ksession-backward-chaining");
// drools session base on the xml configuration (<strong>kmodule.xml</strong>)
// graph population
kSession.insert(new Beatle("Starr", "drums"));
kSession.insert(new Beatle("McCartney", "bass"));
kSession.insert(new Beatle("Lennon", "guitar"));
kSession.insert(new Beatle("Harrison", "guitar"));
kSession.insert("Ringo"); // invoke the rule that calls the query implentation of backward chaining
kSession.fireAllRules(); // invoke all the rules
}
}

33
drools/backward-chaining/src/main/java/com/baeldung/model/Beatle.java
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@ -1,33 +0,0 @@
package com.baeldung.model;
import org.kie.api.definition.type.Position;
public class Beatle {
@Position(0)
private String lastName;
@Position(1)
private String instrument;
public Beatle(String lastName, String instrument) {
this.lastName = lastName;
this.instrument = instrument;
}
public String getInstrument() {
return instrument;
}
public void setInstrument(String instrument) {
this.instrument = instrument;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}

6
drools/backward-chaining/src/main/resources/META-INF/kmodule.xml
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@ -1,6 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
<kbase name="backward_chaining" packages="backward_chaining">
<ksession name="ksession-backward-chaining"/>
</kbase>
</kmodule>

3
drools/backward-chaining/src/main/resources/META-INF/maven/pom.properties
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@ -1,3 +0,0 @@
groupId=com.baeldung.drools
artifactId=DroosBackwardChaining
version=1.0.0-SNAPSHOT

44
drools/backward-chaining/src/main/resources/backward_chaining/Beatles.drl
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@ -1,44 +0,0 @@
package com.baeldung
import com.baeldung.model.Beatle;
query whichBeatle(String lastName, String instrument)
Beatle(lastName, instrument;)
or
(Beatle(lastName, null;)
and
whichBeatle(null, instrument;)) //recursive call to the function that allows to search in a derivation tree structure
end
rule "Ringo"
when
String(this == "Ringo")
whichBeatle("Starr", "drums";)
then
System.out.println("The beatle is Ringo Starr");
end
rule "Paul"
when
String(this == "Paul")
whichBeatle("McCartney", "bass";)
then
System.out.println("The beatle is Paul McCartney");
end
rule "John"
when
String(this == "John")
whichBeatle("Lennon", "guitar";)
then
System.out.println("The beatle is John Lennon");
end
rule "George"
when
String(this == "George")
whichBeatle("Harrison", "guitar";)
then
System.out.println("The beatle is George Harrison");
end

34
drools/backward-chaining/src/main/resources/backward_chaining/rules.drl
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@ -1,34 +0,0 @@
package com.baeldung
import com.baeldung.drools.model.Fact;
global com.baeldung.drools.model.Result result;
dialect "mvel"
query belongsTo(String x, String y)
Fact(x, y;)
or
(Fact(z, y;) and belongsTo(x, z;))
end
rule "Great Wall of China BELONGS TO Planet Earth"
when
belongsTo("Great Wall of China", "Planet Earth";)
then
result.setValue("Decision one taken: Great Wall of China BELONGS TO Planet Earth");
end
rule "Great Wall of China DOES NOT BELONG TO of Planet Earth"
when
not belongsTo("Great Wall of China", "Planet Earth";)
then
result.setValue("Decision two taken: Great Wall of China DOES NOT BELONG TO Planet Earth");
end
rule "print all facts"
when
belongsTo(element, place;)
then
result.addFact(element + " IS ELEMENT OF " + place);
end

54
drools/backward-chaining/src/test/java/com/baeldung/test/BackwardChainingTest.java
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@ -1,54 +0,0 @@
package com.baeldung.test;
import org.junit.Before;
import org.junit.Test;
import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import com.baeldung.drools.model.Fact;
import com.baeldung.drools.model.Result;
import static junit.framework.TestCase.assertEquals;
public class BackwardChainingTest {
private Result result;
private KieServices ks;
private KieContainer kContainer;
private KieSession ksession;
@Before
public void before() {
result = new Result();
ks = KieServices.Factory.get();
kContainer = ks.getKieClasspathContainer();
ksession = kContainer.newKieSession("ksession-backward-chaining");
ksession.setGlobal("result", result);
}
@Test
public void whenWallOfChinaIsGiven_ThenItBelongsToPlanetEarth() {
ksession.setGlobal("result", result);
ksession.insert(new Fact("Asia", "Planet Earth"));
ksession.insert(new Fact("China", "Asia"));
ksession.insert(new Fact("Great Wall of China", "China"));
ksession.fireAllRules();
// Assert Decision one
assertEquals(result.getValue(), "Decision one taken: Great Wall of China BELONGS TO Planet Earth");
}
@Test
public void whenChinaIsNotGiven_ThenWallOfChinaDoesNotBelongToPlanetEarth() {
ksession.insert(new Fact("Asia", "Planet Earth"));
// ksession.insert(new Location("China", "Asia")); // not provided to force Decision two
ksession.insert(new Fact("Great Wall of China", "China"));
ksession.fireAllRules();
// Assert Decision two
assertEquals(result.getValue(), "Decision two taken: Great Wall of China DOES NOT BELONG TO Planet Earth");
}
}

7
drools/pom.xml
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@ -1,14 +1,9 @@
<?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"
<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>drools</artifactId>
<version>1.0.0-SNAPSHOT</version>
<packaging>pom</packaging>
<parent>
<groupId>com.baeldung</groupId>

15
drools/backward-chaining/src/main/java/com/baeldung/drools/BackwardChaining.java → drools/src/main/java/com/baeldung/drools/backward_chaining/BackwardChaining.java
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@ -1,9 +1,8 @@
package com.baeldung.drools;
package com.baeldung.drools.backward_chaining;
import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
import com.baeldung.drools.config.DroolsBeanFactory;
import com.baeldung.drools.model.Fact;
import com.baeldung.drools.model.Result;
@ -11,17 +10,17 @@ public class BackwardChaining {
public static void main(String[] args) {
Result result = new BackwardChaining().backwardChaining();
System.out.println(result.getValue());
result.getFacts().stream().forEach(System.out::println);
result.getFacts()
.stream()
.forEach(System.out::println);
}
public Result backwardChaining() {
Result result = new Result();
KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession ksession = kContainer.newKieSession("ksession-backward-chaining");
KieSession ksession = new DroolsBeanFactory().getKieSession();
ksession.setGlobal("result", result);
ksession.insert(new Fact("Asia", "Planet Earth"));
// ksession.insert(new Fact("China", "Asia"));
ksession.insert(new Fact("China", "Asia"));
ksession.insert(new Fact("Great Wall of China", "China"));
ksession.fireAllRules();

5
drools/src/main/java/com/baeldung/drools/config/DroolsBeanFactory.java
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@ -3,7 +3,6 @@ package com.baeldung.drools.config;
import org.drools.decisiontable.DecisionTableProviderImpl;
import org.kie.api.KieServices;
import org.kie.api.builder.*;
import org.kie.api.io.KieResources;
import org.kie.api.io.Resource;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;
@ -22,7 +21,7 @@ public class DroolsBeanFactory {
private KieFileSystem getKieFileSystem() throws IOException{
KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
List<String> rules=Arrays.asList("SuggestApplicant.drl","Product_rules.xls");
List<String> rules=Arrays.asList("BackwardChaining.drl","SuggestApplicant.drl","Product_rules.xls");
for(String rule:rules){
kieFileSystem.write(ResourceFactory.newClassPathResource(rule));
}
@ -56,9 +55,11 @@ public class DroolsBeanFactory {
getKieRepository();
KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
kieFileSystem.write(ResourceFactory.newClassPathResource("com/baeldung/drools/rules/BackwardChaining.drl"));
kieFileSystem.write(ResourceFactory.newClassPathResource("com/baeldung/drools/rules/SuggestApplicant.drl"));
kieFileSystem.write(ResourceFactory.newClassPathResource("com/baeldung/drools/rules/Product_rules.xls"));
KieBuilder kb = kieServices.newKieBuilder(kieFileSystem);
kb.buildAll();
KieModule kieModule = kb.getKieModule();

0
drools/backward-chaining/src/main/java/com/baeldung/drools/model/Fact.java → drools/src/main/java/com/baeldung/drools/model/Fact.java
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0
drools/backward-chaining/src/main/java/com/baeldung/drools/model/Result.java → drools/src/main/java/com/baeldung/drools/model/Result.java
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2
drools/backward-chaining/src/main/resources/com/baeldung/drools/backward_chaining/rules.drl → drools/src/main/resources/com/baeldung/drools/rules/BackwardChaining.drl
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@ -1,4 +1,4 @@
package com.baeldung
package com.baeldung.drools.rules
import com.baeldung.drools.model.Fact;

36
drools/src/test/java/com/baeldung/drools/backward_chaining/BackwardChainingTest.java Normal file
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@ -0,0 +1,36 @@
package com.baeldung.drools.backward_chaining;
import org.junit.Before;
import org.junit.Test;
import org.kie.api.runtime.KieSession;
import com.baeldung.drools.config.DroolsBeanFactory;
import com.baeldung.drools.model.Fact;
import com.baeldung.drools.model.Result;
import static junit.framework.TestCase.assertEquals;
public class BackwardChainingTest {
private Result result;
private KieSession ksession;
@Before
public void before() {
result = new Result();
ksession = new DroolsBeanFactory().getKieSession();
}
@Test
public void whenWallOfChinaIsGiven_ThenItBelongsToPlanetEarth() {
ksession.setGlobal("result", result);
ksession.insert(new Fact("Asia", "Planet Earth"));
ksession.insert(new Fact("China", "Asia"));
ksession.insert(new Fact("Great Wall of China", "China"));
ksession.fireAllRules();
// Assert Decision one
assertEquals(result.getValue(), "Decision one taken: Great Wall of China BELONGS TO Planet Earth");
}
}