BAEL-5143 (#11273)
* BAEL-5143 * Modified as per PR comments * The List<> type for session data is changed to a more generic Collection<> * Version upgrade Co-authored-by: 0swald <andrey.bichkevskiy@gmail.com>
This commit is contained in:
Andrey Bichkevski
GitHub
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commit
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35
rule-engines/evrete/pom.xml
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35
rule-engines/evrete/pom.xml
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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"
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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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<groupId>com.baeldung.evrete</groupId>
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<artifactId>evrete</artifactId>
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<version>1.0</version>
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<name>evrete</name>
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<properties>
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<evrete.version>2.1.04</evrete.version>
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</properties>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>rule-engines</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<dependencies>
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<!-- Core library -->
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<dependency>
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<groupId>org.evrete</groupId>
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<artifactId>evrete-core</artifactId>
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<version>${evrete.version}</version>
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</dependency>
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<!-- Annotated Java classes -->
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<dependency>
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<groupId>org.evrete</groupId>
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<artifactId>evrete-dsl-java</artifactId>
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<version>${evrete.version}</version>
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</dependency>
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</dependencies>
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</project>
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package com.baeldung.evrete.introduction;
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import com.baeldung.evrete.introduction.model.Customer;
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import com.baeldung.evrete.introduction.model.Invoice;
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import org.evrete.KnowledgeService;
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import org.evrete.api.Knowledge;
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import java.io.IOException;
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import java.net.URL;
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import java.util.*;
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public class IntroductionAJR {
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public static void main(String[] args) throws IOException {
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ClassLoader classLoader = IntroductionAJR.class.getClassLoader();
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KnowledgeService service = new KnowledgeService();
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URL rulesetUrl = classLoader.getResource("rules/SalesRuleset.java");
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Knowledge knowledge = service.newKnowledge(
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"JAVA-SOURCE",
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rulesetUrl
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);
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List<Customer> customers = Arrays.asList(
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new Customer("Customer A"),
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new Customer("Customer B"),
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new Customer("Customer C")
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);
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Random random = new Random();
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Collection<Object> sessionData = new LinkedList<>(customers);
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for (int i = 0; i < 100_000; i++) {
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Customer randomCustomer = customers.get(random.nextInt(customers.size()));
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Invoice invoice = new Invoice(randomCustomer, 100 * random.nextDouble());
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sessionData.add(invoice);
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}
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knowledge
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.newStatelessSession()
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.insert(sessionData)
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.fire();
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for (Customer c : customers) {
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System.out.printf("%s:\t$%,.2f%n", c.getName(), c.getTotal());
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}
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service.shutdown();
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}
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}
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package com.baeldung.evrete.introduction;
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import org.evrete.KnowledgeService;
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import org.evrete.api.Knowledge;
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import com.baeldung.evrete.introduction.model.*;
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import java.util.*;
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public class IntroductionInline {
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public static void main(String[] args) {
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KnowledgeService service = new KnowledgeService();
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Knowledge knowledge = service
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.newKnowledge()
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.newRule("Clear total sales")
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.forEach("$c", Customer.class)
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.execute(ctx -> {
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Customer c = ctx.get("$c");
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c.setTotal(0.0);
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})
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.newRule("Compute totals")
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.forEach(
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"$c", Customer.class,
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"$i", Invoice.class
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)
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.where("$i.customer == $c")
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.execute(ctx -> {
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Customer c = ctx.get("$c");
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Invoice i = ctx.get("$i");
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c.addToTotal(i.getAmount());
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});
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List<Customer> customers = Arrays.asList(
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new Customer("Customer A"),
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new Customer("Customer B"),
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new Customer("Customer C")
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);
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Random random = new Random();
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Collection<Object> sessionData = new LinkedList<>(customers);
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for (int i = 0; i < 100_000; i++) {
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Customer randomCustomer = customers.get(random.nextInt(customers.size()));
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Invoice invoice = new Invoice(randomCustomer, 100 * random.nextDouble());
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sessionData.add(invoice);
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}
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knowledge
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.newStatelessSession()
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.insert(sessionData)
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.fire();
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for (Customer c : customers) {
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System.out.printf("%s:\t$%,.2f%n", c.getName(), c.getTotal());
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}
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service.shutdown();
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}
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}
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package com.baeldung.evrete.introduction.model;
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public class Customer {
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private double total = 0.0;
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private final String name;
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public Customer(String name) {
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this.name = name;
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}
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public void addToTotal(double amount) {
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this.total += amount;
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}
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public String getName() {
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return name;
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}
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public double getTotal() {
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return total;
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}
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public void setTotal(double total) {
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this.total = total;
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}
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}
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package com.baeldung.evrete.introduction.model;
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public class Invoice {
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private final Customer customer;
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private final double amount;
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public Invoice(Customer customer, double amount) {
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this.customer = customer;
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this.amount = amount;
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}
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public Customer getCustomer() {
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return customer;
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}
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public double getAmount() {
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return amount;
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}
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}
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13
rule-engines/evrete/src/main/resources/logback.xml
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13
rule-engines/evrete/src/main/resources/logback.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder>
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<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
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</pattern>
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</encoder>
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</appender>
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<root level="INFO">
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<appender-ref ref="STDOUT" />
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</root>
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</configuration>
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package org.abc.author1;
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import com.baeldung.evrete.introduction.model.Customer;
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import com.baeldung.evrete.introduction.model.Invoice;
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import org.evrete.dsl.annotation.Rule;
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import org.evrete.dsl.annotation.Where;
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public class SalesRuleset {
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@Rule
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public void rule1(Customer $c) {
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$c.setTotal(0.0);
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}
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@Rule
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@Where("$i.customer == $c")
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public void rule2(Customer $c, Invoice $i) {
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$c.addToTotal($i.getAmount());
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}
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}
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package com.baeldung.evrete.introduction;
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import com.baeldung.evrete.introduction.model.Customer;
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import com.baeldung.evrete.introduction.model.Invoice;
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import org.evrete.KnowledgeService;
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import org.evrete.api.Knowledge;
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import org.evrete.api.RuleSession;
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import org.junit.jupiter.api.AfterAll;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.ValueSource;
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import java.io.IOException;
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import java.util.*;
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class IntroductionAJRUnitTest {
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private static KnowledgeService service;
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@BeforeAll
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static void setUpClass() {
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service = new KnowledgeService();
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}
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@AfterAll
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static void shutDownClass() {
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service.shutdown();
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}
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/**
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* This test makes sure that each customer's actual total sales is equal to the amount
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* computed by the rule engine
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*/
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@ParameterizedTest
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@ValueSource(strings = {"true", "false"})
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void sessionTotalsTest(String type) throws IOException {
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boolean stateful = Boolean.parseBoolean(type);
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ClassLoader classLoader = IntroductionAJR.class.getClassLoader();
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KnowledgeService service = new KnowledgeService();
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Knowledge knowledge = service
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.newKnowledge(
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"JAVA-SOURCE",
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classLoader.getResource("rules/SalesRuleset.java")
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);
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List<Customer> customers = Arrays.asList(
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new Customer("Customer A"),
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new Customer("Customer B"),
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new Customer("Customer C")
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);
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Collection<Object> sessionData = new LinkedList<>(customers);
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HashMap<Customer, Double> actualTotals = new HashMap<>();
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Random random = new Random();
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for (int i = 0; i < 1_000; i++) {
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Customer randomCustomer = customers.get(random.nextInt(customers.size()));
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Invoice invoice = new Invoice(randomCustomer, random.nextInt(100));
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sessionData.add(invoice);
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Double d = actualTotals.get(randomCustomer);
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if(d == null) {
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d = 0.0;
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}
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d = d + invoice.getAmount();
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actualTotals.put(randomCustomer, d);
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}
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RuleSession<?> session = stateful ? knowledge.newStatefulSession() : knowledge.newStatelessSession();
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session
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.insert(sessionData)
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.fire();
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for(Customer c : customers) {
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double d1 = c.getTotal();
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double d2 = actualTotals.get(c);
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assert d1 == d2;
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}
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}
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}
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@ -0,0 +1,90 @@
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package com.baeldung.evrete.introduction;
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import com.baeldung.evrete.introduction.model.Customer;
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import com.baeldung.evrete.introduction.model.Invoice;
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import org.evrete.KnowledgeService;
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import org.evrete.api.Knowledge;
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import org.evrete.api.RuleSession;
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import org.junit.jupiter.api.AfterAll;
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import org.junit.jupiter.api.BeforeAll;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.ValueSource;
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import java.util.*;
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class IntroductionInlineUnitTest {
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private static KnowledgeService service;
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@BeforeAll
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static void setUpClass() {
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service = new KnowledgeService();
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}
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@AfterAll
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static void shutDownClass() {
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service.shutdown();
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}
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/**
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* This test makes sure that each customer's actual total sales is equal to the amount
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* computed by the rule engine
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*/
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@ParameterizedTest
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@ValueSource(strings = {"true", "false"})
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void sessionTotalsTest(String type) {
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boolean stateful = Boolean.parseBoolean(type);
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Knowledge knowledge = service
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.newKnowledge()
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.newRule("Clear customer's total sales")
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.forEach("$c", Customer.class)
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.execute(ctx -> {
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Customer c = ctx.get("$c");
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c.setTotal(0.0);
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})
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.newRule("Compute totals")
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.forEach(
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"$c", Customer.class,
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"$i", Invoice.class
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)
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.where("$i.customer == $c")
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.execute(ctx -> {
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Customer c = ctx.get("$c");
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Invoice i = ctx.get("$i");
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c.addToTotal(i.getAmount());
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});
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List<Customer> customers = Arrays.asList(
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new Customer("Customer A"),
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new Customer("Customer B"),
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new Customer("Customer C")
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);
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Collection<Object> sessionData = new LinkedList<>(customers);
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HashMap<Customer, Double> actualTotals = new HashMap<>();
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Random random = new Random();
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for (int i = 0; i < 1_000; i++) {
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Customer randomCustomer = customers.get(random.nextInt(customers.size()));
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Invoice invoice = new Invoice(randomCustomer, random.nextInt(100));
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sessionData.add(invoice);
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Double d = actualTotals.get(randomCustomer);
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if(d == null) {
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d = 0.0;
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}
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d = d + invoice.getAmount();
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actualTotals.put(randomCustomer, d);
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}
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RuleSession<?> session = stateful ? knowledge.newStatefulSession() : knowledge.newStatelessSession();
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session
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.insert(sessionData)
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.fire();
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for(Customer c : customers) {
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double d1 = c.getTotal();
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double d2 = actualTotals.get(c);
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assert d1 == d2;
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}
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}
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}
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@ -15,6 +15,7 @@
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<modules>
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<module>easy-rules</module>
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<module>evrete</module>
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<module>openl-tablets</module>
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<module>rulebook</module>
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<!-- <module>jess</module> --> <!-- requires dependencies which are not publicly available -->
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