Basic drools json usage examples through unit test cases. / published by https://github.com/dacr/code-examples-manager #ea0953fa-188a-4ce3-b18d-65082c777577/478fd6f130c65b9088ebf4dcca3f8afbb822ecee

drools-basics-json.sc

// summary : Basic drools json usage examples through unit test cases.
// keywords : scala, drools, mvel, scalatest, ai, json, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : ea0953fa-188a-4ce3-b18d-65082c777577
// execution : scala ammonite script (http://ammonite.io/) - run as follow 'amm scriptname.sc'
// created-on : 2019-10-01T10:52:57+02:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file

// ---------------------
//> using scala "3.5.1"
//> using dep "fr.janalyse::drools-scripting:1.2.0"
//> using dep "org.scalatest::scalatest:3.2.19"
// ---------------------

import fr.janalyse.droolscripting.*, org.scalatest.*, flatspec.*, matchers.*, OptionValues.*
import DroolsEngineConfig.*

object BasicsJsonWithDroolsTest extends AnyFlatSpec with should.Matchers {
  override val suiteName = "BasicsJsonWithDroolsTest"

  "Drools" should "manage json inputs associated to simple mvel declarations" in {
    val drl =
      """package testdrools
        |
        |declare Someone
        |  name: String
        |end
        |
        |rule "hello" when
        |  Someone($name:name)
        |then
        |  insert("Hello "+$name);
        |end
        |""".stripMargin
    val engine = DroolsEngine(drl)
    engine.insertJson("""{"name":"John"}""", "testdrools.Someone")
    engine.fireAllRules()
    engine.getModelFirstInstance("testdrools.Someone") shouldBe defined
    engine.getModelFirstInstance("java.lang.String").value shouldBe "Hello John"
    engine.dispose()
  }

  it should "manage json inputs associated to more complex mvel declarations" in {
    val drl =
      """package testdrools
        |
        |declare Address
        |  street:String
        |  town:String
        |  country:String
        |end
        |
        |declare Someone
        |  name: String
        |  age: int
        |  surnames: String[]
        |  address: Address
        |end
        |
        |rule "hello" when
        |  Someone($name:name, $address:address, $surnames:surnames, $country:address.country)
        |then
        |  insert("Hello "+$name+" "+$surnames.length+" "+$country);
        |end
        |""".stripMargin
    val engine = DroolsEngine(drl)
    val json =
      """
        |{
        |  "name": "John",
        |  "age": 42,
        |  "surnames": ["joe", "junior"],
        |  "address": {
        |    "street":"Somewhere",
        |    "town":"NoTown",
        |    "country":"France"
        |  }
        |}
        |""".stripMargin
    engine.insertJson(json, "testdrools.Someone")
    engine.fireAllRules()
    engine.getModelFirstInstance("java.lang.String").value shouldBe "Hello John 2 France"
    engine.dispose()
  }

  it should "be able to deal with ISO8601 json dates" in {
    val drl=
      """package test
        |import java.util.Date
        |declare Someone
        |  name:String
        |  birth:Date
        |end
        |""".stripMargin
    val engine = DroolsEngine(drl)
    engine.insertJson("""{"name":"joe", "birth":"2019-01-01T14:00:00Z"}""", "test.Someone")
    engine.fireAllRules()
    val people = engine.getModelInstances("test.Someone")
    info(people.mkString(","))
    people should have size 1
  }

  it should "be able to use enumerations" in {
    val drl=
      """package test
        |
        |declare enum Priority LOW(0), MEDIUM(1), HIGH(2);
        |  value: int
        |end
        |
        |declare enum Color RED("red"), GREEN("green"), BLUE("blue");
        |  name: String
        |end
        |
        |declare Combo
        |  priority:Priority
        |  color:Color
        |end
        |""".stripMargin
    val engine = DroolsEngine(drl)
    engine.insertJson(""""LOW"""", "test.Priority")
    engine.insertJson(""""RED"""", "test.Color")
    engine.insertJson("""{"priority":"LOW", "color":"GREEN"}""", "test.Combo")
    engine.fireAllRules()
    engine.getObjects should have size 3
    val combo = engine.getModelInstances("test.Combo").headOption.value
    combo.toString should include regex "LOW.*GREEN"
  }

}

BasicsJsonWithDroolsTest.execute()