Loading a .drl file and running a stateless Drools 6 session using Scala.

CampaignSelector.java

import java.io.File
import java.util.{ArrayList, List}

import com.typesafe.scalalogging.LazyLogging
import org.kie.api.KieServices
import org.kie.api.io.ResourceType


/**
 * Created by Viddu on 12/12/2015.
 */
object CampaignSelector extends LazyLogging {
  // KieServices is the factory for all KIE services
  val kieServices: KieServices = KieServices.Factory.get()

  val file = new File("src/main/resources/com/github/rdc/CampaignRules.drl")
  val resource = kieServices.getResources().newFileSystemResource(file).setResourceType(ResourceType.DRL)
  val kFileSystem = kieServices.newKieFileSystem().write(resource)
  kieServices.newKieBuilder(kFileSystem).buildAll()
  // kieModule is automatically deployed to KieRepository if successfully built.
  val kc = kieServices.newKieContainer(kieServices.getRepository().getDefaultReleaseId())


  def select(context: Context): List[Campaign] = {
    val ksession = kc.newKieSession()
    val campaigns = new ArrayList[Campaign]()
    ksession.setGlobal("campaignList", campaigns)
    ksession.insert(context)
    ksession.fireAllRules()
    ksession.dispose()
    return campaigns
  }

}