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validation engine template
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| import scala.concurrent.Future | |
| import scala.concurrent.ExecutionContext.Implicits.global | |
| trait Request | |
| case class AdhocCreateRequest(name: String) extends Request | |
| case class RegularCreateRequest(name: String) extends Request | |
| class Repository { | |
| def doSomething = println("hello from repository") | |
| } | |
| abstract class ValidationRule[T] { | |
| def isSupported(t: T): Boolean | |
| def validate(t: T): Future[Unit] | |
| } | |
| class RootValidationRule[T](val maybeSuccessor: Option[ValidationRule[T]]) | |
| extends ValidationRule[T] { | |
| def isSupported(t: T): Boolean = true | |
| def validate(t: T): Future[Unit] = maybeSuccessor.fold(Future.unit)(_.validate(t)) | |
| } | |
| class FieldValidationRule[T](val maybeSuccessor: Option[ValidationRule[T]]) | |
| extends ValidationRule[T] { | |
| def isSupported(t: T): Boolean = t.getClass() == classOf[AdhocCreateRequest] | |
| def validate(t: T): Future[Unit] = isSupported(t) match { | |
| case true => | |
| println(s"validating request $t") | |
| val request = t.asInstanceOf[AdhocCreateRequest] | |
| Future {} | |
| case _ => maybeSuccessor.fold(Future.unit)(_.validate(t)) | |
| } | |
| } | |
| class OverlapValidationRule[T](val maybeSuccessor: Option[ValidationRule[T]])(implicit repository: Repository) | |
| extends ValidationRule[T] { | |
| def isSupported(t: T): Boolean = t.getClass() == classOf[RegularCreateRequest] | |
| def validate(t: T): Future[Unit] = isSupported(t) match { | |
| case true => | |
| println(s"validating request $t") | |
| val request = t.asInstanceOf[RegularCreateRequest] | |
| Future { | |
| repository.doSomething | |
| throw new Exception("Invalid request is overlapping") | |
| } | |
| case _ => | |
| println(s"$t skipping ${classOf[OverlapValidationRule[T]]}") | |
| maybeSuccessor.fold(Future.unit)(_.validate(t)) | |
| } | |
| } | |
| object ValidationEngine extends App { | |
| implicit val repository = new Repository | |
| val fieldValidationRule = new FieldValidationRule[Request](None) | |
| val overlapValidationRule = new OverlapValidationRule[Request](Some(fieldValidationRule)) | |
| val rootValidationRule = new RootValidationRule(Some(overlapValidationRule)) | |
| val adhocCreate = AdhocCreateRequest("create adhoc schedule") | |
| val regularCreate = RegularCreateRequest("create regular schedule") | |
| rootValidationRule.validate(adhocCreate) | |
| rootValidationRule.validate(regularCreate) | |
| } |
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