Employee-Self-Service: Reactive and Non-Blocking Database Access using Play Framework and Anorm – (Part-4)

def list() = Action.async { implicit request =>
 val futureEmpList = scala.concurrent.Future { Employee.list }
 val timeoutFuture = Promise.timeout("Oops", 10.second)
 Future.firstCompletedOf(Seq(futureEmpList, timeoutFuture)).map {
   case data: List[Employee] => Ok(html.list(data))
   case t: String =>
      Logger.error("Problem found in employee list process")
      InternalServerError(t)
   }
}

/**
 * Display the paginated list of employees.
 *
 * @param page Current page number (starts from 0)
 * @param orderBy Column to be sorted
 * @param filter Filter applied on employee names
 */
 def list(page: Int, orderBy: Int, filter: String) = Action.async { implicit request =>
   val futurePage: Future[Page[Employee]] = TimeoutFuture(Employee.list(page = page, orderBy = orderBy, filter = ("%" + filter + "%")))
   futurePage.map(page => Ok(html.list(page, orderBy, filter))).recover {
     case t: TimeoutException =>
       Logger.error("Problem found in employee list process")
       InternalServerError(t.getMessage)
   }
 }

object TimeoutFuture {

    def apply[A](block: => A)(implicit timeout: FiniteDuration): Future[A] = {

      val promise = scala.concurrent.promise[A]()

      // if the promise doesn't have a value yet then this completes the future with a failure
      Promise.timeout(Nil, timeout).map(_ => promise.tryFailure(new TimeoutException("This operation timed out")))

      // this tries to complete the future with the value from block
      Future(promise.success(block))

      promise.future
    }

}

"org.webjars" %% "webjars-play" % "2.2.2-1",
"org.webjars" % "bootstrap" % "3.1.0",
"org.webjars" % "bootswatch-yeti" % "3.1.1",
"org.webjars" % "html5shiv" % "3.7.0",
"org.webjars" % "respond" % "1.4.2"

# Map the webjar static assets to the /webjars URL
GET     /webjars/*file                    controllers.WebJarAssets.at(file)

<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" media="screen" href="@routes.WebJarAssets.at(WebJarAssets.locate("bootswatch-yeti", "bootstrap.min.css"))">

<!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]>
  <script src="@routes.WebJarAssets.at(WebJarAssets.locate("html5shiv.js"))"></script>
  <script src="@routes.WebJarAssets.at(WebJarAssets.locate("respond.min.js"))"></script>
<![endif]-->

<!-- Bootstrap core JavaScript
================================================== -->
<!-- Placed at the end of the document so the pages load faster -->
<script src="@routes.WebJarAssets.at(WebJarAssets.locate("jquery.min.js"))"></script>
        
<!-- Latest compiled and minified JavaScript -->
<script src="@routes.WebJarAssets.at(WebJarAssets.locate("bootswatch-yeti", "bootstrap.min.js"))"></script>