Simple Web Chat ver 1

app_actors_ChatActor.scala

package actors

import actors.ChatActor.{SendMessage, Tick}
import akka.actor.{Actor, ActorRef, ActorSystem, Props}
import tasks.KeepAliveTask

class ChatActor(out: ActorRef, manager: ActorRef) extends Actor{

  manager ! ChatManager.NewChatter(self)

  override def receive: Receive = {
    case s: String => manager ! ChatManager.Message(s)
    case SendMessage(msg) => out ! msg
    case Tick => println("tick")
  }
}

object ChatActor {
  def props(out: ActorRef,manager: ActorRef) = Props(new ChatActor(out, manager))
  case class SendMessage(msg: String)
  object Tick
}

app_actors_ChatManager.scala

package actors

import actors.ChatActor.Tick
import actors.ChatManager.{LogoutMessage, Message, NewChatter}
import akka.actor.{Actor, ActorRef}

class ChatManager extends Actor{
  private var chatters = List.empty[ActorRef]

  override def receive: Receive = {
    case "tick009" => for (c <- chatters) c ! "tick009"
    case NewChatter(chatter) => chatters ::= chatter
    case Message(msg) => for (c <- chatters) c ! ChatActor.SendMessage(msg)
    case LogoutMessage(username) => for (c <- chatters) c ! ChatActor.SendMessage("Logged out user: "+username)
  }
}

object ChatManager {
  case class LogoutMessage(username: String)
  case class NewChatter(chatter: ActorRef)
  case class Message(msg: String)
}

app_actors_TickActor.scala

package actors

import actors.TickActor.{SendMessage, Tick}
import akka.actor.{Actor, ActorRef, Props}

class TickActor(out: ActorRef, manager: ActorRef) extends Actor{
  manager ! ChatManager.NewChatter(self)

  override def receive: Receive = {
    case s: String => manager ! ChatManager.Message(s)
    case SendMessage(msg) => out ! msg
    case Tick => out ! "tick"
  }
}

object TickActor {
  def props(out: ActorRef,manager: ActorRef) = Props(new TickActor(out, manager))
  case class SendMessage(msg: String)
  object Tick
}

app_controllers_AsyncController.scala

package controllers

import javax.inject._

import akka.actor.ActorSystem
import play.api.mvc._

import scala.concurrent.duration._
import scala.concurrent.{ExecutionContext, Future, Promise}

/**
 * This controller creates an `Action` that demonstrates how to write
 * simple asynchronous code in a controller. It uses a timer to
 * asynchronously delay sending a response for 1 second.
 *
 * @param cc standard controller components
 * @param actorSystem We need the `ActorSystem`'s `Scheduler` to
 * run code after a delay.
 * @param exec We need an `ExecutionContext` to execute our
 * asynchronous code.  When rendering content, you should use Play's
 * default execution context, which is dependency injected.  If you are
 * using blocking operations, such as database or network access, then you should
 * use a different custom execution context that has a thread pool configured for
 * a blocking API.
 */
@Singleton
class AsyncController @Inject()(cc: ControllerComponents, actorSystem: ActorSystem)(implicit exec: ExecutionContext) extends AbstractController(cc) {

  /**
   * Creates an Action that returns a plain text message after a delay
   * of 1 second.
   *
   * The configuration in the `routes` file means that this method
   * will be called when the application receives a `GET` request with
   * a path of `/message`.
   */
  def message = Action.async {
    getFutureMessage(1.second).map { msg => Ok(msg) }
  }

  private def getFutureMessage(delayTime: FiniteDuration): Future[String] = {
    val promise: Promise[String] = Promise[String]()
    actorSystem.scheduler.scheduleOnce(delayTime) {
      promise.success("Hi!")
    }(actorSystem.dispatcher) // run scheduled tasks using the actor system's dispatcher
    promise.future
  }

}

app_controllers_CountController.scala

package controllers

import javax.inject._

import play.api.mvc._
import services.Counter

/**
 * This controller demonstrates how to use dependency injection to
 * bind a component into a controller class. The class creates an
 * `Action` that shows an incrementing count to users. The [[Counter]]
 * object is injected by the Guice dependency injection system.
 */
@Singleton
class CountController @Inject() (cc: ControllerComponents,
                                 counter: Counter) extends AbstractController(cc) {

  /**
   * Create an action that responds with the [[Counter]]'s current
   * count. The result is plain text. This `Action` is mapped to
   * `GET /count` requests by an entry in the `routes` config file.
   */
  def count = Action { Ok(counter.nextCount().toString) }

}

app_controllers_HomeController.scala

package controllers

import javax.inject._
import play.api.mvc._

/**
 * This controller creates an `Action` to handle HTTP requests to the
 * application's home page.
 */
@Singleton
class HomeController @Inject()(cc: ControllerComponents) extends AbstractController(cc) {

  /**
   * Create an Action to render an HTML page with a welcome message.
   * The configuration in the `routes` file means that this method
   * will be called when the application receives a `GET` request with
   * a path of `/`.
   */
  def index = Action {
    Ok(views.html.index("Your new application is ready."))
  }

}

app_controllers_TaskList3.scala

package controllers

import javax.inject.{Inject, Singleton}
import models.{TaskListInMemoryModel, UserData}
import play.api.libs.json.{JsError, JsSuccess, Json, Reads}
import play.api.mvc.{AbstractController, AnyContent, ControllerComponents, Request, Result}

@Singleton
class TaskList3 @Inject()(cc: ControllerComponents) extends AbstractController(cc) with play.api.i18n.I18nSupport {

  implicit val UserDataReads: Reads[UserData] = Json.reads[UserData]

  def load = Action { implicit request =>
    Ok(views.html.version4Main())
  }

  def withJsonBody[A](f: A => Result)(implicit request: Request[AnyContent], reads: Reads[A]) = {
    request.body.asJson.map { body =>
      Json.fromJson[A](body) match {
        case JsSuccess(a, path) => f(a)
        case e @ JsError(_) => Redirect(routes.TaskList3.load())
      }
    }.getOrElse(Redirect(routes.TaskList3.load()))
  }

  def withSessionUsername(f: String => Result)(implicit request: Request[AnyContent]) = {
    request.session.get("username").map(f).getOrElse(Ok(Json.toJson(Seq.empty[String])))
  }


  def validate = Action { implicit request =>
    request.body.asJson.map { body=>
      Json.fromJson[UserData](body) match {
        case JsSuccess(ud, path) =>
          val username = ud.username
          val password = ud.password
          if (TaskListInMemoryModel.validateUser(username, password)) {
            Ok(Json.toJson(true))
              .withSession("username" -> username, "csrfToken" -> play.filters.csrf.CSRF.getToken.get.value)
          }else {
            Ok(Json.toJson(false))
          }
        case e @ JsError(_) => Redirect(routes.TaskList3.load())
      }
    }.getOrElse(Redirect(routes.TaskList3.load()))
  }

  def createUser = Action { implicit request =>
    request.body.asJson.map { body=>
      Json.fromJson[UserData](body) match {
        case JsSuccess(ud, path) =>
          val username = ud.username
          val password = ud.password
          if (TaskListInMemoryModel.createUser(username, password)) {
            Ok(Json.toJson(true))
              .withSession("username" -> username, "csrfToken" -> play.filters.csrf.CSRF.getToken.get.value)
          }else {
            Ok(Json.toJson(false))
          }
        case e @ JsError(_) => Redirect(routes.TaskList3.load())
      }
    }.getOrElse(Redirect(routes.TaskList3.load()))
  }

  def taskList = Action {implicit request =>
    val usernameOption = request.session.get("username")
    usernameOption.map { username =>
      Ok(Json.toJson(TaskListInMemoryModel.getTasks(username)))
    }.getOrElse(Ok(Json.toJson(Seq.empty[String])))
  }

  def addTask = Action { implicit request =>
    val usernameOption = request.session.get("username")
    usernameOption.map { username =>

      request.body.asJson.map { body =>
        Json.fromJson[String](body) match {
          case JsSuccess(task, path) => {
            TaskListInMemoryModel.addTask(username, task);
            Ok(Json.toJson(true))
        }
          case e @ JsError(_) => Redirect(routes.TaskList3.load())
        }
      }.getOrElse(Ok(Json.toJson(false)))
    }.getOrElse(Ok(Json.toJson(false)))
  }


  def delete = Action { implicit request =>
    val usernameOption = request.session.get("username")
    usernameOption.map { username =>

      request.body.asJson.map { body =>
        Json.fromJson[Int](body) match {
          case JsSuccess(taskNumber, path) => {
            TaskListInMemoryModel.removeTask(username, taskNumber);
            Ok(Json.toJson(true))
          }
          case e @ JsError(_) => Redirect(routes.TaskList3.load())
        }
      }.getOrElse(Ok(Json.toJson(false)))
    }.getOrElse(Ok(Json.toJson(false)))
  }

  def logout = Action {
    Redirect(routes.TaskList3.load()).withNewSession
  }


}

app_controllers_TaskList4.scala

package controllers

import javax.inject.{Inject, Singleton}
import models.{TaskListInMemoryModel, UserData}
import play.api.libs.json.{JsError, JsSuccess, Json, Reads}
import play.api.mvc.{AbstractController, ControllerComponents}

@Singleton
class TaskList4 @Inject()(cc: ControllerComponents) extends AbstractController(cc) with play.api.i18n.I18nSupport {

  def load = Action { implicit request =>
    Ok(views.html.version5Main())
  }




}

app_controllers_TaskList5.scala

package controllers

import actors.ChatManager
import actors.ChatManager.LogoutMessage
import akka.actor.{ActorSystem, Props}
import akka.stream.Materializer
import javax.inject.{Inject, Singleton}
import models.{TaskItem, TaskListDatabaseModel, UserData}
import play.api.db.slick.{DatabaseConfigProvider, HasDatabaseConfigProvider}
import play.api.libs.json.{JsError, JsSuccess, Json, Reads, Writes}
import play.api.mvc.{AbstractController, AnyContent, ControllerComponents, Request, Result}
import play.mvc.Action
import slick.jdbc.JdbcProfile
import slick.jdbc.PostgresProfile.api._

import scala.concurrent.{ExecutionContext, Future}

@Singleton
class TaskList5 @Inject()(protected val dbConfigProvider: DatabaseConfigProvider, cc: ControllerComponents)(implicit ec: ExecutionContext)
  extends AbstractController(cc) with play.api.i18n.I18nSupport with HasDatabaseConfigProvider[JdbcProfile] {

  private val model = new TaskListDatabaseModel(db)

  def load = Action { implicit request =>
    Ok(views.html.version6Main())
  }

  implicit val UserDataReads: Reads[UserData] = Json.reads[UserData]
  implicit val itemDataWrites: Writes[TaskItem] = Json.writes[TaskItem]


  def withJsonBody[A](f: A => Future[Result])(implicit request: Request[AnyContent], reads: Reads[A]): Future[Result] = {
    request.body.asJson.map { body =>
      Json.fromJson[A](body) match {
        case JsSuccess(a, path) => f(a)
        case e@JsError(_) => Future.successful(Redirect(routes.TaskList5.load()))
      }
    }.getOrElse(Future.successful(Redirect(routes.TaskList5.load())))
  }

  def withSessionUsername(f: String => Future[Result])(implicit request: Request[AnyContent]): Future[Result] = {
    request.session.get("username").map(f).getOrElse(Future.successful(Ok(Json.toJson(Seq.empty[String]))))
  }

  def withSessionUserid(f: Int => Future[Result])(implicit request: Request[AnyContent]): Future[Result] = {
    request.session.get("userid").map(userid => f(userid.toInt)).getOrElse(Future.successful(Ok(Json.toJson(Seq.empty[String]))))
  }

  def validate = Action.async { implicit request =>
    withJsonBody[UserData] { ud =>
      model.validateUser(ud.username, ud.password, true).map {
        case Some(userid) =>
          Ok(Json.toJson(true))
            .withSession("username" -> ud.username, "userid" -> userid.toString, "csrfToken" -> play.filters.csrf.CSRF.getToken.map(_.value).getOrElse(""))
        case None =>
          Ok(Json.toJson(false))
      }
    }
  }

  def createUser = Action.async { implicit request =>
    withJsonBody[UserData] { ud =>
      model.createUser(ud.username, ud.password, false).map {
        case Some(userid) =>
          Ok(Json.toJson(true))
            .withSession("username" -> ud.username, "userid" -> userid.toString, "csrfToken" -> play.filters.csrf.CSRF.getToken.map(_.value).getOrElse(""))
        case None =>
          Ok(Json.toJson(false))
      }
    }
  }

  def taskList = Action.async { implicit request =>
    withSessionUsername { username =>
      model.getTasks(username).map(tasks => Ok(Json.toJson(tasks)))
    }
  }


  def addTask = Action.async { implicit request =>
    withSessionUserid { userid =>
      withJsonBody[String] { task =>
        model.addTask(userid, task).map(count => Ok(Json.toJson(count > 0)))
      }
    }
  }

  def delete = Action.async { implicit request =>
    withSessionUsername { username =>
      withJsonBody[Int] { itemId =>
        model.removeTask(itemId).map(removed => Ok(Json.toJson(removed)))
      }
    }
  }
//
//  def logout = Action { implicit request =>
//    Ok(Json.toJson(true)).withSession(request.session - "username")
//  }

  def logout = Action.async { implicit request =>
    withSessionUsername {username =>
      model.logoutUpdateStatus(username, false).map {
        case Some(_) =>
          Redirect(routes.TaskList3.load()).withSession(request.session - "username")
        case None =>
          Ok("")
      }
    }
  }



}

app_controllers_WebSocketChat.scala

package controllers

import java.util.concurrent.atomic.AtomicInteger

import actors.ChatManager.LogoutMessage
import actors.{ChatActor, ChatManager, TickActor}
import akka.actor.{ActorSystem, Props}
import akka.http.scaladsl.Http
import akka.http.scaladsl.model.ws.{Message, WebSocketRequest}
import akka.http.scaladsl.settings.ClientConnectionSettings
import akka.stream.Materializer
import akka.stream.scaladsl.{Flow, Sink, Source}
import akka.util.ByteString
import javax.inject.{Inject, Singleton}
import models.{TaskListInMemoryModel, UserData}
import play.api.libs.json.{JsError, JsSuccess, Json, Reads}
import play.api.libs.streams.ActorFlow
import play.api.mvc.{AbstractController, ControllerComponents, WebSocket}
import tasks.KeepAliveTask

import scala.concurrent.duration._

@Singleton
class WebSocketChat @Inject()(cc: ControllerComponents)(implicit system:ActorSystem, mat: Materializer) extends AbstractController(cc) with play.api.i18n.I18nSupport {

  var currentUsername = "";
  import system.dispatcher
  val manager = system.actorOf(Props[ChatManager], "Manager")
  val keepAlive = new KeepAliveTask(system, manager)

  def index(username: String) = Action { implicit request =>
    currentUsername = username
      Ok(views.html.chatPage(username))
  }

  def logoutMessage() = Action { implicit request =>
    manager ! LogoutMessage(currentUsername)
    Redirect(routes.TaskList5.logout())
  }

  def socket() = WebSocket.accept[String,String] { implicit request =>

      ActorFlow.actorRef { out =>
        ChatActor.props(out, manager)
      }
    }

  }

app_filters_ExampleFilter.scala

package filters

import akka.stream.Materializer
import javax.inject._
import play.api.mvc._
import scala.concurrent.{ExecutionContext, Future}

/**
 * This is a simple filter that adds a header to all requests. It's
 * added to the application's list of filters by the
 * [[Filters]] class.
 *
 * @param mat This object is needed to handle streaming of requests
 * and responses.
 * @param exec This class is needed to execute code asynchronously.
 * It is used below by the `map` method.
 */
@Singleton
class ExampleFilter @Inject()(
    implicit override val mat: Materializer,
    exec: ExecutionContext) extends Filter {

  override def apply(nextFilter: RequestHeader => Future[Result])
           (requestHeader: RequestHeader): Future[Result] = {
    // Run the next filter in the chain. This will call other filters
    // and eventually call the action. Take the result and modify it
    // by adding a new header.
    nextFilter(requestHeader).map { result =>
      result.withHeaders("X-ExampleFilter" -> "foo")
    }
  }

}

app_models_CodeGen.scala

package models

object CodeGen extends App {
  slick.codegen.SourceCodeGenerator.run(
    "slick.jdbc.PostgresProfile",
    "org.postgresql.Driver",
    "jdbc:postgresql://",
    "/home/leonid/Programs/SimpleWebChat/app",
    "models", None, None, true, false
  )
}

app_models_Tables.scala

package models
// AUTO-GENERATED Slick data model

import slick.jdbc.{ MySQLProfile => profile }
/** Stand-alone Slick data model for immediate use */
object Tables extends Tables {
  val profile = slick.jdbc.PostgresProfile
}

/** Slick data model trait for extension, choice of backend or usage in the cake pattern. (Make sure to initialize this late.) */
trait Tables {
  val profile: slick.jdbc.JdbcProfile
  import profile.api._
  import slick.model.ForeignKeyAction
  // NOTE: GetResult mappers for plain SQL are only generated for tables where Slick knows how to map the types of all columns.
  import slick.jdbc.{GetResult => GR}

  /** DDL for all tables. Call .create to execute. */
  lazy val schema: profile.SchemaDescription = Items.schema ++ Users.schema
  @deprecated("Use .schema instead of .ddl", "3.0")
  def ddl = schema

  /** Entity class storing rows of table Items
   *  @param itemId Database column item_id SqlType(serial), AutoInc, PrimaryKey
   *  @param userId Database column user_id SqlType(int4)
   *  @param text Database column text SqlType(varchar), Length(2000,true) */
  case class ItemsRow(itemId: Int, userId: Int, text: String)
  /** GetResult implicit for fetching ItemsRow objects using plain SQL queries */
  implicit def GetResultItemsRow(implicit e0: GR[Int], e1: GR[String]): GR[ItemsRow] = GR{
    prs => import prs._
    ItemsRow.tupled((<<[Int], <<[Int], <<[String]))
  }
  /** Table description of table items. Objects of this class serve as prototypes for rows in queries. */
  class Items(_tableTag: Tag) extends profile.api.Table[ItemsRow](_tableTag, "items") {
    def * = (itemId, userId, text) <> (ItemsRow.tupled, ItemsRow.unapply)
    /** Maps whole row to an option. Useful for outer joins. */
    def ? = ((Rep.Some(itemId), Rep.Some(userId), Rep.Some(text))).shaped.<>({r=>import r._; _1.map(_=> ItemsRow.tupled((_1.get, _2.get, _3.get)))}, (_:Any) =>  throw new Exception("Inserting into ? projection not supported."))

    /** Database column item_id SqlType(serial), AutoInc, PrimaryKey */
    val itemId: Rep[Int] = column[Int]("item_id", O.AutoInc, O.PrimaryKey)
    /** Database column user_id SqlType(int4) */
    val userId: Rep[Int] = column[Int]("user_id")
    /** Database column text SqlType(varchar), Length(2000,true) */
    val text: Rep[String] = column[String]("text", O.Length(2000,varying=true))

    /** Foreign key referencing Users (database name items_user_id_fkey) */
    lazy val usersFk = foreignKey("items_user_id_fkey", userId, Users)(r => r.id, onUpdate=ForeignKeyAction.NoAction, onDelete=ForeignKeyAction.Cascade)
  }
  /** Collection-like TableQuery object for table Items */
  lazy val Items = new TableQuery(tag => new Items(tag))

  /** Entity class storing rows of table Users
   *  @param id Database column id SqlType(serial), AutoInc, PrimaryKey
   *  @param username Database column username SqlType(varchar), Length(20,true)
   *  @param password Database column password SqlType(varchar), Length(200,true)
   *  @param online Database column online SqlType(bool) */
  case class UsersRow(id: Int, username: String, password: String, online: Boolean)
  /** GetResult implicit for fetching UsersRow objects using plain SQL queries */
  implicit def GetResultUsersRow(implicit e0: GR[Int], e1: GR[String], e2: GR[Boolean]): GR[UsersRow] = GR{
    prs => import prs._
    UsersRow.tupled((<<[Int], <<[String], <<[String], <<[Boolean]))
  }
  /** Table description of table users. Objects of this class serve as prototypes for rows in queries. */
  class Users(_tableTag: Tag) extends profile.api.Table[UsersRow](_tableTag, "users") {
    def * = (id, username, password, online) <> (UsersRow.tupled, UsersRow.unapply)
    /** Maps whole row to an option. Useful for outer joins. */
    def ? = ((Rep.Some(id), Rep.Some(username), Rep.Some(password), Rep.Some(online))).shaped.<>({r=>import r._; _1.map(_=> UsersRow.tupled((_1.get, _2.get, _3.get, _4.get)))}, (_:Any) =>  throw new Exception("Inserting into ? projection not supported."))

    /** Database column id SqlType(serial), AutoInc, PrimaryKey */
    val id: Rep[Int] = column[Int]("id", O.AutoInc, O.PrimaryKey)
    /** Database column username SqlType(varchar), Length(20,true) */
    val username: Rep[String] = column[String]("username", O.Length(20,varying=true))
    /** Database column password SqlType(varchar), Length(200,true) */
    val password: Rep[String] = column[String]("password", O.Length(200,varying=true))
    /** Database column online SqlType(bool) */
    val online: Rep[Boolean] = column[Boolean]("online")
  }
  /** Collection-like TableQuery object for table Users */
  lazy val Users = new TableQuery(tag => new Users(tag))
}

app_models_TaskItem.scala

package models

case class TaskItem(id:Int, text:String) {

}

app_models_TaskListDatabaseModel.scala

package models

import scala.collection.mutable
import slick.jdbc.PostgresProfile.api._

import scala.concurrent.{ExecutionContext, Future}
import models.Tables._
import org.mindrot.jbcrypt.BCrypt


class TaskListDatabaseModel(db: Database)(implicit ec: ExecutionContext) {

  def validateUser(username: String, password: String, status: Boolean): Future[Option[Int]] = {
    db.run(
      (for {
        user <- Users if user.username === username
      } yield {
        user
      }).map(_.online).update(status))
    val matches = db.run(Users.filter(userRow => userRow.username === username).result)
    matches.map(userRows => userRows.headOption.flatMap {
      userRow => if (BCrypt.checkpw(password, userRow.password)) Some(userRow.id) else None
    })
  }

  def createUser(username: String, password: String, status: Boolean): Future[Option[Int]] = {
    val matches = db.run(Users.filter(userRow => userRow.username === username).result)
    matches.flatMap { userRows =>
      if (userRows.isEmpty) {
        db.run(Users += UsersRow(-1, username, BCrypt.hashpw(password, BCrypt.gensalt()), status))
          .flatMap { addCount =>
            if (addCount > 0) db.run(Users.filter(userRow => userRow.username === username).result)
              .map(_.headOption.map(_.id))
            else Future.successful(None)
          }
      } else Future.successful(None)
    }
  }

  def getTasks(username: String): Future[Seq[TaskItem]] = {
    db.run(
      (for {
        user <- Users if user.username === username
        item <- Items if item.userId === user.id
      } yield {
        // TaskItem(item.itemId, item.text)
        item
      }).result
    ).map(_.map(itemRow => TaskItem(itemRow.itemId, itemRow.text)))
  }

  def addTask(userid: Int, task: String): Future[Int] = {
    db.run(Items += ItemsRow(-1, userid, task))
  }

  def removeTask(itemId: Int): Future[Boolean] = {
    db.run(Items.filter(_.itemId === itemId).delete).map(count => count > 0)
  }

  def logoutUpdateStatus(username: String, status: Boolean): Future[Option[Int]] = {
    db.run(
      (for {
        user <- Users if user.username === username
      } yield {
        user
      }).map(_.online).update(status)
    ).flatMap { addCount =>
      if (addCount > 0) db.run(Users.filter(userRow => userRow.username === username).result)
        .map(_.headOption.map(_.id))
      else Future.successful(None)
    }
  }


}

app_models_TaskListInMemoryModel.scala

package models

import scala.collection.mutable

object TaskListInMemoryModel {
  private val users = mutable.Map[String, String]("Mark" -> "pass")
  private val tasks = mutable.Map[String, List[String]]("Mark" -> List("Make videos", "eat","sleep","code"))

  def validateUser(username: String, password: String): Boolean = {
    users.get(username).map(_ == password).getOrElse(false)
  }

  def createUser(username: String, password: String): Boolean = {
    if (users.contains(username)) false else {
      users(username) = password
      true
    }
  }

  def getTasks(username: String): Seq[String] = {
    tasks.get(username).getOrElse(Nil)
  }

  def addTask(username: String, task: String): Unit = {
    tasks(username) = task :: tasks.get(username).getOrElse(Nil)
  }

  def removeTask(username: String, index: Int): Boolean = {
    if (index < 0 || tasks.get(username).isEmpty || index >= tasks(username).length) false
    else {
      tasks(username) = tasks(username).patch(index, Nil, 1)
      true
    }
  }
}

app_models_UserData.scala

package models

case class UserData(username:String, password:String, status: Boolean) {

}

app_Module.scala

import com.google.inject.AbstractModule
import java.time.Clock

import services.{ApplicationTimer, AtomicCounter, Counter}

/**
 * This class is a Guice module that tells Guice how to bind several
 * different types. This Guice module is created when the Play
 * application starts.

 * Play will automatically use any class called `Module` that is in
 * the root package. You can create modules in other locations by
 * adding `play.modules.enabled` settings to the `application.conf`
 * configuration file.
 */
class Module extends AbstractModule {

  override def configure() = {
    // Use the system clock as the default implementation of Clock
    bind(classOf[Clock]).toInstance(Clock.systemDefaultZone)
    // Ask Guice to create an instance of ApplicationTimer when the
    // application starts.
    bind(classOf[ApplicationTimer]).asEagerSingleton()
    // Set AtomicCounter as the implementation for Counter.
    bind(classOf[Counter]).to(classOf[AtomicCounter])
  }

}

app_services_ApplicationTimer.scala

package services

import java.time.{Clock, Instant}
import javax.inject._
import play.api.Logger
import play.api.inject.ApplicationLifecycle
import scala.concurrent.Future

/**
 * This class demonstrates how to run code when the
 * application starts and stops. It starts a timer when the
 * application starts. When the application stops it prints out how
 * long the application was running for.
 *
 * This class is registered for Guice dependency injection in the
 * [[Module]] class. We want the class to start when the application
 * starts, so it is registered as an "eager singleton". See the code
 * in the [[Module]] class to see how this happens.
 *
 * This class needs to run code when the server stops. It uses the
 * application's [[ApplicationLifecycle]] to register a stop hook.
 */
@Singleton
class ApplicationTimer @Inject() (clock: Clock, appLifecycle: ApplicationLifecycle) {

  private val logger: Logger = Logger(this.getClass)

  // This code is called when the application starts.
  private val start: Instant = clock.instant
  logger.info(s"ApplicationTimer demo: Starting application at $start.")

  // When the application starts, register a stop hook with the
  // ApplicationLifecycle object. The code inside the stop hook will
  // be run when the application stops.
  appLifecycle.addStopHook { () =>
    val stop: Instant = clock.instant
    val runningTime: Long = stop.getEpochSecond - start.getEpochSecond
    logger.info(s"ApplicationTimer demo: Stopping application at ${clock.instant} after ${runningTime}s.")
    Future.successful(())
  }
}

app_services_Counter.scala

package services

import java.util.concurrent.atomic.AtomicInteger
import javax.inject._

/**
 * This trait demonstrates how to create a component that is injected
 * into a controller. The trait represents a counter that returns a
 * incremented number each time it is called.
 */
trait Counter {
  def nextCount(): Int
}

/**
 * This class is a concrete implementation of the [[Counter]] trait.
 * It is configured for Guice dependency injection in the [[Module]]
 * class.
 *
 * This class has a `Singleton` annotation because we need to make
 * sure we only use one counter per application. Without this
 * annotation we would get a new instance every time a [[Counter]] is
 * injected.
 */
@Singleton
class AtomicCounter extends Counter {  
  private val atomicCounter = new AtomicInteger()
  override def nextCount(): Int = atomicCounter.getAndIncrement()
}

app_tasks_KeepAliveTask.scala

package tasks

import akka.actor.{ActorRef, ActorSystem}
import javax.inject.{Inject, Named}

import scala.concurrent.ExecutionContext
import scala.concurrent.duration._

class KeepAliveTask @Inject() (actorSystem: ActorSystem, @Named("some-actor") someActor: ActorRef)(
  implicit executionContext: ExecutionContext
) {
  actorSystem.scheduler.scheduleAtFixedRate(
    initialDelay = 0.microseconds,
    interval = 5.seconds,
    receiver = someActor,
    message = "tick009"
  )
}

app_views_chatPage.scala.html

@(v:String)(implicit requestHeader: RequestHeader, flash: Flash)

@main("WebSocket Chat") {

<!DOCTYPE html>
    <html lang="en">
        <head>
            <title>Login Activity Control API</title>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1">
                <!--===============================================================================================-->
            <link rel="icon" type="@routes.Assets.versioned("login_v1/image/png")" href="@routes.Assets.versioned("login_v1/images/icons/favicon.ico")"/>
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/vendor/bootstrap/css/bootstrap.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/fonts/font-awesome-4.7.0/css/font-awesome.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/fonts/Linearicons-Free-v1.0.0/icon-font.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/vendor/animate/animate.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/vendor/css-hamburgers/hamburgers.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/vendor/select2/select2.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/css/util.css")">
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/css/main.css")">
                <!--===============================================================================================-->
                <!--===============================================================================================-->

        </head>
        <body>
            <input type="hidden" id="csrfToken" value="@helper.CSRF.getToken.value">
            <input type="hidden" id="validateRoute" value="@routes.TaskList3.validate()">
            <input type="hidden" id="tasksRoute" value="@routes.TaskList3.taskList()">
            <input type="hidden" id="createRoute" value="@routes.TaskList3.createUser()">
            <input type="hidden" id="deleteRoute" value="@routes.TaskList3.delete()">
            <input type="hidden" id="addRoute" value="@routes.TaskList3.addTask()">
            <input type="hidden" id="ws-route" value="@routes.WebSocketChat.socket.absoluteURL()">
            <input type="hidden" id="chat-route" value="@routes.WebSocketChat.index(v)">
            <input type="hidden" id="username" value=@v>

            <div class="limiter">
                    <div class="container-login100" style="background-image: url('images/img-01.jpg');">
                        <div class="wrap-login100 p-t-130 p-b-30">
                            @*                        <form class="login100-form validate-form">*@
                            <div class="login100-form-avatar">
                                <img src="@routes.Assets.versioned("login_v1/images/icons/fire.png")" alt="AVATAR">
                            </div>

                            <span class="login100-form-title p-t-20 p-b-45">
                               Simple Chat
                            </span>

                            <div class="wrap-input100 validate-input m-b-10">
                                <textarea id="chat-area" class="input101" rows="15" cols="200"></textarea>
                                <span class="focus-input100"></span>
                                <span class="symbol-input100">
                                </span>
                            </div>

                            <div class="wrap-input100 validate-input m-b-10" data-validate = "Username is required">
                                <input id="chat-input" class="input100" size="150" type="text" placeholder="Text">
                                <span class="focus-input100"></span>
                                <span class="symbol-input100">
                                </span>
                            </div>

                            <div class="container-login100-form-btn p-t-10">
                                <button id="sendButton" onclick="login()" class="login100-form-btn">
                                    Send
                                </button>
                            </div>
                            <div class="text-center w-full p-t-25 p-b-230">
                                <div class="text-center w-full">
                                    <a href="@routes.WebSocketChat.logoutMessage()">Logout</a>
                                </div>
                            </div>

                        </div>
                    </div>
                </div>


                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("login_v1/vendor/jquery/jquery-3.2.1.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("login_v1/vendor/bootstrap/js/popper.js")"></script>
            <script src="@routes.Assets.versioned("login_v1/vendor/bootstrap/js/bootstrap.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("login_v1/vendor/select2/select2.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("login_v1/js/main.js")"></script>

            <script src="@routes.Assets.versioned("javascripts/version3.js")"></script>

            <script src="@routes.Assets.versioned("javascripts/chat.js")"></script>

        </body>
    </html>



}

app_views_index.scala.html

@*
 * This template takes a single argument, a String containing a
 * message to display.
 *@
@(message: String)

@*
 * Call the `main` template with two arguments. The first
 * argument is a `String` with the title of the page, the second
 * argument is an `Html` object containing the body of the page.
 *@
@main("Welcome to Play") {

    @*
     * Get an `Html` object by calling the built-in Play welcome
     * template and passing a `String` message.
     *@
    @welcome(message, style = "scala")

}

app_views_main.scala.html

@*
 * This template is called from the `index` template. This template
 * handles the rendering of the page header and body tags. It takes
 * two arguments, a `String` for the title of the page and an `Html`
 * object to insert into the body of the page.
 *@
@(title: String)(content: Html)

<!DOCTYPE html>
<html lang="en">
    <head>
        @* Here's where we render the page title `String`. *@
        <title>@title</title>
        <link rel="stylesheet" media="screen" href="@routes.Assets.versioned("stylesheets/main.css")">
        <link rel="shortcut icon" type="image/png" href="@routes.Assets.versioned("images/favicon.png")">
        <script src="@routes.Assets.versioned("javascripts/hello.js")" type="text/javascript"></script>
    </head>
    <body>
        @* And here's where we render the `Html` object containing
         * the page content. *@
        @content
    </body>
</html>

app_views_version4Main.scala.html

@()(implicit request: RequestHeader, flash: Flash)

@main("Task List (Version 3)") {
    <div id="contents"></div>

@*    ------------------------------------*@
    <!DOCTYPE html>
    <html lang="en">
        <head>
            <title>Login Activity Control API</title>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1">
                <!--===============================================================================================-->
            <link rel="icon" type="@routes.Assets.versioned("login_v1/image/png")" href="@routes.Assets.versioned("login_v1/images/icons/favicon.ico")"/>
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/vendor/bootstrap/css/bootstrap.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/fonts/font-awesome-4.7.0/css/font-awesome.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/fonts/Linearicons-Free-v1.0.0/icon-font.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/vendor/animate/animate.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/vendor/css-hamburgers/hamburgers.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/vendor/select2/select2.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/css/util.css")">
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("login_v1/css/main.css")">
                <!--===============================================================================================-->
        </head>
        <body>
            <input type="hidden" id="csrfToken" value="@helper.CSRF.getToken.value">
            <input type="hidden" id="validateRoute" value="@routes.TaskList5.validate()">
            <input type="hidden" id="tasksRoute" value="@routes.TaskList5.taskList()">
            <input type="hidden" id="createRoute" value="@routes.TaskList5.createUser()">
            <input type="hidden" id="deleteRoute" value="@routes.TaskList5.delete()">
            <input type="hidden" id="addRoute" value="@routes.TaskList5.addTask()">


            <div id="register-section" hidden>
                <div class="limiter">
                    <div class="container-login100" style="background-image: url('images/img-01.jpg');">
                        <div class="wrap-login100 p-t-130 p-b-30">
                            @*                        <form class="login100-form validate-form">*@
                            <div class="login100-form-avatar">
                                <img src="@routes.Assets.versioned("login_v1/images/icons/fire.png")" alt="AVATAR">
                            </div>

                            <span class="login100-form-title p-t-20 p-b-45">
                                Register on Simple Chat
                            </span>

                            <div class="wrap-input100 validate-input m-b-10" data-validate = "Email is required">
                                <input id="email" class="input100" type="text" placeholder="Email">
                                <span class="focus-input100"></span>
                                <span class="symbol-input100">
                                    <i class="fa fa-envelope-o"></i>
                                </span>
                            </div>

                            <div class="wrap-input100 validate-input m-b-10" data-validate = "Username is required">
                                <input id="createName" class="input100" type="text" placeholder="Username">
                                <span class="focus-input100"></span>
                                <span class="symbol-input100">
                                    <i class="fa fa-user"></i>
                                </span>
                            </div>

                            <div class="wrap-input100 validate-input m-b-10" data-validate = "Password is required">
                                <input id="createPass" class="input100" type="password" placeholder="Password">
                                <span class="focus-input100"></span>
                                <span class="symbol-input100">
                                    <i class="fa fa-lock"></i>
                                </span>
                            </div>

                            <div class="container-login100-form-btn p-t-10">
                                <button onclick="createUser()" class="login100-form-btn">
                                    Register
                                </button>
                            </div>

                            <div class="text-center w-full p-t-25 p-b-100">
                                <a href="#" class="txt1">
                                </a>
                            </div>
                            <br>
                            <div class="text-center w-full">
                                <a href="#" class="txt1" onclick="visibleLogin()">
                                    Go to login page
                                </a>
                            </div>

                            @*                        </form>*@
                        </div>
                    </div>
                </div>
            </div>

            <div id="login-section">
            <div class="limiter">
                <div class="container-login100" style="background-image: url('images/img-01.jpg');">
                    <div class="wrap-login100 p-t-190 p-b-30">
@*                        <form class="login100-form validate-form">*@
                            <div class="login100-form-avatar">
                                <img src="@routes.Assets.versioned("login_v1/images/icons/fire.png")" alt="AVATAR">
                            </div>

                            <span class="login100-form-title p-t-20 p-b-45">
                                Welcome to Simple Chat
                            </span>

                            <div class="wrap-input100 validate-input m-b-10" data-validate = "Username is required">
                                <input id="loginName" class="input100" type="text" placeholder="Username">
                                <span class="focus-input100"></span>
                                <span class="symbol-input100">
                                    <i class="fa fa-user"></i>
                                </span>
                            </div>

                            <div class="wrap-input100 validate-input m-b-10" data-validate = "Password is required">
                                <input id="loginPass" class="input100" type="password" placeholder="Password">
                                <span class="focus-input100"></span>
                                <span class="symbol-input100">
                                    <i class="fa fa-lock"></i>
                                </span>
                            </div>

                            <div class="container-login100-form-btn p-t-10">
                                <button onclick="login()" class="login100-form-btn">
                                   Login
                                </button>
                            </div>

                            <div class="text-center w-full p-t-25 p-b-50">
                                <a href="#" class="txt1">
                                    Forgot Username / Password?
                                </a>
                            </div>

                            <div class="text-center w-full">
                                <a href="#" class="txt1" onclick="visibleCreateUser()">
                                    Create new account
                                </a>
                            </div>
@*                        </form>*@
                    </div>
                </div>
            </div>
            </div>

                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("login_v1/vendor/jquery/jquery-3.2.1.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("login_v1/vendor/bootstrap/js/popper.js")"></script>
            <script src="@routes.Assets.versioned("login_v1/vendor/bootstrap/js/bootstrap.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("login_v1/vendor/select2/select2.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("login_v1/js/main.js")"></script>

            <script src="@routes.Assets.versioned("javascripts/version3.js")"></script>



        </body>
    </html>
@*    ------------------------------------*@

    </div>





}

app_views_version5Main.scala.html

@()(implicit request: RequestHeader, flash: Flash)

@main("Task List (Version 4)") {
    <div id="contents"></div>

@*    ------------------------------------*@
    <!DOCTYPE html>
    <html lang="en">
        <head>
            <title>Login Activity Control API</title>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1">
                <!--===============================================================================================-->
            <link rel="icon" type="@routes.Assets.versioned("version1/login_v1/image/png")" href="@routes.Assets.versioned("version1/login_v1/images/icons/favicon.ico")"/>
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/vendor/bootstrap/css/bootstrap.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/fonts/font-awesome-4.7.0/css/font-awesome.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/fonts/Linearicons-Free-v1.0.0/icon-font.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/vendor/animate/animate.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/vendor/css-hamburgers/hamburgers.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/vendor/select2/select2.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/css/util.css")">
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/css/main.css")">
                <!--===============================================================================================-->
        </head>
        <body>

                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("version1/login_v1/vendor/jquery/jquery-3.2.1.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("version1/login_v1/vendor/bootstrap/js/popper.js")"></script>
            <script src="@routes.Assets.versioned("version1/login_v1/vendor/bootstrap/js/bootstrap.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("version1/login_v1/vendor/select2/select2.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("version1/login_v1/js/main.js")"></script>

            <script src="https://unpkg.com/react@@16/umd/react.development.js"></script>
            <script src="https://unpkg.com/react-dom@@16/umd/react-dom.development.js"></script>

        </body>
    </html>
@*    ------------------------------------*@

    <input type="hidden" id="csrfToken" value="@helper.CSRF.getToken.value">
    <input type="hidden" id="validateRoute" value="@routes.TaskList3.validate()">
    <input type="hidden" id="tasksRoute" value="@routes.TaskList3.taskList()">
    <input type="hidden" id="createRoute" value="@routes.TaskList3.createUser()">
    <input type="hidden" id="deleteRoute" value="@routes.TaskList3.delete()">
    <input type="hidden" id="addRoute" value="@routes.TaskList3.addTask()">

    <div id="react-root"></div>
    <script src="@routes.Assets.versioned("javascripts/version4.js")"></script>



}

app_views_version6Main.scala.html

@()(implicit request: RequestHeader, flash: Flash)

@main("Task List (Version 4)") {
    <div id="contents"></div>

@*    ------------------------------------*@
    <!DOCTYPE html>
    <html lang="en">
        <head>
            <title>Login Activity Control API</title>
            <meta charset="UTF-8">
            <meta name="viewport" content="width=device-width, initial-scale=1">
                <!--===============================================================================================-->
            <link rel="icon" type="@routes.Assets.versioned("version1/login_v1/image/png")" href="@routes.Assets.versioned("version1/login_v1/images/icons/favicon.ico")"/>
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/vendor/bootstrap/css/bootstrap.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/fonts/font-awesome-4.7.0/css/font-awesome.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/fonts/Linearicons-Free-v1.0.0/icon-font.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/vendor/animate/animate.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/vendor/css-hamburgers/hamburgers.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/vendor/select2/select2.min.css")">
                <!--===============================================================================================-->
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/css/util.css")">
            <link rel="stylesheet" type="text/css" href="@routes.Assets.versioned("version1/login_v1/css/main.css")">
                <!--===============================================================================================-->
        </head>
        <body>

                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("version1/login_v1/vendor/jquery/jquery-3.2.1.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("version1/login_v1/vendor/bootstrap/js/popper.js")"></script>
            <script src="@routes.Assets.versioned("version1/login_v1/vendor/bootstrap/js/bootstrap.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("version1/login_v1/vendor/select2/select2.min.js")"></script>
                <!--===============================================================================================-->
            <script src="@routes.Assets.versioned("version1/login_v1/js/main.js")"></script>

            <script src="https://unpkg.com/react@@16/umd/react.development.js"></script>
            <script src="https://unpkg.com/react-dom@@16/umd/react-dom.development.js"></script>

        </body>
    </html>
@*    ------------------------------------*@

    <input type="hidden" id="csrfToken" value="@helper.CSRF.getToken.value">
    <input type="hidden" id="validateRoute" value="@routes.TaskList5.validate()">
    <input type="hidden" id="tasksRoute" value="@routes.TaskList5.taskList()">
    <input type="hidden" id="createRoute" value="@routes.TaskList5.createUser()">
    <input type="hidden" id="deleteRoute" value="@routes.TaskList5.delete()">
    <input type="hidden" id="addRoute" value="@routes.TaskList5.addTask()">
    <input type="hidden" id="logoutRoute" value="@routes.TaskList5.logout()">

    <div id="react-root"></div>
    <script src="@routes.Assets.versioned("javascripts/version5.js")"></script>



}

app_views_welcome.scala.html

@(message: String, style: String = "scala") 

@defining(play.core.PlayVersion.current) { version =>

<section id="top">
  <div class="wrapper">
    <h1><a href="https://playframework.com/documentation/@version/Home">@message</a></h1>
  </div>
</section>

<div id="content" class="wrapper doc">
<article>

  <h1>Welcome to Play</h1>

  <p>
    Congratulations, you’ve just created a new Play application. This page will help you with the next few steps.
  </p>

  <blockquote>
    <p>
      You’re using Play @version
    </p>
  </blockquote>

  <h2>Why do you see this page?</h2>

    <p>
      The <code>conf/routes</code> file defines a route that tells Play to invoke the <code>HomeController.index</code> action
      whenever a browser requests the <code>/</code> URI using the GET method:
    </p>

    <pre><code># Home page
GET     /               controllers.HomeController.index</code></pre>

    <p>
      Play has invoked the <code>controllers.HomeController.index</code> method to obtain the <code>Action</code> to execute:
    </p>

    <pre><code>def index = Action { implicit request: Request[AnyContent] =>
  Ok(views.html.index("Your new application is ready!"))
}</code></pre>

    <p>
      An action is a function that handles the incoming HTTP request, and returns the HTTP result to send back to the web client.
      Here we send a <code>200 OK</code> response, using a template to fill its content.
    </p>

    <p>
      The template is defined in the <code>app/views/index.scala.html</code> file and compiled as a Scala function.
    </p>

    <pre><code>@@(message: String)

@@main("Welcome to Play") {

    @@welcome(message)

}</code></pre>

    <p>
      The first line of the template defines the function signature. Here it just takes a single <code>String</code> parameter.
      This template then calls another function defined in <code>app/views/main.scala.html</code>, which displays the HTML
      layout, and another function that displays this welcome message. You can freely add any HTML fragment mixed with Scala
      code in this file.
    </p>

    <p>You can read more about <a href="https://www.playframework.com/documentation/@version/ScalaTemplates">Twirl</a>, the template language used by Play, and how Play handles <a href="https://www.playframework.com/documentation/@version/ScalaActions">actions</a>.</p>

    <h2>Async Controller</h2>

    Now that you've seen how Play renders a page, take a look at <code>AsyncController.scala</code>, which shows how to do asynchronous programming when handling a request.  The code is almost exactly the same as <code>HomeController.scala</code>, but instead of returning <code>Result</code>, the action returns <code>Future[Result]</code> to Play.  When the execution completes, Play can use a thread to render the result without blocking the thread in the mean time.

    <p>
        <a href="@routes.AsyncController.message">Click here for the AsyncController action!</a>
    </p>

    <p>
        You can read more about <a href="https://www.playframework.com/documentation/@version/ScalaAsync">asynchronous actions</a> in the documentation.
    </p>

    <h2>Count Controller</h2>

    <p>
        Both the HomeController and AsyncController are very simple, and typically controllers present the results of the interaction of several services.  As an example, see the <code>CountController</code>, which shows how to inject a component into a controller and use the component when handling requests.  The count controller increments every time you click on it, so keep clicking to see the numbers go up.
    </p>

    <p>
        <a href="@routes.CountController.count">Click here for the CountController action!</a>
    </p>

    <p>
        You can read more about <a href="https://www.playframework.com/documentation/@version/ScalaDependencyInjection">dependency injection</a> in the documentation.
    </p>

    <h2>Need more info on the console?</h2>

  <p>
    For more information on the various commands you can run on Play, i.e. running tests and packaging applications for production, see <a href="https://playframework.com/documentation/@version/PlayConsole">Using the Play console</a>.
  </p>  

  <h2>Need to set up an IDE?</h2>

  <p>
      You can start hacking your application right now using any text editor. Any changes will be automatically reloaded at each page refresh, 
      including modifications made to Scala source files.
  </p>

  <p>
      If you want to set-up your application in <strong>IntelliJ IDEA</strong> or any other Java IDE, check the 
      <a href="https://www.playframework.com/documentation/@version/IDE">Setting up your preferred IDE</a> page.
  </p>

  <h2>Need more documentation?</h2>

  <p>
    Play documentation is available at <a href="https://www.playframework.com/documentation/@version">https://www.playframework.com/documentation</a>.
  </p>

  <p>
    Play comes with lots of example templates showcasing various bits of Play functionality at <a href="https://www.playframework.com/download#examples">https://www.playframework.com/download#examples</a>.
  </p>

  <h2>Need more help?</h2>

  <p>
    Play questions are asked and answered on Stackoverflow using the "playframework" tag: <a href="https://stackoverflow.com/questions/tagged/playframework">https://stackoverflow.com/questions/tagged/playframework</a>
  </p>

  <p>
    The <a href="https://groups.google.com/group/play-framework">Play Google Group</a> is where Play users come to seek help,
    announce projects, and discuss issues and new features. If you don’t have a Google account, you can still join the mailing
    list by sending an e-mail to
    <strong>play-framework+subscribe@@googlegroups.com</strong>.
  </p>

  <p>
    Gitter is a real time chat channel, like IRC. The <a href="https://gitter.im/playframework/playframework">playframework/playframework</a>  channel is used by Play users to discuss the ins and outs of writing great Play applications.
  </p>
 
</article>

<aside>
  <h3>Browse</h3>
  <ul>
    <li><a href="https://playframework.com/documentation/@version">Documentation</a></li>
    <li><a href="https://playframework.com/documentation/@version/api/@style/index.html">Browse the @{style.capitalize} API</a></li>
  </ul>
  <h3>Start here</h3>
  <ul>
    <li><a href="https://playframework.com/documentation/@version/PlayConsole">Using the Play console</a></li>
    <li><a href="https://playframework.com/documentation/@version/IDE">Setting up your preferred IDE</a></li>
    <li><a href="https://playframework.com/download#examples">Example Projects</a>
  </ul>
  <h3>Help here</h3>
  <ul>
    <li><a href="https://stackoverflow.com/questions/tagged/playframework">Stack Overflow</a></li>
    <li><a href="https://groups.google.com/group/play-framework">Mailing List</a></li>
    <li><a href="https://gitter.im/playframework/playframework">Gitter Channel</a></li>
  </ul>
  
</aside>

</div>
}