Simple examples of using ScalaCache in a webapp, using Memcached for caching

ScalaCacheMemcachedSample.scala

package sample

import scalacache._
import memoization._
import memcached._

import scala.concurrent.duration._
import scala.language.postfixOps

case class User(id: Int, name: String)

trait DB {
  def findUserById(id: Int): Option[User]
}

/*
 * Example of using ScalaCache to cache a DB lookup
 */
class UserRepository(db: DB)(implicit val scalaCache: ScalaCache) {

  def find(userId: Int): Option[User] = memoize(30 minutes) {
    db.findUserById(userId)
  }

}

/*
 * Example of using ScalaCache to cache a rendered view
 */
class Controller(implicit val scalaCache: ScalaCache) {

  // Index page will be cached for 60 seconds
  def index = {
    withCaching("/index", Some(60 seconds)) {
      // Lookup a bunch of stuff in DBs and external APIs...

      // Render the view...
      render("index.ssp")
    }
  }

  private def render(template: String): String = ???
}

object MyApp {

  implicit val scalaCache = ScalaCache(MemcachedCache("cacheserver:11211"))

  val db = new DB {
    def findUserById(id: Int) = ??? // do DB lookup
  }

  val userRepo = new UserRepository(db)
  val userController = new Controller

}