How to cache results in scala?

Question

This page has a description of Map\'s getOrElseUpdate usage method:

object WithCache{
  val cacheFun1 = collection.mutable.Map[Int, Int]()
  def         


        

Answer 1

Take a look at spray caching (super simple to use)

http://spray.io/documentation/1.1-SNAPSHOT/spray-caching/

makes the job easy and has some nice features

for example :

      import spray.caching.{LruCache, Cache}

      //this is using Play for a controller example getting something from a user and caching it
      object CacheExampleWithPlay extends Controller{

        //this will actually create a ExpiringLruCache and hold data for 48 hours
        val myCache: Cache[String] = LruCache(timeToLive = new FiniteDuration(48, HOURS))

        def putSomeThingInTheCache(@PathParam("getSomeThing") someThing: String) = Action {
          //put received data from the user in the cache
          myCache(someThing, () => future(someThing))
          Ok(someThing)
        }

        def checkIfSomeThingInTheCache(@PathParam("checkSomeThing") someThing: String) = Action {
          if (myCache.get(someThing).isDefined)
            Ok(s"just $someThing found this in the cache")
          else
            NotFound(s"$someThing NOT found this in the cache")
        }
      }