cache.scala

package org.aminer.io.utils

import scala.util.Try

import com.google.common.cache.CacheBuilder
import com.google.common.cache.CacheLoader
import com.google.common.cache.LoadingCache

//import com.google.common.cache.CacheBuilder
//import com.google.common.cache.CacheLoader
//import com.google.common.cache.LoadingCache

//Faking this for purposes of code sample...
trait KeyedEntity[K]

trait CachedEntity[E <: KeyedEntity[K], K] {

  def lookup(id: K): E

  def getElem(id: K): Option[E] = Try(elemCache.get(id)).toOption

  val elemCache = CacheBuilder.newBuilder()
    .build(
      new CacheLoader[K, E] {
        def load(key: K) = {
          println("Looking Up key:" + key + "in Class:" + this.getClass.getName)
          lookup(key)
        }
      }).asInstanceOf[LoadingCache[K, E]]
}

//trait LongKeyed[E<: KeyedEntity[Long]] extends CachedEntity[E,Long]
//
//case class MyEntity(id:Long, value:String) extends KeyedEntity[Long]
//
//class MyEntityCache extends LongKeyed[MyEntity]{
//  def lookup(id:Long) = MyEntity(id, "foo") 
//}

object BasicCache {
  //  def main(args: Array[String]) {
  //    val cache = new MyEntityCache
  //    val entity = cache.getElem(1)
  //    println(entity)
  //  }
}