Lift Framework example source code file (LruMapSpec.scala)

This example Lift Framework source code file (LruMapSpec.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Lift Framework tags/keywords

an, empty, int, int, lru, lrumap, lrumap, lrumapspec, map, map, maxsize, n, n, specification

The Lift Framework LruMapSpec.scala source code

/*
 * Copyright 2010-2011 WorldWide Conferencing, LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.liftweb
package common

import org.specs.Specification


/**
 * Systems under specification for LRU Map.
 */
object LruMapSpec extends Specification("LRU Map Specification") {

  "An LRU Map" should {

    "never grow beyond the given size" in {
      val lru = new LRUMap[Int, Int](10)
      for (i <- 1 to 20) lru(i) = i

      lru.size must_== 10
    }

    "have the last N elements (where N is the initial MaxSize)" in {
      val lru = new LRUMap[Int, Int](10)
      for (i <- 1 to 20) lru(i) = i

      lru.size must_== 10
      for (i <- 11 to 20) lru(i) must_== i
    }

    "expire elements to func" in {
      var expCnt = 0
      val lru = new LRUMap[Int, Int](10, Empty, (k, v) => {expCnt += 1; k must_== v; k must be > 0; v must be < 11})
      for (i <- 1 to 20) lru(i) = i

      lru.size must_== 10
      expCnt must_== 10
      for (i <- 11 to 20) lru(i) must_== i
    }

    "not expire the recently accessed elements" in {
      var expCnt = 0
      val lru = new LRUMap[Int, Int](10, Empty, (k, v) => {expCnt += 1; k must_== v; k must be > 0})
      for (i <- 1 to 20) {
        for (q <- 1 to 10) lru.get(q)
        lru(i) = i
      }

      lru.size must_== 10
      for (i <- 2 to 10) lru(i) must_== i
      lru(20) must_== 20
    }

  }

}