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Lift Framework example source code file (LRU.scala)

This example Lift Framework source code file (LRU.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

box, empty, empty, int, int, lru, lru, valuetype, valuetype

The Lift Framework LRU.scala source code

 * Copyright 2006-2011 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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package net.liftweb 
package util 

import common._

 * LRU Cache wrapping {@link org.apache.commons.collections.map.LRUMap}
 * @param size the maximum number of Elements allowed in the LRU map
 * @param loadFactor the Load Factor to construct our LRU with.
class LRU[KeyType, ValueType](size: Int, loadFactor: Box[Float]) extends net.liftweb.common.LRUMap[KeyType, ValueType](size, loadFactor) {
  // Alternate constructor that gives you no load factor.
  def this(size: Int) = this(size, Empty)


  private val map = loadFactor match {
    case Full(lf) => new LRUMap(size, lf)
    case _ => new LRUMap(size)

  def update(k: KeyType, v: ValueType) {
    map.put(k, v)

  def remove(k: KeyType) = map.remove(k)

  def get(k: KeyType): Box[ValueType] =
  if (map.containsKey(k)) Full(this.apply(k))
  else Empty

  def apply(k: KeyType): ValueType = map.get(k).asInstanceOf[ValueType]
  def contains(k: KeyType): Boolean = map.containsKey(k)
  def keys: List[KeyType] = map.keySet().toList.map(_.asInstanceOf[KeyType])

Other Lift Framework examples (source code examples)

Here is a short list of links related to this Lift Framework LRU.scala source code file:

my book on functional programming


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