arnold1 / address_cache

#Overview

This project implements a addresscache interface for a fictional InetAddress cache. The cache has a "Last-In-First-Out" (LIFO) retrieval policy and a "First-In-First-Out" (FIFO) eviction policy. Methods such as peek(), remove() and take() retrieve the most recently added element and an internal cleanup task that in periodic intervals removes the oldest elements from the cache.

#Instructions

• The goal is to write the most beautiful and functionally correct code possible
• This repo includes an Implementation for AddressCache
• A cleanup task runs every 5 seconds to evict expired address's
• The caching time of an element is configurable by the user
• The implementation includes a set of tests to check the correctness
• The cache is designed for optimal asymptotic performance

#Implementation

• The cache is designed with a HashMap and LinkedList
• I implemented my own LinkedList because a ListIterator/Iterator in Java's LinkedList gets invalidated if a new element is added or deleted from the LinkedList
• The cache entries are stored in the first LinkedList which are sorted by least recently use
• The cache entries are stored in the second LinkedList which are sorted by expiration time
• The User can specify the size and and the caching time
• Each cache entry get a timestamp when added into the cache
• A timer runs every second and deletes expired cache entries from the cache
• To compile the code and run the test use Maven:
  • $ mvn compile
  • $ mvn test