LRU Cache Implementation

Here given code implementation process.

import java.util.ArrayList;
/*
    Java Program for
    LRU Cache Implementation
*/
public class LRU
{
    public ArrayList < Integer > record;
    public int size;
    public int pageHit;
    public int pageFaults;
    public LRU(int size)
    {
        this.size = size;
        this.pageFaults = 0;
        this.pageHit = 0;
        this.record = new ArrayList < Integer > ();
    }
    public void refer(int page)
    {
        if (this.record.contains(page) == false)
        {
            this.pageFaults++;
        }
        if (this.record.contains(page))
        {
            this.pageHit++;
            // When given page alredy exist
            // So we need to remove it
            this.record.remove(new Integer(page));
        }
        else if (this.record.size() == this.size)
        {
            // In case record size is full so remove first element
            this.record.remove(0);
        }
        // Add new node at the last
        this.record.add(page);
    }
    public static void main(String[] args)
    {
        LRU cache = new LRU(4);
        // Page value
        int[] page = {
            6 , 2 , 4 , 2 , 1 , 3 , 2 , 5 , 1 , 3
        };
        // Get number of elements
        int n = page.length;
        for (int i = 0; i < n; ++i)
        {
            cache.refer(page[i]);
        }
        System.out.print("\n Cache Value : ");
        // Display cache value
        for (int i = 0; i < cache.record.size(); ++i)
        {
            System.out.print("  " + cache.record.get(i));
        }
        System.out.print("\n Page Hit : " + cache.pageHit);
        System.out.println("\n Page Faults : " + cache.pageFaults);
    }
}

Output

 Cache Value :   2  5  1  3
 Page Hit : 4
 Page Faults : 6
// Include header file
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
/*
    C++ Program for
    LRU Cache Implementation
*/
class LRU
{
    public: 
    vector < int > record;
    int size;
    int pageHit;
    int pageFaults;
    LRU(int size)
    {
        this->size = size;
        this->pageFaults = 0;
        this->pageHit = 0;
    }
    void refer(int page)
    {
        if (find(this->record.begin(), this->record.end(), page) == 
            this->record.end())
        {
            this->pageFaults++;
        }
        if (find(this->record.begin(), 
                 this->record.end(), page) != this->record.end())
        {
            this->pageHit++;
            // When given page alredy exist
            // So we need to remove it
            this->record.erase(
              remove(this->record.begin(), 
                     this->record.end(), page), 
              this->record.end());
        }
        else if (this->record.size() == this->size)
        {
            // In case record size is full so remove first element
            this->record.erase(this->record.begin() + 0 - 1);
        }
        // Add new node at the last
        this->record.push_back(page);
    }
};
int main()
{
    LRU *cache = new LRU(4);
    // Page value
    int page[] = {
        6 , 2 , 4 , 2 , 1 , 3 , 2 , 5 , 1 , 3
    };
    // Get number of elements
    int n = sizeof(page) / sizeof(page[0]);
    for (int i = 0; i < n; ++i)
    {
        cache->refer(page[i]);
    }
    cout << "\n Cache Value : ";
    // Display cache value
    for (int i = 0; i < cache->record.size(); ++i)
    {
        cout << "  " << cache->record.at(i);
    }
    cout << "\n Page Hit : " << cache->pageHit;
    cout << "\n Page Faults : " << cache->pageFaults << endl;
    return 0;
}

Output

 Cache Value :   2  5  1  3
 Page Hit : 4
 Page Faults : 6
// Include namespace system
using System;
using System.Collections.Generic;
/*
    Csharp Program for
    LRU Cache Implementation
*/
public class LRU
{
    public List < int > record;
    public int size;
    public int pageHit;
    public int pageFaults;
    public LRU(int size)
    {
        this.size = size;
        this.pageFaults = 0;
        this.pageHit = 0;
        this.record = new List < int > ();
    }
    public void refer(int page)
    {
        if (this.record.Contains(page) == false)
        {
            this.pageFaults++;
        }
        if (this.record.Contains(page))
        {
            this.pageHit++;
            // When given page alredy exist
            // So we need to remove it
            this.record.Remove(page);
        }
        else if (this.record.Count == this.size)
        {
            // In case record size is full so remove first element
            this.record.RemoveAt(0);
        }
        // Add new node at the last
        this.record.Add(page);
    }
    public static void Main(String[] args)
    {
        LRU cache = new LRU(4);
        // Page value
        int[] page = {
            6 , 2 , 4 , 2 , 1 , 3 , 2 , 5 , 1 , 3
        };
        // Get number of elements
        int n = page.Length;
        for (int i = 0; i < n; ++i)
        {
            cache.refer(page[i]);
        }
        Console.Write("\n Cache Value : ");
        // Display cache value
        for (int i = 0; i < cache.record.Count; ++i)
        {
            Console.Write("  " + cache.record[i]);
        }
        Console.Write("\n Page Hit : " + cache.pageHit);
        Console.WriteLine("\n Page Faults : " + cache.pageFaults);
    }
}

Output

 Cache Value :   2  5  1  3
 Page Hit : 4
 Page Faults : 6
<?php
/*
    Php Program for
    LRU Cache Implementation
*/
class LRU
{
    public $record;
    public $size;
    public $pageHit;
    public $pageFaults;
    public function __construct($size)
    {
        $this->size = $size;
        $this->pageFaults = 0;
        $this->pageHit = 0;
        $this->record = array();
    }
    public function refer($page)
    {
        if (!in_array($page, $this->record))
        {
            $this->pageFaults++;
        }
        if (in_array($page, $this->record))
        {
            $this->pageHit++;
            // When given page alredy exist
            // So we need to remove it
            if (($key = array_search($page, $this->record)) !== false)
            {
                array_splice($this->record, $key, 1);
            }
        }
        else if (count($this->record) == $this->size)
        {
            // In case record size is full so remove first element
            array_splice($this->record, 0, 1);
        }
        // Add new node at the last
        $this->record[] = $page;
    }
}

function main()
{
    $cache = new LRU(4);
    // Page value
    $page = array(6, 2, 4, 2, 1, 3, 2, 5, 1, 3);
    // Get number of elements
    $n = count($page);
    for ($i = 0; $i < $n; ++$i)
    {
        $cache->refer($page[$i]);
    }
    echo("\n Cache Value : ");
    // Display cache value
    for ($i = 0; $i < count($cache->record); ++$i)
    {
        echo("  ".$cache->record[$i]);
    }
    echo("\n Page Hit : ".$cache->pageHit);
    echo("\n Page Faults : ".$cache->pageFaults.
        "\n");
}
main();

Output

 Cache Value :   2  5  1  3
 Page Hit : 4
 Page Faults : 6
/*
    Node JS Program for
    LRU Cache Implementation
*/
class LRU
{
    constructor(size)
    {
        this.size = size;
        this.pageFaults = 0;
        this.pageHit = 0;
        this.record = [];
    }
    refer(page)
    {
        if (!this.record.includes(page))
        {
            this.pageFaults++;
        }
        if (this.record.includes(page))
        {
            this.pageHit++;
            // When given page alredy exist
            // So we need to remove it
            var index = this.record.indexOf(page);
            if (index !== -1) {
              this.record.splice(index, 1);
            }
        }
        else if (this.record.length == this.size)
        {
            // In case record size is full so remove first element
            this.record.splice(0, 1);
        }
        // Add new node at the last
        this.record.push(page);
    }
}

function main()
{
    var cache = new LRU(4);
    // Page value
    var page = [6, 2, 4, 2, 1, 3, 2, 5, 1, 3];
    // Get number of elements
    var n = page.length;
    for (var i = 0; i < n; ++i)
    {
        cache.refer(page[i]);
    }
    process.stdout.write("\n Cache Value : ");
    // Display cache value
    for (var i = 0; i < cache.record.length; ++i)
    {
        process.stdout.write("  " + cache.record[i]);
    }
    process.stdout.write("\n Page Hit : " + cache.pageHit);
    console.log("\n Page Faults : " + cache.pageFaults);
}
main();

Output

 Cache Value :   2  5  1  3
 Page Hit : 4
 Page Faults : 6
#    Python 3 Program for
#    LRU Cache Implementation
class LRU :
    def __init__(self, size) :
        self.size = size
        self.pageFaults = 0
        self.pageHit = 0
        self.record = []
    
    def refer(self, page) :
        if (page not in self.record) :
            self.pageFaults += 1
        
        if (page in self.record) :
            self.pageHit += 1
            #  When given page alredy exist
            #  So we need to remove it
            self.record.remove(page)
        elif (len(self.record) == self.size) :
            #  In case record size is full so remove first element
            del self.record[0]
        
        #  Add new node at the last
        self.record.append(page)
    

def main() :
    cache = LRU(4)
    #  Page value
    page = [6, 2, 4, 2, 1, 3, 2, 5, 1, 3]
    #  Get number of elements
    n = len(page)
    i = 0
    while (i < n) :
        cache.refer(page[i])
        i += 1
    
    print("\n Cache Value : ", end = "")
    i = 0
    #  Display cache value
    while (i < len(cache.record)) :
        print("  ", cache.record[i], end = "")
        i += 1
    
    print("\n Page Hit : ", cache.pageHit, end = "")
    print("\n Page Faults : ", cache.pageFaults)

if __name__ == "__main__": main()

Output

 Cache Value :    2   5   1   3
 Page Hit :  4
 Page Faults :  6
#    Ruby Program for
#    LRU Cache Implementation
class LRU 
    # Define the accessor and reader of class LRU
    attr_reader :record, :size, :pageHit, :pageFaults
    attr_accessor :record, :size, :pageHit, :pageFaults
    def initialize(size) 
        self.size = size
        self.pageFaults = 0
        self.pageHit = 0
        self.record = []
    end

    def refer(page) 
        if (!self.record.include?page) 
            self.pageFaults += 1
        end

        if (self.record.include?page) 
            self.pageHit += 1
            #  When given page alredy exist
            #  So we need to remove it
            self.record.delete(page)
        elsif (self.record.length == self.size) 
            #  In case record size is full so remove first element
            self.record.delete_at(0)
        end

        #  Add new node at the last
        self.record.push(page)
    end

end

def main() 
    cache = LRU.new(4)
    #  Page value
    page = [6, 2, 4, 2, 1, 3, 2, 5, 1, 3]
    #  Get number of elements
    n = page.length
    i = 0
    while (i < n) 
        cache.refer(page[i])
        i += 1
    end

    print("\n Cache Value : ")
    i = 0
    #  Display cache value
    while (i < cache.record.length) 
        print("  ", cache.record[i])
        i += 1
    end

    print("\n Page Hit : ", cache.pageHit)
    print("\n Page Faults : ", cache.pageFaults, "\n")
end

main()

Output

 Cache Value :   2  5  1  3
 Page Hit : 4
 Page Faults : 6
import scala.collection.mutable._;
/*
    Scala Program for
    LRU Cache Implementation
*/
class LRU(var record: ArrayBuffer[Int],
    var size: Int,
        var pageHit: Int,
            var pageFaults: Int)
{
    def this(size: Int)
    {
        this(new ArrayBuffer[Int](),size,0,0);
    }
    def refer(page: Int): Unit = {
        if (!this.record.contains(page))
        {
            this.pageFaults += 1;
        }
        if (this.record.contains(page))
        {
            this.pageHit += 1;
            // When given page alredy exist
            // So we need to remove it
            this.record -= page;
        }
        else if (this.record.size == this.size)
        {
            // In case record size is full so remove first element
            this.record.remove(0);
        }
        // Add new node at the last
        this.record += page;
    }
}
object Main
{
    def main(args: Array[String]): Unit = {
        var cache: LRU = new LRU(4);
        // Page value
        var page: Array[Int] = Array(6, 2, 4, 2, 1, 3, 2, 5, 1, 3);
        // Get number of elements
        var n: Int = page.length;
        var i: Int = 0;
        while (i < n)
        {
            cache.refer(page(i));
            i += 1;
        }
        print("\n Cache Value : ");
        i = 0;
        // Display cache value
        while (i < cache.record.size)
        {
            print("  " + cache.record(i));
            i += 1;
        }
        print("\n Page Hit : " + cache.pageHit);
        println("\n Page Faults : " + cache.pageFaults);
    }
}

Output

 Cache Value :   2  5  1  3
 Page Hit : 4
 Page Faults : 6
/*
    Kotlin Program for
    LRU Cache Implementation
*/
class LRU
{
    var record: MutableList < Int > ;
    var size: Int;
    var pageHit: Int;
    var pageFaults: Int;
    constructor(size: Int)
    {
        this.size = size;
        this.pageFaults = 0;
        this.pageHit = 0;
        this.record = mutableListOf < Int > ();
    }
    fun refer(page: Int): Unit
    {
        if (!this.record.contains(page))
        {
            this.pageFaults += 1;
        }
        if (this.record.contains(page))
        {
            this.pageHit += 1;
            // When given page alredy exist
            // So we need to remove it
            this.record.remove(page);
        }
        else if (this.record.size == this.size)
        {
            // In case record size is full so remove first element
            this.record.removeAt(0);
        }
        // Add new node at the last
        this.record.add(page);
    }
}
fun main(args: Array < String > ): Unit
{
    val cache: LRU = LRU(4);
    // Page value
    val page: Array < Int > = arrayOf(6, 2, 4, 2, 1, 3, 2, 5, 1, 3);
    // Get number of elements
    val n: Int = page.count();
    var i: Int = 0;
    while (i < n)
    {
        cache.refer(page[i]);
        i += 1;
    }
    print("\n Cache Value : ");
    i = 0;
    // Display cache value
    while (i < cache.record.size)
    {
        print("  " + cache.record[i]);
        i += 1;
    }
    print("\n Page Hit : " + cache.pageHit);
    println("\n Page Faults : " + cache.pageFaults);
}

Output

 Cache Value :   2  5  1  3
 Page Hit : 4
 Page Faults : 6


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