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package com.interview.misc;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class LoadBalancers {

private List<String> servers = new ArrayList<String>();

Map<String,Integer> index = new HashMap<String,Integer>();

public void addServer(String name){

servers.add(name);

index.put(name, servers.size()-1);

}

public void removeServer(String name){

Integer pos = index.get(name);

if(pos == null){

throw new IllegalArgumentException();

}

servers.set(pos, servers.get(servers.size()-1));

servers.remove(servers.size()-1);

}

public String getRandom(){

int r = (int)(Math.random()*1000);

return servers.get(r%servers.size());

}

public static void main(String args[]){

LoadBalancers lb = new LoadBalancers();

lb.addServer("1");

lb.addServer("2");

lb.addServer("3");

lb.addServer("4");

lb.addServer("5");

System.out.print(lb.getRandom());

System.out.print(lb.getRandom());

System.out.print(lb.getRandom());

System.out.print(lb.getRandom());

lb.removeServer("3");

lb.removeServer("1");

System.out.print(lb.getRandom());

System.out.print(lb.getRandom());

System.out.print(lb.getRandom());

System.out.print(lb.getRandom());

}

}