// Redis server analogy for programmers

function redisServer(id, srv){
  this.upvotes = 0;
  this.id = id;
  this.central = srv;
  return this;
}
redisServer.prototype.resetUpvotes = function(){
  this.upvotes = 0;
  console.log("redisServer #" + this.id + " flushed it's cache");
  return this;
}
redisServer.prototype.addUpvote = function(){
  this.upvotes++;
  console.log("redisServer #" + this.id + " got an upvote!");
  return this;
}
redisServer.prototype.sendUpvotes = function(){
  this.central.upvotes += this.upvotes;
  console.log("redisServer #" + this.id + " sent it's upvotes[" + this.upvotes + "] to central");
  return this;
}

function dummyUser(srv){
  this.srv = srv[Math.floor(Math.random() * srv.length)];
  console.log("dummyUser has joined server " + this.srv.id);
  return this;
};
dummyUser.prototype.requestImage = function(){
  console.log("dummyUser on server " + this.srv.id + " has requested an image and got " + central_server.serveImage());
  return this;
};
dummyUser.prototype.browseImgur = function(){
  var self = this;
  this.interval = setInterval(function(){
    if(Math.random() > 0.9){
      self.srv.addUpvote();
      console.log("dummyUser liked an image and upvoted it on redisServer #" + self.srv.id);
    };
    if(Math.random() > 0.9){
      self.requestImage();
    };
  }, 1000);
  return this;
};

function centralServer(){
  this.upvotes = 0;
  this.image = ["cat.gif", "dickbutt.gif", "doge.gif"];
  return this;
}
centralServer.prototype.collectUpvotes = function(){
  for(i = redis_servers.length; i--;){
    redis_servers[i].sendUpvotes().resetUpvotes();
  }
  return this;
}
centralServer.prototype.serveImage = function(){
  return this.image[Math.round(Math.random() * this.image.length)];
}
centralServer.prototype.listenRedis = function(){
  var self = this;
  this.interval = setInterval(function(){
    self.collectUpvotes();
  }, 10000);
  return this;
}

var redis_servers = []
  , dummy_users = []
  , central_server = new centralServer().listenRedis();
for(i = 20; i--;){ // building 20 servers
  redis_servers[i] = new redisServer(i, central_server);
};
for(i = 20; i--;){ // building 100 dummy users
  dummy_users[i] = new dummyUser(redis_servers).browseImgur();
};