App Based Subscription model

Events.js

var eventEmitter3 = require('eventemitter3');
var EE = new eventEmitter3();

EE.on('unsubscribe',function(appName){
  console.log("Unsubscribe request received for " + appName);
  removeListener(appName);
});

function addListener(appName)
{

if(!EE.listeners(appName, true))
{
  console.log("Adding a new listener");
  EE.on(appName, function(value){
    console.log("I fired for " + appName + " and my value is " + value);
  });
}

}

function removeListener(appName)
{
EE.removeListener(appName);
}



console.log("Listener Count " + EE.listeners('app1').length);  // should be 0
EE.emit('app1');
addListener('app1');
console.log("Listener Count " + EE.listeners('app1').length); // should be 1
EE.emit('app1',"Value 1");
EE.emit('app1',"Value 2");
EE.emit('app1',"Value 3");
EE.emit('app1',"Value 4");
addListener('app1'); // does nothing it is here already
addListener('app2'); // new listener!!
console.log("Listener Count " + EE.listeners('app1').length); // should still be 1
EE.emit('app2',"Application2");
EE.emit('app1',"Application1");

EE.emit('unsubscribe', 'app1'); // no more App1 subscribtions
removeListener('app12344532'); // we can remove listeners that don't exist so no risk of crashing
console.log("Listener Count " + EE.listeners('app1').length); // should be 0
console.log("Finished");
EE.emit('app1',"Application1"); // nothing will fire here