Guava - EventBus example

package com.areoit.guava.eventbus;

import org.junit.Test;
import static org.junit.Assert.assertEquals;

import com.google.common.eventbus.EventBus;
import com.google.common.eventbus.Subscribe;

public class EventBusIntegerEventsTests {
 
 private static final String EVENT_BUS_ID = "numbers";

 /**
  * Case:
  *  + one listener
  *  + listener subcribe for Integer event
  *  + listener subcribe for Number event
  *  + REMEMBER: Integer IS-A Number
  */
 @Test
 public void oneIntegerEventTwoSubscribingMethod() {
 
  IntegerListener listener = new IntegerListener();
  Integer integerEvent = Integer.MAX_VALUE;
  
  EventBus eventBus = new EventBus(EVENT_BUS_ID);
  eventBus.register(listener);  
  eventBus.post(integerEvent);
  
  //check event counters
  int integerCount 
   = listener.getIntegerEventCount();
  
  int numberCount 
   = listener.getNumberEventCount();
  
  assertEquals(1, integerCount);
  assertEquals(1, numberCount);
 }
 

 class IntegerListener  {

  private int integerEventCount = 0;
  private int numberEventCount = 0;
   
  @Subscribe
  public void onIntegerEvent(Integer event) {
   ++integerEventCount;
  }
  
  @Subscribe
  public void onNumberEvent(Number event) {
   ++numberEventCount;
  }

  public int getIntegerEventCount() {
   return integerEventCount;
  }

  public int getNumberEventCount() {
   return numberEventCount;
  }
 }
 
 
}