Events could be published via Google Guavas Event Bus. See [tutorial here](http://www.javacodegeeks.com/2012/12/google-guava-eventbus-and-java-7-watchservice-for-event-programming.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+JavaCodeGeeks+%28Java+Code+Geeks%29)
