Event bus http://code.google.com/p/guava-libraries/wiki/EventBusExplained http://camel.apache.org/guava-eventbus.html http://codingjunkie.net/guava-eventbus/ http://tomaszdziurko.pl/2012/01/google-guava-eventbus-easy-elegant-publisher-subscriber-cases/ 성능비교 자료 : http://codeblock.engio.net/?p=37