http://www.cnblogs.com/panfeng412/archive/2013/02/21/open-source-real-time-stream-processing-systems.html
http://www-01.ibm.com/support/knowledgecenter/SSCRJU_3.0.0/com.ibm.swg.im.infosphere.streams.product.doc/doc/tlkt-container.html
http://www.onjava.com/pub/a/onjava/2007/03/07/esper-event-stream-processing-and-correlation.html?page=3