Esper[1] was the go-to solution for these problems, in the last generation - the reason there are alternatives is primarily because that was GPLv2. And even fr

Esper[1] was the go-to solution for these problems, in the last generation - the reason there are alternatives is primarily because that was GPLv2. And even from the same stable as Kafka, there's Samza[2] [1] - http://www.espertech.com/esper/ http://www.espertech.com/esper/ [2] - https://speakerdeck.com/ept/turning-the-database-inside-out-with-apache-samza https://speakerdeck.com/ept/turning-the-database-inside-out-...