ListenNotify from postgres using Java

// listen for notification from postgress
https://github.com/alaisi/postgres-async-driver/blob/a5826122adcf3beee3fdb6460bd0ec135c5aa4f8/src/test/java/com/github/pgasync/impl/ListenNotifyTest.java
https://www.javacodegeeks.com/2015/10/listen-to-notifications-from-postgresql-with-scala.html


https://jdbc.postgresql.org/documentation/91/listennotify.html

https://dzone.com/articles/reactive-postgresql-listen-to-notifications-with-s


http://stackoverflow.com/questions/21632243/how-do-i-get-asynchronous-event-driven-listen-notify-support-in-java-using-a-p