Reactive Stream - Example of implementation of Publisher
https://medium.com/@olehdokuka/mastering-own-reactive-streams-implementation-part-1-publisher-e8eaf928a78c
https://medium.com/@olehdokuka/mastering-own-reactive-streams-implementation-part-1-publisher-e8eaf928a78c
It is worth to read through The Reactive Manifesto definition.
/etc/sysctl.conf
Websocket protocol details.\ http://lucumr.pocoo.org/2012/9/24/websockets-101/
It is an amazing tool to monitor Java application such as thread cpu usage etc.