OOP is all about Encapsulation Yes, that’s right. Object Oriented Programming aims to encapsulate properties and methods into a consolidated object so that’s operations can be carried out on the object. The whole aim was to move from procedural functions which were not easy to reason about and prove correctness. But this principle often gets violated and people write procedural code using objects. Classic Example is: class Rectangle { private Long length; private Long breadth; //gettters //setters //constructors } And caller calculates area by:

Linux Terminal Controlled Slack WebHook This is a simple use case of slack webhooks. Slack webhooks can be configured to send messages when some events occur, i.e. we trigger the hook and the hook sends the message to slack channel configured. I have set up a workspace (for my own personal experimentations) and created a webhook which is a fairly simple process. Web Hook can be called via HTTP POST call with required message.

21 lessons for the 21st Century (Book Review) 21 Lessons for the 21st Century by Yuval Noah Harari My rating: 5 of 5 stars We live in an extremely complicated world. It’s so difficult to make sense even of the tiniest realm of our lives. Religious dogma, political gambles, economic disparity, an ever-increasing gap between poor and rich, promises and dangers of new technologies like Machine learning and artificial intelligence form the most confusing crossroad in all of the recorded human histories so far.

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Postfix Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail. This is required in order to be able to send mails from the local machine (without using any vendor’s client) Installation sudo apt-get install postfix Postfix has be configured. The suggested way to do is via: sudo dpkg-reconfigure postfix. You can also directly edit /etc/postfix/main.cf file and make changes to the configuration. For most of the purposes dpkg-reconfigure should suffice.

Executing commands remotely and returning results One of the common usage is to log into remote machine and check some process stat to see if some program is running or not. Instead of logging in, executing command and then returning back, we can do it in a single shot by providing the command to be executed as an argument. ssh loguser@$x.x.x "ps -ef | grep kafka" loguser 12214 12213 0 23:47 ?

This miniblog is adpated from this linkedin course The tweet that started it all Install springboot cli Easiest way is via sdkman. sdk install springboot Groovy classFile: ThisClassWillActuallyRun.groovy @Controller class ThisWillActuallyRun { @RequestMapping("/") @ResponseBody String home() { "Hello World!" } } Running the app: spring ThisWillActuallyRun Output: . ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .

Kafka is the platform for stream processing. The real power of Kafka comes in the scenario of distributed computing where Kafka logs can be considered as a single source of ordered-truths. Those logs can be consumed by all the relevant consumers in their own pace and own time. (within the retention period, of course). Here is a great LinkedIn blog on log, which is the core of Kafka platform. In summary, Kafka has a number of clustered broker nodes (which actually store message inside various topics which can be partitioned (default is 3)).