Hands-On with RFID/NFC

Most of us have been using some form of a badge or tag to enter the office building OR tap a credit card to make a payment at the checkout.

Ever wondered what is really going on behind the scene when we tap a card on the card reader ???

This is where the RFID/NFC technology comes into play. We will leverage a Raspberry Pi 4 along with a Mifare RC522 RFID module to get our hands dirty. Here is the link to the article demonstrating the concept of RFID/NFC:

Hands-On with RFID/NFC

Enjoy 🙂 !!!

The JVM ‘Invoke…’ Instructions

Ever taken a peek at the Java bytecode of a class to see what is really going on under-the-hood especially with the various method calls ???

There are five different JVM method invocation instructions and they come into play at different scenarios. Here is the link to the article introducing the various JVMinvoke…‘ instructions:

The JVM ‘Invoke…’ Instructions

Enjoy 🙂 !!!

Introduction to Apache Calcite

Ever wondered what is the common ingredient behind some of the most popular Big data frameworks, such as Apache Drill, Apache Druid, Apache Flink, Apache Phoenix, Dremio, and others ???

Apache Calcite is a popular open source Java framework for building and managing data sources using the SQL language. Here is the link to the article introducing Apache Calcite:

Introduction to Apache Calcite

Enjoy 🙂 !!!