Introduction The law of Demeter states that objects should only interact with their immediate surroundings. Specifically: That means, the methods of an object should only call methods on other objects that: And it should not call methods on objects that: Here is a simple diagram to illustrate the principle: Friends, Strangers??? OK, some new terminologies … Read more
Introduction to the Keytool utility The keytool utility is a command-line tool included with the Java Development Kit (JDK) that allows users to manage the keystore that contains their keys and certificates. The keystore is a repository of security certificates, either generated by the keytool or imported from other sources, that can be used to … Read more
Introduction What is a database connection pool A database connection pool is a cache of open database connections that can be used by any thread that needs to access a database. Instead of creating a new connection each time a thread needs to access the database, the thread can borrow a connection from the pool … Read more
Overview In this quick tutorial, I will show you how to configure Spring logging to Elasticsearch so you can search, visualize and do many useful things with your log. Things that you cannot do by looking at the console output. Let’s get started. Create ELK stack using Docker Compose If you don’t have Elasticsearch running … Read more
Overview Redis is an in-memory data structure store that is often used as a database, cache, and message broker. There are several benefits to using Redis, including: In this post, we are going to discuss the different use cases of Redis in software systems. Before you start, if you want to start a Redis instance … Read more
In computer science, the CAP theorem states that it is impossible for a distributed computer system to simultaneously provide more than two of the following three guarantees: In other words, the CAP theorem states that it is impossible to simultaneously guarantee consistency, availability, and partition tolerance in a distributed system. This means that in the … Read more