An example of PostgreSQL function Assume that you have a table where Subscriptions are stored, example given you have bought a new Spotify subscription, for 3, 6 or 12 months. In this table , the data that are kept are : the creation date (created_at) last update timestamp (last_updated) start_date…

What is Redis: Redis is an open source , in-memory data structure store used as a database, cache, message broker, and streaming engine. More info in https://redis.io/docs/about/ Jedis is a client library in Java for Redis Install Redis Check the instructions in https://redis.io/docs/getting-started/installation/ Java implementation Add the Maven dependency in…

Asynchronous programming in Action Modern life is fast. We eat fast food, demand faster internet, shorter delivery times and instant news. So modern applications need to be fast. Fast and reliable. One way to achieve this is by using asynchronous programming. In Asynchronous programming, main thread continues its execution without to be blocked by separate…

Git is the most commonly used version control system used among developers. No need to mention its advantages, you can google them! But, let’s admit it, all developers who love Git, have faced (or still face) difficulties with it and even the most experienced of them keep a cheat sheet…

Sexy, Chic , Powerful Sexy and Chic because they produce elegant code by constraining the choices of what you can pass. Powerful, because by limit your choices , actually increase the code effectiveness (it means the code you write today will work if reused 10 years later ) But …

Step by step, how to create an HttpClient that supports NTLM authentication in Java — The Problem: Suppose that we have an instance of Apache HttpClient ( we will use the CloseableHttpClient implementation). We want to perform ΗΤΤP requests to a server that it uses the NTLM authentication security. Some Theory: NTLM is a challenge-response authentication protocol which uses three messages to authenticate a client . Participants: