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Introduction The Adapter design pattern is a structural pattern that allows objects with incompatible interfaces to work together. It does this by converting the interface of one class into another interface that the client expects. This pattern is often used to make existing classes work with each other without modifying their source code. Real-world example … Read more
Introduction The proxy pattern is a structural design pattern. It is used to provide a surrogate or placeholder object for another object, which can be used to control access to the original object or to add additional functionality. Use Cases Use the proxy pattern when: The client (the one who needs the functionalities of the … Read more
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