Introduction This post is what I wish I have when starting with RabbitMQ. It contains: Let’s get started. Code Repo The code in this post is available here on Github. Important concepts Here are the important concepts in RabbitMQ: Exchange A messaging component in RabbitMQ that receives messages from producers and routes them to queues … Read more
Introduction Recently, I’ve been working on an angular app. One issue I had was I couldn’t see the loading bar on prod. I didn’t detect this problem in development because on local, the services loaded so fast. So, since I was using HAProxy, I thought there should be some config to add some delays to … Read more
Introduction If you run the following code: There are chances you will get the following exception: I said “there are chances” because you run the same code repeatedly, and sometimes there is no exception thrown. So, what is ConcurrentModificationException and when you might encounter it. The JDK’s said: This exception may be thrown by methods … Read more
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