What is ConcurrentHashMap? In Java, ConcurrentHashMap is a class that implements the Map<K,V> interface, and it is synchronised. When we declare a HashMap<K,V> in Java, the JVM internally assigns 16 buckets of memory to it. In ConcurrentHashMap, the lock is on each of the 16 buckets, which facilitates multiple write operations on different buckets concurrently… Read More »
1. String vs. StringBuilder | When to use String and StringBuilder in Java? Feature String StringBuilder Definition String is an immutable class in Java, which means once an object is created, its value cannot be changed. StringBuilder is used to create mutable string objects, which means we can change the content of the StringBuilder object.… Read More »
CORS stands for Cross-Origin Resource Sharing, a security feature that is implemented by web browsers to protect users from malicious websites that try to access data on another domain without permission. It occurs when an application attempts to make a request to a different domain than the one that served the application. In an Angular… Read More »
Angular is an open-source, Typescript based web application framework that runs on Node.js. In this article, we’ll learn how to create a real time weather app using Angular that retrieves weather information based on the name of the city. Steps to build real time weather app Step 1- How to create angular project in Visual… Read More »
In the publish-subscribe messaging system, each message has multiple consumers. Topics are based on a publish subscribe messaging model where each message is broadcast to multiple subscribers who are listening to the topic. Key feature of Publish Subscribe messaging model When to use publisher subscribe messaging model The publish-subscribe messaging model should be used when… Read More »
In a point to point messaging model, each message has one producer and one consumer. Queues are based on a point-to-point messaging model where messages are sent to queues and each message has only one producer and one consumer. In queue, messages are guaranteed to be delivered to only one consumer. In the point-to-point messaging… Read More »
What is Java Messaging Service (JMS)? The Java Message Service (JMS) is a messaging standard (API) that allows Java applications to create, send, and receive messages asynchronously and reliably. It provides a common interface for different messaging providers, promoting loose coupling between clients and systems. This guide simplifies JMS core concepts with practical examples. Why… Read More »
What is Dependency? When a class or object depends on another class or object for its functioning, it is called dependency. For example, Say we have two classes: company and employee, and the company class needs employees to work. We can say that company class depends on the employee. What is Circular Dependency? When we… Read More »
Kafka producers are those that publish the message to the Kafka topics, and Kafka consumers consume those messages by subscribing to the Kafka topics. To learn more, please refer Apache Kafka Architecture. In this tutorial, we will learn to create a producer-consumer model using the Kafka console. In this tutorial, we will learn about Kafka… Read More »
On May 5, 2020, the auto-incrementing ID column in a shared database table on Github grew larger than what the MySQL integer type could handle. The github-blog page has all of the incident’s information. We will simulate the situation in which we force the value of our auto-increment ID column in the MySQL database to… Read More »