Introduction : Let’s assume that in your application(not reactive), there is an API which depends on the response from event listeners. In real time, we use lot of event listeners in event driven architectures. It can be Another thread completion Kafka consumer completion Redis key state change, etc., Problem : Let’s say we create an… Continue reading Make request thread to wait and notify
AWS – Infrastructure as Code
While reading more about AWS & its resources, we came across the term Infrastructure as Code(IaC) in many places like Amazon Elastic Beanstalk(EB), CloudFormation, SAM(Serverless Application Model) and AMS CDK(Cloud Development Kit).We like to explore a bit more about Infrastructure as Code and like to understand the concepts & differences between EB, CDK, SAM, CloudFormation.… Continue reading AWS – Infrastructure as Code
Selection Sort
Prerequisite: Algorithm , Sorting , Asymptotic complexity(Time & Space Complexity) Introduction : If someone gives you a list to sort and we are not aware of various sorting algorithm, most of us will write the below code, Code: public int[] doSelectionSort(int[] ip) { int temp = 0; for(int i=0;i<ip.length-1;i++) { temp = i; for(int j=i+1;j<ip.length;j++)… Continue reading Selection Sort
Design Patterns
A programmer may write a better program to solve a problem. He may consider the memory management, Asympotatic complexity. An Object oriented programmer will see everything as an object. Once he got the requirements, he can easily see all the objects or entities involved in… Continue reading Design Patterns
Insertion sort
Prerequisite: Algorithm, Sorting, Asymptotic complexity(time complexity, space complexity) Introduction: Insertion sort will take elements from 0 to n and compare & swap it with the left part of the array which is already sorted among the elements, until it find the right place where the element has to be. You may be clear, when look… Continue reading Insertion sort
JMS
(The main objective of this article is to identify the places where JMS is needed) JMS(Java messaging service) is a widely used technology. It has two different mechanism called Queue and Topic(publish-subscribe). A queue may have multiple listeners. But when u push a message, it will be picked up by only one listener whereas in topic, message will… Continue reading JMS
Bubble Sort
Prerequisite: Algorithm, Sorting, Asymptotic complexity(time complexity, space complexity) Introduction: Bubble sort may look same as insertion sort, because the outcome of the bubble sort looks same as insertion sort. In case of sorting in ascending order, Insertion sort will keep taking out the min value at end of the each iteration, whereas bubble sort will take out… Continue reading Bubble Sort
Quick sort
Introduction Pivot, Divide and Conquer, Wall and Randomized Algorithms are the four terminologies we should know when come to quick sort. Pivot value selection Randomly select an element from the array. Here, we are choosing the last element as a pivot. Wall The left side of the wall will always have values that are smaller… Continue reading Quick sort
JQuery ajax GET request call
Below is the example of an jQuery ajax call. It’s making a GET request. <head> <script> $( document ).ready(function() { $( “#mainMenuArea” ).load( “html/mainMenu.html” ); $.ajax({url: “http://localhost:8080/services/usersproducts/allproduct”, success: function(result){ var productArray = result.products $( “#div_appArea” ).append(“<table>”); $( “#div_appArea” ).append(“<tr><th>Mobile No<th><th>Possession Status<th>”); $( “#div_appArea” ).append(“<th>Company Name<th><th>Recommended<th></tr>”); $( “#div_appArea” ).append(“<th>User Product Id<th><th>Recommended<th></tr>”); for(var i in productArray){ $(… Continue reading JQuery ajax GET request call
Immutable objects
An immutable object is an object whose state cannot be modified after its creation. Once object is created, you can not change the properties of it. Immutable object is sort of design pattern. We have to follow certain rules or patterns to create immutable objects. In java, once you initialized an object , you’ll never… Continue reading Immutable objects