Code Chronicles

Advanced engineering concepts explained through code, diagrams, and real-world examples

Search across 140 posts, 19 explainers, and 59 topics

Template Method Design Pattern

Use inheritance to vary parts of an algorithm

Template Method Design Pattern

design-patterns java

State Design Pattern

Replace conditional logic with polymorphic state objects

State Design Pattern

design-patterns java

Command Design Pattern

Queue, log, and undo operations by encapsulating them as objects

Command Design Pattern

design-patterns java

Proxy Design Pattern

Add a layer of control without changing the original object

Proxy Design Pattern

design-patterns java

Facade Design Pattern

Hide complexity behind a simple, unified API

Facade Design Pattern

design-patterns java

Adapter Design Pattern

Connect components that weren't designed to connect

Adapter Design Pattern

design-patterns java

Builder Design Pattern

Create objects with many optional parameters without telescoping constructors

Builder Design Pattern

design-patterns java

Strategy Design Pattern

Define a family of algorithms and make them interchangeable

Strategy Design Pattern

design-patterns java

Factory Method Design Pattern

Decouple object creation from the code that uses objects

Factory Method Design Pattern

design-patterns java

Singleton Design Pattern

Control object creation and share state across your application

Singleton Design Pattern

design-patterns java

Github Actions for Android

CI/CD is a development practice that delivers software to the end user with speed and...

Github Actions for Android

android ci-cd

Pairing matrix for agile teams

I work in an agile team which follows extreme programming practices like pairing programming. But...

Pairing matrix for agile teams

ruby agile

How to integrate GraphQL with Sitecore using JSS

This blog contains step by step instructions on how you can integrate GraphQL with Sitecore....

How to integrate GraphQL with Sitecore using JSS

sitecore graphql

Flutter under the hood

This blog is intended to provide an overview of Flutter architecture and how it executes...

Flutter under the hood

flutter mobile-cross-platform

Monitoring individual queue in sidekiq

The default interface of sidekiq allows you to see the number of processed and failed jobs...

Monitoring individual queue in sidekiq

rails ruby

Why aren't you using binstubs yet?

If you have been using bundle exec to run any executable gem and tired of...

Why aren't you using binstubs yet?

rails ruby

Offline Mode Of Android Apps

I presented this talk in droid con London 2017. Here are the slides for download....

Offline Mode Of Android Apps

android presentation

My upcoming talk in DroidConUK

I am very excited to be joining DroidConUK to share my learnings on Offline Mode...

My upcoming talk in DroidConUK

android conference

Integrating Sherlock with android apps

Its always a challenge for an app tester to report crashes to the developers. Because...

Integrating Sherlock with android apps

android

Why your android application needs awareness api

Google introduced android awareness api in I/O 16. It offers a lot of awesome features...

Why your android application needs awareness api

android

Explore All Posts

The Gang of Four Patterns Every Developer Should Know

The Gang of Four Patterns Every Developer Should Know

Majority Quorum in Distributed Systems Explained

Majority Quorum in Distributed Systems Explained

CQRS Pattern: Splitting Read and Write Models

CQRS Pattern: Splitting Read and Write Models

The Complete HTMX Guide: From Zero to Production

The Complete HTMX Guide: From Zero to Production

Role of Queues in System Design

Role of Queues in System Design

How Amazon S3 Stores 100 Trillion Objects Without Losing One

How Amazon S3 Stores 100 Trillion Objects Without Losing One

Caching Strategies Explained: The Complete Guide

Caching Strategies Explained: The Complete Guide

How Google Ads Supports 4.8 Billion Users with a SQL Database

How Google Ads Supports 4.8 Billion Users with a SQL Database

Two-Phase Commit: The Protocol That Keeps Distributed Transactions Honest

Two-Phase Commit: The Protocol That Keeps Distributed Transactions Honest

Modular Monolith: The Architecture Most Teams Actually Need

Modular Monolith: The Architecture Most Teams Actually Need

The Complete Guide to Server-Sent Events (SSE)

The Complete Guide to Server-Sent Events (SSE)

Long Polling Explained: Build Real-Time Apps Without WebSockets

Long Polling Explained: Build Real-Time Apps Without WebSockets

How Stock Brokers Push 1 Million Price Updates Per Second to Your Screen

How Stock Brokers Push 1 Million Price Updates Per Second to Your Screen

HOCON vs YAML vs TOML vs JSON: Complete Configuration Format Comparison

HOCON vs YAML vs TOML vs JSON: Complete Configuration Format Comparison

Heartbeat: How Distributed Systems Know You're Still Alive

Heartbeat: How Distributed Systems Know You're Still Alive

Your JSON is Costing You Thousands: Why TOON Might Save Your Budget

Your JSON is Costing You Thousands: Why TOON Might Save Your Budget

Stop Blocking Your Paying Customers: Build a Smart Rate Limiter

Stop Blocking Your Paying Customers: Build a Smart Rate Limiter

Visitor Design Pattern

Visitor Design Pattern

How Shopify Powers 5 Million Stores Without Breaking a Sweat

How Shopify Powers 5 Million Stores Without Breaking a Sweat

WebTransport: The Protocol That Fixes What's Broken in WebSockets

WebTransport: The Protocol That Fixes What's Broken in WebSockets

What Actually Happens When You Type a URL

What Actually Happens When You Type a URL

Interpreter Design Pattern

Interpreter Design Pattern

Postgres 18: The Release That Makes Databases Fast Again

Postgres 18: The Release That Makes Databases Fast Again

Java 25 is Finally Here: The LTS Release That Changes Everything

Java 25 is Finally Here: The LTS Release That Changes Everything

How Ticket Booking Systems Handle 50,000 People Fighting for One Seat

How Ticket Booking Systems Handle 50,000 People Fighting for One Seat

Hash Collisions: The Hidden Performance Killer in Your Code

Hash Collisions: The Hidden Performance Killer in Your Code

Memento Design Pattern

Memento Design Pattern

Why JWT Replaced Sessions: Building Auth That Scales

Why JWT Replaced Sessions: Building Auth That Scales

How Kafka Works: The Engine Behind Real-Time Data Pipelines

How Kafka Works: The Engine Behind Real-Time Data Pipelines

Kubernetes Architecture: The Operating System for the Cloud

Kubernetes Architecture: The Operating System for the Cloud

How Meta Achieves 99.99999999% Cache Consistency

How Meta Achieves 99.99999999% Cache Consistency

Flyweight Design Pattern

Flyweight Design Pattern

How Slack Built a System That Handles 10+ Billion Messages

How Slack Built a System That Handles 10+ Billion Messages

Paxos: The Democracy of Distributed Systems

Paxos: The Democracy of Distributed Systems

Write-Ahead Log: The Golden Rule of Durable Systems

Write-Ahead Log: The Golden Rule of Durable Systems

Prototype Design Pattern

Prototype Design Pattern

Distributed Counter System Design

Distributed Counter System Design

How Stripe Prevents Double Payments

How Stripe Prevents Double Payments

GitHub Actions: CI/CD Automation Basics

GitHub Actions: CI/CD Automation Basics

55 Million Requests Per Second: Inside Cloudflare's Magic

55 Million Requests Per Second: Inside Cloudflare's Magic

Bridge Design Pattern

Bridge Design Pattern

How Uber Finds Nearby Drivers at 1 Million Requests per Second

How Uber Finds Nearby Drivers at 1 Million Requests per Second

The Complete Guide to k6 Load Testing

The Complete Guide to k6 Load Testing

WhatsApp's Scaling Secrets: A Deep Dive into System Design and Architecture

WhatsApp's Scaling Secrets: A Deep Dive into System Design and Architecture

Prompt Engineering Basics for Software Developers

Prompt Engineering Basics for Software Developers

Git Command Line Basics: Essential Commands for Software Developers

Git Command Line Basics: Essential Commands for Software Developers

Taming Pipeline Chaos: How I Used GitLab APIs and GPT to Analyze Thousands of Failures and Boost Stability

Taming Pipeline Chaos: How I Used GitLab APIs and GPT to Analyze Thousands of Failures and Boost Stability

Iterator Design Pattern

Iterator Design Pattern

How to Exclude a Single Module from `sbt test` in a Multi-Module Scala Project

How to Exclude a Single Module from `sbt test` in a Multi-Module Scala Project

Mediator Design Pattern

Mediator Design Pattern

Chain of Responsibility Design Pattern

Chain of Responsibility Design Pattern

Composite Design Pattern

Composite Design Pattern

Abstract Factory Design Pattern

Abstract Factory Design Pattern

Template Method Design Pattern

Template Method Design Pattern

State Design Pattern

State Design Pattern

Command Design Pattern

Command Design Pattern

Proxy Design Pattern

Proxy Design Pattern

Facade Design Pattern

Facade Design Pattern

Adapter Design Pattern

Adapter Design Pattern

Builder Design Pattern

Builder Design Pattern

Strategy Design Pattern

Strategy Design Pattern

Factory Method Design Pattern

Factory Method Design Pattern

Singleton Design Pattern

Singleton Design Pattern

Github Actions for Android

Github Actions for Android

Pairing matrix for agile teams

Pairing matrix for agile teams

How to integrate GraphQL with Sitecore using JSS

How to integrate GraphQL with Sitecore using JSS

Flutter under the hood

Flutter under the hood

Monitoring individual queue in sidekiq

Monitoring individual queue in sidekiq

Why aren't you using binstubs yet?

Why aren't you using binstubs yet?

Offline Mode Of Android Apps

Offline Mode Of Android Apps

My upcoming talk in DroidConUK

My upcoming talk in DroidConUK

Integrating Sherlock with android apps

Integrating Sherlock with android apps

Why your android application needs awareness api

Why your android application needs awareness api

Java custom annotations

Java custom annotations

Prevent push on red build with the help of gocd_pre_push

Prevent push on red build with the help of gocd_pre_push

Conway's Game Of Life

Conway's Game Of Life

Notify when android device network status changes

Notify when android device network status changes

Observer Design Pattern

Observer Design Pattern

Filter Design Pattern

Filter Design Pattern

Ruby gem to fetch information from gocd as rich models

Ruby gem to fetch information from gocd as rich models

Android Data Binding

Android Data Binding

Android Custom Animations

Android Custom Animations

shell_session_update: command not found

shell_session_update: command not found

Android Draggable View

Android Draggable View

Android UI Design And Styling

Android UI Design And Styling

GIT revert multiple commits

GIT revert multiple commits

apkToJava - Gem to convert apk file to java code

apkToJava - Gem to convert apk file to java code

Android Padding vs Margin

Android Padding vs Margin

Android UI for beginners

Android UI for beginners

Decorator Design Pattern

Decorator Design Pattern

Junit Rules Vs Setup and TearDown

Junit Rules Vs Setup and TearDown

Android Build Process

Android Build Process

What happens when android screen rotates?

What happens when android screen rotates?

Is ruby monkey patching evil?

Is ruby monkey patching evil?

Android Instrumentation Testing Using Espresso

Android Instrumentation Testing Using Espresso

Testing Android Database

Testing Android Database

MVP in android

MVP in android

Gradient color in android

Gradient color in android

Tool to execute commands in multiple directories

Tool to execute commands in multiple directories

Writing a new programming language

Writing a new programming language

Print custom messages after executing git commands

Print custom messages after executing git commands

Cool tips for vim users

Cool tips for vim users

Schedule local notification in android

Schedule local notification in android

Add album cover to mp3 file

Add album cover to mp3 file

MediaMagic: Convert any media file into encoded string or vice-versa

MediaMagic: Convert any media file into encoded string or vice-versa

Closure in Ruby

Closure in Ruby

Android with sqlite database

Android with sqlite database

Basic configuration of VIM

Basic configuration of VIM

nokogiri ERROR Failed to build gem native extension on MAC

nokogiri ERROR Failed to build gem native extension on MAC

Cucumber and calabash for android app testing

Cucumber and calabash for android app testing

Vim modes - normal, insert and visual

Vim modes - normal, insert and visual

Set up automation using cucumber and capybara

Set up automation using cucumber and capybara

Instrumentation testing of list view

Instrumentation testing of list view