The Hidden Pitfalls of Overusing Design Patterns This is my story of using the Chain of Responsibility pattern after reading about it in a book while preparing for an interview. Yes — I actually used it in a real job. And well, it didn’t turn out the way I had imagined. Before we dive in, here’s a quote from one of my favorite authors, Khaled Hosseini (The Kite Runner): “There is only one sin, only one....

എനിക്ക് പലപ്പോഴും തോന്നിയിട്ടുണ്ട് നമ്മുടെ ഏതു ഭാഷയിലാണ് നമ്മളുടെ ബ്രെയിൻ പ്രവർത്തിക്കുന്നത് എന്ന്. ഇന്റർനെറ്റിൽ പരതുമ്പോൾ നമ്മുക്ക് മനസിലാകും ബ്രെയിൻ symbols ഉം മോഡലുകളും ആണ് ഉപയോഗിക്കുന്നത് എന്ന്. പക്ഷെ ഒരു പ്രോബ്ലം സോൾവ് ചെയ്യുമ്പോൾ നമ്മുടെ ബ്രെയിൻ കൂടുതൽ സമയവും ചിലവഴിക്കുന്നത് ഐഡിയകളെ പരിഭാഷ ചെയ്യാൻ ആയിരിക്കും. പ്രത്യേകിച്ച് മലയാളായി ആയ എനിക്ക് ഇതൊരു പ്രശ്നമായി തോന്നിയിട്ടുണ്. ചില പ്രോബ്ലെംസ് സോൾവ് ചെയ്യുമ്പോൾ എനിക്ക് കൂടുതൽ വഴങ്ങുന്ന ഭാഷ അത് മലയാളം ആണ്. ഉദാഹരണത്തിന് ഈ പ്രോബ്ലം നോക്കൂ. Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining....

Managing Concurrent Updates with Distributed Locks Managing Concurrent Updates with Distributed Locks In distributed systems, managing concurrent access to shared resources is crucial to ensure data consistency and prevent corruption. Let’s explore how to handle this using a Java example, starting with a basic implementation and improving it step-by-step. Basic Implementation Without Proper Lock Handling Here’s a simple version of a method that tries to acquire a distributed lock, perform an update, and release the lock:...

The main problem with me w.r.t DP problem is forgetting it if i don't practice. So I decided to revisit all the DP problems i solved once again just to refresh my memory. So first Lets start with a simple one. Here we go!!! Climbing stairs from Leetcode. Explanation : You are climbing a staircase. It takes n steps to reach the top. Each time you can either climb 1 or 2 steps....

Design patterns are general reusable solutions to common problems that occur in software design. They are not code, but rather guidelines on how to solve a particular problem in a particular context. They are not a finished design that can be transformed directly into code. They are a description or template for how to solve a problem that can be used in many different situations. Types of design patterns in Java -------------------------------- There are three types of design patterns in Java: * Creational...

Today was not an ordinary day for me; it began with the need to take an unexpected sick day. The morning unfolded with urgency as I planned to drop off my child, but fate had a different story in store. Around 9:30 AM, near Hopefarm in Whitefield, my day took a dramatic turn. As I attempted to overtake a car on the right, an elderly man crossing the road appeared in my path....

Jump Game Peak and Valley approach. Jump game is a medium level leetcode problem which is very interesting yet brainy. Once you understand the problem correctly then the answer is obvious. The probelm goes like this according to leetcode. You are given an integer array nums. You are initially positioned at the array’sfirst index, and each element in the array represents your maximum jump length at that position. Return true_ if you can reach the last index, or false otherwise_....

Skewed workloads and Relieving Hot Spots Imagine you have a library with books categorized by their first letter (A-Z). This is like partitioning data based on a key (like the first letter of a book title). Problem: One letter (say, “X”) becomes super popular (a celebrity author!). Everyone wants to read “X” books, causing a “hot spot” (overcrowding) in the “X” section. Hashing doesn’t fix it: Even if you assign different “buckets” based on a hash of the title, all “X” books still end up in the “X” bucket....

Ah, the early days of wrangling massive data tables! I vividly remember the struggle – slow queries, performance bottlenecks, and the ever-growing cloud bill. It was an uphill battle until we unearthed the magic bullet: database partitioning. Talk about a revelation! This newfound approach not only eradicated performance issues but also slashed computational costs. But the story doesn’t end there. My exploration revealed a treasure trove of partitioning techniques, each unlocking unique advantages....

Introduction A colleague recommended Martin Kleppmann’s “Designing Data-Intensive Applications” to me. Initially, I found the beginning somewhat tedious and opted for a non-linear approach, selecting topics of interest at random rather than reading from start to finish as one might with a novel. This strategy seemed fitting given the book’s comprehensive coverage of software system design, akin to an engineering bible. Today, I’ve chosen to delve into the concept of Event Sourcing....