Streams on Samarthya

Kafka Cluster Fundamentals: Brokers, Topics, and Partitions

Sat, 18 Jan 2025 00:00:00 +0000

I spent a fair amount of time looking at Kafka command output before the vocabulary settled in my head. Once I understood the difference between a broker, a topic, and a partition, the cluster stopped looking like one large mysterious system.

Kafka Streams

Mon, 26 Feb 2024 12:00:00 +0000

In today’s data-driven world, the ability to process information in real-time is crucial. Kafka Streams emerges as a powerful tool for building real-time applications and microservices that leverage the Apache Kafka distributed streaming platform.

Java Stream: Examples

Mon, 26 Apr 2021 09:07:19 +0000

Streams are convenient way to reduce the line of codes, but an understanding them is equally challenging. I write this blog, after realising a desperate attempt at solving a trivial problem just took overwhelming time. (Could be that I am getting old, but never late to learn things again)

Nth Prime

Tue, 15 Dec 2020 08:21:32 +0000

Prime number is an age old problem. I am trying to solve it via streams.

class PrimeCalculator {

 public int nth(int nth) {
 if (nth <= 0)
 throw new IllegalArgumentException();

 // Will skip the nth - 1
 // 2 to n-1
 return IntStream.iterate(2, i -> i + 1).filter(PrimeCalculator::isPrime).skip(nth - 1).findFirst().getAsInt();
 }

 public static boolean isPrime(int x) {
 // till half of x
 return IntStream.rangeClosed(2, (int) (x/2) ).dropWhile(i -> x % i != 0).findFirst().isEmpty();
 }
}

Explanation
#

public int nth(int nth) {
 if (nth <= 0)
 throw new IllegalArgumentException();

 // Will skip the nth - 1
 // 2 to n-1
 return IntStream.iterate(2, i -> i + 1).filter(PrimeCalculator::isPrime).skip(nth - 1).findFirst().getAsInt();
 }

The method nth(int) allows you to return the nth prime starting at 2, 3, 5....

JavaStream: Characters

Fri, 13 Nov 2020 10:20:02 +0000

Continuing from the last blog how about checking a pangram using streams.

public class PangramChecker {

 private String allChars = "abcdefghijklmnopqrstuvwxyz";

 public boolean isPangram(String input) {
 if (input.length() <= 0 || input.isBlank()){
 return false;
 }
 return (allChars.chars().map(x -> (char) x).filter(x -> input.toLowerCase().indexOf(x) >= 0).count() == 26);
 }

}

All the for loops have been squeezed into a simple line

Java Streams

Thu, 12 Nov 2020 11:47:49 +0000

Stream is an new abstraction that lets one process data in a declarative way.

A stream does not store data and, in that sense, is not a data structure. It also never modifies the underlying data source.

The easiest way to learn a new API or a construct is by trying it. So here is an exercise that I tried to learn the Stream API. This is an exercise from exercism.io.