Implement Retry Logic in Kotlin

This article explores different ways to implement the retry logic in Kotlin.

The idea is to write our code within a try-catch block inside a loop that executes the specified number of times (the maximum retry value). For example, consider the below code:

import kotlin.random.Random

const val MAX_RETRIES = 10

fun main() {

for (i in 0..MAX_RETRIES) {

try {

// generate 0 or 1 with equal probability

val zeroOrOne = Random.nextInt(2)

println("Random number is.. $zeroOrOne")

// 50% probability of "ArithmeticException: / by zero"

val rand = 1 / zeroOrOne

// don't retry on success

break

} catch (e: ArithmeticException) {

// handle exception

println(e.message) // log the exception

// optionally sleep for 1 seconds before retrying

Thread.sleep(1000)

// throw exception if the last re-try fails

if (i == MAX_RETRIES) {

throw e

}

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Output (will vary):

Random number is.. 0
/ by zero
Random number is.. 0
/ by zero
Random number is.. 0
/ by zero
Random number is.. 1

If the code throws an ArithmeticException, the control goes to the catch block. After handling the exception, retry happens after 1 second. The system throws the exception only when all retries are exhausted and the last retry fails.

That’s all about implementing retry logic in Kotlin.

Implement Retry Logic in Kotlin

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