Created
April 11, 2021 08:43
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Retry Logic for Kotlin and Couroutines
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| package com.cjgaliana.utils | |
| import kotlinx.coroutines.delay | |
| import timber.log.Timber | |
| suspend fun <T> retryWhen( | |
| predicate: (cause: Exception, attempt: Int) -> Boolean, | |
| delayInMilliseconds: Long = 0, | |
| block: suspend () -> T | |
| ): T { | |
| var attemptNumber = 0 | |
| var exception: Exception? = null | |
| do { | |
| try { | |
| return block() | |
| } catch (ex: Exception) { | |
| Timber.e(ex, "Failed attempt $attemptNumber") | |
| exception = ex | |
| attemptNumber++ | |
| if(delayInMilliseconds > 0) { | |
| delay(delayInMilliseconds) | |
| } | |
| } | |
| } while (predicate(exception!!, attemptNumber)) | |
| throw exception | |
| } | |
| suspend fun <T> retry( | |
| maxRetries: Int, | |
| block: () -> T | |
| ): T { | |
| var attemptNumber = 0 | |
| var exception: Throwable? = null | |
| do { | |
| try { | |
| return block() | |
| } catch (ex: Exception) { | |
| Timber.e(ex, "Failed attempt $attemptNumber of $maxRetries") | |
| exception = ex | |
| attemptNumber++ | |
| } | |
| } while (attemptNumber< maxRetries) | |
| throw exception!! | |
| } | |
| // How to use it | |
| suspend fun doSomething() { | |
| val shouldRetry : (cause: Exception, attempt: Int) -> Boolean = { cause, attempt -> | |
| cause is ApolloHttpException && attempt < REQUEST_RETRY_LIMIT | |
| } | |
| retryWhen(shouldRetry) { | |
| // do somehting here that can fail and you want to rety | |
| } | |
| } |
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