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Kotlin Academy · Lesson

Designing Resilient Coroutine Architectures

Combine supervisorScope, retry logic, and handlers for production-grade concurrency.

What Makes Coroutines Resilient?

Resilient coroutine architectures handle failures gracefully: they isolate failures, retry transient errors, cancel stale work, and clean up resources deterministically.

import kotlinx.coroutines.*
// Resilience pillars:
// 1. Failure isolation (SupervisorJob)
// 2. Retry with backoff (retry operator / loop)
// 3. Timeout guards (withTimeout)
// 4. Clean teardown (finally + NonCancellable)
// 5. Observability (CoroutineExceptionHandler)
fun main() = runBlocking { println("Design for failure from the start") }

App-Level Scope Pattern

Create a single app-level CoroutineScope with SupervisorJob + handler. Inject it into services so they all share the same lifecycle.

import kotlinx.coroutines.*
object AppCoroutineScope {
    private val handler = CoroutineExceptionHandler { _, e ->
        println("[AppScope] Uncaught: ${e.message}")
    }
    val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default + handler)
    fun cancel() = scope.cancel()
}

All lessons in this course

  1. SupervisorJob vs Job: Failure Isolation
  2. CoroutineExceptionHandler: Global Uncaught Handler
  3. async/await Exception Propagation
  4. Designing Resilient Coroutine Architectures
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