Coroutine scope is a crucial concept in Kotlin's concurrency model. It defines the lifetime and context for coroutines, ensuring proper management and cancellation of asynchronous operations.
A coroutine scope provides a structured way to launch and manage coroutines. It helps prevent memory leaks and ensures that all child coroutines are cancelled when the scope is cancelled or completed.
Kotlin provides several ways to create a coroutine scope:
suspend fun performTask() = coroutineScope {
launch {
// Child coroutine 1
}
launch {
// Child coroutine 2
}
}
val scope = CoroutineScope(Dispatchers.Default)
scope.launch {
// Coroutine code
}
Coroutine scopes form a hierarchy. When a parent scope is cancelled, all its child coroutines are automatically cancelled. This ensures clean-up and prevents resource leaks.
val job = CoroutineScope(Dispatchers.Default).launch {
val child = launch {
delay(1000)
println("Child coroutine")
}
delay(500)
println("Parent coroutine")
}
job.cancel() // Cancels both parent and child coroutines
GlobalScope
as it can lead to memory leaksCoroutine scopes are particularly useful in:
To deepen your understanding of coroutines, explore these related topics:
By mastering coroutine scopes, you'll be able to write more efficient and manageable asynchronous code in Kotlin.