Understanding of RunBlock trap and how we can avoid it?
<p>Certainly, let’s dive deeper into the Kotlin <code>runBlocking</code> deadlock trap with a real-life example. Consider a scenario where you're building a simple Android app with Kotlin that fetches data from a web service using coroutines and Retrofit. You have a <code>ViewModel</code> responsible for making network requests. Here's a simplified example:</p>
<pre>
class MyViewModel : ViewModel() {
private val apiService = ApiService.create()
fun fetchData() {
viewModelScope.launch {
val data = runBlocking {
// This is a blocking operation within runBlocking
apiService.getData()
}
processData(data)
}
}</pre>
<pre>
private fun processData(data: Data) {
// Process the data
}
}</pre>
<p>In this example, <code>runBlocking</code> is used inside the <code>fetchData</code> method to perform a blocking network operation. This code creates a deadlock trap because you're using <code>runBlocking</code> inside a coroutine, and it can potentially block the thread, leading to unresponsiveness in your app.</p>
<p>Here’s how you can avoid this deadlock trap:</p>
<p><strong>Use </strong><code><strong>withContext</strong></code><strong> Instead of </strong><code><strong>runBlocking</strong></code><strong>:</strong> You should avoid using <code>runBlocking</code> in a coroutine. Instead, you can use the <code>withContext</code> function to switch to a different dispatcher (e.g., <code>Dispatchers.IO</code>) for the blocking operation. This way, you don't block the main UI thread.</p>
<p><a href="https://medium.com/@dugguRK/understanding-of-runblock-trap-and-how-we-can-avoid-7b0f31b85dcd"><strong>Click Here</strong></a></p>