How to organize the processing of multiple simultaneous requests in the system?

To handle multiple simultaneous requests in Android, multithreading and asynchronous mechanisms are usually used to avoid blocking the main (UI) thread.

Main approaches:

• AsyncTask (deprecated but still used sometimes) — for simple background tasks.
• HandlerThread and Handler — for organizing a background thread with a message queue.
• ExecutorService — for managing a thread pool.
• RxJava — reactive programming for convenient handling of asynchronous operations.
• Coroutines (Kotlin) — modern and convenient way of asynchronous programming.

Example using Kotlin Coroutines for parallel request processing:

import kotlinx.coroutines.*

fun processRequests(requests: List<Request>) {
    CoroutineScope(Dispatchers.IO).launch {
        val jobs = requests.map { request ->
            async {
                handleRequest(request) // function to process a single request
            }
        }
        jobs.awaitAll() // wait for all requests to be processed
    }
}

This approach allows efficient processing of multiple requests simultaneously without blocking the UI and with optimal resource utilization.