Repository with in-memory cache to support concurrency

AccountRepository.kt

private val lock = Mutex() // #1
private var cachedAccount: Account? = null

suspend fun getAccount(): Account? {
        return cachedAccount ?: mutex.withLock { // #2, #3, #6
            cachedAccount ?: withContext(Dispatchers.IO) { // #4, #5, #6
                val networkModel = ... // perform network query and response parsing
                cachedAccout = networkModel.mapToAccountDomain()
                cachedAccount
        }
    }
}