Implementing a timeout for network request - devrath/KotlinAlchemy GitHub Wiki

  • This use case uses the suspending function withTimeout() from the coroutines-core library.
  • It throws a TimeoutCancellationException if the timeout was exceeded.
  • You can set the duration of the request in the UI and check the behavior when the response time is bigger than the timeout.
class NetworkRequestWithTimeoutViewModel(
    private val api: MockApi = mockApi()
) : BaseViewModel<UiState>() {

    fun performNetworkRequest(timeout: Long) {
        uiState.value = UiState.Loading
        // usingWithTimeout(timeout)
        usingWithTimeoutOrNull(timeout)
    }

    private fun usingWithTimeout(timeout: Long) {
        viewModelScope.launch {
            try {
                val recentVersions = withTimeout(timeout) {
                    api.getRecentAndroidVersions()
                }
                uiState.value = UiState.Success(recentVersions)
            } catch (timeoutCancellationException: TimeoutCancellationException) {
                uiState.value = UiState.Error("Network Request timed out!")
            } catch (exception: Exception) {
                uiState.value = UiState.Error("Network Request failed!")
            }
        }
    }

    private fun usingWithTimeoutOrNull(timeout: Long) {
        viewModelScope.launch {
            try {
                val recentVersions = withTimeoutOrNull(timeout) {
                    api.getRecentAndroidVersions()
                }

                if (recentVersions != null) {
                    uiState.value = UiState.Success(recentVersions)
                } else {
                    uiState.value = UiState.Error("Network Request timed out!")
                }
            } catch (exception: Exception) {
                uiState.value = UiState.Error("Network Request failed!")
            }
        }
    }

}

kotlin

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