Retrying the request using Retrofit 2

Question

How can I add retry functionality to the requests sent by Retrofit 2 library. Something like:

service.listItems().enqueue(new Callback>         


        

Answer 1

ashkan-sarlak answer work great and i'm just try to make it up to date.

From retrofit 2.1

onFailure(Throwable t) 

Change to

onFailure(Call call, Throwable t)

So this make it so easy now.just create CallbackWithRetry.java like this

public abstract class CallbackWithRetry implements Callback {

    private static final int TOTAL_RETRIES = 3;
    private static final String TAG = CallbackWithRetry.class.getSimpleName();
    private int retryCount = 0;

    @Override
    public void onFailure(Call call, Throwable t) {
        Log.e(TAG, t.getLocalizedMessage());
        if (retryCount++ < TOTAL_RETRIES) {
            Log.v(TAG, "Retrying... (" + retryCount + " out of " + TOTAL_RETRIES + ")");
            retry(call);
        }
    }

    private void retry(Call call) {
        call.clone().enqueue(this);
    }
}

That's all! you can simply use it like this

call.enqueue(new CallbackWithRetry() {

        @Override
        public void onResponse(@NonNull Call call, @NonNull retrofit2.Response response) {
            //do what you want
        }
        @Override
        public void onFailure(@NonNull Call call, @NonNull Throwable t) {
            super.onFailure(call,t);
            //do some thing to show ui you trying
            //or don't show! its optional
        }
    });