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milechainsaw/BackoffCallback.java

Created July 19, 2016 12:53
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  1. milechainsaw created this gist Jul 19, 2016.
    36 changes: 36 additions & 0 deletions BackoffCallback.java
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,36 @@
    /**
    * Created by milechainsaw on 7/19/16.
    *
    * Exponential backoff callback for Retrofit2
    *
    */
    public abstract class BackoffCallback<T> implements Callback<T> {
    private static final int RETRY_COUNT = 3;
    /**
    * Base retry delay for exponential backoff, in Milliseconds
    */
    private static final double RETRY_DELAY = 300;
    private int retryCount = 0;

    @Override
    public void onFailure(final Call<T> call, Throwable t) {
    retryCount++;
    if (retryCount <= RETRY_COUNT) {
    int expDelay = (int) (RETRY_DELAY * Math.pow(2, Math.max(0, retryCount - 1)));
    new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {
    retry(call);
    }
    }, expDelay);
    } else {
    onFailedAfterRetry(t);
    }
    }

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

    public abstract void onFailedAfterRetry(Throwable t);
    }